Studies on the Influence of Pyrene on the Low Temperature Performance of Polyaniline Containing Lithium-sulfur Battery

Yu-jie Yao; Qi Lu; Hong Gao; Xian-hong Wang; Fo-song Wang

doi:10.11777/j.issn1000-3304.2017.17096

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Studies on the Influence of Pyrene on the Low Temperature Performance of Polyaniline Containing Lithium-sulfur Battery

Research Article | 更新时间：2021-01-27

- Studies on the Influence of Pyrene on the Low Temperature Performance of Polyaniline Containing Lithium-sulfur Battery
- Acta Polymerica Sinica Issue 9, Pages: 1517-1523(2017)
- 作者机构：
  
  1.中国科学院长春应用化学研究所生态环境高分子材料重点实验室长春 130022
  2.中国科学技术大学合肥 230026
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17096
  CLC：
- Published：20 September 2017，
  
  Received：24 April 2017，
  
  Revised：25 May 2017，
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Yu-jie Yao, Qi Lu, Hong Gao, Xian-hong Wang, Fo-song Wang. Studies on the Influence of Pyrene on the Low Temperature Performance of Polyaniline Containing Lithium-sulfur Battery. [J]. Acta Polymerica Sinica (9):1517-1523(2017)
DOI：

Yu-jie Yao, Qi Lu, Hong Gao, Xian-hong Wang, Fo-song Wang. Studies on the Influence of Pyrene on the Low Temperature Performance of Polyaniline Containing Lithium-sulfur Battery. [J]. Acta Polymerica Sinica (9):1517-1523(2017) DOI： 10.11777/j.issn1000-3304.2017.17096.

摘要

提出在电解液中加入电荷转移中间体改善锂硫电池低温性能的思路，在电解液中添加芘作为电荷转移中间体，加速低温下聚苯胺锂硫电池电化学反应的平衡过程.循环伏安研究证明，芘在锂硫电池放电过程中的高压平台附近具有电化学活性，并通过X射线光电子能谱证实芘的引入能够使锂硫电池在低温下提高多硫化物平衡速率，延长第一平台，生成更多长链多硫化锂.对同样电极材料组成的聚苯胺/硫复合正极材料构成的锂硫电池，当在电解液中加入0.1 mol/L的芘时，相比于不含芘的锂硫电池，其第50次充放电循环下容量在0℃时能够提升22.8%，而在-15℃时能提升25.1%.

Abstract

Conductive polyaniline is an important material to improve the capacity and cycle stability of Lithium-sulfur battery

but lithium-sulfur cathode with conductive polyaniline still faces poor capacity retention and cycle stability at temperature below 0℃ due to slow equilibration of sulfur or polysulfides. A novel concept using redox mediator to accelerate electrochemical reaction at low temperature was proposed. By adding a redox mediator with its redox potential below S and between Li and S

the electrochemical reaction is accelerated and the low temperature performance of Li-S battery is therefore improved. More specifically

when pyrene is used as the redox mediar (RM)

it can be oxidized to RM

at the cathode surface by sulfur or polysulfides

then RM

attains electron from cell system regenerating RM. The mediator acts as an electron transfer agent permitting efficient reduction of sulfur or polysulfides. Pyrene is identified from cyclic voltammogram (CV) test as electrochemical active substance around the high-plateau in discharge process

which meets the requirement of redox mediator in Li-S battery at low temperature. When pyrene was dissolved in electrolyte

it may act as an effective electron transfer agent to increSase the electron transfer rate

permitting efficient reduction of sulfur to polysulfides Li

(4 ≤

≤ 8)

thereby accelerating the equilibration process

and finally enhanced the low temperature performance of Li-S battery. To analyze the influence of pyrene on the composition of reduction products of sulfur

ex situ

X-ray photoelectron spectroscopy (XPS) is used to test the cathode material after discharging to 2.2 V at the 10

cycle. XPS experiments confirm that the addition of pyrene may accelerate the polysulfides equilibration rate and prolong the first plateau. When ultrathin sulfur-wrapped PANI nanocomposite (S-PANI) is used as cathode material

taking the capacity of 25℃ as reference

the addition of 0.1 mol/L pyrene into electrolyte could raise the 50

capacity retention rate from 68.9% to 84.6% at 0℃

i.e

. by 22.8%. This capacity retention rate is increased by 25.2% from 56.0% to 70.1% at -15℃.

关键词

聚苯胺芘锂硫电池低温性能电荷转移中间体

Keywords

PolyanilinePyreneLithium-sulfur batteryLow temperature performanceRedox mediator

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Department of Polymer Science and Engineering, University of Science and Technology of China

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