| Compared to commercial LiFePO4, LiMnBO3also belongs to the anionic polymer cathode material, it has a higher theoretical specific capacity of220mAh·g-1and be more capable of the requirements for batteries of higher capacity. But it has the same disadvantage of low anionic and electronic conductivity by exploring different synthesis methods and the process condition, the properties of materials can be enhanced, which can provide experimental basis for marketization of LiMnBO3on a large scale.In this paper, h-LiMnBO3was successfully synthesized via mechanical activation-solid state method and spray drying-solid state method. Different testing methods, such as XRD, SEM, EDS, TEM and Raman were used to observe the structure, morphology and surface carbon coating of the samples. Electrochemical performance of LiMnB03material were tested by Galvanostatic and EIS methods, it is explored that the effects of different processing conditions on the physical and chemical properties of LiMnBO3.The initial discharge capacity has reached175.4mAh·g-1at the rate of0.05C,the discharge capacity remained at83.8%after ten cycles, compared to the reported,which illustrated a good electrochemical performance.On the basis of preparing h-LiMnBO3by mechanical activation solid state method, the material was modified by doping with Mn source. The analysis result of the test showed that it wouldn’t change the crystal structure of the main phase with a suitable metal doping, in the contrast, it would improve the electrochemical performance and ionic conductivity of the materials. It is found that the effect of Ni doping was largest, the initial discharge capacity of LiMn0.94Ni0.06BO3/C was132.3mAh·g-1at the rate of0.05C,what’s more, compared to the single-phase LiMnBO3,the value of AC impedance decreased significantly. |
