Peng Xinxing, Zhang Yun, Gong Wei, Zhou Jiangang, Ye Dezhan, Fan Lingling, Xu Jie
State Key Lab for Hubei New Textile Materials and Advanced Processing Technology, College of Materials Science & Engineering, College of Textile Science & Engineering, Wuhan Textile University, 430200 Wuhan, China.
State Key Lab for Hubei New Textile Materials and Advanced Processing Technology, College of Materials Science & Engineering, College of Textile Science & Engineering, Wuhan Textile University, 430200 Wuhan, China.
Int J Biol Macromol. 2025 Apr;302:140536. doi: 10.1016/j.ijbiomac.2025.140536. Epub 2025 Feb 1.
Cellulose nanofibers (CNFs) have received widespread attention in energy storage as an environmentally friendly and stable separator for lithium-ion batteries (LIBs). Polyaniline (PANI) is one representative kind of electroactive pseudocapacitance electrode material. In order to manufacture an electrochemically PANI-functionalized CNF separator which can increase the capacities of the LIBs, this work presents a novel redox-active Janus separator for LIBs incorporating an insulated bacterial cellulose (BC) nanofiber layer with a redox-active PANI layer. The PANI nanosheets synthesized via an emulsion polymerization method is easily covered on the BC layer by filtration, which could provide extra capacity of the LIBs due to the redox reactions of PANI during charge/discharge. The PANI@BC separator exhibits superior electrolyte compatibility and uptake capacity. The specific capacity of the battery paired with the PANI@BC separator, LiFePO, and Li metal can be increased to 129.6 mAh g at a current density of 2C. After 100 cycles at a current density of 2C, the capacity retention of the battery with the PANI@BC separator is about 90 %. Undoubtedly, this research provides valuable insights into developing novel functional separators for the improved performance of LIBs.
纤维素纳米纤维（CNFs）作为一种用于锂离子电池（LIBs）的环保且稳定的隔膜，在能量存储领域受到了广泛关注。聚苯胺（PANI）是一种具有代表性的电活性赝电容电极材料。为了制造一种能提高锂离子电池容量的电化学聚苯胺功能化纤维素纳米纤维隔膜，本文提出了一种新型的用于锂离子电池的氧化还原活性Janus隔膜，它由一个绝缘的细菌纤维素（BC）纳米纤维层和一个氧化还原活性聚苯胺层组成。通过乳液聚合法合成的聚苯胺纳米片通过过滤很容易覆盖在细菌纤维素层上，由于聚苯胺在充放电过程中的氧化还原反应，这可以为锂离子电池提供额外的容量。聚苯胺@细菌纤维素隔膜表现出优异的电解质兼容性和吸收能力。与聚苯胺@细菌纤维素隔膜、磷酸铁锂（LiFePO）和锂金属配对的电池在2C电流密度下的比容量可提高到129.6 mAh/g。在2C电流密度下循环100次后，使用聚苯胺@细菌纤维素隔膜的电池容量保持率约为90%。毫无疑问，这项研究为开发用于提高锂离子电池性能的新型功能隔膜提供了有价值的见解。
