A superior Li2SiO3-Composited LiNi0.5Mn1.5O4 Cathode for High-Voltage and High-Performance Lithium-ion Batteries

Abstract In this work, Li 2 SiO 3 , a layer-structured fast Li + -ion conductor with three-dimensional Li + paths, has been firstly introduced into LiNi 0.5 Mn 1.5 O 4 to form novel cathode composites of (1-x)LiNi 0.5 Mn 1.5 O 4 ·xLi 2 SiO 3 via a citric acid-assisted sol-gel method. The effects of Li 2 SiO 3 on the phase structure, morphology and electrochemical performance of the materials were investigated. As x increases, the structure and electrochemical properties of the materials are tailored. The cathode material with x = 0.10 delivers ultrahigh initial discharge capacity ∼150.3 mAh g −1 , which is 24.4% larger than that of the pristine LiNi 0.5 Mn 1.5 O 4 (120.8 mAh g −1 ). The Li 2 SiO 3 -composited LiNi 0.5 Mn 1.5 O 4 materials present an enhanced cycling stability, better rate performance and lower charge transfer resistance. These excellent electrochemical properties indicate that the compositing of fast Li + -ion conductor Li 2 SiO 3 is an effective method to enhance the electrochemical performance of LiNi 0.5 Mn 1.5 O 4 -based cathode materials.