期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 19, 页码 10250-10257出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00776
关键词
lithium titanate; nitrogen-doped carbon coating; anode; lithium ion battery; high power density
资金
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2010-C1AAA001-2010-0028958]
- KIST institutional program
Nitrogen-doped carbon is coated on lithium titanate (Li4Ti5O12, LTO) via a simple chemical refluxing process, using ethylenediamine (EDA) as the carbon and nitrogen source. The process incorporates a carbon coating doped with a relatively high amount of nitrogen to form a conducting network on the LTO matrix. The introduction of N dopants in the carbon matrix leads to a higher density of C vacancies, resulting in improved lithium-ion diffusion. The uniform coating of nitrogen-doped carbon on Li4Ti5O12 (CN-LTO) enhances the electronic conductivity of a CN-LTO electrode and the corresponding electrochemical properties of the cell employing the electrode. The results of our study demonstrate that the CN-LTO anode exhibits higher rate capability and cycling performance over 100 cycles. From the electrochemical tests performed, the specific capacity of CN-LTO electrode at higher rates of 20 and 50 C are found to be 140.7 and 82.3 mAh g(-1)., respectively. In addition, the CN-Li4Ti5O12 anode attained higher capacity retention of 100% at 1 C rate after 100 cycles and 92.9% at 10 C rate after 300 cycles.
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