具有类混凝土结构的SiO_(x)-C锂离子电池复合材料的制备  

Preparation of SiO_(x)‑C composite materials with a reinforced concrete‑like structure for lithium‑ion batteries

作　　者：马晋杨 徐亚男 张羽 杜红宾[1] MA Jin‑Yang;XU Ya‑Nan;ZHANG Yu;DU Hong‑Bin(State Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京大学化学化工学院配位化学国家重点实验室,南京210093

出　　处：《无机化学学报》2023年第9期1766-1774,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21471075);中央高校基本科研业务费(No.020514380293)资助。

摘　　要：采用一种简单的方法制备具有类钢筋混凝土结构的Si-O-C负极材料,其中碳纳米管(carbon nanotubes,CNTs)如同钢筋一般嵌入材料中以提供应力支撑,硅原子被原子级分散的碳和氧原子均匀包裹,最后通过化学气相沉积镀上最外层的碳层,进一步抑制材料的体积变化。基于此独特的结构设计制备的CNTs/SiO_(x)-C/C负极表现出优异的电化学性能,其在0.5 A·g^(-1)的电流密度下循环970圈后容量保留率为80%。This work reports a simple method to prepare a Si‑O‑C anode material with a reinforced concrete‑like structure,in which carbon nanotubes(CNTs)were embedded and acted like steel bars to provide stress support,and the silicon atoms were wrapped with atomically dispersed carbon and oxygen concrete matrix.An outermost carbon layer was plated via chemical vapor deposition to further inhibit the volume change of the material.Thanks to the unique structural design,the prepared CNTs/SiO_(x)‑C/C anode showed excellent electrochemical performance with a high‑capacity retention rate of 80%after 970 cycles at 0.5 A·g^(-1).

关 键 词：SiO_(x) 碳纳米管 碳层包覆 负极 锂离子电池 

分 类 号：TB33[一般工业技术—材料科学与工程]