| 摘要 |
The present invention discloses a porous lithium manganese phosphate-carbon composite material, and a preparation and application thereof. Multiple nano-pores are distributed in the composite material, and the composite material comprises a lithium manganese phosphate material and 0.1 wt% to 30 wt% of carbon, wherein the carbon is at least from amorphous carbon, carbon nanotubes or carbon nanofibers. The method for preparing the porous lithium manganese phosphate-carbon composite material comprises the following steps of: mixing a porous pyrophosphate material with a doped metal source, a lithium source, phosphate and a carbon source and then drying them to obtain a reaction precursor, and calcining the reaction precursor at a constant temperature under a protective atmosphere to obtain the composite material. The lithium manganese phosphate material contains compounds in a general formula of LiMn x M 1-x PO 4 , and the porous pyrophosphate material contains compounds in a general formula of (Mn x M 1-x ) 2 P 2 O 7 and 0 wt% to 50 wt% of carbon, where M comprises a transition metal, and 0.6‰¤x‰¤1. When applied in batteries, for example, used as the cathode material of Li-ion secondary batteries, the composite material provided by the present invention is high in specific capacity, rate performance and tap density, low in the content of carbon, high in the content of active substance, simple in preparation and easy for large-scale production. |
