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网格压力氧化氧化可以实现接近零的体积变化和超快的储存

Changyuan Guo^1,2, Qing He¹, Fang Liu^1,3

¹State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|September 15, 2025

概括

一种新型的晶格预应力氧化 (LP-NWO) 通过最大限度地减少体积变化,使电池中的储存超快. 这一突破为下一代快速充电应用提供了更好的容量保留和安全性.

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
电池技术电池技术

背景情况:

氧化对快速充电的离子电池充满希望,因为它具有快速的离子传输和安全性.
然而,固有的结构压力和在高充电率 (> 20C) 的容量保留不足限制了其性能.

研究的目的:

开发一种新的晶格预应力氧化 (Nb14W3O44,LP-NWO) 材料.
为了克服快充离子电池的结构应力和低容量保留的局限性.

主要方法:

通过交替矩形单位和八面体扭曲,设计了一个晶格前应力结构 (LP-NWO).
在插入/提取过程中使用格子边缘演化研究了材料的结构反应.
评估了电化学性能,包括在高速率 (高达100°C) 和循环寿命下保持容量.

主要成果:

由于减轻了应变,LP-NWO结构在循环过程中表现出接近零的体积变化.
在20,000个循环后在100C达到78%的容量保留,在50C的完整电池中超过2000个循环.
在严重的压力条件下没有证明安全风险.

结论:

格子预压战略有效地减轻了结构应力,使得的超快速储存成为可能.
LP-NWO为开发高性能快充电池的零应变电极提供了一条可行的途径.
这种内部压力管理方法对克服快速充电的局限性有重大影响.

关键词:

曲线直线的格子边缘.快速充电器可以快速充电格子前应力压力前应力接近零的体积变化.的氧化氧化.

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