Qian Yu , Wei Sun , Jialing Zhu , Haoxiang Li , Shuai Wang , Longqing Huang , Qian Qiu , Haoran Tian , He Miao , Fu Wang , Chunfei Zhang , Jinliang Yuan , Lan Xia
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引用次数: 0
Abstract
Battery safety is influenced by various factors, with thermal runaway being one of the most significant concerns. While most studies have concentrated on developing one-time, self-activating mechanism for thermal protection, such as temperature-responsive electrodes, and thermal-shutdown separators, these methods only provide irreversible protection. Recently, reversible temperature-sensitive electrolytes have emerged as promising alternatives, offering both thermo-reversibility and self-protective properties. However, further research is crucial to fully understand these thermal-shutdown electrolytes. In this study, we propose lower critical solution temperature (LCST) phase behavior poly(benzyl methacrylate)/imidazolium-based ionic liquid mixtures to prepare temperature-sensitive electrolytes that provide reversible thermal shutdown protection of batteries. This electrolyte features an appropriate protection temperature (∼105 °C) and responds quickly within a 1 min at 105 °C, causing cells to hardly discharge as the voltage suddenly drops to 3.38 V, and providing efficient thermal shutdown protection within 30 min. Upon cooling back to room temperature, the battery regains its original performance. Additionally, the electrolyte exhibits excellent cycling stability with the capacity retention of the battery is 91.6% after 500 cycles. This work provides a viable solution for preventing batteries from thermal runaway triggered by overheating.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy