储能科学与技术 ›› 2015, Vol. 4 ›› Issue (3): 284-289.doi: 10.3969/j.issn.2095-4239.2015.03.007

• 研究及进展 • 上一篇    下一篇

超临界水热结合固相煅烧法制备LiMn2O4正极材料

刘学武1, 2, 冯铁柱1, 李婧3, 陈国华2   

  1. 1 大连理工大学化工机械学院,辽宁 大连 116024;
    2 广州市香港科大霍英东研究院,广东 广州 511458;
    3 南开大学化学学院,天津 300071
  • 收稿日期:2014-10-28 出版日期:2015-06-19 发布日期:2015-06-19
  • 通讯作者: 刘学武（1974—）,男,博士,副教授,研究方向为锂离子电池及其关键材料,E-mail：liuxuewu@dlut.edu.cn。
  • 作者简介:刘学武（1974—）,男,博士,副教授,研究方向为锂离子电池及其关键材料,E-mail：liuxuewu@dlut.edu.cn。
  • 基金资助:
    中央高校基本科研业务费专项资金（DUT15ZD109）及国家自然科学基金（21376035）项目

Preparation of spinel LiMn2O4 by supercritical hydrothermal method with heat-treatment

LIU Xuewu1, 2, FENG Tiezhu1, LI Jing3, CHEN Guohua2   

  1. 1 School of Chemical Machinery, Dalian University of Technology, Dalian 116024, Liaoning, China;
    2 Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou 511458, Guangdong, China;
    3 College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2014-10-28 Online:2015-06-19 Published:2015-06-19

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摘要： 利用超临界水热结合后续煅烧处理的方法制备了锂离子电池正极材料LiMn2O4,并详细讨论了超临界水热反应过程中反应压力、反应温度和后续处理煅烧温度对LiMn2O4材料晶型、颗粒形貌和电化学性能的影响。实验结果表明,LiMn2O4材料在400 ℃、30 MPa下反应15 min,后续经过700 ℃煅烧3 h得到的样品具有结晶度良好、颗粒分布均匀等优点。LiMn2O4材料制备的扣式电池表现出优异的电化学性能,0.1 C倍率下初始放电比容量为125 mA·h/g;1 C下循环50周同样表现出良好的电化学性能。

关键词: LiMn2O4, 超临界水热, 固相煅烧

Abstract: In this study, the synthesis of the spinel structure lithium manganese oxide (LiMn2O4) by supercritical-hydrothermal (SH) accelerated solid state reaction (SSR) route is reported. The effects of the reaction pressure, temperature and the calcination temperature on the purity, morphology and electrochemical properties of the prepared LiMn2O4materials were studied. The experimental results showed that the prepared LiMn2O4 materials with 15 minutes reaction in the SH route at 400 ℃ and 30 MPa with additional 3 h calcinations at 700 ℃ exhibited good crystallinity, uniform size distribution and good electrochemical performance. The initial specific capacity reached 125 mA·h/g at 0.1 C, and good cycle performance was shown after 50 cycles at 1 C.

Key words: LiMn2O4, supercritical water, solid state reaction

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