A novel three-step approach to separate cathode components for lithium-ion battery recycling  

作　　者：Yun Zhao Ling-Zhe Fang Yu-Qiong Kang Li Wang Yu-Nan Zhou Xin-Yi Liu Tao Li Yan-Xi Li Zheng Liang Zhe-Xu Zhang Bao-Hua Li 

机构地区：[1]Engineering Laboratory for Next Generation Power and Energy Storage Batteries,Graduate School at Shenzhen,Tsinghua University,Shenzhen 518055,China [2]Department of Chemistry and Biochemistry,Northern Illinois University,Dekalb 60115,USA [3]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China [4]Department of Materials Science and Engineering,Stanford University,Stanford 94305,USA

出　　处：《Rare Metals》2021年第6期1431-1436,共6页稀有金属（英文版）

基　　金：financially supported by the National Key Basic Research Program of China(No.2014CB932400);the Joint Fund of the National Natural Science Foundation of China(No.U1401243);the National Natural Science Foundation of China(No.51232005);Shenzhen Technical Plan Project(Nos.JCYJ20150529164918735,CYJ20170412170911187 and KQJSCX20160226191136);Guangdong Technical Plan Project(No.2015TX01N011)。

摘　　要：Lithium-ion batteries(LIBs)represent efficient energy storage technology that can help to alleviate fossil fuel-based CO_(2) emissions.Presently,LIBs are being applied extensively in consumer electronics and electric vehicles,but because of limited resources,there is an urgent need for spent LIB recycling technologies.The complexity of LIBs,especially the electrode part,makes it difficult to achieve precision separations for each single component from the used electrode with low emissions.Herein,we propose a three-step treatment for the separation of cathode components.In detail,detaching of the current collector from the cathode is accomplished by the solvent method,which was found to be an ideal strategy compared with previous reports.Then,a thermal treatment is used to remove the polymer binder in the second step because we demonstrated that it is challenging to separate polyvinylidene fluoride(PVDF)from other cathode components by dissolution with N-methylpyrrolidone.The separation efficiency between the active material and conductive carbon by the polymer solution in the third step showed reasonably good results.We anticipate this work will serve as an important reference for the separation of each single electrode component in both laboratory-and industrialscale applications.Separation of binder and development of novel binders,which can be easily recycled for sustainable LIBs,are fruitful areas for further research.

关 键 词：Lithium-ion batteries RECYCLING Electrode separation PVDF Thermal treatment Polymer solution 

分 类 号：X705[环境科学与工程—环境工程]