DataVXACS Energy LettersPaper
journal article·2026-07-02

Solvation Stabilization via Non-Coordinating Benzotrifluoride for High-Voltage Sodium-Ion Batteries

Zhiyuan Cheng, Bowen Zhu, Jiahao Xing, Yanbo Zhang, Yamiao Liu, Zimo Huang, Hongshuai Hou, Yanqing Lai, Jie Li, Simin Li, Xiaobo Ji

ACS Energy Letters
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Source abstract

Abstract

Developing high-energy sodium-ion batteries (SIBs) with layered cathodes at elevating voltage is hindered by the trade-off between the oxidative resistance and the sluggish ion kinetics of viscous fluorinated electrolytes. Here, we introduce benzotrifluoride (BTF) as a non-coordinating diluent in a fluorinated carbonate electrolyte to regulate the solvation structure. Through steric and dipolar effects, BTF promotes the participation of fluorinated carbonates in the primary solvation sheath while retaining controlled anion involvement. This reconstructed solvation environment simultaneously accelerates bulk ion transport and facilitates the formation of a robust, fluorine-rich cathode electrolyte interphase (CEI), enabling oxidative resistance beyond 5 V and optimized ionic conductivity. When adapting this electrolyte, the NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) cathode delivers a discharge capacity of 147.6 mAh g −1 at 4.2 V with improved cycling stability compared to baseline fluorinated electrolytes. This work demonstrates the efficacy of aromatic diluent-mediated solvation engineering for SIBs.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Metallurgy and Environment

Central South University

National Engineering Research Center of Low-carbon Nonferrous Metallurgy, National Energy Metal Resources and New Materials Key Laboratory, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy

Engineering Research Center of the Ministry of Education for Advanced Battery Materials

College of Chemistry and Chemical Engineering, National Energy Metal Resources and New Materials Key Laboratory, State Key Laboratory of Powder Metallurgy

Funding

China Association for Science and Technology Young Talent Support Project · Huxiang Youth Talent Support Program of Hunan Province · Hunan Provincial Key Research and Development Program · Youth Natural Science Foundation of Hunan, China · Research Foundation of Education Bureau of Hunan, China · National Natural Science Foundation of China (NSFC)

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