高容量纳西康型Na3V1.8Cr0.2PO4高性能离子电池的阴极
Jiawen Hu1, Zixing Chen1, Weixiao Ye1
1School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
ACS applied materials & interfaces
|July 30, 2025
概括
兴奋剂通过提高Na3V2(PO4) 3 (NVP) 阴极的导电性和容量来提高离子电池的性能. 优化的Na3V1.8Cr0.2(PO4)3 (NVCP-2) 显示出出色的电化学性能,证明了其在高性能离子电池中的潜力.
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) 对大规模储能充满希望.
- Na3V2(PO4) 3 (NVP) 是一种潜在的阴极材料,但其离子扩散和导电性较低.
- 兴奋剂是一种有效的策略,可以改善NVP的电化学特性.
研究的目的:
- 调查 (Cr) 兴奋剂对SIB应用中Na3V2(PO4) 3 (NVP) 的电化学性能的影响.
- 为了优化Cr兴奋剂度以提高性能.
- 评估Cr-doped NVP在液态和固态SIB中的潜力.
主要方法:
- 使用sol-gel合成制备Cr-doped NVP材料 (Na3V2-xCrx(PO4) 3).
- 使用诸如静电循环和速率能力测试等技术系统评估电化学性能.
- 分析了优化材料 (NVCP-2) 的结构和电化学特性.
主要成果:
- 发现最佳的Cr兴奋剂含量为x = 0.2,形成Na3V1.8Cr0.2(PO4) 3 (NVCP-2).
- 在较高的电压下,Cr兴奋剂激活了V4+/V5+氧化还原对,导致在0.1°C时达到221.6mAhg-1的高可逆容量.
- 与未吸毒的NVP相比,NVCP-2表现出了卓越的高速率能力 (120.0 mAh g-1在20°C) 和更好的循环稳定性.
- 在固态电池配置中也观察到有希望的结果.
结论:
- 兴奋剂显著提高了NVP的电子导电性和离子扩散动力学.
- 优化的NVCP-2阴极材料显示出高性能SIB的巨大潜力.
- 化的NVP是下一代储能设备的可行候选者,包括固态电池.
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