AUTHOR=Xiao Hui , Huang Xiaobing , Ren Yurong , Ding Xiang , Zhou Shibiao 

TITLE=Fabrication of Li4Ti5O12@CN Composite With Enhanced Rate Properties

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00432

DOI=10.3389/fchem.2019.00432

ISSN=2296-2646

ABSTRACT=<p>Folic acid is first time applied as a carbon-nitrogen precursor to fabricate Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>@CN composites via ball milling Nano-TiO<sub>2</sub>, Li<sub>2</sub>CO<sub>3</sub> and folic acid with ethanol as solvent, and then followed by heating treatment in argon. XRD, SEM, TEM, XPS, charge-discharge test and EIS are used to evaluate the influence of N-doped carbon coating on its structure, morphologies and electrochemical property. It is demonstrated that the N-doped carbon coated Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> composite exhibits superior high-rate performance compared with pure Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>. It possesses a high discharge capacity of 174, 165 mAh g<sup>−1</sup> at 0.5 and 10 C, respectively. Additionally, an initial specific capacity of 96.2% is obtained after 200 cycles at 10 C. The remarkable performance might be put down to the N-doped carbon layer providing efficiently electron conductive network and nanosized decreasing lithium ion diffusion path.</p>