具有可逆多电子反应的NASICON型异质阴极,用于高性能离子电池
Lin Zhu1, Shuang Xiang1, Miaomiao Wang1
1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|September 9, 2024
概括
一种新的离子电池材料,Na4Fe3(PO4) 2(P2O7) /Na2VTi(PO4) 3 (NFPP/NVTP),实现了高容量和稳定性. 这一突破解决了NASICON类化合物的能量密度限制,以提高电池性能.
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:
- 离子电池 (SIB) 对电网规模的储能充满希望.
- 纳西康结构化合物提供强大的框架,但能量密度低,循环稳定性差.
- 在SIB阴极中实现同时的多电子反应和稳定循环仍然是一个重大挑战.
研究的目的:
- 为SIBs开发一种新的异质材料,克服现有的NASICON化合物的局限性.
- 通过协同方法提高能量密度和循环稳定性.
- 研究负责提高性能的电化学机制.
主要方法:
- 使用喷雾干燥技术合成一种新的异质Na4Fe3(PO4) 2(P2O7) /Na2VTi(PO4) 3 (NFPP/NVTP) 材料.
- 材料的结构,纯度和电化学性质的表征.
- 测试材料在半电池和全电池配置中的性能,用于离子电池.
主要成果:
- 优化的NFPP/NVTP材料在20 mA g-1下表现出155.3 mAh g-1的高可逆容量.
- 实现了卓越的循环稳定性,在2500个循环中以1Ag-1保持82.9%的容量.
- 在完整的电池配置中,保持了大约380Wh kg-1的高能量密度.
结论:
- 新型NFPP/NVTP材料与单个组件相比,表现出优越的电化学性能,解决了SIB阴极开发中的关键挑战.
- NFPP和NVTP之间的交生结构和协同效应增强了纯度,结晶和导电性,从而提高了容量和稳定性.
- 观察到的连续的降解/氧化机制和界面电荷再分配有助于材料的高性能和可逆的结构演变在储存期间.
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