Preparation of POSS-based Porous Anode Material and its Performance Research
Two types of incompletely condensed lithium sesquisiloxane silanols with phenyl or vinyl group were composited with polyacrylonitrile(PAN),and then the porous structure was prepared by the Friedel-Crafts reaction.After high-temperature carbonization process,the porous silicon-based anode materials were finally prepared.The porous structure of the material was characterized by scanning electron microscopy(SEM)and N2 adsorption and desorption tests,and the sample anode was subjected to continuous charging and discharging tests on a LAND battery test system.The results show that the porous silicon-based composites prepared in this paper possess a good porous structure with a pore size of 4 nm.After being applied to the anode of lithium-ion batteries,their first-cycle coulombic efficiency is as high as 78.5%,and they are able to maintain a specific capacity of 665.2 mAh/g after 200 cycles,with a capacity retention rate of 87.9%.Reversible specific capacity of 318.3 mAh/g is maintained even at a high current density of 2 A/g.
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