稳定SPAN在非易燃的酸电解质中,用于长寿命的石墨电池
Yan Li1, Xiaoqun Qi1, Han Zhou1
1State Key Laboratory of Material Processing and Die & Mould Technology, Institute for Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Angewandte Chemie (International ed. in English)
|December 23, 2024
概括
硫化聚烯二 (SPAN) 阴极用于硫电池,现在可以使用更安全,不易燃的乙二电解质. 添加乙烯碳酸盐使SPAN稳定,使长时间的高性能能量存储成为可能.
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:
- 硫化聚烯 (SPAN) 为Li-S电池提供了可持续的,无穿的阴极,这对于静止能量存储至关重要.
- 目前的SPAN电池依赖于易燃的碳酸/乙太电解质,造成安全风险.
- 扩大SPAN的电解质选项对于实际应用至关重要.
研究的目的:
- 为了研究使用SPAN阴极的不可燃性乙尼 (AN) 电解质.
- 在AN电解质中识别SPAN的失效机制.
- 为了提高SPAN电池的稳定性和性能,使用新的电解质配方.
主要方法:
- 探索乙尼 (AN) 作为SPAN的非易燃电解质.
- 确定C-S债券裂变作为AN中的故障机制.
- 将乙烯碳酸盐 (FEC) 引入AN电解质以抑制降解.
- 电化学循环和性能评价的LICHAYUSISPAN和PGRICHAYUSISPAN的细胞.
主要成果:
- 在SPAN中不可逆转的C-S键裂解被确定为AN电解质中的主要故障模式.
- 将10%重量的FEC添加到AN电解质中,抑制了键裂变,形成了一个稳定的阴极-电解质接口.
- 立体中SPAN细胞在900个循环中表现出稳定的循环.
- pGrdegadgadgadgadSPAN全电池实现了1500个循环,保持了91%的容量并提高了安全性.
结论:
- 一种非易燃的基于AN的电解质,经FEC修改,成功地稳定了SPAN阴极.
- 这一进步显著改善了基于SPAN的Li-S电池的循环寿命和安全性.
- 这些发现扩大了SPAN电池的电解质选择,为其在能源存储中更广泛采用铺平了道路.
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