锂离子电池正极材料LiNi_(0.5)Mn_(1.5)O_4的固相法制备及性能研究  

Synthesis and characterization of LiNi_(0.5)Mn_(1.5)O_4 cathode materials for lithium ion batteries by solid state method

作　　者：李军[1] 朱建新[1] 李少芳[1] 李庆彪[1] 黄慧民[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《功能材料》2013年第19期2796-2799,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20672023);广东省科技计划资助项目(2012B050100010);广州市科技计划资助项目(2011Y1-00010)

摘　　要：以Ni(CH3COO)2·4H2O和Mn(CH3COO)2·4H2O为原料,分别在400、500℃分解3、7h得到镍锰复合氧化物前驱体,再与锂源Li2CO3混匀,在800℃煅烧12h,600℃退火24h得到LiNi0.5Mn1.5O4正极材料。XRD、SEM、EIS和恒流充放电测试结果表明,在400℃、7h制备的前驱体与Li2CO3合成的LiNi0.5Mn1.5O4性能最佳。室温下以0.1C倍率充放电,首次放电比容量达到141.5mAh/g,循环30次后容量保持率为98.55%;以1C倍率充放电,首次放电比容量为120.34mAh/g,循环30次后放电比容量为112.09mAh/g。LiNi0.5Mn1.5O4 cathode materials were synthesized by solid state method using Ni （CH3 COO）2 · 4H20,Mn（CH3COO）2 · 4H2O as starting materials, then decomposed to get nickel manganese oxides at 400 and 500℃ for 3 or 7h,joined and mixed the source of lithium Li2CO3. The sample was calcined in air at 800℃ for 12h and then annealed at 600℃ for 24h. XRD, SEM, EIS and charge-discharge performance tests showed that LiNi0.5Mn1.5O4 delivered the best electrochemical performance by used precursor made at 400℃ for 7h. Its initial specific discharge capacity was 141.5mAh/g when 0.1C charge-discharge at room temperature,and after 30 cycles the capacity retention was 98.59%;when charged-discharged at 1C initial capacity was 120.34mAh/g, and after 30 cycles the capacity was 112.09mAh/g.

关 键 词：锂离子电池 正极材料 LINI0 5Mn1 5O4 

分 类 号：TM912.9[电气工程—电力电子与电力传动]