构建基于Fe/Mn的分层氧化物阴极的P2/O3双相结构,用于高性能离子电池
Ping Zhang1, Guohua Zhang1, Yukun Liu1
1Institute of New Energy for Vehicles, Shanghai Key Laboratory of Development & Application for Metallic Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
Journal of colloid and interface science
|November 2, 2023
概括
开发稳定的离子电池 (SIB) 是至关重要的. 这项研究表明,基于Fe/Mn的分层氧化物中的P2/O3双相结构显著改善了SIB阴极的循环稳定性.
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:
- 基于Fe/Mn的分层氧化物对离子电池 (SIB) 是有前途的,因为其容量大,成本低.
- 低循环稳定性仍然是这些材料的关键挑战.
- 优化阴极结构对于提高SIB性能至关重要.
研究的目的:
- 为SIB阴极合成P2/O3双相分层氧化物.
- 为了研究铜 (Cu) 替代对相位转换的影响.
- 为了评估双相材料的电化学性能和循环稳定性.
主要方法:
- 盐-凝合成的Na0.67Fe0.425Mn0.425Cu0.15O2. 这是一个非常简单的方法.
- 使用现场X射线衍射 (XRD) 进行表征.
- 在100个周期内以1C的速度对硬币电池进行电化学测试.
主要成果:
- Cu的替代促进了P2到O3的相位转换,产生了P2/O3复合结构.
- 该P2/O3结构使可逆相位过渡,并减少了离子插入/提取期间的格子不匹配.
- 两相电极在100个循环后实现了87.1%的容量保留,超过单相P2电极 (36.4%的保留).
结论:
- 构建P2/O3双相结构是改善Fe/Mn基层氧化物阴极循环稳定的有效策略.
- 这种方法提高了电池运行期间相变的可逆性和结构完整性.
- 这些发现为开发高性能和耐用的离子电池铺平了道路.
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