首页|Tackling application limitations of high-safety γ-butyrolactone electrolytes:Exploring mechanisms and proposing solutions

Tackling application limitations of high-safety γ-butyrolactone electrolytes:Exploring mechanisms and proposing solutions

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Developing wide-temperature and high-safety lithium-ion batteries(LIBs)presents significant challenges attributed to the absence of suitable solvents possessing broad liquid range and non-flammability prop-erties.γ-Butyrolactone(GBL)has emerged as a promising solvent;however,its incompatibility with gra-phite anode has hindered its application.This limitation necessitates a comprehensive investigation into the underlying mechanisms and potential solutions.In this study,we achieve a molecular-level under-standing of the perplexing interphase formation process by employing in-situ spectroelectrochemical techniques and density function calculations.Our findings reveal that,even at high salt concentrations,GBL consistently occupies the primary Li+solvation sheath,leading to extensive GBL decomposition and the formation of a high-impedance and inorganic-poor solid-electrolyte interphase(SEI)layer.Contrary to manipulating solvation structures,our research demonstrates that the utilization of film-forming additives with higher reduction potential facilitates the pre-establishment of a robust SEI film on the graphite anode.This approach effectively inhibits GBL decomposition and significantly enhances the battery's lifespan.This study provides the first reported intrinsic understanding of the unique GBL-graphite incompatibility and offers valuable insights for the development of wide-temperature and high-safety LIBs.

γ-Butyrolactone/Graphite incompatibilityUnique solvation structureSEI filmLithium-ion batteries

Haojun Wu、Zhangyating Xie、Guanjie Li、Lei Zheng、Zhiwei Zhao、Jiarong He、Yanbin Shen、Jiahao Hu、Zhangquan Peng、Guiming Zhong、Lidan Xing、Weishan Li

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School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong,China

School of Chemical Engineering,Faculty of Sciences,Engineering and Technology,The University of Adelaide,SA 5005,Australia

i-Lab,CAS Center for Excellence in Nanoscience,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences,Suzhou 215123,Jiangsu,China

Laboratory of Advanced Spectroelectrochemistry and Li-ion Batteries,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs,Engineering Research Center of MTEES(Ministry of Education),Research Center of BMET(Guangdong Province),and Key Lab.of ETESPG(GHEI),South China Normal University,Guangzhou 510006,Guangdong,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of Chinathe"Scientist Studio Funding"from Tianmu Lake Institute of Advanced Energy Storage Technologies Co.,Ltd.,Dalian Supports High-LeDalian Institute of Chemical Physics21C Innovation Laboratory,Contemporary Ampere Technology LtdVacuum Interconnected Nanotech Workstation(Nano-X)Suzhou Institute of Nano-Tech and Nano-Bionics for ToF-SIMS characterization

21972049222721752022YFA15040022021RD14DICP I20221321C-OP-202208

2024

10.1016/j.jechem.2024.01.069

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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