文献类型：期刊文献

英文题名：A novel strategy to significantly enhance the initial voltage and suppress voltage fading of a Li- and Mn-rich layered oxide cathode material for lithiumion batteries

作者：Zhang, Shiming[1];Chen, Jian[2];Tang, Tian[1];Jiang, Yinzhu[1];Chen, Gairong[3];Shao, Qinong[1];Yan, Chenhui[1];Zhu, Tiejun[1];Gao, Mingxia[1];Liu, Yongfeng[1];Pan, Hongge[1]

第一作者：Zhang, Shiming

通讯作者：Pan, HG[1]

机构：[1]Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China;[2]Xian Technol Univ, Sch Mat Sci & Chem Engn, Xian 710021, Shaanxi, Peoples R China;[3]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China

通讯机构：[1]corresponding author), Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Zhejiang, Peoples R China.

年份：2018

卷号：6

期号：8

起止页码：3610-3624

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20180904839894);Scopus(收录号：2-s2.0-85042402614);WOS:【SCI-EXPANDED(收录号:WOS:000425623600035)】；

基金：This work was supported by the National Natural Science Foundation of PR China (No. 51571178), the Aerospace Science and Technology Innovation Fund of CASC, and the National Materials Genome Project (2016YFB0700600), National Natural Science Foundation of PR China (No. 51371158).

语种：英文

外文关键词：Cathodes - Coatings - Electric discharges - Electrolytes - High resolution transmission electron microscopy - Ion exchange - Ions - Lithium compounds - Lithium-ion batteries - Morphology

摘要：In this work, a Li[Li0.2Ni0.13Co0.13Mn0.54] O-2-xLiNiO(2) composite cathode with a Ni-rich bulk phase and in situ precipitated Ni-rich spinel-like phase on the surface has been built up to significantly enhance the initial voltage and suppress the voltage fading during cycling and consequently effectively increase the energy density. It is a novel strategy to combine Ni-ion substitution in the bulk phase and in situ precipitated spinel-like phase on the surface of particles in a facile one-step process. The initial average voltage of the Li[Li0.2Ni0.13Co0.13Mn0.54]O-2-0.4LiNiO(2) cathode largely improves to 3.8 V and the capacity reaches 277 mA h g(-1). It delivers a voltage retention of 94.1% and a capacity retention of 93.3% after 500 cycles. Structure and morphology are characterized using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The electrochemical performance is investigated using a galvanostatic charge and discharge test. Results show that the Ni2+ ions can exchange with Li+ ions to occupy the Li+ ion sites in the bulk phase. Moreover, the Ni2+ ions also easily diffuse into the surface region of the Li[Li0.2Ni0.13Co0.13Mn0.54]O-2- xLiNiO(2) (x = 0.0-0.4) particle to form a Ni-rich LiNiyMn2-yO4 spinel-like phase in situ precipitated coating layer. The Ni2+ ion substitution in the bulk phase can effectively suppress the formation of the spinel-like phase during cycling and the in situ precipitated surface coating of the Ni-rich spinel-like phase can significantly enhance the structure stability of the interface between the surface of the electrode and the electrolyte during cycling.