The sol-gel method and the high-temperature solid phase reaction were used to coat negative thermal expansion (NTE) material ZrV2O7 on the surface of silicon micropowder.The results showed that ZrV2O7 could effectively improve the interface stability and enhance the cycle performance.When it was further combined with the carbon material to construct a C-ZrV2O7 composite coating layer,the NTE material and the carbon had a synergistic effect.The C-ZrV2O7 composite coating layer was more tightly combined with silicon during cycling,which effectively inhibited the reaction between the silicon negative electrode and the electrolyte.The modified material possessed higher reversible specific capacity and cycle stability.At a charge-discharge rate of 0.1C,the specific discharge capacity could still be stabilized over 500mAh/g after 120 cycles,which was close to nano-silicon materials,indicating a prospect for industrial application.
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基金资助
国家自然科学基金(51273027)
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