Al doping effects on LiCrTiO4 as an anode for lithium-ion batteries

Abstract

Al-Doped LiCrTiO₄ anode materials are successfully synthesized by a conventional solid-state reaction. Their structural and electrochemical properties are systematically investigated. With increasing the Al doping level (x), the lattice parameters of LiAl_xCr_1−xTiO₄ get smaller. Meanwhile, asymmetric polarization was significantly reduced during the charge/discharge process, in contrast to an enhanced compatibility of electrode materials with organic electrolyte. The Al-doped LiAl_0.2Cr_0.8TiO₄ anode can still keep a discharge capacity of 123 mA h g⁻¹ at 1C for 100 cycles and 109 mA h g⁻¹ at 2C. More importantly, the Al-doped LiAl_0.2Cr_0.8TiO₄ anode exhibits remarkable electrochemical properties at a high-temperature of 60 °C with a very stable capacity of about 145 mA h g⁻¹ at 1C, and is promising as a high-performance anode.