Synthesis of Integrated Layered‐Spinel Composite Cathode Materials for High‐Voltage Lithium‐Ion Batteries up to 5.0 V

Abstract

Abstract Integrated layered‐spinel composite materials are synthesized through the facile decomposition of Li 4 Mn 5 O 12 ‐based spinel materials at 900 °C. The intergrowth of spinel Li 1+ z Mn 2− z O 4 (0< z <0.33) and Li‐rich layered Li 2 MnO 3 components is examined by using X‐ray diffraction and high‐resolution transmission electron microscopy. Such a layered‐spinel composite material and its derivatives obtained by doping transition‐metal ions are evaluated as high‐voltage cathode materials for advanced lithium‐ion batteries up to 5.0 V versus Li/Li + . The Ni‐doped composite cathode shows remarkably high‐energy and high‐power characteristics with high‐voltage plateaus at approximately 4.7 V, delivering desirable discharge capacities of 130, 115, and 90 mAh g −1 at current densities of 25, 125, and 500 mA g −1 , respectively, along with excellent cycling stability. This work provides a facile route for preparing the integrated layered‐spinel composite materials as promising high‐voltage cathode materials for lithium‐ion batteries.