高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (7): 1684-1690.doi: 10.7503/cjcu20200033

• 材料化学 • 上一篇    

以酚醛树脂为碳源原位合成富锂层状相/尖晶石/碳核壳结构正极材料及其电化学性能

陆地1,郑春满1,*(),陈宇方1,*(),李宇杰1,张红梅2   

  1. 1.国防科技大学空天科学学院, 长沙 410073
    2.特种化学电源国家重点实验室, 贵州梅岭电源有限公司, 遵义 563003
  • 收稿日期:2020-01-15 出版日期:2020-07-10 发布日期:2020-04-15
  • 通讯作者: 郑春满,陈宇方 E-mail:zhengchunman@nudt.edu.cn;chenyufang@nudt.edu.cn
  • 基金资助:
    国家自然科学基金(51902343);湖南省自然科学基金(2018jj3595);特种化学电源国家重点实验室开放课题(SKL-ACPS C16)

Synthesis of Li-rich Layers/Spinel/Carbon Composite Cathode Materials with Phenol Formaldehyde Resin and Its Electrochemical Performance

LU Di1,ZHENG Chunman1,*(),CHEN Yufang1,*(),LI Yujie1,ZHANG Hongmei2   

  1. 1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
    2. State Key Laboratory of Advanced Chemical Power Sources, Guizhou Meiling Power Sources Co. Ltd., Zunyi 563003, China
  • Received:2020-01-15 Online:2020-07-10 Published:2020-04-15
  • Contact: Chunman ZHENG,Yufang CHEN E-mail:zhengchunman@nudt.edu.cn;chenyufang@nudt.edu.cn
  • Supported by:
    † National Natural Science Foundation of China(51902343);Natural Science Foundation of Hunan Province, China(2018jj3595);Opening Project of State Key Laboratory of Advanced Chemical Power Sources, China(SKL-ACPS C16)

摘要:

通过酚醛树酯包覆和碳热反应在富锂正极材料表面原位构建碳和尖晶石双壳保护结构, 对这种核壳结构的正极材料进行了结构和形貌表征, 并研究了其电化学性能. 研究发现, 尖晶石相为材料提供了三维锂离子迁移通道, 碳包覆层显著提高了正极材料的电子电导率, 两种效应的共同作用极大降低了材料的电化学阻抗, 提升了材料的放电比容量, 这种多壳层结构正极材料还具有优异的倍率性能, 在5C倍率下放电比容量可达到135.1 mA·h/g.

关键词: 锂离子电池, 富锂正极材料, 尖晶石层状复合正极, 碳包覆

Abstract:

A li-rich layers/spinel/carbon heterostructure cathode material was synthesized by phenol formaldehyde resin coating and subsequent carbon thermal reaction, the structure, monography and electrochemical performance of the material were studied. For this structure, the spinel phase plays a role to provide a three-dimensional lithium-ion transport channel while the carbon coating layer help with the conductivity of the cathode. Those two layers lower the electrochemical impedance of the material and improve the specific capacity. The cathode material deliver an excellent performance of 135.1 mA·h/g at 5C.

Key words: Lithium-ion battery, Lithium-rich cathode material, Spinel layered composite cathode material, Carbon coating

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