A new single micro-particle electrode(SMPE)fabrication technique the inlaid SMPE technique was introduced in this paper.The preparation procedure of an alloy SMPE was described in detail.Based on the SMPE technique,th...A new single micro-particle electrode(SMPE)fabrication technique the inlaid SMPE technique was introduced in this paper.The preparation procedure of an alloy SMPE was described in detail.Based on the SMPE technique,the electrochemical behavior of LaNi_ 4.7Al_ 0.3 spherical particles with two different radii was investigated.The results of CV study showed that more detailed electrochemical information of the alloy can be provided on the alloy SMPE as compared with that on the composite alloy electrode.The results of potential step study depict that H diffusion coefficient in LaNi_ 4.7Al_ 0.3 keeps almost constant when the size of the alloy particle changes,and the diffusion coefficient measured on the alloy SMPE[(2.5—2.6)×10-9 cm 2/s] is about one order larger than that detected on the composite alloy electrode.展开更多
通常需要将电活性材料与导电剂、粘接剂等辅助物质混合后,制成复合电极来评测材料的电化学性能,但辅助物质和复合电极结构可能影响评测结果的准确性.由于单颗粒微电极可选取单一颗粒进行测试,无需加入添加剂材料,因此,采用单颗粒微电极...通常需要将电活性材料与导电剂、粘接剂等辅助物质混合后,制成复合电极来评测材料的电化学性能,但辅助物质和复合电极结构可能影响评测结果的准确性.由于单颗粒微电极可选取单一颗粒进行测试,无需加入添加剂材料,因此,采用单颗粒微电极评测材料性能可以得到材料的本征性能.同时,单颗粒微电极还可以实现对材料的快速、精确评测.本文利用单颗粒微电极方法测试了球形LiFePO_4颗粒的循环伏安特性、循环稳定性和动力学性能.结果表明,单颗粒微电极可以20 m V·s^(-1)的速率快速扫描、精确测试,测得锂离子在该颗粒中的扩散系数约为2.4~3.2×10^(-11)cm^2·s^(-1),电化学反应的控制步骤为锂离子的固相扩散控制.另外,LiFePO_4颗粒在该单颗粒微电极构成的电池中表现出良好的循环稳定性.这些显示了单颗粒微电极在电极材料特性研究中的可行性.展开更多
文摘A new single micro-particle electrode(SMPE)fabrication technique the inlaid SMPE technique was introduced in this paper.The preparation procedure of an alloy SMPE was described in detail.Based on the SMPE technique,the electrochemical behavior of LaNi_ 4.7Al_ 0.3 spherical particles with two different radii was investigated.The results of CV study showed that more detailed electrochemical information of the alloy can be provided on the alloy SMPE as compared with that on the composite alloy electrode.The results of potential step study depict that H diffusion coefficient in LaNi_ 4.7Al_ 0.3 keeps almost constant when the size of the alloy particle changes,and the diffusion coefficient measured on the alloy SMPE[(2.5—2.6)×10-9 cm 2/s] is about one order larger than that detected on the composite alloy electrode.
文摘通常需要将电活性材料与导电剂、粘接剂等辅助物质混合后,制成复合电极来评测材料的电化学性能,但辅助物质和复合电极结构可能影响评测结果的准确性.由于单颗粒微电极可选取单一颗粒进行测试,无需加入添加剂材料,因此,采用单颗粒微电极评测材料性能可以得到材料的本征性能.同时,单颗粒微电极还可以实现对材料的快速、精确评测.本文利用单颗粒微电极方法测试了球形LiFePO_4颗粒的循环伏安特性、循环稳定性和动力学性能.结果表明,单颗粒微电极可以20 m V·s^(-1)的速率快速扫描、精确测试,测得锂离子在该颗粒中的扩散系数约为2.4~3.2×10^(-11)cm^2·s^(-1),电化学反应的控制步骤为锂离子的固相扩散控制.另外,LiFePO_4颗粒在该单颗粒微电极构成的电池中表现出良好的循环稳定性.这些显示了单颗粒微电极在电极材料特性研究中的可行性.
