Multipoint Anionic Bridge: Asymmetric Solvation Structure Improves the Stability of Lithium-Ion Batteries

Tianle Zheng; Tonghui Xu; Jianwei Xiong; Weiping Xie; Mengqi Wu; Ying Yu; Zhuijun Xu; Yuxin Liang; Can Liao; Xiaoli Dong; Yongyao Xia; Ya-Jun Cheng; Yonggao Xia; Peter Müller-Buschbaum

doi:10.1002/advs.202410329

Multipoint Anionic Bridge: Asymmetric Solvation Structure Improves the Stability of Lithium-Ion Batteries

Adv Sci (Weinh). 2024 Oct 30:e2410329. doi: 10.1002/advs.202410329. Online ahead of print.

Authors

Tianle Zheng¹, Tonghui Xu^{2

3}, Jianwei Xiong⁴, Weiping Xie², Mengqi Wu², Ying Yu⁵, Zhuijun Xu¹, Yuxin Liang¹, Can Liao⁶, Xiaoli Dong⁷, Yongyao Xia^{4

7}, Ya-Jun Cheng^{2

8}, Yonggao Xia^{2

9}, Peter Müller-Buschbaum¹

Affiliations

¹ Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.
² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang, 315201, P. R. China.
³ Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, P. R. China.
⁴ College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China.
⁵ AIE Institute, Guangdong, 510530, P. R. China.
⁶ College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, P. R. China.
⁷ Department of Chemistry, Institute of New Energy, Fudan University, Shanghai, 200433, P. R. China.
⁸ College of Renewable Energy, Hohai University, Jiangsu, 213220, P. R. China.
⁹ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

PMID: 39476846
DOI: 10.1002/advs.202410329

Abstract

In this study, a novel concept of multipoint anionic bridge (MAB) is proposed and proved, which utilizes anions with different sites to connect with the asymmetric solvation structure (ASS). Compared to usual solvation structures, this study utilizes the multifunctional groups of difluoro(oxalate)borate anion (ODFB^-), which can connect with Li⁺. By tailoring the concentration, the anion serves as a bridge between different solvated structures. The electrolyte is investigated through in situ techniques and simulations to draw correlations between different solvation structures and reaction pathways. The proposed design demonstrates remarkable high-temperature performance on both the anode and cathode sides, enabling stable cycling of LCO||graphite (0.5 Ah, 1.0 C) pouch cell for over 200 cycles at 80 °C and facilitating Li||MCMB and Li||LFP cells to deliver stable performance for 200 cycles at 100 °C. This work paves the way for the development of high-performance electrolyte systems by designing and using new multipoint anions to construct ASSs.

Keywords: asymmetric solvation structure; high temperature; high‐concentration electrolyte; lithium difluoro(oxalate)borate; lithium metal batteries.

Abstract

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