Significant improvement in the energy density of lithium ion batteries (LIBs) is vital for its popularization in electric vehicle and energy storage devices toward sustainable society. While cathode materials are the dominant section of the whole battery system, 5 V-class cathode materials such as LiCo1-xFexPO4 (LCFP) become an attractive solution in recent years. Besides the difficulty in enhancing the cycling stability and the specific capacity of LCFP itself, capacity degradation due to the corrosion of Al foil current collector at high voltages (&gt;4.5 V) has inhibited LCFP–based cathodes from commercial utilization. In this study, a self-standing LCFP-based cathode free of the Al foil was constructed by combining carbon nanofiber (CNF) and LCFP. The composite cathode was fabricated by electrospinning CNFs into a platform first and then uniformly incorporating LCFP nanoparticles into the platform by solvothermal synthesis. Figure1 shows SEM images and XRD patterns of the LCFP@CNF cathode. It can be clearly observed that LCFP particles have an average diameter of ~200 nm and are homogeneously dispersed in the CNF platform. These nanosized grains contributes the facile electron migration and lithium-ion diffusion. The XRD patterns show the pure olivine structure with a Pnma space group, which can be attributed to LiCo0.8Fe0.2PO4. The lack of unindexed peak indicates that the absence of other phases in the LCFP@CNF cathode. Electrochemical analysis will be discussed in the poster presentation.

LiCo0.8Fe0.2PO4/carbon nanofiber self-standing cathodes for 5 V-class lithium ion batteries

2019 Spring National Meeting

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