温州大学李林研究小组取得一项新突破。他们用潜在溶剂诱导的富无机界面化学，在低浓度电解质中实现稳定钾离子电池。2024年12月5日出版的《德国应用化学》发表了这项成果。

低浓度电解质（LCEs）因其成本效益和低粘度而备受关注，但其富有机界面化学性质和氧化稳定性不佳。该研究提出了一种独特的潜在溶剂，1,2-二丁基乙烷（DBE），来操纵阴离子增强的溶剂化鞘，并在0.5 M的电解质中构建一个稳健的富无机界面。这种独特的溶剂化结构降低了溶剂化能，促进了快速的界面动力学和K⁺在石墨中的嵌入。

此外研究人员发现，增强的阴离子-阳离子相互作用促进了钾离子电池（PIBs）薄而坚固的界面层的形成，具有优异的循环性能。石墨||苝-3,4,9,10-四羧酸二酐全电池在300次循环后保持80.3%的良好容量，即使在500 mA g^-1下也能提供131.3 mAh g^-1的高放电容量。该研究证明了潜在溶剂优化电解质工程的可行性，为PIB提供了一条优越的电化学储能途径。

附：英文原文

Title: Latent solvent-induced inorganic-rich interfacial chemistry to achieve stable potassium-ion batteries in low-concentration electrolyte

Author: Qian Yang, Xunzhu Zhou, Tingting Huang, Zhuo Chen, Yu Zhang, Shuo Shi, Wen Zhang, Lin Li, Jiazhao Wang, Shixue Dou, Kaixiang Lei, Shijian Zheng

Issue&Volume: 2024-12-05

Abstract: Low-concentration electrolytes (LCEs) have attracted great attention due to their cost effectiveness and low viscosity, but suffer undesired organic-rich interfacial chemistry and poor oxidative stability. Herein, a unique latent solvent, 1,2-dibutoxyethane (DBE), is proposed to manipulate the anion-reinforced solvation sheath and construct a robust inorganic-rich interface in a 0.5 M electrolyte. This unique solvation structure reduces the desolvation energy, facilitating rapid interfacial kinetics and K+ intercalation in graphite. Additionally, enhanced anion-cation interactions promote the formation of a thin and robust interfacial layer with excellent cycling performance of potassium-ion batteries (PIBs). Graphite||perylene-3,4,9,10-tetracarboxylic dianhydride full cell exhibits a good capacity retention of 80.3% after 300 cycles, and delivers a high discharge capacity of 131.3 mAh g-1 even at 500 mA g-1. This study demonstrates the feasibility of latent solvent-optimized electrolyte engineering, providing a pathway of superior electrochemical energy storage in PIBs.

DOI: 10.1002/anie.202422259

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202422259