高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (9): 2911.doi: 10.7503/cjcu20210248

• 物理化学 • 上一篇    下一篇

有机盐PTO(KPD)2作为高性能锂离子电池正极材料的研究

鲍俊全, 郑仕兵, 苑旭明, 史金强, 孙田将, 梁静()   

  1. 南开大学化学学院, 先进能源材料化学教育部重点实验室, 天津 300071
  • 收稿日期:2021-04-12 出版日期:2021-09-10 发布日期:2021-09-08
  • 通讯作者: 梁静 E-mail:liangjing@nankai.edu.cn
  • 基金资助:
    国家重点研发计划项目(2016YFA0202500);国家自然科学基金(21673243)

An Organic Salt PTO(KPD)2 with Enhanced Performance as a Cathode Material in Lithium-ion Batteries

BAO Junquan, ZHENG Shibing, YUAN Xuming, SHI Jinqiang, SUN Tianjiang, LIANG Jing()   

  1. Laboratory of Advanced Energy Materials Chemistry,Ministry of Education,College of Chemistry,Nankai University,Tianjin 300071,China
  • Received:2021-04-12 Online:2021-09-10 Published:2021-09-08
  • Contact: LIANG Jing E-mail:liangjing@nankai.edu.cn
  • Supported by:
    the National Key Research and Development Program, China(2016YFA0202500);the National Natural Science Foundation of China(21673243)

摘要:

采用溶剂热反应合成了一种新型的有机盐材料芘四酮-二均苯四甲酸二酰亚胺二钾盐PTO(KPD)2. 该材料作为锂离子电池正极时, 表现出优异的循环和倍率性能. 研究结果表明, 在50 mA/g电流密度下, PTO(KPD)2的实际放电比容量达到255.8 mA·h/g; 在500 mA/g电流密度下循环800次后, 容量保持率为81.1%. PTO(KPD)2盐结构的形成提高了分子极性, 大大降低了其在电解液中的溶解度, 使得材料表现出优异的电化学性能.

关键词: 锂离子电池, 正极材料, 有机盐, 电化学性能

Abstract:

Organic compounds have recently attracted considerable attention as cathode materials in lithiu- mion batteries. However, high solubility in the organic electrolytes will cause a severe capacity deterioration, which limiting their application. Here, a new organic cathode material of pyrene-4,5,9,10-tetraone-di(potassium-pyromellitic diimide)[PTO(KPD)2] was obtained through a solvothermal reaction. As a cathode material in lithium-ion batteries, the multi-carbonyl formation gives a considerable practical capacity of 255.8 mA·h/g at a current density of 50 mA/g. Also, PTO(KPD)2 has a high capacity retention of 81.1% after 800 cycles at 500 mA/g, which shows excellent long-cycle performance. Benefiting from the polar organic salt structure, the solubility of PTO(KPD)2 in organic electrolytes sharply decreases. This work demonstrates that the structural merits of organic salts is an effective approach to preparing new organic cathode materials applied in lithiumion batteries with better electrochemical performance.

Key words: Lithium-ion battery, Cathode material, Organic salt, Electrochemical performance

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