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学者姓名：洪若瑜
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Abstract ：
The practical application of graphite cathodes in aluminum ion batteries (AIBs) is hindered by poor cycle and rate performance of graphite, due to serious structural degradation. In this work, different types of kish-expanded graphite (KEG) with different expansion volumes were prepared simply and rapidly using low-cost solid waste kish graphite (KG) as precursor, and K2S2O8 and concentrated H2SO4 as oxide intercalation agents by spaceconfined intercalation expansion strategy. By adjusting the mass ratio of K2S2O8 to KG, the macrostructure and microstructure of KEG can be effectively controlled. Specifically, KEG6, synthesized with the mass ratio of K2S2O8 to KG of 6, exhibited a large expansion volume, graphene nanosheets with numerous graphite microcrystalline layer structures, and micro-nano interlayer pore structures resulting from the cross-linking of graphene nanosheets, along with abundant oxygen-containing functional groups. KEG6, as a cathode material for AIBs, exhibited outstanding electrochemical performance, including superior specific capacity (141.1 mA h/g at 50 mA/g), good rate capability (119.8 mA h/g at 1000 mA/g, 85.6 mA h/g at 2000 mA/g) and remarkable cycle stability (134.0 mA h/g with 99.1% Coulombic efficiency after 10,000 cycles at 1000 mA/g). This study provides a simple and rapid method for the large-scale synthesis of KEG as a potential candidate for AIBs.
Keyword ：
Aluminum ion batteries Aluminum ion batteries Cathode Cathode Electrochemical performances Electrochemical performances Kish-based expanded graphite Kish-based expanded graphite
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| GB/T 7714 | Wang, Zhenshuai , Zhang, Dai , Bao, Xingyang et al. Space-confined intercalation expansion strategy for simple and rapid synthesis of kish-based expanded graphite for aluminum ion batteries [J]. | CARBON , 2024 , 223 . |
| MLA | Wang, Zhenshuai et al. "Space-confined intercalation expansion strategy for simple and rapid synthesis of kish-based expanded graphite for aluminum ion batteries" . | CARBON 223 (2024) . |
| APA | Wang, Zhenshuai , Zhang, Dai , Bao, Xingyang , Hong, Ruoyu , Xu, Ying , Xu, Jinjia et al. Space-confined intercalation expansion strategy for simple and rapid synthesis of kish-based expanded graphite for aluminum ion batteries . | CARBON , 2024 , 223 . |
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As multivalent ion batteries, aluminum ion batteries (AIBs) have broad application prospects. In addition, with the further development of new electrolytes, deep eutectic electrolytes are expected to become a green, inexpensive, safe, and ideal electrolytic liquid system to replace traditional ionic liquid electrolytic systems commonly used in AIBs. Herein, we prepared an AlCl3-acetamide (AcAm) electrolyte and systematically analyzed its ion transport capacity at different molar ratios of its components. Consequently, a compositional ratio of 1 : 1.4 of AcAm : AlCl3 provided the best ion transport capacity, exhibiting an exceptional electrochemical performance with high reversible capacity, excellent rate performance, and excellent cycling performance. The graphite material in the electrolytic liquid system showed a typical charge storage mechanism dominated by diffusion-controlled processes, indicating that the charge storage behavior of the graphite electrode in this type of electrolyte battery is dependent on ion intercalation. Additionally, the main structure of the graphite material showed little to no change during a long electrochemical test cycle, suggesting its high structural stability. This research shows that the amide electrolyte has great potential for electrochemical application and broad application prospect.
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| GB/T 7714 | Bao, Xingyang , Wang, Zhenshuai , Zhang, Dai et al. A deep eutectic electrolyte of AlCl3-acetamide for rechargeable aluminum-ion batteries [J]. | NEW JOURNAL OF CHEMISTRY , 2024 , 48 (13) : 5893-5901 . |
| MLA | Bao, Xingyang et al. "A deep eutectic electrolyte of AlCl3-acetamide for rechargeable aluminum-ion batteries" . | NEW JOURNAL OF CHEMISTRY 48 . 13 (2024) : 5893-5901 . |
| APA | Bao, Xingyang , Wang, Zhenshuai , Zhang, Dai , Hong, Ruoyu , Li, Minglin , Smith, Campion M. et al. A deep eutectic electrolyte of AlCl3-acetamide for rechargeable aluminum-ion batteries . | NEW JOURNAL OF CHEMISTRY , 2024 , 48 (13) , 5893-5901 . |
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The LiFePO4 cathode material possesses a low diffusion coefficient and exhibits poor electronic conductivity, respectively due to its uniaxial ion channel and inherent semiconductor properties. To address these limitations, Co and Nb doping emerges as a vital solution owing to their similar ionic radii and stable valence states. In this study, density functional theory (DFT) is employed to investigate the impact of Co and Nb doping on the electrochemical and mechanical properties of LiFePO4. The results reveal that the dopants lead to an expansion in the lattice constant of LiFePO4. Furthermore, doping brings about a significant reduction in the volume change rate (0.3% for Co doping and 1% for Nb doping), resulting in enhanced transmission of lithium ions. Specifically, Co and Nb doping elevate the lithium removal voltage of LiFePO4 from 3.44 to 3.96 V and 3.8 V, respectively. Furthermore, these doping processes enhance the material's mechanical properties. It is worth noting that the doping of Co and Nb reduces the migration barrier and increases the diffusion rate of lithium ions. It is observed that the proximity to the doped ion increases the energy barrier, whereas moving away from the doped ion decreases the energy barrier, emphasizing the significant influence of dopant ions on the local energy barrier. Additionally, after doping, the operating voltage of the battery experiences a significant increase. Overall, the selected elements in this study demonstrate promising potential to enhance the performance of LiFePO4 cathode materials, offering encouraging prospects for future advancements in battery technology.
Keyword ：
Discharge rate Discharge rate First-principles First-principles LiFePO4 LiFePO4 Lithium removal voltage Lithium removal voltage Transition state Transition state
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| GB/T 7714 | Lv, Zhi , Li, Minglin , Yang, Hai et al. The first-principles study on electrochemical performance, mechanical properties, and lithium-ion migration of LiFePO4 modified by doping with Co and Nb [J]. | JOURNAL OF SOLID STATE ELECTROCHEMISTRY , 2024 , 28 (8) : 2873-2883 . |
| MLA | Lv, Zhi et al. "The first-principles study on electrochemical performance, mechanical properties, and lithium-ion migration of LiFePO4 modified by doping with Co and Nb" . | JOURNAL OF SOLID STATE ELECTROCHEMISTRY 28 . 8 (2024) : 2873-2883 . |
| APA | Lv, Zhi , Li, Minglin , Yang, Hai , Lin, Junxiong , Luo, Jing , Hong, Ruoyu et al. The first-principles study on electrochemical performance, mechanical properties, and lithium-ion migration of LiFePO4 modified by doping with Co and Nb . | JOURNAL OF SOLID STATE ELECTROCHEMISTRY , 2024 , 28 (8) , 2873-2883 . |
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采用分子动力学模拟方法，构建双层石墨烯旋转摩擦的原子模型，研究缺陷类型、浓度、尺寸效应、石墨烯堆叠方式等因素对其层间旋转摩擦特性的影响，并探讨应变工程的减摩效应.实验结果表明，缺陷类型和堆叠方式对石墨烯旋转摩擦特性的影响较为显著，缺陷类型的影响程度最高.当对底层石墨烯引入拉伸应变后，其旋转摩擦阻力发生衰减，且单空位缺陷与无缺陷模型的力矩递减趋势最为相似.对比研究底层石墨烯的压缩应变，发现其在一定范围内使得层间摩擦增大.本研究有助于缺陷石墨烯层间旋转摩擦特性理论的进一步完善.
Keyword ：
分子动力学 分子动力学 拉伸应变 拉伸应变 旋转摩擦 旋转摩擦 正交试验设计 正交试验设计 缺陷石墨烯 缺陷石墨烯
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| GB/T 7714 | 李明林 , 王攀 , 洪若瑜 . 不同缺陷类型双层石墨烯旋转摩擦特性 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 276-283 . |
| MLA | 李明林 et al. "不同缺陷类型双层石墨烯旋转摩擦特性" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 276-283 . |
| APA | 李明林 , 王攀 , 洪若瑜 . 不同缺陷类型双层石墨烯旋转摩擦特性 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 276-283 . |
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Nowadays, the energy supply market for commercial electrical vehicles and mobiles is highly dominated by Li-ion batteries (LIBs). The layered Li-rich (LLR) oxide MNC (Mn, Ni, and Co)-based cathode is a promising material for next-generation LIBs due to its high energy and power density, cost-effectiveness, and eco-friendliness. However, LLR material's micrometer-size particles can lead to intergranular cracks during electrochemical cycling at high voltages, resulting in a thick solid electrolyte interphase. Along with this, structural fluctuations, particle agglomeration and non-uniform particles, oxygen loss in initial cycling, Mn dissolution, irreversible cation migration, high internal resistance, and corrosion contribute to issues like low charge-discharge capacities, voltage fade, irreversible capacity loss, poor Coulombic efficiency, and limited rate capability, degrading the electrochemical performance of the LLR cathode. Fortunately, the nanomaterials (NMs) coating, including oxides, phosphates, fluorides, carbon compounds, and polymers, offers solutions through core/shell strategies composed of LLR core and nanoscale shell. This article delves into NM coating advantages and methods for achieving uniform, homogeneous, and ultrathin nanocoatings (less than 40 nm thickness). Additionally, incorporating the ultrathin spinel layer and oxygen vacancies can further enhance the electrochemical activity.
Keyword ：
Li-ion battery Li-ion battery Li-rich cathode material Li-rich cathode material nanomaterial coatings nanomaterial coatings
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| GB/T 7714 | Bhosale, Sanjana S. , Sun, Zhineng , Hong, Ruoyu . Nanomaterial coating for layered lithium rich transition metal oxide cathode for lithium-ion battery [J]. | NANOTECHNOLOGY REVIEWS , 2024 , 13 (1) . |
| MLA | Bhosale, Sanjana S. et al. "Nanomaterial coating for layered lithium rich transition metal oxide cathode for lithium-ion battery" . | NANOTECHNOLOGY REVIEWS 13 . 1 (2024) . |
| APA | Bhosale, Sanjana S. , Sun, Zhineng , Hong, Ruoyu . Nanomaterial coating for layered lithium rich transition metal oxide cathode for lithium-ion battery . | NANOTECHNOLOGY REVIEWS , 2024 , 13 (1) . |
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The recovery of spent graphite (SG) from lithium-ion batteries (LIBs) has been neglected due to its relatively low value and the lack of effective recovery methods. In this study, a green and cost-effective water washing process was used to recycle the spent graphite of LIBs anode, and the recovered graphite (RG) was used as the cathode material of aluminum ion batteries (AIBs). The RG retained the integrated graphite structure after the water washing process, showing a slightly enlarged interlayer spacing. When used as a cathode material for AIBs, it exhibits better electrochemical performance than commercial artificial graphite. At a current density of 50 mA g−1, the RG shows a high specific capacity of 95.2 mAh g−1. At a high current density of 2000 mA g−1, the specific capacity still maintains 51 mAh g−1, demonstrating excellent rate performance. Meanwhile, the average specific capacity of 72.5 mAh g−1 was steadily cycled for 10,000 cycles at a current density of 1000 mA g−1, showing excellent cycle performance. This work provides a novel approach to the high-value-added application of spent graphite from lithium batteries and a development of high-performance graphite cathode materials for AIBs. © 2024
Keyword ：
Aluminum ion batteries Aluminum ion batteries pent graphite pent graphite Recovered graphite Recovered graphite Water washing Water washing
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| GB/T 7714 | Zhang, D. , Wang, Z. , Bao, X. et al. A green and low-cost approach to recover graphite for high-performance aluminum ion battery cathode [J]. | Materials Today Sustainability , 2024 , 28 . |
| MLA | Zhang, D. et al. "A green and low-cost approach to recover graphite for high-performance aluminum ion battery cathode" . | Materials Today Sustainability 28 (2024) . |
| APA | Zhang, D. , Wang, Z. , Bao, X. , Hong, R. , Zhang, X. , Xu, J. . A green and low-cost approach to recover graphite for high-performance aluminum ion battery cathode . | Materials Today Sustainability , 2024 , 28 . |
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The rotating arc plasma method, based on its unique characteristics, provides a simple, efficient, and catalyst-free approach for graphene material synthesis. This study employs molecular dynamics simulations to theoretically investigate the detailed growth process of graphene at the atomic scale using plasma. During the growth process, different radicals serve as dissociation precursors within the plasma. Simulation results indicate that the growth process of graphene clusters involves three stages: extension of carbon clusters, cyclization of carbon chains, and coalescence of clusters into sheets. Firstly, the precursor concentration affects the size of graphene clusters; increasing the precursor concentration enlarges the cluster size but also increases the likelihood of curling. Secondly, increasing the hydrogen content in the precursor can reduce the growth rate of clusters, decrease dangling bonds at the periphery of clusters, thereby slowing down cluster closure and maintaining a well-defined sheet structure. Lastly, appropriately elevating the simulation temperature can enhance the reaction rate during the simulation process without altering the reaction pathway. These research findings establish the foundation for understanding the growth mechanism of graphene. © 2024 Elsevier Inc.
Keyword ：
Graphene Graphene Molecular dynamics Molecular dynamics Plasma Plasma RDF analysis RDF analysis
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| GB/T 7714 | Dong, C. , Li, M. , Huang, Y. et al. Molecular dynamics simulation study of graphene synthesis by rotating arc plasma [J]. | Journal of Molecular Graphics and Modelling , 2024 , 133 . |
| MLA | Dong, C. et al. "Molecular dynamics simulation study of graphene synthesis by rotating arc plasma" . | Journal of Molecular Graphics and Modelling 133 (2024) . |
| APA | Dong, C. , Li, M. , Huang, Y. , Yang, H. , Wu, B. , Hong, R. . Molecular dynamics simulation study of graphene synthesis by rotating arc plasma . | Journal of Molecular Graphics and Modelling , 2024 , 133 . |
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Li-rich manganese-based cathode materials are known as one of the most promising cathode materials for next-generation lithium batteries due to their high theoretical specific capacity. However, there are problems such as low specific capacity, poor rate performance, and fast decay rate during cycling. In this paper, spherical lithium-rich manganese-based cathode material Li1.2Mn0.54Ni0.13Co0.13O2 was prepared by co-precipitation method, and aluminum fluoride (AlF3) was prepared by high temperature solid state reaction, so that AlF3 was uniformly coated on lithium-rich manganese-based cathode. The results show that AlF3 is uniformly coated on the surface of the spherical Li1.2Mn0.54Ni0.13Co0.13O2 material with a thickness of about 5 similar to 7 nm, and the material maintains the original layered structure without changing. The charge-discharge cycle test was carried out in the voltage range of 2.0 similar to 4.8 V, and the specific capacity of the Li-rich manganese-based cathode material coated with AlF3 was significantly improved, reaching 283.3 mAh/g (Under the same preparation method and test conditions, this value is in the forefront of the 260-290 mAh/g that can be achieved by most of the current coating methods). The AlF3 coating with the best retention performance is 4 wt% and still has a retention rate of 84.4% after 200 charge-discharge cycles. During the charging and discharging process, AlF3 can maintain the stability of the main cathode material and inhibit the next transformation, thereby ensuring the high specific capacity and cycle stability of the material.
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| GB/T 7714 | Zhang, Jinlong , Zhang, Dai , Wang, Zhenshuai et al. AlF3 coating improves cycle and voltage decay of Li-rich manganese oxides [J]. | JOURNAL OF MATERIALS SCIENCE , 2023 , 58 (10) : 4525-4540 . |
| MLA | Zhang, Jinlong et al. "AlF3 coating improves cycle and voltage decay of Li-rich manganese oxides" . | JOURNAL OF MATERIALS SCIENCE 58 . 10 (2023) : 4525-4540 . |
| APA | Zhang, Jinlong , Zhang, Dai , Wang, Zhenshuai , Zheng, Feng , Zhong, Rui , Hong, Ruoyu . AlF3 coating improves cycle and voltage decay of Li-rich manganese oxides . | JOURNAL OF MATERIALS SCIENCE , 2023 , 58 (10) , 4525-4540 . |
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Nitrogen doping is an effective way to improve the electrical and catalytic properties of graphene. Here, we used a non-thermal plasma technique with AC rotating arc to prepare nitrogen-doped graphene. This method does not need catalyst and can produce nitrogen-doped graphene in the atmospheric environment by large scale. CH4 as the carbon source and N-2 as the nitrogen source, nitrogen-doped graphene was obtained by plasma direct synthesis. The nitrogen content in the product was analyzed by X-ray photoelectron spectroscopy and the doping level was about 1.19 at.%. It was found that H-2 and CO2 as carrier gases can change the nitrogen doping type and content. When there was only N-2, pyrrolic N and graphitic N were the main forms in the graphene. The addition of H-2 improved the selectivity of pyridinic N and pyrrolic N, but decreased the nitrogen doping content. CO2 significantly increased the selectivity of pyrrolic N and increased the nitrogen doping content. In addition, the formation mechanism of nitrogen-doped graphene was briefly described in this paper. The key in this plasma production technology is to understand the effect of carrier gas on nitrogen doping, which is also instructive for mass production in industry.
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| GB/T 7714 | Zhong, Rui , Lu, Xuesong , Zheng, Feng et al. Effect of carrier gas on nitrogen-doped graphene in AC rotating arc plasma [J]. | JOURNAL OF MATERIALS SCIENCE , 2023 , 58 (21) : 8742-8756 . |
| MLA | Zhong, Rui et al. "Effect of carrier gas on nitrogen-doped graphene in AC rotating arc plasma" . | JOURNAL OF MATERIALS SCIENCE 58 . 21 (2023) : 8742-8756 . |
| APA | Zhong, Rui , Lu, Xuesong , Zheng, Feng , Zhang, Jinlong , Hong, Ruoyu . Effect of carrier gas on nitrogen-doped graphene in AC rotating arc plasma . | JOURNAL OF MATERIALS SCIENCE , 2023 , 58 (21) , 8742-8756 . |
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The separation and purification of kish graphite is an important prerequisite for its high value and com-prehensive utilization. The comprehensive separation process including water washing dust removal, magnetic separation and acid leaching purification can effectively enrich and purify kish flake graphite (KFG) from low-cost industrial by-product kish graphite. When the magnetic strength is 2000 Gauss, the purified KFG has suitable recovery (57.34%), high fixed carbon content (99.38%) and low ash content (0.62%). Compared with natural flake graphite, KFG has a highly ordered graphite microcrystalline layer structure with higher graphitization degree (99.77%) and well-developed micro/nanopore with larger specific surface area (4.12 m2 center dot g-1). Such distinctive microstructure features ensure KFG to be applied as a cathode material for aluminum ion batteries (AIBs) to exhibit superior electrochemical behaviors. KFG exhibits a high re-versible specific capacity (110.7 mAh/g at 50 mA/g), outstanding rate capability (56.9 and 26.6 mAh/g at high current densities of 1000 and 2000 mA/g) and superior long-term cycling stability (101.8 mAh/g with a Coulombic efficiency of 99.5% at 1000 mA/g after 2000 cycles). This study demonstrates a promising fea-sibility for mass production of KFG from industrial by-product kish graphite for high performance AIBs. (c) 2023 Elsevier B.V. All rights reserved.
Keyword ：
Aluminum ion batteries Aluminum ion batteries Cathode material Cathode material Kish flake graphite Kish flake graphite Separation and purification Separation and purification
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| GB/T 7714 | Wang, Zhenshuai , Bao, Xingyang , Zhang, Dai et al. Application of purified kish flake graphite as a potential cathode material for high-performance aluminum ion batteries [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 954 . |
| MLA | Wang, Zhenshuai et al. "Application of purified kish flake graphite as a potential cathode material for high-performance aluminum ion batteries" . | JOURNAL OF ALLOYS AND COMPOUNDS 954 (2023) . |
| APA | Wang, Zhenshuai , Bao, Xingyang , Zhang, Dai , Sun, Zhineng , Lu, Xuesong , Hong, Ruoyu . Application of purified kish flake graphite as a potential cathode material for high-performance aluminum ion batteries . | JOURNAL OF ALLOYS AND COMPOUNDS , 2023 , 954 . |
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