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Stable Li storage in micron-sized SiO_(x) particles with rigid-flexible coating

Journal of Energy Chemistry 2022年第1期31卷 309-314,I0009页

作者： 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 SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China College of Materials Science and Engineering State Key Laboratory of Biopolysaccharide Fiber Forming and Eco-TextileQingdao UniversityQingdao 266071ShandongChina Beijing IAmetal New Energy Technology Co. LtdBeijing 100190China Dongguan TAFEL New Energy Technology Co. LtdDonggiian 523000.GuangdongChina

Micrometre-sized electrode materials have distinct advantages for battery applications in terms of energy density,processability,safety and *** the silicon monoxide anode that undergoes electrochemical 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 *** this work,we proposed to stabilize the electrochemistry *** of the micron-SiO_(x) anode by forming a rigid-flexible bi-layer coati ng on the particle *** coati ng consists of pyrolysis carbon as the inner layer and polydopamine as the outer *** the inner layer guarantees high structural rigidity at particle surface and provides efficient pathway for electron conduction,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 interface on the SiO_(x) particles.A composite an ode prepared by mixing the coated micron-SiOx with graphite delivered improved Li storage performance,and promised a high-capacity,long-life LiFePO_(4)/SiO_(x)-graphite pouch *** strategy provides a general and feasible solution for building high-energy rechargeable batteries from micrometre-sized electrode materials with significant volume variation.

关键词： Lithium-ion batteries Anodes Micron-SiOx rigid and flexible coating

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