溶胶凝胶法制备LiMn_2O_4粉体及其电化学性能研究  

Preparation and Electrochemical Properties of LiMn_2O_4 Powder Prepared by Sol-gel Method

作　　者：孙为[1] 赵胜利[1] 吴朝阳[1] 

机构地区：[1]河南科技大学材料学院,河南洛阳471023

出　　处：《热加工工艺》2013年第24期70-72,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(20203006);国家重大基础研究计划(ZM200103B01);河南科技大学人才科研基金项目(04015);河南省教育厅自然科学计划项目(2006430005)

摘　　要：采用溶胶-凝胶(Sol-Gel)法并结合热处理工艺制备LiMn2O4粉体,研究煅烧温度对LiMn2O4粉体结构及电化学性能的影响。结果表明:以聚丙烯酸(PAA)、硝酸锂、硝酸锰为原料,在一定温度下合成了稳定的溶胶和凝胶,凝胶在450℃左右基本完全分解并逐渐形成LiMn2O4粉体。随着煅烧温度的升高,粉体颗粒逐渐增大,晶型趋于完整。700℃煅烧10 h得到的LiMn2O4颗粒大小均匀,晶型完整且没有团聚现象。1C倍率下首次放比电容量达到126 mAh/g,经50次循环后仍能达到120 mAh/g,容量保持率高达95.2%,表现出良好充放电稳定性。LiMn2O4 powder was synthesized by sol-gel and heating treatment process.The influence of calcination temperature on the microstructure and electrochemical performance was explored.The results show that the stable sol and gel are prepared by PAA,LiNO3and Mn（NO3）2 in water solution.The gel entirely decomposes at 450 ℃ and gradually forms the LiMn2O4 powder.With the increase of calcination temperature,LiMn2O4 particle becomes larger and the crystal structure is more integrity.LiMn2O4 powder prepared by heating treatment gel at 700 ℃ for 10 h exhibits uniform distribution,high crystallinity and low agglomeration.The first discharge capacity reaches 126 mAh/g under the rate of 1C,and the capacity remains 120 mAh/g after 50 cycles.The capacity retention ratio reaches 95.2%,which can prove that LiMn2O4has stable cycle performance.

关 键 词：LIMN2O4 溶胶-凝胶 结构 电化学性能 

分 类 号：TG113.23[金属学及工艺—物理冶金]