Coil-to-Stretch Transition of Binder Chains Enabled by“Nano-Combs”to Facilitate Highly Stable SiO_(x) Anode

查看全文 作　　者：Shida [1]Xue;Yanda [1]Fu;Zhibo [1]Song;Shiming [1]Chen;Yuchen [1]Ji;Yan [2]Zhao;Huizhi [2]Wang;Guoyu [1]Qian;Luyi [1]Yang;Feng [1]Pan

机构地区：[1]s.xue,y.fu,z.song,s.chen,y.ji,dr.7.qian,pro6.l.yang,pro6.6.pan school of advanced materials,peking university shenzhen graduate school,shenzhen 518055,china;[2]department of mechanical engineering,imperial college london,london sw72bx,uk

出　　处：《Energy & Environmental Materials》索引2022年第5卷第4期,共7页

基　　金：support from the National Key R&D Program of China(2016YFB0700600,2020YFB0704500);China Postdoctoral Science Foundation(2019M660317);Engineering and Physical Sciences Research Council,UK(EP/S000933/1);Shenzhen Science and Technology Program(Grant No.RCBS20200714114820077). 摘　　要：The commercialized binder carboxymethyl cellulose sodium(CMC-Na)is considered unsuitable for micro-sized SiO_(x) anode as it cannot endure the large volume change to retain the conductive network during repeated charge/discharge cycles.Herein,a small amount of silicon nanoparticles(SiNPs)is added during slurry preparation process as“nano-combs”to unfold the convoluted CMC-Na polymer chains so that they undergo a coilto-stretch transition by interaction between polar groups(e.g.,-OH,-COONa)of polymer and SiNPs’large surface.Through maximizing the utilization of binders,a uniform conductive network is constructed with increased interfacial contact with micro-sized SiO_(x).As a result,the SiO_(x) electrode with optimized(10 wt%)SiNPs addition shows significantly improved initial capacity and cycling performance.Through revisiting CMCNa,a currently deemed unqualified binder in SiO_(x) anode,this work gives a brand-new perspective on the failing mechanism of Si-based anode materials and an improving strategy for electrode preparation. 关键词：binding network CMC-Na lithium-ion batteries Si anode SiO_(x)anode

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Coil-to-Stretch Transition of Binder Chains Enabled by“Nano-Combs”to Facilitate Highly Stable SiO_(x) Anode

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