解码极性梯度使得超高离子导电率成为可能
Yuqing Chen1,2, Aiping Wang3, Yun Zhao4
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China.
National science review
|February 12, 2026
概括
本研究介绍了离子电池的极性梯度工程 (PGE),通过减少电解质异质性来提高冷稳定性. 这一突破使得在极低温度下能够稳定运行,为先进的储能解决方案铺平了道路.
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:
- 传统的离子电池电解质在冷温度下由于溶解结构异质性而面临运行不稳定性.
- 在电解质中不平衡的溶剂极性导致高溶解障碍和增加的界面离子传输阻力.
- 这限制了电池在极寒环境中的性能和稳定性.
研究的目的:
- 引入一个极性梯度工程 (PGE) 范式,以解决电解质中的溶剂极性差异.
- 通过电子调制系统地解决原子尺度上的异质性.
- 为了使离子电池在极端冷条件下稳定运行.
主要方法:
- 在碳酸骨架中用硫代替碳,以减少介电异质.
- 原子级电子调制以实现平衡的Li+协调.
- 电解质性质的表征,包括介电异质性,溶解的激活能量和低温下的离子导电性.
主要成果:
- 通过在电解质中用硫代替碳 (Δε = 17.1) 来实现介电异质的83%降低.
- 同质化溶解加速了溶解动力学 (34.97 kJ·mol-1激活能量),并促进了富含LiF的相间形成.
- 优化的电解质使液体在-110°C下运行,在-80°C下具有1 mS·cm−1的导电性,在-20°C下可稳定循环运行LiCoO2/Li囊细胞 (81%的保留率超过400个循环).
结论:
- 极性梯度工程 (PGE) 范式有效地将电解质中的溶解结构同质化.
- 这导致了内在合的热力学稳定性和加速的界面动力学,用于极端条件的能量存储.
- 该研究提供了一个通用设计框架和一个原子规模的蓝图,用于开发高性能冷电池.
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