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通过谷物边界工程提高基于纳西康的电解质的树突耐受性

Wei Shan^1,2, Jiayu Chen^1,2, Xiaoyang Wei^1,2

¹The State Key Lab High Performance Ceram & Superfine, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.

ACS applied materials & interfaces

|September 26, 2025

概括

一个新的粒度边界修改策略增强了NASICON型陶,用于所有固态电池中的固态电解质. 这种方法提高了机械强度和离子导电性,使电池性能稳定,并抑制了树突的生长.

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
固态化学固态化学

背景情况:

纳西康型陶 (Na_1+xZr₂Si_xP_3-xO₁₂) 是所有固态电池 (ASSB) 的有希望的固态电解质 (SSEs).
颗粒边界特性显著影响SSE的性能和安全性.
开发具有高离子导电性和机械稳定的SSE对于实际的ASSB至关重要.

研究的目的:

建议和研究使用液体烧结的纳西康类陶的粒度边界修改策略.
为了提高Na_3.3Mg_0.15Zr_1.85Si₂PO₁₂ (MNZSP) 陶作为SSEs的性能.
改进SSEs的树抑制和机械性能,以获得更安全的ASSB.

主要方法:

使用Na₃AlF₆添加液体烧结方法.
谷物边界相的微观结构特征.
对称和全电池的电化学测试,包括临界电流密度 (CCD) 和循环稳定性测量.

主要成果:

添加Na₃AlF₆会在MNZSP陶中创建一个无形和纳米晶粒边界阶段.
这种修改增强了机械强度,并抑制了树的透.
在对称细胞中达到2.1 mA cm-2的高CCD和超过1200小时的循环稳定性.
完整的电池显示出高容量 (99.1 mAh g-1) 和稳定的循环200个周期.

结论:

通过液体烧结进行谷物边界修改是开发高性能SSE的有效策略.
增强的MNZSP陶显示了实用,高性能ASSB的巨大潜力.
这种方法为克服SSE开发更安全电池的关键挑战提供了一条途径.

关键词:

纳西康电解质的电解质没有树石.谷物边界的修改谷物边界的修改纳米晶体间颗粒阶段的纳米晶体.固态Na电池固态Na电池

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