Silicon is considered as the most promising anode material for lithium-ion batteries because of its super high theoretical capacity.However,lithium-ion batteries with silicon anodes cannot be applied in the commercial field because silicon undergoes drastic volume changes dramatically during the Li+ insertion/extraction process,which causes the electrodes to be pulverized.Binders with excellent performance will be able to limit the pulverization caused by the volume change of silicon anode.In this paper,a dextran-isocyanate-ureido pyrimidinone (DEX-Upy) polymer was synthesized,then physically mixed with polyacrylic acid (PAA) to prepare a network polymer based on crosslinked bond by hydrogen bonds,named PAA-DEX-Upy.The polymer binder restricted the pulverization of the micron-size silicon anode through the interaction of its network structure and polar groups with the silicon particles.Compared with DEX-Upy and PAA electrodes,PAA-DEX-Upy electrode showed a good cycle performance,and the micron-size silicon anode had a higher first-time coulombic efficiency.In this paper,the low-cost micron-size silicon was used as an active material,which was more conducive to commercial applications.
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基金资助
内蒙古自然科学基金面上项目(2018LH02011)
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