协同的双添加电解质使金属电池具有高度稳定的性能
Phung M L Le1,2, Thanh D Vo1,3, Kha M Le1
1Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
Small (Weinheim an der Bergstrasse, Germany)
|May 25, 2024
概括
双重添加剂硫 (Sul) 和乙烯碳酸盐 (VC) 显著提高金属电池 (SMB) 的稳定性. 这一突破阻止了树的生长,并延长了大规模储能应用的周期寿命.
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:
- 金属电池 (SMB) 具有较高的理论容量和丰富的资源,使其成为大规模能源存储的前景.
- 电解质稳定性有限和树成长仍然是阻碍中小企业商业化的重大挑战.
研究的目的:
- 确定有效的电解质添加剂,以稳定中小企业的碳酸 (PC) 电解质.
- 通过防止树形成和增强接口特性,提高中小企业的循环稳定性和寿命.
主要方法:
- 研究了硫 (Sul) 和乙烯碳酸盐 (VC) 作为用于中小企业的PC电解质中的双添加剂的使用.
- 在高循环速率下评估了Na/NaNi0.68Mn0.22Co0.1O2 (NaNMC) 电池与双添加剂电解质的电化学性能.
- 在阳极和阴极上分析了固体电解质介相 (SEI) 组成和形态.
主要成果:
- 双添加电解质显著提高了循环稳定性,在5°C (750 mA g-1) 的600个循环中实现了94%的容量保留.
- 库伦比效率 (CE) 达到99.9%,表明副作用最小,离子运输效率高.
- 一个均的,密集的,薄的混合SEI层,富含F-和S-含有的物种,形成在电极表面,促进离子运输和防止电解质耗尽.
结论:
- 硫和乙烯碳酸盐作为有效的双添加剂,对稳定PC电解质在中小企业至关重要.
- 形成一个保护性的混合SEI层是SMB的卓越循环性能和延长寿命的关键.
- 这种电解质设计具有很大的潜力,可以提高高速金属电池的性能和实际应用.
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