DataVXACS Applied Materials & InterfacesPaper
journal article·2019-12-26Open access

l-Cysteine-Modified Acacia Gum as a Multifunctional Binder for Lithium–Sulfur Batteries

Qi Qi, Yaqian Deng, Sichen Gu, Min Gao, Jun-ya Hasegawa, Guangmin Zhou, Xiaohui Lv, Wei Lv, Quan-Hong Yang

ACS Applied Materials & Interfaces· Volume 11· Issue 51
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Source abstract

Abstract

A binder plays an important role in stabilizing the electrode structure and improving the cyclic stability of batteries. However, the traditional binders are no longer satisfactory in lithium-sulfur (Li-S) batteries because of their failure in accommodating the large volume changes of sulfur and trapping soluble intermediate polysulfides, thus causing severe capacity decay. In this work, we prepared a multifunctional binder for Li-S batteries by merely modifying the acacia gum (AG), a low-cost biomass polymer, with l-cysteine under mild conditions. Owing to the introduced amino and carboxyl branches by the l-cysteine, the modified AG shows enhanced polysulfide trapping ability and can effectively restrain the shuttling of polysulfides. In addition, the introduction of branches can help form a cross-linked 3D network with better mechanical strength and flexibility for adhering sulfur and accommodating the volume changes of cathode materials. As a result, compared with the normally used polyvinylidene fluoride binder and the unmodified AG binder, the l-cysteine-modified AG binder effectively enhanced the rate capability and cycling stability of the Li-S batteries directly using sulfur as the cathode, showing a promising way to prompt the practical use of Li-S batteries.
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Research context

Energy storagePolymers

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shenzhen Geim Graphene Center, Engineering Laboratory for Functionalized Carbon Materials, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China

Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan

Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China

Nanoyang Group, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Funding

Ministry of Education, Culture, Sports, Science and Technology · National Natural Science Foundation of China · Photo-excitonix Project in Hokkaido University · Guangdong Special Support Program · Guangdong Natural Science Funds for Distinguished Young Scholars · Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program · Cooperative Research Program of Institute for Catalysis, Hokkaido University · Shenzhen graphene manufacturing innovation center · Shenzhen Basic Research Project

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