阳极
材料科学
石墨烯
钛酸锂
电化学
钛酸酯
化学工程
锂离子电池
电极
锂(药物)
电解质
无机化学
电池(电)
纳米技术
化学
复合材料
陶瓷
物理化学
功率(物理)
量子力学
内分泌学
工程类
物理
医学
作者
Ruiyi Li,Jiang Yuanyuan,Xiaoyan Zhou,Zaijun Li,Zhi‐Guo Gu,Guangli Wang,Liu Junkang
标识
DOI:10.1016/j.electacta.2015.08.018
摘要
The paper reported a facile synthesis of lithium titanate/nitrogen and sulfur co-doped graphene quantum dots(LTO/N,S-GQDs). Tetrabutyl titanate was dissolved in tertbutanol and heated to refluxing state by microwave irradiation. Then, lithium acetate was added into the mixed solution to produce LTO precursor. The precursor was hybridized with N,S-GQDs in ethanol. Followed by drying and thermal annealing at 500 °C in Ar/H2 to obtain LTO/N,S-GQDs. The synthesis creates fully crystalline interconnected porous framework composed of nanoscale LTO crystals. The unique architecture achieves to maximize the high-rate performance and enhance the power density. More importantly, the introduction of N,S-GQDs don't almost influence on the electrolyte transport, but greatly improve the electron transfer and the storage lithium capacity. The LTO/N,S-GQDs anode exhibits remarkably enhanced electrochemical performance for lithium ion battery. The specific discharge capacity is 254.2 mAh g−1 at 0.1C and 126.5 mAh g−1 at 10C. The capacity remains 96.9% at least after 2000 cycles at 2C. The battery performance is significantly better than that of pure LTO electrode and LTO/graphene electrode.
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