Abstract
Separators play a critical role in the safety and performance of lithium-ion batteries.However,com-mercial polyolefin separators are limited by their poor affinity with electrolytes and low melting points.In this work,we constructed a reinforced-concrete-like structure by homogeneously dispersing nano-Al2O3 and cellulose on the separators to improve their stability and performance.In this reinforced-concrete-like structure,the cellulose is a reinforcing mesh,and the nano-Al2O3 acts as concrete to support the separator.After constructing the reinforced-concrete-like structure,the separators exhibit good stability even at 200 ℃(thermal shrinkage of 0.3％),enhanced tensile strain(tensile stress of 133.4 MPa and tensile strains of 62％),and better electrolyte wettability(a contact angle of 6.5°).Combining these advantages,the cells with nano-Al2O3@cellulose-coated separators exhibit stable cycling performance and good rate performance.Therefore,the construction of the reinforced-concrete-like structure is a promising technology to promote the application of lithium-ion batteries in extreme environments.
基金项目
Natural Science Foundation of China(22278150)
Natural Science Foundation of China(22075086)
Natural Science Foundation of China(22138005)
Natural Science Foundation of China(22141001)
Guangdong Basic and Applied Basic Research Foundation(2022A1515010980)
Guangdong Basic and Applied Basic Research Foundation(2023A1515010046)
Fundamental Research Funds for the Central Universities(2022ZYGXZR101)
NETL
NSTL
万方数据