Li+ and Cl- co-doped LiNi0.5Mn1.5O4 cathode material with truncated octahedral shape and enhanced electrochemical performance for Li-ion batteries

被引：19

作者：

Wei, Aijia ^{[1
,2
,4
]}

Mu, Jinping ^{[1
,2
]}

He, Rui ^{[2
,4
]}

Bai, Xue ^{[2
,4
]}

Li, Xiaohui ^{[2
,4
]}

Wang, Yanji ^{[1
]}

Liu, Zhenfa ^{[1
,2
,4
]}

Wang, Suning ^{[3
]}

机构：

[1] Hebei Acad Sci, Inst Energy Resources, Shijiazhuang 050081, Hebei, Peoples R China

[2] Hebei Univ Technol, Sch Chem Engn & Technol, Tianjin 300130, Peoples R China

[3] Guilin Univ Technol, Coll Mat Sci & Engn, Guangxi Key Lab Opt & Elect Mat & Devices, Guilin 541004, Peoples R China

[4] Hebei Technol Innovat Ctr Funct Mat Lithium Batte, Shijiazhuang 050081, Hebei, Peoples R China

来源：

SOLID STATE IONICS | 2021年 / 371卷

关键词：

Li+ and Cl- co-doping; LiNi0.5Mn1.5O4; Lithium-ion batteries; Enhanced electrochemical performance; Truncated octahedral shape; SPINEL LINI0.5MN1.5O4; ELECTRODE MATERIALS; SURFACE-CHEMISTRY; LITHIUM; LIMN1.5NI0.5O4; IMPROVEMENT; STABILITY; MORPHOLOGY; CHROMIUM; DISORDER;

D O I：

10.1016/j.ssi.2021.115753

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-voltage spinel Li1+xNi0.5Mn1.5O4-xClx (0 <= x <= 0.04) cathode materials with different contents of Li+ and Cl co-doping were obtained through a solid-state process. Scanning electron microscopy and transmission electron microscopy images indicate that pure LiNi0.5Mn1.5O4 (LNMO, space group Fd-3 m) particles possess an octahedral morphology, predominantly exhibiting {111} crystallographic planes. While the specimens with Li+ and Cl co-doping display not only {111} crystal facets but also positive {100} and {110} facets (i.e. truncated octahedral shape) that could facilitate Li+ transport and stabilize the spinel structure. Compared to the pure LNMO, the Li+ and Cl- co-doped LNMO electrodes display superior electrochemical performances. For example, the Li1.03Ni0.5Mn1.5O3.97Cl0.03 exhibits the superior rate capability, with discharge capacities of 92.3 and 52.6 mA h g(-1) at 7C and 10C, respectively, which are much higher than those of pure LNMO (54.2 and 7.8 mA h g(-1) at 7C and 10C). An improved electrochemical properties of LNMO-Cl-0.03 is attributable to its relatively larger portion of {100} and {110} facets, lower charge-transfer resistance and electrode polarization, and higher Li+ diffusion coefficient.

引用

页数：12