电解质设计结合化与化替代溶剂,用于无阳极的金属电池
Minglei Mao1, Lei Gong1, Xiaobo Wang1
1School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
概括
这项研究介绍了基以太电解质用于高能金属电池,提高了稳定性和性能. 新型电解质设计改善了金属阳极循环和NCM811阴极寿命.
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:
- 高能金属电池面临着替代电解质的挑战,包括低溶解功率和不稳定性.
- 现有的电解质遭受热和化学不稳定性,以及潜在的电池胀问题.
- 溶剂的氧化不稳定性限制了它们在先进的电池技术中的应用.
研究的目的:
- 为金属电池开发一种具有增强氧化稳定的新型电解质.
- 为了提高高能NCM811阴极和金属阳极的性能和周期寿命.
- 为了减轻与传统替代电解质相关的问题.
主要方法:
- 在以太溶剂中引入素作为电子吸收组,以提高氧化稳定性.
- 利用素和以太氧的合结构与Li+保持溶解功率.
- 在NCM811阴极中采用基与过渡金属 (TM) 的结合,以减少催化反应.
- 形成稳定的阴极-电解质介面 (CEI) 和含有N的,富含LiF的固体-电解质介面 (SEI).
主要成果:
- 在100个循环中实现了稳定的金属阳极循环,具有98.4%的库伦比效率.
- 在200个循环后,4.3VNCM811阴极的容量保留了81.8%.
- 在无阳极囊细胞中表现出稳定的性能,在100个循环后保持76%的容量.
- 在没有阳极的袋式电池中达到397.5Wh kg-1的高能量密度.
结论:
- 以素为基础的电解质显著提高了金属电池的氧化稳定性和性能.
- 电解质设计有效地抑制了电解质分解,并确保了正极的结构完整性.
- 开发的电解质使下一代电池具有长期循环稳定性和高能量密度.
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