二硫化满足空缺:作为一个多功能多硫化媒介的高效催化剂,用于强大的硫电池
Qianhong Gong1, Dawei Yang1,2, Huiping Yang3
1Henan Key Laboratory of Quantum Materials and Quantum Energy, School of Quantum Information Future Technology, Henan University, Kaifeng 475004, China.
ACS nano
|October 3, 2024
概括
这项研究引入了空置工程二化物 (v-CoTe2) 作为硫电池 (LSB) 的硫宿主. 催化剂有效地抑制了聚硫化物穿,并增强了反应动力学,提高了电池的性能和稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 硫电池 (LSB) 的商业化受到聚硫化物 (LiPS) 穿效应和缓慢的阴极反应动力学的阻碍.
- 开发先进的阴极材料对于提高LSB性能至关重要.
研究的目的:
- 为 LSBs开发一种新的硫宿主材料.
- 调查空缺工程在二化物 (CoTe2) 中对增强LiPS相互作用和催化活性的作用.
主要方法:
- 在添加碳的支持下合成空缺工程二化物 (v-CoTe2).
- 密度函数理论 (DFT) 计算以了解电子结构和LiPS相互作用.
- 在LSB中对v-CoTe2@S阴极进行电化学测试.
主要成果:
- 由于调制的电子配置,v-CoTe2对LiPS具有增强的化学亲和力和催化活性.
- 在v-CoTe2中的Te空位产生自旋极化电子,进一步加速LiPS氧化还原反应动力学.
- 该v-CoTe2@S阴极显示出高的初始容量,良好的周期稳定性 (80.4%的容量保留在3°C的500个周期后),以及高的面积容量 (6.1mA h cm-2在6.7mg cm-2硫负载时).
结论:
- 在CoTe2中空置工程是开发LSB中有效的硫宿主的一个有希望的策略.
- 该v-CoTe2材料显著减轻了穿效应,并改善了LSB的整体电化学性能.
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