Integrating Multiredox Centers into One Framework for High-Performance Organic Li-Ion Battery Cathodes
Integrating Multiredox Centers into One Framework for High-Performance Organic Li-Ion Battery Cathodes
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DOI：
10.1021/acsenergylett.9b02466
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发表时间：
2020-01-01
影响因子：
22
通讯作者：
Wang, Chunsheng
中科院分区：
文献类型：
--
作者：
Cui, Chunyu;Ji, Xiao;Wang, Chunsheng
有机正极材料是发展高能高功率锂离子电池的重要材料。然而，大多数有机阴极的能量存储依赖于单一类型的官能团的电子转移，导致低氧化还原电位或低容量。本文提出了有机材料结构设计和性能优化的新策略。报道了一种新的有机阴极二氰蒽醌（DTN），它在一个骨架中含有三个官能团（-S-，C=O，C = N）。-S-基团将氧化还原电位提高到3.0 V，而C=O和C相当于N基团使得能够进行三个Li离子参与的氧化还原反应。作为阴极，DTN在0.5C下300次循环提供270.2 mAh g（-1）。即使在5C下，1000次循环后仍保持161.5mAh g（-1）。高容量、高功率和稳定的DTN阴极为高性能和可持续的LIB提供了巨大的希望。
Organic cathode materials are promising for developing high-energy and high-power Li-ion batteries (LIBs). However, the energy storage of most organic cathodes relies on the electron transfer of a single type of functional group, leading to either a low redox potential or a low capacity. Here we propose a new strategy for the structure design and performance optimization of organic materials. A new organic cathode, dithianon (DTN), containing three functional groups (-S-, C=O, C equivalent to N) in one framework, is reported. The -S- group increases the redox potential to 3.0 V, while C=O and C equivalent to N groups enable a three Li-ions-involved redox reaction. As a cathode, DTN delivers 270.2 mAh g(-1) at 0.5C for 300 cycles. Even at 5C, it still retains 161.5 mAh g(-1) after 1000 cycles. The high-capacity, high-power, and stable DTN cathode offers great promise for high-performance and sustainable LIBs.