一个Ternary (P,Se,S) 性无机框架作为Li-S电池的无穿效应的阴极
Lu Chen1,2, Ting He1, Kexuan Liao1
1School of Chemical Science and Engineering, Tongji University, Siping Road, 1239, Shanghai, 200092, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|November 21, 2023
概括
一种新的P4Se6S40共价无机框架 (CIF) 材料有效地抑制了硫 (Li-S) 电池中的穿效应. 这种新的正极材料显示出高容量和优良的保留能力,用于实际的高能耗应用.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 聚硫化物 (LiPS) 的穿效应是实用的高能硫 (Li-S) 电池的主要障碍.
- 开发先进的阴极材料对于减轻这一挑战的源头至关重要.
研究的目的:
- 探索一种新的含硫三元共价无机框架 (CIF) 作为Li-S电池的阴极材料.
- 研究新材料抑制穿效应并提高电池性能的机制.
主要方法:
- 通过共同化元素 (P),硫 (S) 和 (Se) 来合成P4Se6S40 CIF.
- 在Li-S电池中P4Se6S40阴极的电化学表征,包括容量,循环稳定性和速率性能.
- 在循环过程中分析材料的结构及其与LiPS的相互作用.
主要成果:
- P4Se6S40 CIF展示了一个开放的框架,允许完全访问活跃站点,从而实现高容量交付.
- 加入 (Se) 增强了固有的电子导电性,并起到异原子屏障的作用,防止长链聚硫化物形成.
- 在化后形成的3化硫化物 (Li3PS4) 作为离子导体,以及对LiPS溶解和扩散的物理/化学屏障.
- 阴极表现出高容量和在10.5毫克厘米-2的高负载下优异的保留,显著抑制了穿效应.
结论:
- P4Se6S40 CIF是Li-S电池的一个有前途的阴极材料,有效地解决了穿效应.
- 该材料的独特结构和组成有助于提高电化学性能和稳定性.
- 这项工作为设计用于高能储存应用的先进阴极材料提供了新的策略.
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