LSC包覆改性LiFePO_4/C锂电池正极材料特性研究  

Performance study of La_(0.6)Sr_(0.4)CoO_(3-δ) coated LiFePO_4/C composite cathodes for lithium battery

作　　者：曹建梅 王学刚 李辛庚 岳增武 刁玉琦[2] 

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250002 [2]中国电子科技集团公司第十八研究所,天津300384

出　　处：《电源技术》2015年第6期1186-1188,共3页Chinese Journal of Power Sources

摘　　要：采用酒精悬浮液法对商用LiFePO4/C进行了La0.6Sr0.4Co O3-δ（LSC）包覆改性,LSC包覆量为1%~5%（质量分数）,通过充放电测试、电化学阻抗测试考察了不同包覆配比对材料高倍率放电比容量和循环性能的影响。结果表明,适当含量LSC包覆可提高LiFePO4电池高倍率放电比容量和循环性能,以4%（质量分数）LSC包覆改性的LiFePO4/C作为蓄电池正极材料时,2 C充放电时比容量较改性前提高22%,55次充放电循环后容量损失率减小22.1%,以其替代LiFePO4/C可增大蓄电池容量,延长蓄电池组使用寿命,具有良好的应用前景。Commercial LiFePO4/C particles were coated with La0.6Sr0.4CoO3-δ（LSC） via suspension mixing method, and the proportion of LSC was 1%-5%. The effects of LSC coating proportion on high rate discharge capacity and cycle performance were studied by galvanostatic charge/discharge test and electrochemical impedance spectroscopy （EIS）. The results indicate that proper content of LSC coating can significantly improve the specific capacity and cycle performance at high charge/discharge rates. The 4% LSC-coated LiFePO4/C sample exhibits the best electro- chemical performance with the capacity at 2 C increasing by 22% and the capacity loss rate after 55 charge/ discharge cycles decreasing by 22.1%.Using LSC-coated LiFePO4/C to replace LiFePO4/C can increase the capacity and service life of battery, which has promising prospect.

关 键 词：锂离子电池 LIFEPO4/C La0.6Sr0.4CoO3-δ 表面包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]