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

doi:10.1021/acsenergylett.2c02240

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

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||LiNi_0.8Mn_0.1Co_0.1O₂(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 language	English
Pages (from-to)	3947-3957
Number of pages	11
Journal	ACS Energy Letters
Volume	7
Issue number	11
DOIs	https://doi.org/10.1021/acsenergylett.2c02240
State	Published - 11 Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Funding

This work was supported by the National Natural Science Foundation of China (22161142017, 22072134 and U21A2081), the Natural Science Foundation of Zhejiang Province (LZ21B030002), the Fundamental Research Funds for the Zhejiang Provincial Universities (2021XZZX010), the Fundamental Research Funds for the Central Universities (2021FZZX001-09), and the “Hundred Talents Program” of Zhejiang University. M.N. acknowledges the support of the Israel Science Foundation grant # 3494/21

Funders	Funder number
Fundamental Research Funds for the Zhejiang Provincial Universities	2021XZZX010
National Natural Science Foundation of China	U21A2081, 22161142017, 22072134
Israel Science Foundation	3494/21
Natural Science Foundation of Zhejiang Province	LZ21B030002
Zhejiang University
Fundamental Research Funds for the Central Universities	2021FZZX001-09

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title = "Solvent-Assisted Hopping Mechanism Enables Ultrafast Charging of Lithium-Ion Batteries",

abstract = "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.",

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

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AU - Zhang, Shuoqing

AU - Lv, Ling

AU - Huang, Yiqiang

AU - Fan, Liwu

AU - Chen, Lixin

AU - Noked, Malachi

AU - Fan, Xiulin

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N2 - 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.

AB - 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.

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

Abstract

Bibliographical note

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