Enhancing Stability and Safety of Commercial Solid‐State Lithium Batteries Through Ternary Eutectic Solvents for Solid‐State Electrolyte Interface Modification

材料科学 电解质 共晶体系 化学工程 锂(药物) 三元运算 准固态 电池(电) 电极 复合材料 微观结构 物理化学 化学 计算机科学 色素敏化染料 量子力学 医学 物理 工程类 内分泌学 功率(物理) 程序设计语言
作者
Kaixuan Zhou,Xinke Dai,Long Zhang,Hongtao Liu,Tong Li,X. Zhang,Jiawei Wen,Guoyong Huang,Shengming Xu
出处
期刊:Advanced Energy Materials [Wiley]
被引量:6
标识
DOI:10.1002/aenm.202402782
摘要

Abstract Solid‐state polymerized electrolytes exhibit advantageous properties, making them optimal candidates for next‐gen commercial solid‐state batteries. However, these electrolytes present significant challenges in terms of long‐term cycling stability, energy density, and safety. In this study, a ternary eutectic solid electrolyte (TESE) is prepared by combining deep eutectic solvents (DESs), polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP), and fluorinated ethylene carbonate (FEC). TESE also facilitates uniform lithium deposition, interfacial stability, and long‐cycle stability. N‐Methylacetamide in DESs preferentially occupies the lithium dissolution sheath, which in turn initiates a concentration gradient‐driven decomposition of FEC and stimulates the generation of inorganic solid electrolyte interphase (SEI) layers. The lithium metal and graphite soft pack full batteries are successfully assembled, demonstrating that Li/P‐0.8‐FEC/LFP exhibits excellent long‐cycle performance, with a capacity of 139.9 mAh g −1 after 500 cycles at 1 C 25 °C, accompanied by 97.8 % capacity retention. Furthermore, the Gr/P‐0.8‐FEC/LFP commercial solid‐state flexible pack full cell exhibits stable cycling performance at a high rate of 1 C. Moreover, the device exhibits remarkable safety in a series of rigorous safety tests, including 100 repeated bendings, pinning, 7100 N force extrusion, and cutting. The study results demonstrate that the electrolyte exhibits excellent cycling performance and safety characteristics, indicating significant potential for commercialization.
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