硅酸盐学报2017，Vol.45Issue(6)：756-764,9.DOI:10.14062/j.issn.0454-5648.2017.06.02
离子掺杂对Nasicon型化合物电化学性能的影响
Effect of Ion Substitution on Electrochemical Properties of Nasicon Compounds
摘要
Abstract
The crystal structure does not change by substituting one of the transition metal elements, which is the one primary advantage of Nasicon compound. The corresponding derivatives can be used as electrodes for lithium ion battery, and the solid state electrolyte as well. In this study, the effect of cation and anion doping on the electrochemical performance of materials was summarized. It was noted that the cation doping can improve the ionic conductivity of Nasicon solid state electrolyte efficiently. Specifically, LiGe2(PO4)3 based compound exhibits the highest ionic conductivity. The derived compound exhibits the?298 of 5.1×10-3S/cm with the electrochemical potential window up to 6V when the doping concentration of Al3+ is 0.5. By contrast, the anion doping can also tailor its ionic conductivity, however, the absolute value is about 10-4S/cm, which is lower than that of cation doping. With respect to electrochemical performance of electrode for battery, the properties of Li3V2(PO4)3 cathode can be improved significantly by cation doping. For instance, it can deliver a high discharge capacity of 162.4 mA·h/g at the rate of 0.5 C with Nb3+ doping. While the performance of Li3Fe2(PO4)3 can be mended by anion doping. The discharge capacity reaches up to 96.6mA·h/g with a capacity retention of 96% after 60 cycles at the rate of 2 C when the doping concentration of VO43- is 0.45.关键词
固体电解质/电极材料/离子掺杂/电化学性能Key words
Solid electrolyte/electrode/ion doping/electrochemical properties分类
化学化工引用本文复制引用
华正伸,冯晓晶,王晓然,彭会芬..离子掺杂对Nasicon型化合物电化学性能的影响[J].硅酸盐学报,2017,45(6):756-764,9.基金项目
河北省自然科学基金(No.E2016202358)资助项目. （No.E2016202358）
