准固态电池的电化学性能和微观结构演变,由火花等离子体烧结制备
Jianghao Li1, Huan Tong1, Wenjiao Zhou1
1State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, P. R. China.
ACS applied materials & interfaces
|February 5, 2024
概括
固态电池由于界面微观结构的变化而降解. 裂变和相间层的形成会破坏离子运输,导致这些先进的储能系统的性能损失.
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:
- 固态电池为电动汽车提供高能量密度和安全性.
- 保持稳定的固体-固体接口对于离子和电子运输至关重要.
- 自行车上的界面进化阻碍了基本的理解和性能.
研究的目的:
- 为了研究准固态电池中固体-固体接口的微结构演变.
- 为了将界面变化与循环过程中的电化学性能退化相关联.
- 确定导致固态电池性能下降的关键因素.
主要方法:
- 使用火花等离子烧结制造一个准固态电池的制造.
- 电化学评估,包括容量保留和内部电阻测量.
- 使用扫描电子显微镜 (SEM),高分辨率传输电子显微镜 (HRTEM) 和选区电子衍射 (SAED) 的微结构和相位分析.
主要成果:
- 电池的初始容量为~150 mAh g-1,随后发生严重的容量衰减和电阻增加.
- SEM显示,随着循环,接口和固态电解质内部的裂纹增加.
- HRTEM/SAED鉴定了由于阴极体积变化,电解质粒膨胀和固体电解质介相 (SEI) 层形成 (Li2CO3,LiF,LiTFSI) 的裂纹形成.
结论:
- 微结构的演变,包括裂和SEI形成,直接导致固态电池的性能下降.
- 在LiFePO4阴极和Li15Al0.5Ge1.5(PO4) 3电解质的体积变化有助于界面不稳定.
- 了解这些界面现象对于设计耐用的固态电池至关重要.
关键词:
1.5Al0.5Ge1.5(PO4)3 1.5Al0.5Ge1.5 ((PO4)3) 1.5Al0.5Ge1.5 ((PO4)3) 1.5) 1.5) 1.5) 1.5) 1.5) 1.6 1.6 1.6 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.8 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 1.8 1.7 1.7 1.7 1.8 1.7 1.7 1.8 1.8 1.7 1.8 1.8 1.7 1.8 1.8 1.8 1.8 1.7 1.8 1.8 1.7 1.8 1.8 1.7电化学性能 电化学性能 电化学性能接口特征 接口特征在火花等离子烧结过程中,火花等离子烧结.结构 结构 演化 演化 演化
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