Solvent-Assisted Hopping Mechanism Enables Ultrafast Charging of Lithium-Ion Batteries

Xiaoteng Huang, Ruhong Li, Chuangchao Sun, Haikuo Zhang, Shuoqing Zhang, Ling Lv, Yiqiang Huang, Liwu Fan, Lixin Chen, Malachi Noked, Xiulin Fan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Fast charging is regarded as one of the most coveted technologies for commercial Li-ion batteries (LIBs), but the lack of suitable electrolytes with sufficient ionic conductivity and effective passivation properties hinders its development. Herein, we designed a mixed-solvent electrolyte (1 M LiPF6in fluoroethylene carbonate/acetonitrile, FEC/AN, 7/3 by vol.) to overcome these two limitations by achieving an FEC-dominated solvation structure and an AN-rich environment. The specific AN-assisted Li+hopping transport behavior shortens the Li+diffusion time, doubling the ionic conductivity to 12 mS cm-1, thus endowing the graphite anode with >300 mAh g-1at 20C and reversible (de)intercalation over a wide temperature range (from -20 to +60 °C). Furthermore, the designed electrolyte triples the capacity of the 1 Ah graphite||LiNi0.8Mn0.1Co0.1O2(NMC811) pouch cells at 8C in comparison with the commercial electrolyte. The solvent-assisted hopping mechanism maximizes the fast-charging capability of the electrolytes, which motivates further research toward viable next-generation high-energy LIBs.

Original languageEnglish
Pages (from-to)3947-3957
Number of pages11
JournalACS Energy Letters
Issue number11
StatePublished - 11 Nov 2022

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