In Situ Electropolymerization Enables Ultrafast Long Cycle Life and High‐Voltage Organic Cathodes for Lithium Batteries
In Situ Electropolymerization Enables Ultrafast Long Cycle Life and High‐Voltage Organic Cathodes for Lithium Batteries
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原位电聚合实现锂电池的超快长循环寿命和高压有机阴极
DOI：
10.1002/anie.202000566
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yunhua Xu
中科院分区：
文献类型：
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作者：
Chen Zhao;Zifeng Chen;Wei Wang;Peixun Xiong;Benfang Li;Mengjie Li;Jixing Yang;Yunhua Xu
有机正极材料因其结构多样、合成方便、环境友好等优点而受到广泛关注。然而，由于溶解问题、速率性能差和电压低，它们往往存在循环稳定性不足的问题。提出了一种原位电聚合方法来稳定和增强锂电池的有机阴极。采用4,4 ',4 ' ' -三（咔唑- 9 -基）-三苯胺（TCTA），因为咔唑基团可以在电场下聚合，并且它们可以作为高压氧化还原活性中心。电聚合后的TCTA电极具有3.95 V的高放电电压、20 ag−1的超快放电速率和5000次的长循环寿命等优异的电化学性能。我们的发现为解决溶解问题提供了一种新的策略，并探索了用于可充电电池的有机电极材料的分子设计。
Organic cathode materials have attracted extensive attention because of their diverse structures, facile synthesis, and environmental friendliness. However, they often suffer from insufficient cycling stability caused by the dissolution problem, poor rate performance, and low voltages. An in situ electropolymerization method was developed to stabilize and enhance organic cathodes for lithium batteries. 4,4′,4′′‐Tris(carbazol‐9‐yl)‐triphenylamine (TCTA) was employed because carbazole groups can be polymerized under an electric field and they may serve as high‐voltage redox‐active centers. The electropolymerized TCTA electrodes demonstrated excellent electrochemical performance with a high discharge voltage of 3.95 V, ultrafast rate capability of 20 A g−1, and a long cycle life of 5000 cycles. Our findings provide a new strategy to address the dissolution issue and they explore the molecular design of organic electrode materials for use in rechargeable batteries.