碳改性TiNb_2O_7及其对嵌脱锂性能的影响  

Carbon-modified TiNb_2O_7 and Its Effect on Lithiation and Delithiation Performance

作　　者：娄帅锋 尹鸽平[1] 程新群[1] 高金龙[1] 马玉林[1] 左朋建[1] 高云智[1] 杜春雨[1] 

机构地区：[1]哈尔滨工业大学化工学院特种化学电源研究所,哈尔滨150001

出　　处：《表面技术》2015年第1期41-46,共6页Surface Technology

基　　金：国家自然科学基金资助(51472065)~~

摘　　要：目的研究界面导电性对材料电化学性能的影响,提升Ti Nb2O7的循环稳定性。方法研究纯相Ti Nb2O7材料的电化学特性,对比不同荷电态(SOC)的极片,研究材料导电性对电化学性能的影响机制。在材料的制备过程中加入不同的碳源构建导电网络,提升其导电性。结果得到了导电性对材料的影响机理,加入不同碳源显著提升了材料的循环稳定性。结论 LixTi Nb2O7的导电性随嵌锂深度的增加而增大,导致材料的脱锂行为不能彻底进行。通过加入碳纳米管或者蔗糖热解碳,可以有效提升材料的循环性能。Objective To investigate the effect of interfacial conductivity on the electrochemical performance and elevate the cy-cling stability of TiNb2 O7 . Methods The electrochemical characteristics of pure TiNb2 O7 anode materials were studied, and the in-fluencing mechanism of interfacial conductivity on the electrochemical performance was analyzed by comparing the electrodes with different state of charge （ SOC ） . The conductive network was constructed by adding different carbon sources in the preparation process of the material, to elevate its conductivity. Results The influencing mechanism of the conductivity on the material was ob-tained. Addition of different carbon sources significantly elevated the cycling stability of the material. Conclusion The conductivity of LixTiNb2 O7 increased with the increasing depth of lithiation, which resulted in the incomplete delithiation of the material. The cycling performance was markedly elevated after the addition of carbon nanotube or sucrose pyrolytic carbon.

关 键 词：锂离子电池 TiNb2O7负极材料 导电性 电化学性能 

分 类 号：TQ131.1[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]