文献类型：期刊文献

英文题名：Dual modification of LiNi_0.6Co_0.2Mn_0.2O₂ with MgHPO₄ as a high-performance cathode material for Li-ion batteries

作者：Ge, Wujie Fu, Yuanxiang Ma, Xianguo Li, Xiang Peng, Gongchang

第一作者：葛武杰

通信作者：Li, X[1];Peng, GC[2]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;[2]Henan Univ Sci & Technol, Sch Chem Engineer & Pharm, Luoyang 471023, Peoples R China;[3]Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Henan Univ Sci & Technol, Sch Chem Engineer & Pharm, Luoyang 471023, Peoples R China;corresponding author), Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China.

年份：2022

卷号：1

期号：1

起止页码：28-37

外文期刊名：ENERGY ADVANCES

收录：WOS:【ESCI(收录号:WOS:001114313900001)】；

基金：This work was supported by the National Natural Science Foundation of China (grant No. 21805053 and No. 51963004), the Science and Technology Planning Project of Guizhou Province (No. [2019]1132), the High Level Scientific Research Funding Project of Guizhou Institute of Technology (XJGC20190901) and the Collaborative Innovation Project of Industrial Cluster of Chengdu, Sichuan (2017-XT00-00001-GX), Key Scientific Research Projects of Colleges and Universities of Henan Provincial Department of Education (No. 21A150018).

语种：英文

摘要：MgHPO4 has been introduced as a reactant that interacts with LiNi0.6Co0.2Mn0.2O2 (NCM622) to achieve the dual modification of Mg2+ gradient doping and Li3PO4 surface coating. The structure, morphology, elemental distribution, and electrochemical properties of the materials are elaborately explored using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. On the one hand, Mg2+ gradient doping stabilizes the crystal structure of the Li+/Ni2+ cation and minimizes its disorder. On the other hand, the coating of the fast lithium-ion conductor Li3PO4 not only increases the rate of lithium-ion diffusion at the electrode-electrolyte interface but also protects the cathodic material and mitigates electrolyte corrosion. The dual-modified NCM622 cathode exhibits remarkable cycling performance, retaining 89.57% of its capacity after 200 cycles at 1C from 2.8 to 4.3 V and 79.03% after 100 cycles at 3C from 2.8 to 4.5 V. Additionally, the dual-modified cathode exhibits better electrode kinetics and a reversible capacity of 119.4 mA h g(-1) at 10C. This straightforward dual modification technique improves the lithium-ion diffusion kinetics at the interface while also stabilizing the internal crystal structure of Ni-rich cathode materials.