聚苯胺纳米点包覆LiNi_(0.8)Co_(0.15)Mn_(0.05)O_(2)正极材料的电化学性能研究  

Application of nanodot PANI as a protective coating for LiNi_(0.8)Co_(0.15)Mn_(0.05)O_(2) cathode materials

作　　者：李建营 李绍敏 杨茂夏 赵佰庆 刘昊 LI Jianying;LI Shaomin;YANG Maoxia;ZHAO Baiqing;LIU Hao(Chengdu Development Center of Science and Technology, China Academy of Engineering Physics,Chengdu 610200, China)

机构地区：[1]中物院成都科学技术发展中心中国工程物理研究院,成都610200

出　　处：《功能材料》2021年第9期9095-9101,9108,共8页Journal of Functional Materials

基　　金：四川省科技资助项目(2020YFG0418,2019JDJQ0046);国家自然科学基金资助项目(U1930208);精密制造技术实验室资助项目(ZM18002);中国工程物理研究院基金资助项目(CX20200009)。

摘　　要：目前高镍材料存在长循环寿命差、安全性能低等问题。表面包覆是提升高镍材料电化学性能的有效手段。本文通过具有导电特性的高分子聚苯胺纳米点包覆高镍正极材料LiNi_(0.8)Co_(0.15)Mn_(0.05)O_(2)从而提高其循环性能。包覆后的材料在0.2C倍率下100圈循环后容量为184.1 mAh/g,保持率为95.7%。1C倍率下循环100圈后容量为156.3 mAh/g,保持率为88.3%。可见纳米点PANI包覆NCM能提高高镍材料的循环稳定性。实验表明材料循环性能提高的原因在于聚苯胺纳米点包覆可以抑制材料表面副反应的发生以及H2-H3结构相变。Ni-rich cathode materials have drawn lots of attention owing to its energy density.Nevertheless,rapid capacity fading and poor thermal stability are critical problem that desiderate to be settled.In this article,the high conductive polymers of polyaniline(PANI)are designed for the surface modification of LiNi_(0.8)Co_(0.15)Mn_(0.05)O_(2) cathode materials.The surface-modified samples exhibit superior capacity retention after 100 cycles at 0.2 C and 1 C,95.7%at 184.1 mA/g and 88.3%at 156.3 mA/g.This can be attributed to the conductive polymer nanodots forming a coating layer to protect the nickel-rich materials surface to suppress the side reactions and the phase transformations of H2-H3.

关 键 词：锂离子电池 高镍正极材料 聚苯胺 纳米点包覆 LiNi_(0.8)Co_(0.15)Mn_(0.05)O_(2) 

分 类 号：O646[理学—物理化学]