LiMn_0.8Fe_0.2PO₄/C Nanoparticles via Polystyrene Template Carburizing Enhance the Rate Capability and Capacity Reversibility of Cathode Materials

Abstract

In order to unlock the electrochemical performance ability of manganese-based lithium ferromanganese phosphate cathode materials, CP 1 −LiMn 0.8 Fe 0.2 PO 4 /C (coprecipitation) nanocomposites were prepared by introducing polystyrene nanospheres as templates and carbon sources into the coprecipitation method combined with a multistage carburizing heat treatment. In the processes of heat treatment, polystyrene nanospheres can not only build a conductive carbon layer and optimize the electron transport path but also refine the particles and inhibit the nanoparticle aggregation. The interconnected conductive carbon coating significantly improves the diffusion coefficient of lithium ions, which assists LiMn 0.8 Fe 0.2 PO 4 in lifting discharge specific capacity and cycle performance. The test results show that the as-prepared CP 1 −LiMn 0.8 Fe 0.2 PO 4 /C shows superior rate capability (130.5 mAh g −1 at 0.1C and 92.8 mAh g −1 at 5C) and capacity reversibility (95.5% after 200 cycles at 0.5C).

Na Doping and CeO2 Nanoparticle Surface Modification Enhancing the Li-Rich Li1.2Mn0.54Ni0.13Co0.13O2 Cathode Material for a Lithium-Ion Battery

“…Nowadays, lithium-ion batteries (LIBs) are crucial for storing energy in various electronic systems. The high-energy-density demands of modern society cannot be satisfied by the limiting capacity and voltage of conventional LiCoO 2 and LiFePO 4 cathode materials . Currently, the Li-rich Mn-based cathode (LMR, x Li 2 MnO 3 (1 – x )­LiMO 2 , M = Mn, Ni, Co) is considered to be one of the most promising cathode material for LIBs, owing to its large discharge capacity (>250 mAh g –1 ). , However, some unresolved issues have been encountered for commercial applications.…”