用于高负载基双离子电池的界面自相兼容准固体电解质的溶解设计
Hailiang Xie1,2, Hailiang Mu1, Lingwen Liu3,4
1Advanced Energy Storage Technology Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|August 22, 2025
概括
研究人员开发了一种用于基双离子电池 (SDIB) 的新准固体电解质. 这种创新提高了稳定性和性能,使高容量储能解决方案成为可能.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 基于的双离子电池 (SDIB) 由于成本低且电压高,因此对静止式储能具有前景.
- SDIB中的液体电解质受到溶剂协同插入和氧化的影响,限制了性能,特别是在高阴极负载 (>5 mg cm-2).
研究的目的:
- 开发一种用于SDIB的新型准固体电解质 (ACPE),解决液体电解质的局限性.
- 提高SDIB的稳定性和效率,特别是在高阴极负载条件下.
主要方法:
- 使用添加剂诱导的溶解设计策略来创建一个界面自相容的准固体电解质 (ACPE).
- 该添加剂被设计为优先与PF6−协调而不是EMC,防止溶剂协同插入并形成保护性阴极-电解质间相 (CEI).
- 评估了使用ACPE的SDIB的电化学性能,包括循环稳定性,速率能力和超高阴极负载的性能.
主要成果:
- 该ACPE显示出高氧化稳定性 (5.5V) 并有效抑制了石墨阴极上的溶剂协同干扰.
- 在阳极上形成的强大的介相使稳定的涂/剥离能够持续300多小时.
- 在现场制造的高阴极负荷 (>6.0 mg cm-2) 的准固体SDIB实现了超过900个稳定周期,并在10°C保持了84.6%的容量保留.
- 即使在超高的正极负荷 (>16.0 mg cm-2),SDIB也保持了300个周期的稳定容量.
结论:
- 开发的ACPE显著提高了SDIB的稳定性和性能,克服了传统液体电解质的关键局限性.
- 添加剂诱导的溶解策略为设计用于储能应用的高性能,高负载的SDIB提供了新的途径.
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