Anchoring and Competition: Weakly Solvated Structure of Glymes Enhances Stability in Lithium Metal Batteries Operating under Extreme Conditions
Abstract
AbstractLithium metal batteries (LMBs) face challenges from unstable and fragile solid electrolyte interphases (SEIs). In this work, we successfully develop a novel electrolyte by effectively modulating the competitive solvation process in LMBs. In this formulation, the C─O─C motifs of glymes are competitively substituted by other anions and solvents to achieve single oxygen site coordination, thereby facilitating a weak solvation effect. At an apparent concentration of 1.25 M, a solvated sheath enriched with anions and single oxygen‐bound complexes is formed, which significantly enhances lithium metal compatibility and promotes rapid desolvation kinetics. The designed electrolyte using weakly solvated structures exhibits remarkable stability at both 25° and 80 °C, enabling the lithium iron phosphate (LFP)||Li cell to achieve over 2000 cycles (capacity retention: 90%) and 500 cycles (capacity retention: 96%), respectively. Interestingly, the low N/P ratio LFP||Li (N/P = 1.8) full battery maintains a stable capacity over 50 cycles, and the commercial 1.1 Ah LFP||Li pouch cell shows a great stability (capacity retention: 91.0%, CE: 99.82%) over 20 cycles. The distinctive solvation regulation strategy has paved a novel research avenue for the realization of high‐performance LMBs.
Article Details
Authors (22)
Tianle Zheng
Mengqi Wu
Jianwei Xiong
Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 211106 P.R. China
Ming Yang
Wenzhe Guo
Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany
Qihan Zeng
Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany
Hongwei Yu
State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystals
Tonghui Xu
Weiping Xie
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd Ningbo Zhejiang Province 315201 P.R. China
Yiyao Xiao
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd Ningbo Zhejiang Province 315201 P.R. China
Zhuijun Xu
Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany
Yuxin Liang
Zerui Li
Ruoxuan Qi
Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany
Guangjiu Pan
TUM School of Natural Sciences, Chair for Functional Materials, Physics Department, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany
Xiaotang Shi
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd Ningbo Zhejiang Province 315201 P.R. China
Hongbin Zhao
Department of Chemistry and Institute for Sustainable Energy/College of Sciences
Xiaohong Li
Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry
Yongyao Xia
Ya‐Jun Cheng
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd Ningbo Zhejiang Province 315201 P.R. China
Yonggao Xia
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd Ningbo Zhejiang Province 315201 P.R. China
Peter Müller‐Buschbaum
TUM School of Natural Sciences Department of Physics Chair for Functional Materials Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany