Molecular Engineering Enabling High Initial Coulombic Efficiency and Rubost Solid Electrolyte Interphase for Hard Carbon in Sodium‐Ion Batteries

Author:

Sun Yu1,Hou Ruilin1,Xu Sheng1,Zhou Haoshen1,Guo Shaohua12ORCID

Affiliation:

1. College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid-State Microstructures Collaborative Innovation Centre of Advanced Microstructures Nanjing University Nanjing 210093 China

2. Lab of Power and Energy Storage Batteries Shenzhen Research Institute of Nanjing University Shenzhen 518000 P. R. China

Abstract

AbstractHard carbon (HC) as a potential candidate anode for sodium‐ion batteries (SIBs) suffers from unstable solid electrolyte interphase (SEI) and low initial Coulombic efficiency (ICE), which limits its commercial applications and urgently requires the emergence of a new strategy. Herein, an organic molecule with two sodium ions, disodium phthalate (DP), was successfully engineered on the HC surface (DP‐HC) to replenish the sodium loss from solid electrolyte interphase (SEI) formation. A stabilized and ultrathin (≈7.4 nm) SEI was constructed on the DP‐HC surface, which proved to be simultaneously suitable in both ester and ether electrolytes. Compared to pure HC (60.8 %), the as‐designed DP‐HC exhibited a high ICE of >96.3 % in NaPF6 in diglyme (G2) electrolyte, and is capable of servicing consistently for >1600 cycles at 0.5 A g−1. The Na3V2(PO4)3 (NVP)|DP‐HC full‐cell with a 98.3 % exceptional ICE can be cycled stably for 450 cycles, demonstrating the tremendous practical application potential of DP‐HC. This work provides a molecular design strategy to improve the ICE of HC, which will inspire more researchers to concentrate on the commercialization progress of HC.

Funder

National Natural Science Foundation of China

Science, Technology and Innovation Commission of Shenzhen Municipality

Basic and Applied Basic Research Foundation of Guangdong Province

Publisher

Wiley

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