To improve the stability of Si-based anodes for lithium batteries, carbon-coated Si composite materials have been developed. Efficient and low-cost thermal treatment is introduced to prepare new anode materials. In this study, we employ lignocellulose or lignin as carbon precursor for preparing a carbon-coated Si particles hybrid to overcome the poor cycling stability and enhance the intrinsic electrical conductivity. Initially, a carbon precursor, lignin or lignocellulose was mixed with Si powders and graphite via ultra-sonication. Amorphous carbon-coated Si powders, which were from the silicon powder wastes of Si ingot slicing for solar cell, has been prepared by pyrolysis at 1000 <sup>o</sup>C for various time in argon atmosphere. This structure effectively suppresses the volume changes of silicon particles during lithiation and delithiation, and improves the electrical conductivity of negative electrode, leading to a stable cyclibility. It has been found experimentally that the negative electrodes of Si composites exhibit outstanding electrochemical performance of charging-discharging cycling and its capacity is over 1500 mAh/g.

Lignocellulose and lignin pyrolysis and preparation for carbon-coated silicon composites as negative electrodes of lithium batteries

254th National Meeting (2017)

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