Structure and cycle stability of SrHPO4-coated LiMn2O4 cathode materials for lithium-ion batteries

被引：28

作者：

Zhang, Xiusheng ^{[1
]}

Xu, Yunlong ^{[1
]}

Zhang, Huang ^{[1
]}

Zhao, Chongjun ^{[1
]}

Qian, Xiuzhen ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Minist Educ,Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2014年 / 145卷

关键词：

Lithium manganese oxide; Coating; Manganese dissolution; Elevated temperature performance; ELEVATED-TEMPERATURE PERFORMANCE; ELECTROCHEMICAL PROPERTIES; MANGANESE OXIDE; SURFACE MODIFICATION; SPINEL LIMN2O4; LI; AL; CO; ENHANCEMENT; CHALLENGES;

D O I：

10.1016/j.electacta.2014.08.043

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The SrHPO4-coated LiMn2O4 composite materials are prepared through co-precipitation method. The phase structures and morphologies of pristine and SrHPO4 coated LiMn2O4 are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The cycling performances are thoroughly investigated and discussed both at room and elevated temperature. The results indicate that 2.0wt% SrHPO4 coated LiMn2O4 can efficiently improve the cycling performance with capacity retention of 92.3% and 83.6% under room temperature (25 degrees C) and elevated temperature (55 degrees C) after 100 cycles at 1 C rate, respectively, which are much better than those of the pristine materials. The CV, EIS and XRF measurements reveal that the enhanced stabilization in the cycling performance can be attributed to the suppression of manganese dissolution into electrolyte with the contribution of SrHPO4 coating on the surface of LiMn2O4. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：201 / 208

页数：8

共 44 条

[1] Enhancement of the electrochemical properties of Li1Mn2O4 through chemical substitution [J].