Enhancement of Electrochemical Performance of Li₄Ti₅O₁₂/C Composite Prepared by Sol-Gel Method

Abstract:

Phase pure Li4Ti5O12/C composite was synthesized by sol-gel method using lithium acetate CH3COOLi•2H2O and tetrabutyl titanate [Ti(OC4H9)4] as starting materials, oxalic acid as chelating agent and sucrose as an additional carbon source. The as-prepared samples were characterized by means of TG-DTA, XRD and SEM. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling and high-rate dischargeability. SEM analysis indicated that the prepared Li4Ti5O12/C composite using sucrose and oxalic acid as carbon source showed a spongy nano-particle aggregate structure, with average nano-particle size of 80-100 nm. Electrochemical results showed that the Li4Ti5O12/C composite prepared in the presence of sucrose exhibited better electrochemical performance with specific discharge capacities of 204.7, 171.6, 155.3 and 154.6 mAh/g at 0.2C, 1C, 2C, and 5C rates, respectively. And the discharge capacity could still reach 143.9mAh/g after 80 cycles at 1C rate, exhibiting excellent cycling performance.

• Periodical: Advanced Materials Research (Volume 178)
• Pages: 143-150
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.178.143
• Online since: December 2010
• Authors: Li Wang, Yu Shan, Zong Lin Zhang, Guang Chuan Liang, Xiu Qin Ou
• Keywords: Electrochemical Performance, Li₄Ti₅O₁₂, Oxalic Acid, Sol-Gel Method, Sucrose

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