Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy

doi:10.1039/d1dt02379a

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	Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy
	Zhou, Xin'an 1; Zhang, Feilong 1,2; Wang, Chao 1; Fu, Xiaolan 1; Wang, Bo 1; Zhao, Dongni 1,2; Wang, Peng 1; Liang, Wenbiao 1; Li, Shiyou 1,2,3
刊名	DALTON TRANSACTIONS
	2021-09
卷号	50 期号:40 页码:14187-14195
ISSN号	1477-9226
DOI	10.1039/d1dt02379a
英文摘要	Ni-rich LiNi0.8Co0.15Al0.05O2 materials have been successfully applied in electric vehicles due to the merits of high energy density which can meet the requirements for driving range. Nevertheless, the electrochemical performances of Ni-rich materials are limited by their structural instability. Herein, LiNi0.8Co0.15Al0.05O2 materials with the concentration-gradient structure of a Ni-rich core and a Co-rich surface were synthesized. The electrochemical results indicate that surface-concentration gradient LiNi0.8Co0.15Al0.05O2 provides improved electrochemical performance. It not only displays an initial Coulomb efficiency of 82.4%, and a capacity retention of 80.37% after 200 cycles at 25 degrees C, but also shows a capacity retention of 77.76% after 150 cycles at a high temperature of 55 degrees C. These excellent performances can be attributed to adjusting the distribution of Ni on the surface of the LiNi0.8Co0.15Al0.05O2 material, which inhibits the interfacial reaction between the material surface and electrolyte, lowers the consumption of active Li+ and decreases the interfacial film impedance. Moreover, less Ni content on the material surface is beneficial for reducing the formation of a NiO rock salt phase during the charging process and inhibits the surface structural evolution. The proposed method and detected mechanism will provide guidance for the design of cathode materials and their practical industrial applications.
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000697791300001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148816]
专题	石油化工学院图书馆
作者单位	1.Lanzhou Univ Technol, Sch Petrochem Technol, Lanzhou 730050, Peoples R China; 2.Key Lab Low Carbon Energy & Chem Engn Gansu Prov, Lanzhou 730050, Peoples R China; 3.Gansu Engn Lab Cathode Mat Lithium Ion Battery, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Xin'an,Zhang, Feilong,Wang, Chao,et al. Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy[J]. DALTON TRANSACTIONS,2021,50(40):14187-14195.
APA	Zhou, Xin'an.,Zhang, Feilong.,Wang, Chao.,Fu, Xiaolan.,Wang, Bo.,...&Li, Shiyou.(2021).Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy.DALTON TRANSACTIONS,50(40),14187-14195.
MLA	Zhou, Xin'an,et al."Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy".DALTON TRANSACTIONS 50.40(2021):14187-14195.