Si/TiO2复合碳纳米纤维的制备及其性能

doi:10.13475/j.fzxb.20200501508

纺织学报 ›› 2021, Vol. 42 ›› Issue (03): 36-43.doi: 10.13475/j.fzxb.20200501508

所属专题：纳米纤维制备及应用

Si/TiO₂复合碳纳米纤维的制备及其性能

邢宇声¹^,², 胡毅¹^,²(), 程钟灵¹^,²

1.浙江理工大学先进纺织材料与制备技术教育部重点实验室, 浙江杭州 310018
2.浙江理工大学生态染整技术教育部工程研究中心, 浙江杭州 310018

收稿日期:2020-05-08 修回日期:2020-12-15 出版日期:2021-03-15 发布日期:2021-03-17
通讯作者: 胡毅
作者简介:邢宇声(1997—),男,硕士生。主要研究方向为碳纳米纤维的储能研究。
基金资助:
浙江省自然科学基金项目(LY21E030023);浙江理工大学科研发展专项(2020Y001)

Preparation and properties of Si/TiO₂ composite carbon nanofibers

XING Yusheng¹^,², HU Yi¹^,²(), CHENG Zhongling¹^,²

1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2. Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China

Received:2020-05-08 Revised:2020-12-15 Online:2021-03-15 Published:2021-03-17
Contact: HU Yi

摘要/Abstract

摘要：

为改善硅/碳纳米纤维的形貌结构并提升其储能性能,将球磨均匀的Si/TiO₂粉末和聚丙烯腈(PAN)通过静电纺丝制得Si/TiO₂/PAN纳米纤维膜,然后分别在氩气和氢气氛围中炭化得到Si/TiO₂复合碳纳米纤维;优化了Si与TiO₂的最佳配比与最适炭化温度,分析了纤维形貌、分子结构、元素分布对复合碳纳米纤维储能性能的影响。结果表明:在Si和TiO₂质量比为1∶2以及900 ℃炭化条件下,Si/TiO₂复合碳纳米纤维具有良好的导电性,其纤维结构与形成的TiO₂无序框架可有效缓解Si的体积膨胀和团聚,并显著提高锂离子电池的容量与循环稳定性;在0.2 mA/g电流密度下进行120次循环后,在氩气和氢气条件下炭化制备的复合碳纳米纤维的放电比容量分别为942和1 212 mA·h/g,在氢气条件下炭化制备的复合碳纳米纤维拥有更加优异的倍率性能。

关键词: 复合碳纳米纤维, 功能纤维, 储能纤维, 静电纺丝, 炭化处理, 球磨混合, 电化学性能

Abstract:

In order to improve the morphology and structure of silicon/carbon nanofibers and enhance their energy storage performance, Si/TiO₂/PAN nanofiber membranes was prepared though electrospinning of the ball milling Si/TiO₂ powder and polyacrylonitrile(PAN), and then in an argon or hydrogen atmosphere carbonization treatment was carried out to obtain Si/TiO₂composite carbon nanofibers. The most suitable ratio of Si to TiO₂ and carbonization temperature were optimized, the influence of fiber morphology, molecular structure, and element distribution on energy storage performance were analyzed. As a result, Si/TiO₂ composite carbon nanofibers with good conductivity were prepared under the conditions of 1∶2 mass ratio between Si and TiO₂ and 900 ℃ carbonization temperature. The fiber structure and the formed TiO₂ disordered framework were able to ease effectively the volume expansion and agglomeration of silicon, significantly improving the capacity and cycle stability of lithium-ion batteries. At 0.2 mA/g current density and after 120 cycles, the discharge specific capacities of the composite carbon nanofibers prepared by argon and hydrogen carbonization were 942 and 1 212 mA·h/g, respectively. The work showed that the composite carbon nanofibers prepared through hydrogen carbonization have better rate performance.

Key words: composite carbon nanofibers, functional fiber, energy storage fiber, electrospinning, carbonization, ball milling mixing, electrochemical performance

中图分类号:

TS195

邢宇声, 胡毅, 程钟灵. Si/TiO₂复合碳纳米纤维的制备及其性能[J]. 纺织学报, 2021, 42(03): 36-43.

XING Yusheng, HU Yi, CHENG Zhongling. Preparation and properties of Si/TiO₂ composite carbon nanofibers[J]. Journal of Textile Research, 2021, 42(03): 36-43.

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Si/TiO₂复合碳纳米纤维的制备及其性能

Preparation and properties of Si/TiO₂ composite carbon nanofibers

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