设计一个超离子导体表面,使高稳定层氧化物阴极的快速Na+运输动力学成为可能
Yawei Zhang1, Min Guo1, Yi Ding1
1Institute of New Energy, School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.
Journal of colloid and interface science
|September 21, 2024
概括
在分层氧化物阴极 (NFM) 上使用酸 (NVP) 的新表面涂层策略,通过防止接口降解,提高了离子电池的稳定性和快速充电能力.
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:
- 可充电离子电池由于不稳定的接口和副作用反应而面临层叠氧化物阴极的挑战,限制快速充电和长期循环.
- 阴极/电解质间相的降解导致结构不稳定性和容量衰减,特别是在高运行电位下.
研究的目的:
- 开发O3型分层NaNi1 / 3Fe1 / 3Mn1 / 3O2 (NFM) 阴极的表面修改策略,以提高快速充电和循环期间的稳定性.
- 调查使用超离子导体Na3V2(PO4)3 (NVP) 作为结合剂来稳定NFM阴极接口.
主要方法:
- 采用了表面涂层策略,将NVP粘合到NFM阴极材料上.
- 评估了电化学性能,包括速率能力,初始库伦比效率和周期稳定性,直至高切断电压.
- 分析了修改后的阴极的界面特性和结构完整性.
主要成果:
- 该NVP涂层有效地抑制了NFM阴极的电解质腐蚀和近表面解构.
- 复合NFM@NVP电极表现出增强的相变可逆性和减少过渡金属溶解.
- NFM@NVP阴极表现出高初始库伦比效率 (95.5%在0.1°C),优异的速率能力 (100mAhg-1在20°C),以及显著的周期稳定性 (在2°C下500个周期后80%的容量保留).
结论:
- 离子电池的NVP粘接表面策略是一种简单且通用的方法,可以提高离子电池的分层氧化物阴极的相间稳定性.
- 这种方法显著提高了电化学性能,使得快速充电和长期循环用于可持续的储能应用.
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