文献类型：期刊文献

英文题名：Perovskite Oxides Alleviate Microstrain and Anion Loss of Radially-Aligned Ni-Rich Ncm811 Cathodes under High-Voltage Operations

作者：Wang, Zhihong[1,2];Wei, Wu[1];Zhang, Tao[2];Yu, Haifeng[3];Li, Chunzhong[1,3];Chen, Ling[1];Jiang, Hao[1,3]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai 200050, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：20

期号：4

外文期刊名：SMALL

收录：;EI(收录号：20233814736506);WOS:【SCI-EXPANDED(收录号:WOS:001065922500001)】；

基金：Z.W. and W.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (U22A20429), the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：lattice oxygen; Li-ion batteries; Ni-rich cathodes; perovskite oxides; strain engineering

摘要：The energy density of Ni-rich cathodes is expected to be further unlocked by increasing the cut-off voltage to above 4.3 V, which nevertheless come with significantly increased irreversible phase transition and abundant side reactions. In this study, the perovskite oxides enhanced radial-aligned LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes are reported, in which the coherent-growth La2[LiTM]O4 clusters are evenly riveted into the crystals and the stable LaxCa1-x[TM]O3-x protective layer is concurrently formed on the surface. The reciprocal interactions greatly reduce the lattice strain during de-/lithiation. Meantime, the abundant oxygen vacancies of the coating layer are proved to reversibly capture (state of charge) and re-release (state of discharge) the oxygen radicals, fully avoiding their correlative side reactions. The resultant NCM811 displays negligible O2 and CO2 emissions when charging to 4.5 V as well as a thinner CEI film, therefore delivering a large capacity of 225 mAh g-1 at 0.1C in coin-type half-cells and a high retention of 88.3% after 1000 cycles at 1C in pouch-type full-cells within 2.7-4.5 V. The development of high-voltage Ni-rich cathodes exhibits a highly effective pathway to further increase their energy density. This work demonstrates that perovskite oxides enhanced Ni-rich cathodes consist of radially-aligned primary particles. The mechanical failure ote and the oxygen release of NCM811 were alleviated effectively. The resultant cathode has superior electrochemical performances and higher energy density at 4.5 V.image