Affiliation:
1. College of Chemistry Xiangtan University Xiangtan Hunan 411105 P. R. China
2. Hunan Institute of Advanced Sensing and Information Technology Xiangtan University Hunan 411105 P. R. China
3. Key Laboratory of Polymeric Materials & Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province Key Lab of Environment‐Friendly Chemistry and Application in Ministry of Education Xiangtan University Xiangtan Hunan 411105 P. R. China
4. Department of Materials Science and Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China
Abstract
AbstractBinders play an essential role in maintaining the mechanical integrity and stability of electrodes. Herein, a novel aqueous and conductive binder (OXP/CNT‐1.5) consisting of carbon nanotubes (CNTs) interwoven with a flexible nano‐film of oxidized pullulan (OXP) is designed. The rotatable methylene ether bridge units within OXP chain endow the binder with high chain flexibility, facilitate rapid ion transport, and buffer severe volumetric expansion during charge‐discharge cycling. Furthermore, its tight intertwining with CNTs forms continuously conductive and flexible skeletons, which can firmly grasp active nanoparticles through a “face‐to‐point” bonding type, guaranteeing the electrodes high conductivity and outstanding mechanical integrity. More importantly, these conductive binders are applicable to the Si/C anode as well as the LiFePO4 cathode. The as‐fabricated Si/C anode delivers a 88.2% capacity retention after 100 cycles and 80.2% capacity retention at 0.5 A g−1 (vs 0.05 A g−1), far surpassing the electrode fabricated by conventional polyvinylidene fluoride binder and carbon black mixtures. The LiFePO4/Si/C full cells based on OXP/CNT‐1.5 demonstrate excellent electrochemical behavior and stability (97.4% capacity retention after 100 cycles). This work highlights the key role of rotatable methylene ether bridge units to enhance the flexibility, ion conductivity, and stability, which is inspiring in the context of designing novel binders for high‐performance batteries.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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