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Enhancing the interfacial stability of LiNi0.8Co0.15Al0.05O2 cathode materials by a surface-concentration gradient strategy
Zhou, Xin'an1; Zhang, Feilong1,2; Wang, Chao1; Fu, Xiaolan1; Wang, Bo1; Zhao, Dongni1,2; Wang, Peng1; Liang, Wenbiao1; Li, Shiyou1,2,3
2021-10-19
发表期刊DALTON TRANSACTIONS
ISSN1477-9226
卷号50期号:40页码:14187-14195
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.
DOI10.1039/d1dt02379a
收录类别EI ; SCOPUS ; SCIE
语种英语
WOS研究方向Chemistry
WOS类目Chemistry, Inorganic & Nuclear
WOS记录号WOS:000697791300001
出版者ROYAL SOC CHEMISTRY
来源库WOS
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符https://ir.lut.edu.cn/handle/2XXMBERH/148816
专题图书馆
石油化工学院
通讯作者Li, Shiyou
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
第一作者单位兰州理工大学
通讯作者单位兰州理工大学
第一作者的第一单位兰州理工大学
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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.
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