在离子电池中分层过渡金属氧化物阴极中的平静固体溶液
Meng Ren1, Shuo Zhao1, Suning Gao1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China.
Journal of the American Chemical Society
|December 23, 2022
概括
一种新的正极材料使离子电池 (SIB) 能够稳定地进行固体溶液反应,克服了二相转换中常见的结构问题. 这种设计提高了高级SIB的循环稳定性和速度性能.
科学领域:
- 固态电化学
- 材料科学
- 储能方式
背景情况:
- 固态电化学中的二相反应通常会导致结构降解.
- 在离子电池 (SIB) 中,大量的离子插入/提取会导致应变,裂和容量衰减.
- 多层阴极材料对于SIB至关重要,但在结构稳定性方面面临挑战.
研究的目的:
- 对于SIB来说,在一个分层的正极材料中研究一个稳态固体溶液反应.
- 在离子循环过程中改善结构稳定性的机制.
- 为高性能SIB设计先进的阴极材料.
主要方法:
- 分层阴极材料P'2-Na0.653Ni0.081Mn0.799Ti0.120O2的合成和表征
- 电化学测试以评估循环稳定性和速度性能.
- 使用先进技术 (隐含) 分析化和脱过程中的结构变化.
主要成果:
- 在P'2-Na0.653Ni0.081Mn0.799Ti0.120中实现了稳态固体溶液反应.
- 协同的Ni和Ti结合加强了O2p-Mn3d-e混合,减轻了Jahn-Teller扭曲.
- 该材料表现出极好的循环稳定性 (在500个循环后保持87.2%) 和速率能力 (100.5mAhg-1在2500mAg-1).
结论:
- 与二相反应相比,固溶液反应途径提供了更高的结构完整性.
- 这种方法为SIB设计稳定和高性能阴极材料提供了新的策略.
- 这些发现为下一代离子储能解决方案铺平了道路.
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