对于摇椅离子电容器的快离子导体涂层策略修改了LiMn2O4
Haoquan Li1, Nuo Chen1, Shangjun Zhang1
1Institute of Soft-Matter and Advanced Functional Materials, Carbon New Materials Industry Technology Center of Gansu Province, Key Laboratory of Special Function Materials and Structure Design of Ministry of Education, School of Materials and Energy, Lanzhou University, Lanzhou City, Gansu Province 730000, China.
ACS applied materials & interfaces
|March 29, 2025
概括
研究人员开发了一种涂有LiTaO3的LiMn2O4阴极材料,用于先进的离子电容器. 这种增强提高了循环寿命和电化学性能,使其适用于高密度储能应用.
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:
- 脊柱氧化 (LiMn2O4) 是一个有吸引力的阴极材料,由于其低成本和地球上丰富的氧化还原对.
- 表面降解和溶解限制了LiMn2O4.4的循环寿命.
- 摇椅离子电容器 (LIC) 需要稳定且高性能的正极材料.
研究的目的:
- 合成一个涂有LiTaO3的LiMn2O4阴极材料,以增强快速离子导电性.
- 为了评估改造的LiMn2O4作为摇椅离子电容器中的阴极的性能.
- 为了提高LiMn2O4的结构稳定性和电化学性能,用于长周期寿命应用.
主要方法:
- 合成涂上LiTaO3 (3TaLMO) 的LiMn2O4,以优化涂层厚度.
- 半电池中的3TaLMO材料的电化学表征.
- 使用3TaLMO和活性炭,组装和测试摇椅离子电容器.
主要成果:
- 3TaLMO复合材料表现出低阻抗和最高的离子扩散率.
- 半细胞测试显示了出色的循环稳定性,在0.3A g-1.0的2000个循环后保持了80.90%的容量.
- 摇椅LIC实现了高能量密度 (394.5Wh kg-1),高功率密度 (90kW kg-1),并在1.0A g-1.0的2000个周期后保持77.27%的容量.
结论:
- LiTaO3涂层有效地增强了LiMn2O4.4的结构稳定性和快速离子转移特性.
- 修改后的LiMn2O4显示出作为摇椅LIC的长周期寿命法拉基阴极材料的巨大潜力.
- 这种表面改造策略为开发先进的储能设备提供了一个有前途的途径.
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