磷酸铁锂/炭黑/碳纳米纤维柔性正极的制备及其性能

doi:10.13475/j.fzxb.20210807406

纺织学报 ›› 2022, Vol. 43 ›› Issue (11): 16-21.doi: 10.13475/j.fzxb.20210807406

磷酸铁锂/炭黑/碳纳米纤维柔性正极的制备及其性能

张长欢¹, 李纤纤¹, 张力冉¹, 李德阳¹, 李念武², 吴红艳¹()

1.北京服装学院材料设计与工程学院, 北京 100029
2.北京化工大学化学工程学院, 北京 100029

收稿日期:2021-08-19 修回日期:2022-06-22 出版日期:2022-11-15 发布日期:2022-12-26
通讯作者: 吴红艳
作者简介:张长欢(1981—),女,讲师,博士。主要研究方向为柔性储能材料及功能纤维材料。
基金资助:
国家自然科学基金项目(21703010);北京市教育委员会科技计划一般项目(KM202210012009);北京高校大学生创新创业训练校际合作计划项目(202298044);北京服装学院“实培计划”项目(NHFZ20210022/017);北京服装学院科学研究项目(2020A-04)

Preparation and performance of lithium iron phosphate/carbon black/carbon nanofibers flexible cathode

ZHANG Changhuan¹, LI Xianxian¹, ZHANG Liran¹, LI Deyang¹, LI Nianwu², WU Hongyan¹()

1. School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2021-08-19 Revised:2022-06-22 Published:2022-11-15 Online:2022-12-26
Contact: WU Hongyan

摘要/Abstract

摘要：

为更好满足柔性锂离子电池对电极材料柔性化的需求,通过静电纺丝以及热处理的方法制备了兼具柔韧性和自支撑性能的磷酸铁锂/炭黑/碳纳米纤维(LiFePO₄/CB/CNFs)柔性正极材料,并对其结构和性能进行表征与分析。结果表明:合成的LiFePO₄活性物质为橄榄石结构,自支撑LiFePO₄/CB/CNFs柔性正极为具有较高孔隙的三维网络结构,CB和LiFePO₄活性物质均可较均匀地嵌在CNFs基体中,CB在LiFePO₄活性物质生成过程中对其纯度和晶体结构的形成未产生影响;当CB质量分数为0.10%和0.15%时,柔性正极均具有较好的电化学可逆性,首圈放电比容量分别为141.1和139.1 mA·h/g,首圈库伦效率分别为87.3%和87.6%,且循环100圈后仍保持性能稳定,第2圈后的库伦效率维持在99%左右。

关键词: 静电纺丝, 柔性正极, 磷酸铁锂, 炭黑, 碳纳米纤维

Abstract:

In order to achieve flexibility of the electrode material for flexible lithium-ion batteries, a self-supporting lithium iron phosphate/carbon black/carbon nanofibers (LiFePO₄/CB/CNFs) flexible cathode was developed by a combination of electrospinning and heat treatment. The results show that the olivine structure LiFePO₄ is formed after heat treatment. The prepared flexible LiFePO₄/CB/CNFs cathode is a three-dimensional network structure nanomaterial with a high porosity. The CB and active material LiFePO₄ are uniformly embedded in the CNF matrix. The CB did not affect the LiFePO₄ crystal structure during the formation of the active material. When the CB mass ratios are set to 0.10% and 0.15%, flexible composite cathode demonstrates good electrochemical reversibility, the first discharge specific capacity is 141.1 and 139.1 mA·h/g, respectively, and the coulombic efficiency is 87.3% and 87.6% for first cycle, respectively. The discharge specific capacity performance is relatively stable during 100 cycles, and the coulombic efficiency is maintained at about 99% from 2 to 100 cycle.

Key words: electrospinning, flexible cathode, lithium iron phosphate, carbon black, carbon nanofiber

中图分类号:

TM910

张长欢, 李纤纤, 张力冉, 李德阳, 李念武, 吴红艳. 磷酸铁锂/炭黑/碳纳米纤维柔性正极的制备及其性能[J]. 纺织学报, 2022, 43(11): 16-21.

ZHANG Changhuan, LI Xianxian, ZHANG Liran, LI Deyang, LI Nianwu, WU Hongyan. Preparation and performance of lithium iron phosphate/carbon black/carbon nanofibers flexible cathode[J]. Journal of Textile Research, 2022, 43(11): 16-21.

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磷酸铁锂/炭黑/碳纳米纤维柔性正极的制备及其性能

Preparation and performance of lithium iron phosphate/carbon black/carbon nanofibers flexible cathode

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