文献类型：期刊文献

英文题名：Enhanced Li-ion intercalation kinetics and lattice oxygen stability in single-crystalline Ni-rich Co-poor layered cathodes

作者：Zhang, Hujun[1];Qin, Li[1];Sedlacik, Michal[3];Saha, Petr[3];Cheng, Qilin[1];Yu, Haifeng[1,2];Jiang, Hao[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;[3]Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic

年份：2024

卷号：12

期号：6

起止页码：3682

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20240415439681);WOS:【SCI-EXPANDED(收录号:WOS:001142164300001)】；

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

语种：英文

外文关键词：Aluminum compounds - Barium compounds - Cobalt compounds - Ions - Kinetics - Lithium compounds - Lithium-ion batteries - Manganese compounds - Nickel oxide - Oxygen - Stability

摘要：Single-crystalline nickel-rich cobalt-poor layered oxides are promising cathode materials for lithium-ion batteries due to their high safety and competitive cost. However, the severe cation disorder and lithium/oxygen (Li/O) loss during the high-temperature calcination process result in slow Li-ion diffusion and inferior O stability. Herein, a LiNi0.85Co0.05Mn0.10O2 (NCM85) single-crystalline cathode was prepared at relatively lower lithiation temperatures by barium/aluminum (Ba/Al) co-doping. The increase in the c-axis caused by Ba doping with a larger ion radius and the reduction in Li/Ni disorder can enhance the Li-ion diffusion kinetics, while the strong Ba-O and Al-O bonds considerably boost the lattice O stability to alleviate O escape during the charging process. The optimized cathode exhibits a high reversible capacity of 206.5 mA h g-1 at 0.1C and 115.6 mA h g-1 at 5C. Impressively, 87.5% of initial capacity is still maintained after 500 cycles at 1C in a pouch-type full cell. This finding provides a viable and flexible method to resolve the kinetics and stability issues of other layered oxide cathodes. Ba/Al co-doping effectively lower the calcination temperature, greatly reduces Li/Ni mixing and expands the c-axis parameter, and stabilizes the lattice oxygen, resulting in enhanced Li-diffusion kinetics and excellent cycle life.