Li4Ti5O12作為混合電化學電容器負極材料的電化學性能

Li₄Ti₅O₁₂作為混合電化學電容器負極材料的電化學性能

摘要: 通過XRD,SEM,BET及電化學測試等手段研究了高溫固相合成條件對尖晶石Li₄Ti₅O₁₂粉體結構、形貌、孔徑分布的影響及其在Li₄Ti₅O₁₂/C混合電化學電容器中的電化學性能.研究表明采用800℃合成溫度,保溫2h的合成條件獲得的尖晶石Li₄Ti₅O₁₂中孔發達,電化學性能良好,其比表面積為4.4m²·g^-1.該樣品采用175mÅg^-1充放電時的比容量約為150mAh·g^-1,功率特性和循環性能良好.

Abstract: The effects of high temperature solid state synthesis condition on the structure, micro-morphology, pore diameter distribution and electrochemical properties of spinel Li₄Ti₅O_l2 for an Li₄Ti₅O₁₂/C hybrid electrochemical capacitor were investigated by XRD, SEM, BET and charge/discharge tests. The results show that the Li₄Ti₅O₁₂ sample obtained at 800℃ for 2 h has rich mesopores and exhibits better electrochemical properties. Its BET surface area reaches 4.4 m²·g^-1 the specific capacity reaches approximately 150 mAh·g^-1 when charged and discharged at 175 mÅg^-l and the power performance and cyclelife is superior.