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Surface-modified composite separator for lithium-ion battery with enhanced durability and security

Progress in Natural Science:Materials International 2023年第6期33卷 804-811页

作者： Wangbing Yao Xiaodong He Zhuoyuan Zheng Dongming Liu Jinbao Song Yusong Zhu School of Materials Science and Engineering Anhui University of Technology Nanjing Gotion Battery Co.LTD School of Energy Science and Engineering Nanjing Tech University

In the long-term repeated cycling process of lithium-ion batteries(LIBs), the seamless transmission of lithium ions through the separator is crucial for the normal operation of the batteries. However, the irregular porous structure of the commonly used polyethylene(PE) separator leads to the accumulation of chaotic lithium ions and the formation of lithium dendrites, which pose serious safety risks. To enhance the safety performance of LIBs, we propose a novel composite separator design that incorporates ultrafine Al2O3particles and a multifunctional gel polymer binder, which are mixed and coated onto PE membranes. This composite separator improves the wettability and lithium-ion transference number, resulting in impressive cycling lifespan and high average Coulombic efficiencies for large-scale prismatic LiFePO4//graphite batteries. These batteries exhibit approximately 80 % capacity retention over 1900 cycles with average Coulombic efficiencies of 99.95 %. Furthermore,even after 1000 cycles, LIBs fabricated with the composite separator pass the rigorous nail penetration test. These enhancements in safety performance offer promising prospects for achieving dendrite-free LIBs during long-term cycling processes.

关键词： multifunctional binder Dendrite-free Long cycling lifespan Nail penetration examination

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Advances of polymer binders for silicon-based anodes in high energy density lithium-ion batteries

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InfoMat 2021年第5期3卷 460-501页

作者： Yu-Ming Zhao Feng-Shu Yue Shi-Cheng Li Yu Zhang Zhong-Rong Tian Quan Xu Sen Xin Yu-Guo Guo CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)BeijingChina Shenzhen EUBO New Material Technology Co. LtdShenzhenChina University of Chinese Academy of Sciences BeijingChina

Conventional lithium-ion batteries(LIBs)with graphite anodes are approaching their theoretical limitations in energy *** the conventional graphite anodes with high-capacity Si-based anodes represents one of the most promising strategies to greatly boost the energy density of ***,the inherent huge volume expansion of Si-based materials after lithiation and the resulting series of intractable problems,such as unstable solid electrolyte interphase layer,cracking of electrode,and especially the rapid capacity degradation of cells,severely restrict the practical application of Sibased *** the past decade,numerous reports have demonstrated that polymer binders play a critical role in alleviating the volume expansion and maintaining the integrity and stable cycling of Si-based *** this review,the state-of-the-art designing of polymer binders for Si-based anodes have been systematically summarized based on their structures,including the linear,branched,crosslinked,and conjugated conductive polymer ***,the comprehensive designing of multifunctional polymer binders,by a combination of multiple structures,interactions,crosslinking chemistries,ionic or electronic conductivities,soft and hard segments,and so forth,would be promising to promote the practical application of Si-based ***,a perspective on the rational design of practical polymer binders for the large-scale application of Si-based anodes is presented.

关键词： high energy density lithium-ion battery multifunctional binder polymer binder silicon anode

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