热工程加速酸盐阴极的相变动力学,以实现超高速率的容量
Hui Guan1, Shuang Xiang1, Lin Zhu1
1Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P.R. China.
Small (Weinheim an der Bergstrasse, Germany)
|January 12, 2026
概括
这项研究引入了一种新的正极材料,Na3.5V1.35Mn0.5Al0.05Ni0.05Zr0.05(PO4) 3 / C (NVMANZP),用于离子电池 (SIB). 由于由驱动的机制,NVMANZP表现出增强的动力学和稳定性,使其成为高性能SIB的有希望的候选人.
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) 是离子电池的经济高效替代品.
- 纳西康型Na3.5V1.5Mn0.5(PO4) 3 (NVMP) 是一个有前途的SIB阴极材料.
- 由于NVMP运动缓慢,结构稳定性不佳,限制了其实际应用.
研究的目的:
- 为SIBs开发一种高性能阴极材料.
- 为了提高纳西康型材料的电化学性能.
- 调查多离子兴奋剂对NVMP的反应机制和稳定性的影响.
主要方法:
- 将Al,Ni和Zr的协同兴奋剂注入NVMP的过渡金属部位.
- 合成的Na3.5V1.35Mn0.5Al0.05Ni0.05Zr0.05(PO4) 3/C (NVMANZP). 这是一个非常好的方法.
- 电化学表征,包括速度能力和循环稳定性测试.
主要成果:
- NVMANZP表现出一种类似于固体溶液的反应机制,与原始NVMP的两相反应不同.
- 稳定机制降低了Na+迁移障碍,并最大限度地减少了Jahn-Teller应变.
- 在0.2C时,NVMANZP提供118.3 mAh g-1的高可逆容量,在100C时保持77.3 mAh g-1的高可逆容量.
- 该材料表现出极好的循环稳定性,在10°C的4000个循环后保持80.76%的容量保留.
- 使用NVMANZP的完整电池在0.2C时达到378Wh kg-1的能量密度.
结论:
- 多离子兴奋剂有效地将NVMP的反应机制转化为类似固体溶液的过程.
- 与原始NVMP相比,NVMANZP表现出优越的速度能力和长期循环稳定性.
- 由率驱动的机制对于定制NASICON阴极性能来实现高速,长寿命的SIB至关重要.
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