A novel high-performance cylindrical hybrid supercapacitor with Li4-xNaxTi5O12/activated carbon electrodes

作者：Lee Seung Hwan; Kim Hong Ki; Yun Ye Sol; Yoon Jung Rag; Lee Sung Gap; Lee Young Hie^*

来源：International Journal of Hydrogen Energy, 2014, 39(29): 16569-16575.

DOI：10.1016/j.ijhydene.2014.05.072

• Hybrid supercapacitor
• Li4Ti5O12
• Na doping
• Cylindrical supercapacitor
• Cycling behavior

A cylindrical hybrid supercapacitor was fabricated using Li4-xNaxTi5O12 as an anode and activated carbon as a cathode. Li4-xNaxTi5O12 (0 %26lt;= x %26lt;= 0.6) powder was successfully crystallized, and the grain size of Li4-xNaxTi5O12 decreased with increasing Na content. This indicated that Na can enhance the electrochemical performance due to smaller grain size and ionic conductivity. However, excessive Na content causes a distortion of the original Li4Ti5O12 structure during cycling. The hybrid supercapacitor with the Li3.7Na0.3Ti5O12 anode shows similar electrochemical performance to Li3.4Na0.6Ti5O12, and approximately 92% of the maximum cycle performance is retained, even after 5000 cycles at 2.5 Ag-1.

• 出版日期2014-10-2