细菌纤维素
纳米纤维
纤维素
复合数
锂(药物)
氧化还原
氧化纤维素
离子
化学
无机化学
材料科学
化学工程
高分子化学
纳米技术
有机化学
复合材料
医学
内分泌学
工程类
作者
Li Yang,Wei Du,Dezhan Ye,Jiangang Zhou,Weilin Xu,Jie Xu
标识
DOI:10.1016/j.ijbiomac.2024.131622
摘要
Separator is an essential component of lithium-ion batteries (LIBs), which is placed between the electrodes to impede their electrical contact and provide the transport channels for lithium ions. Traditionally, the separator contributes the overall mass of LIBs, thereby reducing the gravimetric capacity of the devices. Herein, a dual-layer redox-active cellulose separator is designed and fabricated to enhance the electrochemical performances of LIBs by introducing NiS. The presented separator is composed of an insulating bacterial cellulose (BC) nanofiber layer and a conductive, and redox-active NiS@BC/carbon nanotubes layer. By using the NiS@BC separator, the discharge capacity of the LiFePO4//Li half battery is enhanced to 117 mAh g-1 at a current of 2C owing to the redox-activity of NiS. Moreover, the functional separator-electrode interface can facilitate the homogenous Li stripping/plating and depress the polarization upon the repeated stripping/plating process. Consequently, the battery containing the redox-active separator exhibits outstanding cycle stability and rate capability. The present study contributes a novel strategy for the developments of functional separators to improve the electrochemical properties of LIBs.
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