Enhanced Ion Conductivity in Conducting Polymer Binder for High‐Performance Silicon Anodes in Advanced Lithium‐Ion Batteries |
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| Authors: | Wenwu Zeng Lei Wang Xiang Peng Tiefeng Liu Youyu Jiang Fei Qin Lin Hu Paul K Chu Kaifu Huo Yinhua Zhou |
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| Institution: | 1. Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China;2. Department of Physics and Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China |
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| Abstract: | Polymer binders with high ion and electron conductivities are prepared by assembling ionic polymers (polyethylene oxide and polyethylenimine) onto the electrically conducting polymer poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) chains. Crosslinking, chemical reductions, and electrostatics increase the modulus of the binders and maintain the integrity of the anode. The polymer binder shows lithium‐ion diffusivity and electron conductivity that are 14 and 90 times higher than those of the widely used carboxymethyl cellulose (with acetylene black) binder, respectively. The silicon anode with the polymer binder has a high reversible capacity of over 2000 mA h g?1 after 500 cycles at a current density of 1.0 A g?1 and maintains a superior capacity of 1500 mA h g?1 at a high current density of 8.0 A g?1. |
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| Keywords: | conducting polymers ion conductivity large capacity lithium‐ion batteries Si anodes |
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