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可逆的纳米晶相转换在Si基阳极中使稳定的全固态电池成为可能

Xuefeng Shen¹, Yihe Wang¹, Zirui Jiang¹

¹State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, China.

|June 30, 2025

概括

研究人员通过添加 (P) 和 (Zn) 来开发了一种用于固态电池的新型 (Si) 阳极. 这一策略提高了电池的稳定性和寿命,在NCM90全电池中实现了3000多个循环.

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:

基于硫化物的全固态电池与 (Si) 阳极提供高安全性和能量密度.
阳极遭受结构退化和缓慢的动力学,导致快速容量衰减和有限的电池寿命.
开发稳定和高容量的阳极对于推进下一代电池至关重要.

研究的目的:

为所有固态电池设计一种稳定,高容量的基于的阳极.
在电池循环过程中减轻结构降解和改善Si阳极的反应动力学.
为了提高固态电池的整体性能和循环寿命.

主要方法:

将酸盐 (P) 和 (Zn) 纳入 (Si) 基质中,以创建一个新的阳极材料.
用P和Zn修改的Si阳极的电化学特征.
在电池循环期间进行现场相变分析.
基于NCM90的全细胞的制造和测试,使用开发的阳极.

主要成果:

经P和Zn修改的Si阳极在循环过程中经历可逆的纳米晶相转换 (Li₁₅Si₄,LiZn,Li₃P),有效降低膨胀应力并保持结构完整性.
和酸盐的添加降低了离子扩散能量屏障和Si的带隙,增强了离子和电子传输.
使用新阳极的NCM90全细胞在2C速率下实现了3000多个周期的稳定循环.

结论:

可逆纳米晶相转换策略有效地解决了Si阳极的结构不稳定性和运动限制.
基于合金的阳极设计显著改善了基于硫化物完全固态电池的循环寿命和稳定性.
这种方法为开发高性能,持久的全固态电池提供了有前途的途径.

关键词:

如果阳极是Si阳极.所有固态电池都是固态电池.大规模制造业的大规模制造业纳米晶体相位转换过程

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