The　traditional　slurry　preparation　process　is　prone　to　problems　such　as　easy　agglomeration　of　particles　and　poor　dispersion　of　active　materials　and　conductive　agents,　etc.　To　solve　these　problems,　this　study　synthesized　a　nonionic　surface　active　agent　type　dispersant　for　lithium　-ion　batteries　(PEG　-18-C　10　)　by　reacting　glycerol　polyethylene　glycol　ether　(PEG　-18)　and　decanoic　acid,　which　was　used　to　improve　the　LiFePO　4　cathode　slurry　in　lithium　-ion　batteries　and　the　electrochemical　performance,　this　synthesis　method　is　simple,　low　cost　and　easy　to　add.　In　addition,　the　effect　of　the　dosage　of　this　new　dispersant　on　lithium　-ion　batteries　was　investigated.　It　was　found　that　the　dispersion　uniformity　and　rheological　properties　of　the　cathode　slurry　could　be　improved　with　the　addition　of　a　2　%　dispersant　compared　with　the　traditional　cathode　slurry.　Meanwhile,　the　electrochemical　performance　of　the　battery　was　improved,　and　the　specific　capacity　of　the　first　discharge　was　improved　under　the　charging　and　discharging　condition　of　0.2　C,　with　the　specific　capacity　of　the　first　discharge　being　168.5　mA　h/g,　while　that　of　the　unadded　one　was　only　151.1　mA　h/g,　and　the　multiplicity　performance　of　the　battery　was　improved,　with　the　specific　capacity　of　the　discharge　at　5　C　being　118.94　mA　h/g,　as　compared　with　that　of　the　addition　of　the　conventional　dispersant.