Kehan Le , Chunchun Sang , Qijun Luo , Hui Li , Yongjin Fang , Xinping Ai
{"title":"具有温度可切换中间层的阴极,用于热自动调节智能锂离子电池","authors":"Kehan Le , Chunchun Sang , Qijun Luo , Hui Li , Yongjin Fang , Xinping Ai","doi":"10.1016/j.etran.2025.100483","DOIUrl":null,"url":null,"abstract":"<div><div>Thermal safety is crucial for the large-scale application of lithium-ion batteries (LIBs) in electric vehicles and energy storage stations. To boost thermal safety of LIBs, we propose herein a reversible temperature-responsive membrane (RTRM) and use this membrane as surface-modification layer of current collector to develop temperature-responsive cathodes. The RTRM is fabricated by uniformly dispersing conductive fillers of short-cut carbon fibers (CCFs) in a blended plastic matrix of low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE) through solution casting. Benefiting from the large thermal expansion provided by LDPE and good structural reproducibility given rise by the ultra-high melt viscosity of UHMWPE, the as-fabricated RTRM exhibits a strong and reversible positive temperature coefficient (PTC) effect, with its resistivity increasing sharply by 7.1 orders of magnitude at 110–120 °C and returning to the initial value reversibly upon cooling down even after 30 thermal cycles. As a result, the LiFePO<sub>4</sub> cathode with the RTRM demonstrates a reversible temperature-switching behavior by spontaneously halting the electrode reaction at elevated temperatures and resuming the electrode reaction upon cooling, thereby providing reversible thermal protection for LIBs. Notably, such a temperature-switchable cathode maintains normal charge-discharge performance even after 28 thermal on/off cycles. This study offers a promising strategy for developing temperature-responsive cathode and thermally self-regulating smart LIBs.</div></div>","PeriodicalId":36355,"journal":{"name":"Etransportation","volume":"26 ","pages":"Article 100483"},"PeriodicalIF":17.0000,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Cathode with a temperature-switchable interlayer for thermally self-regulating smart lithium-ion batteries\",\"authors\":\"Kehan Le , Chunchun Sang , Qijun Luo , Hui Li , Yongjin Fang , Xinping Ai\",\"doi\":\"10.1016/j.etran.2025.100483\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Thermal safety is crucial for the large-scale application of lithium-ion batteries (LIBs) in electric vehicles and energy storage stations. To boost thermal safety of LIBs, we propose herein a reversible temperature-responsive membrane (RTRM) and use this membrane as surface-modification layer of current collector to develop temperature-responsive cathodes. The RTRM is fabricated by uniformly dispersing conductive fillers of short-cut carbon fibers (CCFs) in a blended plastic matrix of low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE) through solution casting. Benefiting from the large thermal expansion provided by LDPE and good structural reproducibility given rise by the ultra-high melt viscosity of UHMWPE, the as-fabricated RTRM exhibits a strong and reversible positive temperature coefficient (PTC) effect, with its resistivity increasing sharply by 7.1 orders of magnitude at 110–120 °C and returning to the initial value reversibly upon cooling down even after 30 thermal cycles. As a result, the LiFePO<sub>4</sub> cathode with the RTRM demonstrates a reversible temperature-switching behavior by spontaneously halting the electrode reaction at elevated temperatures and resuming the electrode reaction upon cooling, thereby providing reversible thermal protection for LIBs. Notably, such a temperature-switchable cathode maintains normal charge-discharge performance even after 28 thermal on/off cycles. This study offers a promising strategy for developing temperature-responsive cathode and thermally self-regulating smart LIBs.</div></div>\",\"PeriodicalId\":36355,\"journal\":{\"name\":\"Etransportation\",\"volume\":\"26 \",\"pages\":\"Article 100483\"},\"PeriodicalIF\":17.0000,\"publicationDate\":\"2025-09-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Etransportation\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2590116825000906\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Etransportation","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590116825000906","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Cathode with a temperature-switchable interlayer for thermally self-regulating smart lithium-ion batteries
Thermal safety is crucial for the large-scale application of lithium-ion batteries (LIBs) in electric vehicles and energy storage stations. To boost thermal safety of LIBs, we propose herein a reversible temperature-responsive membrane (RTRM) and use this membrane as surface-modification layer of current collector to develop temperature-responsive cathodes. The RTRM is fabricated by uniformly dispersing conductive fillers of short-cut carbon fibers (CCFs) in a blended plastic matrix of low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE) through solution casting. Benefiting from the large thermal expansion provided by LDPE and good structural reproducibility given rise by the ultra-high melt viscosity of UHMWPE, the as-fabricated RTRM exhibits a strong and reversible positive temperature coefficient (PTC) effect, with its resistivity increasing sharply by 7.1 orders of magnitude at 110–120 °C and returning to the initial value reversibly upon cooling down even after 30 thermal cycles. As a result, the LiFePO4 cathode with the RTRM demonstrates a reversible temperature-switching behavior by spontaneously halting the electrode reaction at elevated temperatures and resuming the electrode reaction upon cooling, thereby providing reversible thermal protection for LIBs. Notably, such a temperature-switchable cathode maintains normal charge-discharge performance even after 28 thermal on/off cycles. This study offers a promising strategy for developing temperature-responsive cathode and thermally self-regulating smart LIBs.
期刊介绍:
eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation.
The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment.
Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.