文献类型：期刊文献

英文题名：Structure and cycle stability of SrHPO4-coated LiMn2O4 cathode materials for lithium-ion batteries

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

年份：2014

卷号：145

起止页码：201

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20144100094689);WOS:【SCI-EXPANDED(收录号:WOS:000344203900025)】；

基金：The work is supported by Shanghai Leading Academic Discipline Project (B502), Shanghai Nanotechnology Special Foundation (No. 11nm0500900) and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Lithium manganese oxide; Coating; Manganese dissolution; Elevated temperature performance

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.