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用于4.8V全固态电池的固体电解质中纳米粒子诱导的界面电场优化

Qingmei Xiao¹, Shiming Huang¹, Donghao Liang¹

¹Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, People's Republic of China.

Nano-micro letters

|September 1, 2025

概括

用铁电纳米颗粒涂覆化物固体电解质可增强离子导电性并抑制分解,从而实现稳定的高压全固态电池. 这一战略提高了下一代电池的循环稳定性和能量密度.

科学领域:

材料科学
电化学
固态化学

背景情况:

基于的固体电解质对高能量密度全固态电池 (ASSB) 是有前途的.
它们的低氧化分解值 (大约4.2V) 限制了在超高压系统 (例如4.8V) 中的应用.
寄生界面反应和电解质分解阻碍了ASSB的性能.

研究的目的:

为了提高高压ASSB的化物固体电解质的氧化稳定性和界面兼容性.
研究铁电BaTiO3纳米粒子涂层对Li2.5Y0.5Zr0.5Cl6 (LYZC) 电解质的影响.
提高4.8V运行的ASSB的循环稳定性和能量密度.

主要方法:

通过球磨,涂层 Li2.5Y0.5Zr0.5Cl6 (LYZC) 电解质与铁电 BaTiO3 (BTO) 纳米粒子 (厚度为 50-100 nm).
使用电化学阻抗光谱和循环电压测量来表征界面离子导电和电化学稳定性.
使用飞行时间二次离子质谱 (ToF-SIMS) 和X射线光电子谱 (XPS) 分析界面化学变化.
使用涂层 (LYZC@5BTO) 和原始LYZC电解质制造和测试ASSB电池.

主要成果:

LYZC@5BTO保持了高离子导电性 (1.06 mS cm-1).
BTO涂层有效地减轻了电压诱导的分解,并抑制了NCM811阴极的界面反应.
与原始LYZC (55.4 mAh g-1) 相比,使用LYZC@5BTO的ASSB电池显示出更好的放电能力 (95.4 mAh g-1超过1°C的200个周期).
在LYZC@5BTO中,表面副作用 (金属-O-Cl) 显著降低 (14%在200个循环后),而原始LYZC则降低 (26%在200个循环后).

结论:

铁电纳米粒子表面修饰是一种提高化物固体电解质电化学稳定的有效策略.
这种电场调制方法可以通过抑制界面降解来实现ASSB的高压操作.
开发的LYZC@5BTO电解质显示出商业化高能量密度,安全的全固态电池的巨大潜力.

关键词:

所有固态电池化物电解质铁电器 BaTiO3 高压稳定性表面的修改

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