文献类型：期刊文献

英文题名：All-Dry Synthesis of Single-Crystalline LiNi0.6Mn0.2Co0.2O2 Cathodes for High-Energy and Long-Life Li-Ion Batteries

作者：Jiang, Xin[1];Qin, Li[1];Yu, Haifeng[1,2];Chen, Ling[1];Jiang, Hao[1,2];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：63

期号：23

起止页码：10291

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20242316204842);WOS:【SCI-EXPANDED(收录号:WOS:001236199100001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22A20429 and 22308103), Postdoctoral Fellowship Program of CPSF (GZB20230214), China Postdoctoral Science Foundation (2023M731083), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Cost effectiveness - Grain boundaries - Ions - Lithium compounds - Lithium-ion batteries - Manganese compounds - Nickel compounds - Sintering - Strontium compounds - Synthesis (chemical)

摘要：Single-crystalline LiNi0.6Mn0.2Co0.2O2 cathodes (NMC622) synthesized by all-dry solid-phase synthesis (ADSPS) are promising candidates for high-voltage Li-ion batteries (LIBs) in virtue of their ecofriendly and cost-effective merits. However, serious Li/O loss at high sintering temperatures results in their structural and interfacial instabilities. Herein, a strontium/tantalum (Sr/Ta) codoped and lithium-borate (LBO) coated single-crystalline LiNi0.6Mn0.2Co0.2O2 (NMC622) with a superior layered structure is successfully prepared by ADSPS for the first time. Sr ions can reduce the sintering temperature by promoting grain-boundary fusion and particle growth, while Ta ions with a high Ta-O bond energy (839 kJ mol(-1)) further alleviate oxygen loss to decrease Li/Ni mixing and oxygen vacancies. The LBO coating layer helps to remove surface residual alkali, enhancing interfacial stability and Li-ion transfer dynamics. Therefore, the resultant cathode displays a high capacity of 191.9 mAh g(-1) at 0.1C with a superior capacity retention of 81.6% at 1C within 2.7-4.5 V after 2000 cycles in pouch-type full cells.