负热膨胀材料对微米硅负极的改性研究  

Study on the modification of micron silicon anode by negative thermal expansion material

作　　者：康海 张静静 王志华 刘宜霖 张汉平[1] Kang Hai;Zhang Jingjing;Wang Zhihua;Liu Yilin;Zhang Hanping(School of Petrochemical Engineering,Changzhou University,Changzhou 213164)

机构地区：[1]常州大学石油化工学院,常州213164

出　　处：《化工新型材料》2023年第4期299-302,306,共5页New Chemical Materials

基　　金：国家自然科学基金(51273027)。

摘　　要：通过溶胶-凝胶法和高温固相法,将负热膨胀材料ZrV_(2)O_(7)包覆在硅微粉表面。结果表明:负热膨胀材料ZrV_(2)O_(7)能有效地改善界面稳定性,提升循环性能。当与碳材料进一步结合,构建C-ZrV_(2)O_(7)复合包覆层时,发现负热膨胀材料和碳具有协同作用。C-ZrV_(2)O_(7)包覆层在循环过程中与硅结合得更紧密,从而有效地抑制了硅负极与电解液的反应。改性后的材料有更高的可逆比容量和循环稳定性,在0.1C的放电倍率下,循环120周后放电比容量仍能稳定在500mAh/g以上,接近于纳米硅材料,显示出一定的工业应用价值。The sol-gel method and the high-temperature solid phase reaction were used to coat negative thermal expansion(NTE)material ZrV_(2)O_(7) on the surface of silicon micropowder.The results showed that ZrV_(2)O_(7) could effectively improve the interface stability and enhance the cycle performance.When it was further combined with the carbon material to construct a C-ZrV_(2)O_(7) composite coating layer,the NTE material and the carbon had a synergistic effect.The C-ZrV_(2)O_(7) 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.

关 键 词：硅基负极材料 负热膨胀 包覆 锂离子电池 

分 类 号：TQ152[化学工程—电化学工业]