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学者姓名：刘慧勇
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Abstract ：
Lithium ion batteries play an important role in various energy storage technologies due to their good safety performance. As an anode material, silicon has attracted attention for its higher theoretical capacity than commercial graphite. But large volume expansion and unstable solid electrolyte interface (SEI) during the cycling of silicon lead to rapid capacity decay, which limits the commercial application of silicon anode. In this article, Si/BiPO4 anode materials were prepared by solvothermal reaction. After morphology analysis and constant current charge discharge cycle analysis of Si/BiPO4 anode materials with different mass ratios, it was found that Si/BiPO4 anode materials with the mass ratio of 7:3 exhibited more excellent electrochemical performance. The conversion reaction of BiPO4 and Li generates Bi and Li3PO4, and the alloying reaction of Bi generates Li3Bi. Bi and Li3Bi reduce the internal resistance of the Si/BiPO4 composite, and Li3PO4 is distributed on the surface of Si material, participating in the formation of SEI film and improving the stability of the material. At a current density of 500 mA g(-1), the first discharge specific capacity of the Si/BiPO4 anode is 2672.1 mA h g(-1). After 200 cycles, the discharge specific capacity remains at 1308.9 mA h g(-1). The electrochemical impedances of pure Si and Si/BiPO4 anode materials before and after cycling were analyzed. It was found that the resistance of the Si/BiPO4 anode before and after 100 cycles was lower than that of pure Si materials, which further proved that the addition of BiPO4 material helps to improve the charge transfer ability of pure silicon materials.
Keyword ：
Anode material Anode material BiPO4 nanoparticles BiPO4 nanoparticles Composite material Composite material Lithium-ion battery Lithium-ion battery
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| GB/T 7714 | Zhang, Yijin , Deng, Qingsong , Zhang, Yong et al. Si/BiPO4 composite anode material for lithium ion batteries prepared by solvothermal method [J]. | CERAMICS INTERNATIONAL , 2024 , 50 (14) : 25192-25201 . |
| MLA | Zhang, Yijin et al. "Si/BiPO4 composite anode material for lithium ion batteries prepared by solvothermal method" . | CERAMICS INTERNATIONAL 50 . 14 (2024) : 25192-25201 . |
| APA | Zhang, Yijin , Deng, Qingsong , Zhang, Yong , Lin, Rongying , Liu, Huiyong . Si/BiPO4 composite anode material for lithium ion batteries prepared by solvothermal method . | CERAMICS INTERNATIONAL , 2024 , 50 (14) , 25192-25201 . |
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本发明公开了一种沉锂母液冷冻除芒硝回收碳酸锂的方法，包括以下步骤：1.闪蒸降温、2.碳化冷冻析晶、3.热解析锂。本发明的有益效果为 : 通过向沉锂母液中加入二氧化碳与硫酸钠，使沉锂母液中的碳酸根离子碳化后确保闪蒸与冷冻过程中由于溶液中锂浓度提高导致形成碳酸锂沉淀造成锂离子损失的现象不会发生，而且回收碳酸锂的过程仅加入了廉价的二氧化碳，回收碳酸锂过程成本低，过程简单，经济效益可观，适合工业生产。
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| GB/T 7714 | 旷戈 , 刘粤 , 李延鹤 et al. 一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法 : CN202111344132.2[P]. | 2021-11-15 00:00:00 . |
| MLA | 旷戈 et al. "一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法" : CN202111344132.2. | 2021-11-15 00:00:00 . |
| APA | 旷戈 , 刘粤 , 李延鹤 , 姜昀 , 郑芳妍 , 刘慧勇 . 一种沉锂母液碳化冷冻除芒硝回收碳酸锂的方法 : CN202111344132.2. | 2021-11-15 00:00:00 . |
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本发明公开了一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法，包括以下步骤：先将硫酸锂溶液、硫酸与偏铝酸钠浆料混合搅拌沉锂，过滤得到滤渣和滤液；再将滤渣加水配浆，并将浆液加入碳化反应槽，通入CO2气体反应，过滤得到氢氧化铝和碳酸氢锂溶液；然后将碳酸氢锂溶液进行热解获得高纯碳酸锂。本发明将硫酸锂溶液加入到铝酸钠溶液中，使Li+与Al(OH)4−反应生成LiXA1Y(OH)(3Y+X)∙nH2O复盐沉淀，进行沉锂，再经过碳化工艺除去不溶杂质、氢氧化铝、钠、硫酸根等，得到高纯级碳酸锂，不需离子交换，原料消耗少且来源广，滤渣循环利用，成本低廉，具有成本与技术经济优势。
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| GB/T 7714 | 旷戈 , 姜昀 , 刘粤 et al. 一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法 : CN202111427276.4[P]. | 2021-11-29 00:00:00 . |
| MLA | 旷戈 et al. "一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法" : CN202111427276.4. | 2021-11-29 00:00:00 . |
| APA | 旷戈 , 姜昀 , 刘粤 , 郑芳妍 , 李延鹤 , 刘慧勇 . 一种硫酸锂溶液吸附碳化制备高纯碳酸锂的方法 : CN202111427276.4. | 2021-11-29 00:00:00 . |
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本发明公开了一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法，包括步骤：1)将粗制碳酸锂加水除去可溶盐，分离的固体与水、生石灰搅拌反应，固液分离得到氢氧化锂溶液；2)浓缩；3)浓缩液中加入除杂剂搅拌反应，固液分离得到精制液；4)一部分精制液吸收二氧化碳碳化后过滤，获得碳酸氢锂溶液；5)碳酸氢锂溶液与另一部分精制液混合反应，得到高纯级碳酸锂。本发明将传统的氢氧化锂吸收二氧化碳的碳化沉锂的气—液反应过程转化成了液—液反应，可增大溶液中杂质的容忍度，结晶温和，易于控制产品纯度和粒度，不易形成杂质的包裹，减少了洗涤工序，省去了离子交换和碳酸氢锂热解的工序，使投资费用和蒸发负荷大大降低，能够实现较大利润。
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| GB/T 7714 | 旷戈 , 姜昀 , 郑芳妍 et al. 一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法 : CN202111561905.2[P]. | 2021-12-20 00:00:00 . |
| MLA | 旷戈 et al. "一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法" : CN202111561905.2. | 2021-12-20 00:00:00 . |
| APA | 旷戈 , 姜昀 , 郑芳妍 , 刘粤 , 李延鹤 , 刘慧勇 . 一种粗制碳酸锂石灰苛化碳化生产高纯碳酸锂的方法 : CN202111561905.2. | 2021-12-20 00:00:00 . |
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To buffer the volume expansion of silicon during charge-discharge process, a 3D carbon-coated stable silicon/graphene/CNT (C@Si/GN/CNT/PDA-C) composite was prepared. Si nanoparticles (SiNPs) were first modified by hexadecyl trimethyl ammonium bromide (CTAB) to enhance their stability and dispersibility in water, then uniformly distributed in graphene/carbon nanotubes (GN/CNT) by electrostatic self-assembly, and ultimately encapsulated by carbonized poly-dopamine carbon layer (PDA-C) at high temperature. PDA-C not only alleviates the volume expansion of Si and inhibits the direct contact of Si with electrolyte, but also acts as a bridge between the conductive GN/CNT and Si to maintain electrode integrity. As an anode material for lithium-ion batteries, the C@Si/GN/CNT/PDA-C exhibits a superior reversible capacity of 1946 mAh g(-1) after 100 cycles with the capacity retention of 68.9% at a current density of 0.1 A g(-1) , and over 1306 mAh g(-1) after 100 cycles at 1 A g(-1). The excellent electrochemical performance of C@Si/GN/CNT/PDA-C is attributed to the stable hierarchical structure. (C) 2021 Published by Elsevier Ltd.
Keyword ：
Anode material Anode material GN/CNT GN/CNT Lithium ion battery Lithium ion battery Poly-dopamine Poly-dopamine Silicon Silicon
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| GB/T 7714 | Wang, Fangfang , Lin, Song , Lu, Xuesong et al. Poly-dopamine carbon-coated stable silicon/graphene/CNT composite as anode for lithium ion batteries [J]. | ELECTROCHIMICA ACTA , 2022 , 404 . |
| MLA | Wang, Fangfang et al. "Poly-dopamine carbon-coated stable silicon/graphene/CNT composite as anode for lithium ion batteries" . | ELECTROCHIMICA ACTA 404 (2022) . |
| APA | Wang, Fangfang , Lin, Song , Lu, Xuesong , Hong, Ruoyu , Liu, Huiyong . Poly-dopamine carbon-coated stable silicon/graphene/CNT composite as anode for lithium ion batteries . | ELECTROCHIMICA ACTA , 2022 , 404 . |
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The production of aluminium oxide from coal flay ash, an aluminum-rich and silicate-based solid waste, has been found uneconomic, particularly due to the great challenge for impurity removal. The present study proposes a new process to recover aluminum oxide from coal fly ash using pressure leaching with sulfuric acid, followed by crystallization and pyrolysis of potassium-alum. The thermodynamic and experimental analyses results show the feasibility of obtaining metallurgical-grade aluminum oxide using the new process, with low reagent and energy consumption. In the process, the separation of aluminum from the complicated sulfate leachate can be achieved efficiently. The excess sulfuric acid, potassium sulfate and oxy-sulfide (obtained from pyrolysis) can all be recycled for reused. The comparisons between the new process and the traditional Bayer process indicate that the new process for aluminum oxide production from aluminum-rich and silicate-based materials has a wide application. © 2022, China Science Publishing & Media Ltd. All right reserved.
Keyword ：
Alumina Alumina Aluminum oxide Aluminum oxide Aluminum sulfate Aluminum sulfate Coal Coal Coal ash Coal ash Energy utilization Energy utilization Fly ash Fly ash Potash Potash Pyrolysis Pyrolysis Sulfur compounds Sulfur compounds Sulfuric acid Sulfuric acid
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| GB/T 7714 | Wang, Peng , Liu, Hui-Yong , Huang, Hai et al. Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum [J]. | Chinese Journal of Nonferrous Metals , 2022 , 32 (2) : 509-519 . |
| MLA | Wang, Peng et al. "Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum" . | Chinese Journal of Nonferrous Metals 32 . 2 (2022) : 509-519 . |
| APA | Wang, Peng , Liu, Hui-Yong , Huang, Hai , Kuang, Ge , Li, Huan . Production of aluminum oxide from coal fly ash by acidic method based on crystallization and pyrolysis of potassium-alum . | Chinese Journal of Nonferrous Metals , 2022 , 32 (2) , 509-519 . |
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Conductive hydrogels have found large application prospects in the fabrication of flexible multifunctional electronic devices for future-generation wearable human-machine interactions. However, their inferior mechanical strength, low-temperature resistance, and non-recyclability, resulting in the waste of resources, severely hinder their application. Thus, starch bio-based hydrogels have attracted significant attention. Starch is the most abundantly available biodegradable biopolymer. However, starch bio-based hydrogels usually show low toughness, high brittleness and low anti-freezing properties. Thus, to address these issues, herein, glycerol and CaCl2 were concurrently introduced to a starch/poly(vinyl alcohol) (PVA) hydrogel to improve its mechanical, thermal and conductive properties. The effect of glycerol and CaCl2 on the crystallinity, mechanical, thermal and conductive properties was revealed by X-ray diffraction, tensile testing, differential scanning calorimetry, and electrochemical impedance spectroscopy. The thermoplasticity and healing properties of the starch/PVA/glycerol/CaCl2 organohydrogel was also evaluated. Due to the role of glycerol and CaCl2, the compatibility between starch and PVA improved, and thus the as-prepared organohydrogels showed favorable mechanical flexibility and demonstrated anti-freezing ability and long-term stability at ambient temperature. Besides, the abundant hydrogen bonds formed among PVA, starch, glycerol and water endowed the organohydrogels with high stretchability (>790%) and good thermoplasticity. Finally, based on the starch/PVA/glycerol/CaCl2 organohydrogel, a flexible all-solid-state supercapacitor and strain sensor were assembled and their performances were measured. The supercapacitor displayed an areal specific capacitance of 107.2 mF cm(-2) at 1 mA cm(-2). Moreover, the strain sensor demonstrated high sensitivity (gauge factor of 3.422) and could be directly attached to the human body to detect motion.
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| GB/T 7714 | Lu, Jing , Gu, Jianfeng , Hu, Oudong et al. Highly tough, freezing-tolerant, healable and thermoplastic starch/poly(vinyl alcohol) organohydrogels for flexible electronic devices [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (34) : 18406-18420 . |
| MLA | Lu, Jing et al. "Highly tough, freezing-tolerant, healable and thermoplastic starch/poly(vinyl alcohol) organohydrogels for flexible electronic devices" . | JOURNAL OF MATERIALS CHEMISTRY A 9 . 34 (2021) : 18406-18420 . |
| APA | Lu, Jing , Gu, Jianfeng , Hu, Oudong , Fu, Yunhan , Ye, Dezhan , Zhang, Xi et al. Highly tough, freezing-tolerant, healable and thermoplastic starch/poly(vinyl alcohol) organohydrogels for flexible electronic devices . | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (34) , 18406-18420 . |
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Intelligent flexible sensors that are comfortable to wear and have self-powered properties are primary candidates for next-generation wearable electronics. Nevertheless, most current flexible sensors cannot work independently, they have to rely on external power. Herein, we report a flexible sensing device that is able to reliably and stably monitor human motion with successive self-powering. The device consists of a supercapacitor as a power source and a strain sensor. An ionic hydrogel was used either as the electrolyte for the supercapacitor or as the functional element for the sensor. Thanks to the superior electromechanical and electrochemical properties of the hydrogel, when used as the electrolyte, the supercapacitor delivers over a wide voltage window (0-2.5 V), and exhibits superior energy density (81.46 mW h cm(-2)), and power density (2500 mW cm(-2)). The ionic hydrogel electrolyte also exhibits environmental durability and strain-resistance, demonstrating its reliability under deformation. Strain sensors based on such ionic organohydrogels operate over a wide working range (0-1000%), with high sensitivity (gauge factor = 6.04), and durability. Such a compact wearable sensing system presents potential applications in health monitoring by detecting motion precisely and rapidly. When machine learning is combined into a wearable sensing system, the intelligent device offers new prospects for tackling challenges in wearable electronics.
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| GB/T 7714 | Huang, Jianren , Gu, Jianfeng , Liu, Jiantao et al. Environment stable ionic organohydrogel as a self-powered integrated system for wearable electronics [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (30) : 16345-16358 . |
| MLA | Huang, Jianren et al. "Environment stable ionic organohydrogel as a self-powered integrated system for wearable electronics" . | JOURNAL OF MATERIALS CHEMISTRY A 9 . 30 (2021) : 16345-16358 . |
| APA | Huang, Jianren , Gu, Jianfeng , Liu, Jiantao , Guo, Jinquan , Liu, Huiyong , Hou, Kun et al. Environment stable ionic organohydrogel as a self-powered integrated system for wearable electronics . | JOURNAL OF MATERIALS CHEMISTRY A , 2021 , 9 (30) , 16345-16358 . |
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The high-nickel cathode material of LiNi0.8Co0.15Al0.05O2 (LNCA) has a prospective application for lithium-ion batteries due to the high capacity and low cost. However, the side reaction between the electrolyte and the electrode seriously affects the cycling stability of lithium-ion batteries. In this work, Ni2+ preoxidation and the optimization of calcination temperature were carried out to reduce the cation mixing of LNCA, and solid-phase Al-doping improved the uniformity of element distribution and the orderliness of the layered structure. In addition, the surface of LNCA was homogeneously modified with ZnO coating by a facile wet-chemical route. Compared to the pristine LNCA, the optimized ZnO-coated LNCA showed excellent electrochemical performance with the first discharge-specific capacity of 187.5mA h g(-1]), and the capacity retention of 91.3% at 0.2C after 100 cycles. The experiment demonstrated that the improved electrochemical performance of ZnO-coated LNCA is assigned to the surface coating of ZnO which protects LNCA from being corroded by the electrolyte during cycling.
Keyword ：
cathode material cathode material LiNi0.8Co0.15Al0.05O2 LiNi0.8Co0.15Al0.05O2 lithium-ion battery lithium-ion battery ZnO coating ZnO coating
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| GB/T 7714 | Wang, Fangfang , Hong, Ruoyu , Lu, Xuesong et al. Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating [J]. | NANOTECHNOLOGY REVIEWS , 2021 , 10 (1) : 210-220 . |
| MLA | Wang, Fangfang et al. "Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating" . | NANOTECHNOLOGY REVIEWS 10 . 1 (2021) : 210-220 . |
| APA | Wang, Fangfang , Hong, Ruoyu , Lu, Xuesong , Liu, Huiyong , Zhu, Yuan , Zheng, Ying et al. Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating . | NANOTECHNOLOGY REVIEWS , 2021 , 10 (1) , 210-220 . |
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Coal fly ash, commonly produced from thermal power plants, is not only an industrial waste but an aluminum-rich resource that needs to be disposed of properly. This study aims to extract aluminum from coal fly ash using pressurized sulfuric acid (H2SO4) leaching and to investigate the dissolution mechanism during the leaching process. The effects of initial concentration of H2SO4, reaction temperature and time on the extraction of aluminum were investigated. Under optimized conditions (3 mol/l H2SO4, 220 degrees C and 180 min), the extraction of aluminum reached 82.51%. It was found that mullite (3Al(2)O(3)center dot 2SiO(2)) contained in coal fly ash was completely dissolved during the leaching, while the dissolution of silica-alumina glass beads was at a limited degree. The un-leached aluminum was found to be locked inside the glass beads which H2SO4 was unable to access.
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| GB/T 7714 | Wang, Peng , Liu, Huiyong , Zheng, Fangyan et al. Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism [J]. | JOM , 2021 , 73 (9) : 2643-2651 . |
| MLA | Wang, Peng et al. "Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism" . | JOM 73 . 9 (2021) : 2643-2651 . |
| APA | Wang, Peng , Liu, Huiyong , Zheng, Fangyan , Liu, Yue , Kuang, Ge , Deng, Rongdong et al. Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism . | JOM , 2021 , 73 (9) , 2643-2651 . |
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