[1]李娇娇,王风彦,马志鹏,等.超薄MoS2纳米片改性隔膜用于锂硫电池的研究[J].燕山大学学报,2019,43(6):518-524.[doi:10.3969/j.issn.1007-791X.2019.06.007]
 LI Jiaojiao,WANG Fengyan,MA Zhipeng,et al.Research on ultrathin MoS2 nanosheets modified separator for lithium-sulfur batteries[J].Journal of YanShan University,2019,43(6):518-524.[doi:10.3969/j.issn.1007-791X.2019.06.007]
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超薄MoS2纳米片改性隔膜用于锂硫电池的研究
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《燕山大学学报》[ISSN:1007-791X/CN:13-1219/N]

卷:
43
期数:
2019年第6期
页码:
518-524
栏目:
材料与化学工程
出版日期:
2019-11-30

文章信息/Info

Title:
Research on ultrathin MoS2 nanosheets modified separator for lithium-sulfur batteries
文章编号:
1007-791X(2019)06-0518-07
作者:
李娇娇12王风彦12马志鹏12*邵光杰123
1. 燕山大学 河北省应用化学重点实验室,河北 秦皇岛 066004;
2. 燕山大学 环境与化学工程学院,河北 秦皇岛 066004;
3. 燕山大学 亚稳材料制备技术与科学国家重点实验室,河北 秦皇岛 066004
Author(s):
LI Jiaojiao12WANG Fengyan12MA Zhipeng12SHAO Guangjie123
1. Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao,Hebei 066004,China;
2.School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;
3. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China
关键词:
锂硫电池隔膜改性超薄MoS2纳米片穿梭效应
Keywords:
lithium-sulfur batteryseparator modificationultrathin MoS2 nanosheetsshuttle effect
分类号:
TN9152
DOI:
10.3969/j.issn.1007-791X.2019.06.007
文献标志码:
A
摘要:
与锂离子电池相比,锂硫电池具有较高的理论能量密度。然而,硫具有较差的电子导电性,以及充放电过程中体积膨胀和放电产物多硫化锂的“穿梭效应”,这将导致实际应用中电池的循环寿命很差。在本文中,利用溶剂插层剥离法将MoS2体相材料剥离成超薄的纳米片。后续通过简单的真空抽滤法将高导电性的碳纳米管和超薄MoS2纳米片的乙醇分散液依次修饰在商用聚丙烯隔膜上。电化学测试结果表明,使用CNT+MoS2/PP隔膜的锂硫电池在1C下显示出了924.4 mAh/g的高容量,200次循环后保持573.7 mAh/g的高可逆容量,容量保持率为80.3%,每圈容量衰减率仅为0.098%,明显优于使用聚丙烯隔膜的电化学性能。这主要是由于超薄的MoS2纳米片能够有效地吸附长链多硫化物(Li2Sx,4≤x≤8),同时高导电性的碳纳米管能够高效地将其还原成Li2S2/Li2S,从而抑制了多硫化物的“穿梭效应”。
Abstract:
Lithium-sulfur batteries have higher theoretical energy densities than lithium-ion batteries. However, sulfur has poor electronic conductivity, as well as lager volume expansion during charge and discharge and "shuttle effect" of the discharge product lithium polysulfide, which results in miserable cycle performance of lithium-sulfur battery in practical applications. In this paper, the MoS2 bulk phase material was peeled off into ultrathin nanosheets by solvent intercalation stripping. Subsequently, the highly conductive carbon nanotubes and the ultrathin MoS2 nanosheet of ethanol dispersion were respectively modified on a commercial polypropylene separator by a simple vacuum filtration method. Electrochemical test results show that lithium-sulfur batteries with CNT+MoS2/PP separator display high capacity of 924.4 mAh/g at 1 C, excellent reversible capacity of 573.7 mAh/g and capacity retention rate of 80.3% after 200 cycles, and the capacity decay rate is only 0.098%,significantly better than that of lithium-sulfur battery with polypropylene separator. This can mainly be accounted for based on the fact the ultra-thin MoS2 nanosheets can effectively adsorb long-chain polysulfides (Li2Sx, 4≤x≤8), while the highly conductive carbon nanotubes can efficiently reduce them to Li2S2/Li2S, thus inhibiting the "shuttle effect" of the long-chain lithium polysulfide.

备注/Memo

备注/Memo:
收稿日期:2019-04-24        责任编辑:王建青
基金项目:国家自然科学基金资助项目(51674221, 51704261);河北省自然科学基金资助项目(B2018203330)
作者简介:李娇娇(1995-),女,河北邢台人,硕士研究生,主要研究方向为锂硫电池;*通信作者:马志鹏(1985-),男,内蒙古赤峰人,博士,副教授,主要研究方向为碱金属二次电池和超级电容器关键材料,Email:mazp@ysu.edu.cn
更新日期/Last Update: 2020-01-03