克服聚离子阴极的动力限制,实现高性能离子电池
Chunliu Xu1,2, Qiang Fu3, Weibo Hua3
1CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
ACS nano
|July 4, 2024
概括
研究人员开发了一种用于离子电池 (NIB) 的新阴极材料Na3(VOPO4) 2F. 这种材料显示出出色的容量和能量密度,即使在高速率下,也克服了NIB技术以前的局限性.
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:
- 由于其稳定性,聚离子阴极在离子电池 (NIB) 中受到研究.
- 现有的材料在快速储存时面临容量色和电压衰减.
- 纳米工程和碳涂层在改善这些正极材料方面取得了有限的成功.
研究的目的:
- 开发一种新的阴极材料,用于具有增强电化学性能的NIB.
- 为了解决聚离子阴极容量衰减和电压衰减的局限性.
- 为了研究新材料在不同NIB配置中的性能.
主要方法:
- 一种拓化学合成路径被用来制造Na3(VOPO4) 2F阴极材料.
- 该材料被设计成具有主要暴露的 {001} 活性面体,以缩短 Na 扩散通路.
- 电化学性能在非水性,水性和固态全NIB中进行了评估.
主要成果:
- Na3(VO4) 2F阴极在10°C下产生了129 mA hg-1的可逆容量,接近理论的132 mA hg-1.
- 实现了高能量密度 (~452 W h kg-1) 和功率密度 (4660 W kg-1).
- 该材料在各种NIB系统中表现出优异的电化学性能,这是由于有利的动力学.
结论:
- 设计的Na3(VOPO4) 2F阴极材料与暴露的面部显著提高了NIB的性能.
- 合理的几何结构设计增强了离子扩散,导致高速率的能力.
- 这种材料对各种电解质的先进离子电池应用具有前途.
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