果胶粘结剂在锂硫电池中的应用研究

徐翰涛; 邹振宇; 唐犇; 陈周; 张焕瑞; 陈锦春; 崔光磊

doi:10.11777/j.issn1000-3304.2020.20157

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果胶粘结剂在锂硫电池中的应用研究

研究论文 | 更新时间：2021-01-26

- 果胶粘结剂在锂硫电池中的应用研究
  增强出版
- The Study on the Application of Pectin Binder in Lithium-Sulfur Batteries
- 高分子学报 2021年52卷第2期页码：166-175
- 作者机构：
  
  1.烟台大学化学化工学院　烟台 264005
  2.中国科学院青岛生物能源与过程研究所　青岛 266101
- 作者简介：
  
  E-mail: zhanghr@qibebt.ac.cn Huan-rui Zhang, E-mail: zhanghr@qibebt.ac.cn
  E-mail: jinchuncchen@163.com Chen Jin-chun, E-mail: jinchuncchen@163.com
  E-mail: cuigl@qibebt.ac.cn Guang-lei Cui, E-mail: cuigl@qibebt.ac.cn
- 基金信息：
  
  中国科学院先导性科技专项(项目号 XDA22010600)和国家自然科学基金(基金号 51803230)资助项目()
- DOI：10.11777/j.issn1000-3304.2020.20157
  中图分类号：
- 纸质出版日期：2021-2-3，
  
  网络出版日期：2020-9-11，
  
  收稿日期：2020-6-18，
  
  修回日期：2020-7-16，
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徐翰涛, 邹振宇, 唐犇, 陈周, 张焕瑞, 陈锦春, 崔光磊. 果胶粘结剂在锂硫电池中的应用研究[J]. 高分子学报, 2021,52(2):166-175.

Han-tao Xu, Zhen-yu Zou, Ben Tang, Zhou Chen, Huan-rui Zhang, Jin-chun Chen, Guang-lei Cui. The Study on the Application of Pectin Binder in Lithium-Sulfur Batteries[J]. Acta Polymerica Sinica, 2021,52(2):166-175.
徐翰涛, 邹振宇, 唐犇, 陈周, 张焕瑞, 陈锦春, 崔光磊. 果胶粘结剂在锂硫电池中的应用研究[J]. 高分子学报, 2021,52(2):166-175. DOI： 10.11777/j.issn1000-3304.2020.20157.

Han-tao Xu, Zhen-yu Zou, Ben Tang, Zhou Chen, Huan-rui Zhang, Jin-chun Chen, Guang-lei Cui. The Study on the Application of Pectin Binder in Lithium-Sulfur Batteries[J]. Acta Polymerica Sinica, 2021,52(2):166-175. DOI： 10.11777/j.issn1000-3304.2020.20157.

摘要

锂硫电池由于其超高理论能量密度(2567 Wh·kg

−1

)，较低的成本，以及环境友好性，被视为下一代储能设备的有力竞争者之一. 鉴于粘结剂在稳定硫正极结构和抑制多硫化物穿梭方面可发挥重要作用，发展高性能硫正极粘结剂是改善锂硫电池性能的有效途径之一. 本文研究了以果胶作为锂硫电池正极粘结剂的可行性. 研究表明，采用果胶作为粘结剂的锂硫电池在电化学循环测试中首次放电比容量可达1210.6 mAh·g

−1

，并且在200次循环后仍有837.4 mAh·g

−1

的放电比容量，明显优于羧甲基纤维素钠-丁苯橡胶复合粘结剂的电池性能. 经研究证实果胶粘结剂性能优良的原因在于其可以有效确保多壁碳纳米管/硫复合正极的结构稳定性并抑制多硫化物的穿梭.

Abstract

Lithium-sulfur batteries (LSBs) are regarded as one of the ideal candidates of next-generation energy storage devices due to their high theoretical energy density (2567 Wh·kg

−1

)

low cost and environmental friendliness. However

there are still some obstacles towards the mass production of LSBs. For example

the cathode active material exhibits large volume change during the charge-discharge process

and low electronic conductivity

and the LSBs usually suffer from severe polysulfide shuttle effect

which result in the fast capacity fade. To alleviate these issues

the development of advanced binders for sulfur cathodes should be an effective solution since polymer binder plays an important role in stabilizing the structure of the sulfur cathode and suppressing polysulfide shuttle. Here we first present pectin as the binder for sulfur cathodes in LSBs. As a result

the as-prepared LSBs with pectin binder deliver a high initial discharge capacity of 1210.6 mAh·g

−1

as well as a discharge capacity of 837.4 mAh·g

−1

after 200 cycles

which is far better than the carboxymethyl cellulose-styrene butadiene rubber (CMC-SBR) counterpart. Cyclic voltammetry and electrochemical impedance characterization confirmed that the LSB using pectin binder exhibits better kinetic characteristics than CMC-SBR binder. It is evidenced by the polysulfide adsorption test and UV-Vis characterization that one mechanism behind such enhanced performance of pectin binder is that pectin binder can effectively suppress polysulfide shuttle. Furthermore

the scanning electron microscope and energy despersive spectroscopy mapping imaging demonstrate that pectin binder has the ability of ensuring the structural stability of MWCNT/S composite cathodes. This study shows that pectin is a high-performance sulfur cathode binder with widely potential applications.

关键词

锂硫电池粘结剂果胶羧甲基纤维素钠-丁苯橡胶

Keywords

Lithium-sulfur batteryBinderPectinCarboxymethyl cellulose-styrene butadiene rubber (CMC-SBR)

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