材料科学
阳极
钛酸锂
化学工程
锂(药物)
复合数
电解质
电化学
石墨
电极
碳纤维
复合材料
锂离子电池
电池(电)
工程类
内分泌学
物理化学
功率(物理)
化学
物理
医学
量子力学
作者
Jihyun Park,Seok‐Won Kang,Tae‐Soon Kwon,Ho Seok Park
标识
DOI:10.1016/j.ceramint.2017.10.217
摘要
Spinel crystalline lithium titanium oxide (Li4Ti5O12 or LTO) has gained attention as a possible alternative material to graphite for use as anodes in lithium-ion rechargeable batteries due to its low volume expansion and dendrite-free long-term stability. However, the rate capability of LTO is limited by its low electronic conductivity, which results in a large polarization resistance between electrodes. In this study, we demonstrate a spray-drying-assisted carbon coating approach to synthesize LTO/C composites for enhanced lithium-insertion capacity and facilitated charge-discharge reaction kinetics. The thin carbon layer of LTO/C composite contributes to suppressing particle growth by forming passivating carbon layers. In addition to the decrease in particle size for short lithium-diffusion pathways, the highly conductive carbon layers reduce the interfacial resistance between the electrode and electrolyte by enhanced electrical conductivity. The electrochemical performances of the spray-drying-prepared LTO/C composite such as the specific capacity, cycle and rate capabilities, and impedance are compared with pristine LTO and carbon-coated LTO synthesized without spray-drying. The LTO/C prepared from glucose exhibits a 11.15% enhancement in rate characteristics of pristine LTO at 0.5 C after 100 cycles. These results indicate that the carbon coating layer promotes charge transfer and ion diffusion as well as provides a buffering effect for improved rate and cyclic capabilities.
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