在Na3V2(PO4)2O2F中协同作用的Mn-Cr联合剂 有希望的阴极:为下一代离子电池释放优越的性能
Mohammad Zaid1, Masiyappan Karuppusamy2, Biplab Patra3
1Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, 502284, India.
Small (Weinheim an der Bergstrasse, Germany)
|July 9, 2025
概括
与和一起配合化酸和,增强了其导电性和离子扩散. 这种优化的正极材料证明了下一代电池的容量保留和稳定性得到了改进.
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
- 固态化学 固态化学
背景情况:
- 化酸 (Na3V2O2(PO4) 2F,NVOPF) 是一个有前途的NASICON阴极材料,具有高电压和理论能量密度.
- 限制包括电子导电性差,实用能量密度低,阻碍商业化.
研究的目的:
- 通过解决其导电性和离子扩散限制,提高NVOPF的电化学性能.
- 调查和Cr联合兴奋剂对纳西康结构和离子传输特性的影响.
主要方法:
- 一种单溶热方法被用于合成Mn和Cr联合的NVOPF.
- 密度函数理论 (DFT) 的计算用于分析格子扭曲和离子扩散.
- 进行了电化学测试,包括循环性能,速率能力和全细胞评估.
主要成果:
- 优化的Na3V1.9Mn0.095Cr0.005O2PO4) 2F (NVMC-95) 显示出改善的离子和电子导电性.
- NVMC-95表现出卓越的循环稳定性 (在1C下500个循环后94%的保留率) 和速率能力 (87mAhg-1在20C).
- 针对硬碳的全电池测试显示了高工作电压和100个周期的持续容量.
结论:
- /联合剂有效地增强了Na+运输,降低阻抗,并改善了NVOPF阴极的动力学.
- 协同兴奋剂的协同效应导致稳定的纳西康结构,周期寿命延长.
- 这项工作提出了一个可行的策略,用于开发耐用和高性能纳西康类型的阴极材料,用于离子电池.
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