Micrometre-sized electrode materials have distinct advantages for battery applications in terms of energy density,processability,safety and cost.For the silicon monoxide anode that undergoes electro-chemical alloying reaction with Li,the Li (de)intercalation by micron-sized active particles usually accompanies with a large volume variation,which pulverizes the particle structure and leads to rapidly faded storage performance.In this work,we proposed to stabilize the electrochemistry vs.Li of the micron-SiOx anode by forming a rigid-flexible bi-layer coating on the particle surface.The coating con-sists of pyrolysis carbon as the inner layer and polydopamine as the outer layer.While the inner layer guarantees high structural rigidity at particle surface and provides efficient pathway for electron conduc-tion,the outer layer shows high flexibility for maintaining the integrity of micrometre-sized particles against drastic volume variation,and together they facilitate formation of stable solid electrolyte inter-face on the SiOx particles.A composite anode prepared by mixing the coated micron-SiOx with graphite delivered improved Li storage performance,and promised a high-capacity,long-life LiFePO4/SiOx-graphite pouch cell.Our strategy provides a general and feasible solution for building high-energy rechargeable batteries from micrometre-sized electrode materials with significant volume variation.

Ming-Yan Yan;Zhu Liu;Zhuo-Ya Lu;Lin-Bo Huang;Ke-Cheng Jiang;Hong-Liang Li;Sen Xin;Quan Xu;Yu-Guo Guo

CAS Key Laboratory of Molecular Nanostructure and Nanotechnology,CAS Research/Education Center for Excellence in Molecular Sciences,Beijing National Laboratory for Molecular Sciences (BNLMS),Institute of Chemistry,Chinese Academy of Sciences (CAS),Beijing 100190,China;College of Materials Science and Engineering,State Key Laboratory of Biopolysaccharide Fiber Forming and Eco-Textile,Qingdao University,Qingdao 266071,Shandong,China;Beijing IAmetal New Energy Technology Co.,Ltd,Beijing 100190,China;Dongguan TAFEL New Energy Technology Co.,Ltd.Dongguan 523000,Guangdong,China

能源化学

[1]Ming-Yan Yan;Zhu Liu;Zhuo-Ya Lu;Lin-Bo Huang;Ke-Cheng Jiang;Hong-Liang Li;Sen Xin;Quan Xu;Yu-Guo Guo-.Stable Li storage in micron-sized SiOx particles with rigid-flexible coating)[J].能源化学,2022(01):309-314

Micrometre,pulverizes

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