journal article·2020-06-17

Water-Based Dual-Cross-Linked Polymer Binders for High-Energy-Density Lithium–Sulfur Batteries

Huan Yi, Yu Yang, Tu Lan, Tian Zhang, Shuhuai Xiang, Tian Tang, Hongbo Zeng, Chaoyang Wang, Yuliang Cao, Yonghong Deng

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Abstract

High-mass-loading electrodes with long-term stability have long been a great challenge for lithium–sulfur batteries (LSBs), since the conventional binders are unable to cope with the shuttling of lithium polysulfides and the structural damage in an electrode. Here, a novel water-based polymer, polyphosphate acid cross-linked chitosan ethylamide carbamide (PACEC), is developed as a binder to construct high-energy-density sulfur cathode and flexible LSBs. With a dual-cross-linked network, the PACEC shows excellent affinity with lithium polysulfides to relieve the shuttle effect and robust mechanical properties to stabilize the electrode. The sulfur cathode based on PACEC demonstrates a high sulfur loading of 14.8 mg cm–2, the areal initial capacity of 17.5 mAh cm–2, and Coulombic efficiency of 99.3%, while the amount of electrolyte is strictly limited to 6 μL mg–1. More importantly, a robust pouch cell with an area of 6 cm2 and only 177% oversized lithium can successfully integrate the energy density of 6.5 mAh cm–2 with the cycling retention per cycle of 99.74% during 270 cycles and flexibility at a curvature of 3 mm. This study provides inspirations for the design of eco-friendly polymer binders and paving new ways for the development of LSBs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Thermal Expansion and Ionic Conductivity

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

Affiliations

Department of Materials Science & Engineering, Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China

Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China

College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan 430072, China

Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada

Funding

Guangzhou Science and Technology Program key projects · Shenzhen International Scientific and Technological Cooperation Grants · Guangdong Province · Shenzhen Municipality · Guangdong Basic and Applied Basic Research Foundation

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