具有中等离子结合强度的潜在定制的-反应剂能够实现精确但快速的硬碳预化
Haining Chen1, Jiwei Shi1, Bohan Zhang1
1Shenzhen Key Laboratory for Graphene-based Materials, Key Laboratory of Electrocatalytic Materials and Green Hydrogen Technology of Guangdong Higher Education Institutes, Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
使用-化合物的新化方法,在离子电池 (SIB) 中的硬碳阳极中实现了高初始库伦比效率 (ICE). 这种快速而精确的技术可以提高电池的性能和稳定性.
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:
- 硬碳 (HCs) 是对离子电池 (SIBs) 的有希望的阳极.
- 由于不可逆转的损失,煤炭衍生HCs具有低可逆容量和低初始库伦比效率 (ICE).
- 现有的预化方法不准确,速度慢,并且可以形成不稳定的副产品.
研究的目的:
- 为SIB中的HC阳极开发一种高精度,快速的预化方法.
- 建立基于热力学驱动力和离子转移动力学的预化剂的双描述器设计原则.
- 为了提高SIB的ICE和自行车稳定性.
主要方法:
- 使用的- (Ar-Na) 化合物溶于四基 (THF) 中进行预化.
- 控制潜力和Ar-Na结合能量以优化前化过程.
- 建立了一个双描述器设计原理,使用氧化还原潜力和结合强度.
主要成果:
- 在60秒内达到~100%的ICE. 酸 (Ph-Na) 在60秒内达到~100%的ICE.
- 促进了超薄,富含无机的固体电解质介相 (SEI) 层的形成.
- 预先化HC的可逆容量为308.9 mAh g-1,SIB在350个循环后显示出94.8%的ICE和82.6%的容量保留.
结论:
- 拟议的Ar-Na预化策略提供了高精度和速度.
- 双描述子原理使得有效的前化剂设计成为可能.
- 展示了用于实际SIB应用的可扩展方法.
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