在水性离子电池中高效地空间时间同步构建强大的Li3PO4 - - 富含固体电解质的固体电解质介面
Xiangzhen Zhu1,2,3, Zejing Lin1, Jingning Lai4
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Angewandte Chemie (International ed. in English)
|December 11, 2023
概括
研究人员开发了一种用于水性电池的空间时间同步 (STS) 固体电解质介相 (SEI). 这种强大的SEI通过利用进化的副产品实现了100%的SEI形成效率,提高了电池的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 固体电解质介相 (SEI) 将水性电解质的电化学窗口扩展到水的热力学极限之外.
- 水性电解质的挑战包括由于进化导致的低SEI形成效率 (SFE) 和低SEI形成质量 (SFQ),导致高损失.
- 现有的方法很难在水系统中形成高能耗和强大的SEI.
研究的目的:
- 开发一种高效的策略,用于在水性电解质中构建一个强大的空间时间同步 (STS) SEI.
- 为了克服水性电池系统中低SFE和SFQ的局限性.
- 为了使离子/度独立的水性电池界面化学.
主要方法:
- 采用了包括化学沉和电化学还原在内的协同策略来构建SEI.
- 利用从演化反应 (HER) 中生成OH-用于现场Li3PO4沉.
- 研究了二酸 (H2PO4-) 捕获OH-以在活性位点形成Li3PO4的机制.
主要成果:
- 实现了强大的Li3PO4丰富的SEI与100%的SFE,利用HER的副产品 (OH-),而不消耗阴极.
- 成功将HER电位转移到-1.8V与Ag/AgCl相比,表明稳定性得到改善.
- 证明了一种适用于水性电池的充满活力和强大的SEI.
结论:
- 拟议的STS战略有效地在水性电解质中构建一个高质量的SEI.
- 富含Li3PO4的SEI形成机制通过利用HER产品来提高效率和稳定性.
- 这种方法为离子/度独立的水性电池界面工程提供了一个新的途径.
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