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纯纤维素纳米纤维分离器具有高离子导电性和循环稳定性,用于离子电池

Nan Wang¹, Wenyong Liu¹, Haiyang Liao²

¹Hunan Key Laboratory of Biomass Fiber Functional Materials, Hunan International Scientific and Technological Innovation Cooperation Base of Biomass Fiber Materials and Application, Hunan University of Technology, Zhuzhou 412007, China; National and Local Joint Engineering Research Center of Advanced Packaging Materials Research and Development Technology, Hunan Key Laboratory of Advanced Packaging Materials and Technology, College of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412007, China.

International journal of biological macromolecules

|August 2, 2023

概括

纯纤维素纳米纤维 (CNF) 分离器为高性能离子电池 (LIB) 提供了更好的电解质可湿性和热稳定性. 这些新型分离器表现出卓越的性能和循环稳定性,有望在电池技术方面取得进步.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
纳米技术纳米技术

背景情况:

离子电池 (LIB) 中常规的多聚烯分离器存在电解质湿透性差,热稳定性有限,离子导电性低等问题.
这些局限性阻碍了高性能LIBs的发展.

研究的目的:

开发用于LIBs的纯纤维素纳米纤维 (CNF) 分离器,使用简单的过方法.
为了研究干燥温度对隔离器性能的影响.
评估在LIB中的CNF分离器的表现.

主要方法:

使用纤维素纳米纤维作为基质和三乙醇 (TBA) 作为分散介质,通过过方法制备纯CNF分离器.
对孔隙结构,电解质可湿性,机械性质,热稳定性和离子导电性的全面分析.
使用准备好的分离器组装和测试LiFePO4/金属电池.

主要成果:

在-80°C的冷干燥分离器 (TBA-FD) 呈现出最佳性能,孔隙度为70.8%,电解质吸收率为296%,离子导电率为1.90mS/cm.
CNF分离器表现出优异的热稳定性,在160°C时没有明显的收缩.
使用TBA-HD和TBA-FD分离器的电池显示出卓越的循环稳定性 (分别保持97.5%和96.4%的容量) 和速率性能.

结论:

通过简单方法准备的纯CNF分离器比传统的多烯分离器提供了显著的改进.
开发的CNF分离器对高性能LIB应用具有有前途的性能.
优化的干燥条件,特别是冷干燥,提高了分离器的性能.

关键词:

纤维素纳米纤维是一种纤维素纳米纤维.离子电池是一种离子电池.分离器分离器分离器分离器

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