AUTHOR=Zeng Xianguang , Peng Jing , Zhu Huafeng , Gong Yong , Huang Xi 

TITLE=Cr-Doped Li2ZnTi3O8 as a High Performance Anode Material for Lithium-Ion Batteries

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.600204

DOI=10.3389/fchem.2020.600204

ISSN=2296-2646

ABSTRACT=<p>Li<sub>2</sub>ZnTi<sub>2.9</sub>Cr<sub>0.1</sub>O<sub>8</sub> and Li<sub>2</sub>ZnTi<sub>3</sub>O<sub>8</sub> were synthesized by the liquid phase method and then studied comparatively using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), galvanostatic charge–discharge testing, cyclic stability testing, rate performance testing, and electrochemical impedance spectroscopy (EIS). The results showed that Cr-doped Li<sub>2</sub>ZnTi<sub>3</sub>O<sub>8</sub> exhibited much improved cycle performance and rate performance compared with Li<sub>2</sub>ZnTi<sub>3</sub>O<sub>8</sub>. Li<sub>2</sub>ZnTi<sub>2.9</sub>Cr<sub>0.1</sub>O<sub>8</sub> exhibited a discharge ability of 156.7 and 107.5 mA h g<sup>−1</sup> at current densities of 2 and 5 A g<sup>−1</sup>, respectively. In addition, even at a current density of 1 A g<sup>−1</sup>, a reversible capacity of 162.2 mA h g<sup>−1</sup> was maintained after 200 cycles. The improved electrochemical properties of Li<sub>2</sub>ZnTi<sub>2.9</sub>Cr<sub>0.1</sub>O<sub>8</sub> are due to its increased electrical conductivity.</p>