允许全固态二氧化碳电池在广泛的温度范围内运行.
Jianyun Zhao1,2, Yang Wang3, Hongyang Zhao1
1School of Chemistry, Engineering Research Center of Energy Storage Materials and Chemistry for Universities of Shaanxi Province, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, People's Republic of China.
ACS nano
|February 5, 2024
概括
灵活的全固态二氧化碳电池 (FASSLCBs) 显示出对更安全的能源存储有希望. 新型双连续层次的多孔结构改善了质量转移,并使室温运行成为可能,提高了循环稳定性.
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:
- 灵活的全固态二氧化碳电池 (FASSLCB) 与传统电池相比,提供了更高的安全性,并消除了穿效应.
- 目前的FASSLCB需要高温,因为质量转移缓慢,降解机制不清楚,这限制了它们的实际应用.
- 缓慢的固体-固体-气体多相质量转移和容量衰减是阻碍FASSLCB性能的主要挑战.
研究的目的:
- 在FASSLCB中为固体聚合物电解质和阴极设计双连续的层次性多孔结构 (BCHPS).
- 为了增强FASSLCBs.s.内的所有方向的质量转移.
- 阐明容量降解机制,提高FASSLCB的循环稳定性.
主要方法:
- 制造用于固体聚合物电解质和阴极的双连续层次多孔结构 (BCHPS).
- 孔隙结构的特征及其对盐解离和二氧化碳转化的影响.
- 研究电池容量降解机制,重点关注Li2CO3的形成和分解.
主要成果:
- BCHPS可方便所有连接方向的质量转移,并提供很大的易斯酸性表面积.
- 大的易斯酸性表面促进盐解离和二氧化碳转化,这对于电池运行至关重要.
- 能力降解被确定为"死Li2CO3"的形成,这是通过BCHPSs实现的快速Li2CO3分解来缓解的.
- 与没有BCHPS组装的FASSLCB相比,与BCHPS组装的FASSLCB相比,其循环稳定性长达2.7倍 (60°C的133个循环).
- 带有BCHPS的FASSLCB可以在室温下重复运行,这表明性能有了显著的改善.
结论:
- 开发的BCHPS方法有效地解决了质量转移限制,并促进了FASSLCB中的CO2转化.
- 了解和抑制"死Li2CO3"的形成是改善电池寿命的关键.
- 这种方法为设计在室温下可操作的高性能,长周期的FASSLCB提供了可行的策略.
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