SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 68 ›› Issue (4): 83-93.DOI: 10.1016/j.cjche.2023.07.015

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Nano-alumina@cellulose-coated separators with the reinforced-concrete-like structure for high-safety lithium-ion batteries

Zhihao Yang1, Li Chen1, Jian Xue1, Miaomiao Su1, Fangdan Zhang1, Liangxin Ding1, Suqing Wang1, Haihui Wang2   

  1. 1. Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
    2. Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2023-03-14 修回日期:2023-07-10 出版日期:2024-04-28 发布日期:2024-06-28
  • 通讯作者: Jian Xue,E-mail address:xuejian@scut.edu.cn;Haihui Wang,E-mail address:cehhwang@tsinghua.edu.cn
  • 基金资助:
    We gratefully acknowledge the funding from the Natural Science Foundation of China (22278150, 22075086, 22138005, and 22141001), the Guangdong Basic and Applied Basic Research Foundation (2022A1515010980, 2023A1515010046), and the Fundamental Research Funds for the Central Universities (2022ZYGXZR101).

Nano-alumina@cellulose-coated separators with the reinforced-concrete-like structure for high-safety lithium-ion batteries

Zhihao Yang1, Li Chen1, Jian Xue1, Miaomiao Su1, Fangdan Zhang1, Liangxin Ding1, Suqing Wang1, Haihui Wang2   

  1. 1. Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
    2. Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2023-03-14 Revised:2023-07-10 Online:2024-04-28 Published:2024-06-28
  • Contact: Jian Xue,E-mail address:xuejian@scut.edu.cn;Haihui Wang,E-mail address:cehhwang@tsinghua.edu.cn
  • Supported by:
    We gratefully acknowledge the funding from the Natural Science Foundation of China (22278150, 22075086, 22138005, and 22141001), the Guangdong Basic and Applied Basic Research Foundation (2022A1515010980, 2023A1515010046), and the Fundamental Research Funds for the Central Universities (2022ZYGXZR101).

摘要: Separators play a critical role in the safety and performance of lithium-ion batteries. However, commercial 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.

关键词: Alumina, Nanomaterials, Lithium-ion batteries, Membranes, Cellulose, Reinforced-concrete-like structure

Abstract: Separators play a critical role in the safety and performance of lithium-ion batteries. However, commercial 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.

Key words: Alumina, Nanomaterials, Lithium-ion batteries, Membranes, Cellulose, Reinforced-concrete-like structure