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4.5-V级安全的离子电池,具有通过自我限制的相间电位启用的-多数-石墨阳极

Longji Xu¹, Xue Han², Jaekyung Sung³

¹Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.

Advanced materials (Deerfield Beach, Fla.)

|November 17, 2025

概括

一种新的混合硫胺电解质 (HSE) 能够使高压离子电池的稳定运行,其中占多数的石墨阳极. 这种电解质在上形成了自我限制的介相,增强了循环稳定性和安全性.

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
储能储能储能储能储能储能

背景情况:

使用4.5V级LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811) 阴极和多数石墨 (SmG) 阳极的高能离子电池 (LIB) 的能量密度超过400千克Wh^-1.
这些先进的LIB的主要挑战包括循环稳定性差,安全问题和低温性能有限,主要是由于难以形成稳定的介面相.
高电压和阳极的激进电化学环境需要新的电解质溶液.

研究的目的:

开发一种混合硫胺电解质 (HSE),能够承受高压NMC811阴极和阳极的恶劣条件.
在阳极上设计一个自我限制的无机互相,以提高电池的性能和寿命.
为了证明这种电解质在高能LIB中的实际应用.

主要方法:

一种新的混合硫胺电解质 (HSE) 被合成并测试.
研究了电解质与阳极的相互作用,重点是形成自我限制的介相.
电化学性能使用NMC811下载下载SmG硬币电池和1.4Ah袋式电池进行了评估,包括循环稳定性,温度范围和热稳定性测试.

主要成果:

该HSE成功地在高压NMC811的攻击性化学反应中幸存下来,并在Si阳极上编程了一个自我限制的无机互相.
采用HSE的NMC811下载下载SmG硬币电池在4.5V的500个循环后保持了80%的容量,并在-40°C至60°C之间有效运行.
1.4Ah袋式电池在1150个循环后显示出80.0%的容量保留,并表现出高达300°C的优异热稳定性.

结论:

开发的混合硫胺电解质为提高高能LIB的稳定性和安全性提供了可行的解决方案.
在阳极上自我限制的相间形成是实现先进电池系统中长周期寿命的关键策略.
这项工作为实用的电解质设计铺平了道路,旨在提高下一代离子电池的性能.

关键词:

在Si-多数石墨阳极.高电压的高电压的高电压自己限制的相间相位.硫胺酸硫胺的使用方法

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