Ionic Liquid Assisted Electrospinning of Porous LiFe0.4 Mn0.6 PO4 /CNFs as Free-Standing Cathodes with a Pseudocapacitive Contribution for High-Performance Lithium-Ion Batteries.

Abstract

In pursuit of high-performance cathode materials for lithium-ion batteries with high energy and power densities, porous LiFe0.4 Mn0.6 PO4 /CNF free-standing electrodes have been successfully prepared through a facile ionic liquid (IL) assisted electrospinning method. Owing to the hierarchical porosity and N-doped carbon layer derived from the ionic liquid, the resulting electrodes exhibited superior electrochemical performances with an improvement of conductivity and pseudocapacitive contribution, delivering a discharge capability of 162.7, 133.5, 114.5, and 102.6 mAh g-1 at the current rates of 0.1, 1, 5, and 10 C, respectively. It is highly expected that this facile IL-assisted electrospinning method will lead to further developments for other phosphate-based free-standing electrodes, which offers a new route in designing polyanionic cathodes for high-performance Li-ion batteries.