LiMnPO4/C新奇结构锂离子电池正极材料

n alternate nanosheet/nanoparticle sandwich nanostructured LiMnPO4 cathode material is successfully synthesized by solvothermal process using oleic acid as the chelating agent. The size of the nanoparticles is as small as ca. 20 nm, which is important to avoid the agglomeration of the nanosheets from overlapping. The carbon-coated LiMnPO4 cathode delivers a discharge capacity of 154.3 mA h g-1 at 0.05 C, 150.1 mA h g-1 at 0.1 C, 133.2 mA h g-1 at 0.2 C, and even 72.6 mA h g-1 at 5 C rate, which is obviously better than that of the pure nanosheets counterpart. The rate capability and cycle life tests indicate that the sandwich nanostructured LiMnPO4/C cathode material also exhibits an excellent rate and cycle performance. The scanning electron microscopy, transmission electron microscopy, and N2 adsorption and desorption results confirm that the sandwich nanostructured LiMnPO4 with better dispersibility, higher surface area and broader mesoporous distribution is beneficial to decrease the lithium ion diffusion path, increase the electrolyte contact, and get the uniform post carbon-coating morphology.