长寿命,高速可充电电池,基于可溶性双二甲二硫化物阴极
Hansong Xing1, Wenlong Guo1, Shuai Tang1
1College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Angewandte Chemie (International ed. in English)
|July 24, 2023
概括
二甲二硫化物 (Pym2S2) 为高速率,长周期寿命的可充电电池提供了解决方案. 它独特的电子结构促进了快速的电子转移,克服了传统有机硫阴极的局限性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 有机化学 有机化学
背景情况:
- 由于成本和容量,有机硫化物是用于储能的有吸引力的正极材料.
- 限制包括缓慢的动力学和在电池循环过程中S-S键重组引起的降解.
- 开发高速,稳定的有机阴极材料仍然是一个重大挑战.
研究的目的:
- 为了研究 bis(2-pyrimidyl) disulfide (Pym2S2) 作为可充电电池的高速阴极材料.
- 阐明其增强的电化学性能背后的机制.
- 为先进的有机阴极材料提供新的设计策略.
主要方法:
- 使用Pym2S2作为阴极的半电池的电化学测试.
- 电子结构和分子轨道相互作用的分析.
- 研究S-S键解离能和电子转移动力学.
主要成果:
- 可溶性Pym2S2在可充电电池中表现出高速率的性能.
- 胺基组中的超定位化促进了电子在π*轨道上的定位,减少了S-S键解离能.
- 半电池在5°C的温度下实现了2000个循环,降解最小.
结论:
- 通过控制的电子定位,Pym2S2克服了有机硫阴极的动力限制.
- 这项研究为设计高性能有机阴极材料提供了一条新的途径.
- 这些发现为先进的电动汽车和储能系统铺平了道路.
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