In this research, the boron-doped graphene-decorated and carbon-coated LiFePO₄ composite has been successfully designed and fabricated through a facile sol-gel approach followed by the thermal treatment. XRD results reveal that the as-fabricated composite shows a well-crystallized LiFePO₄ phase without no other impurities. The well-dispersed carbon-coated LiFePO₄ particles are embedded in the boron-doped graphene sheets, forming the effective conductive networks. Compared with the carbon-coated LiFePO₄ electrode, the boron-doped graphene-decorated and carbon-coated LiFePO₄ composite displays superior rate capability and cyclic stability when used as cathode material for lithium-ion batteries. Electrochemical performances indicate that the boron-doped graphene-decorated and carbon-coated LiFePO₄ electrode exhibits a high reversible capacity of 162.2 mAh g⁻¹ at 0.1C. Even at a high rate of 20C, it can still deliver a high discharge capacity of 109.9 mAh g⁻¹ after 200 cycles with a capacity retention of 95.2%, demonstrating a stable cyclic performance.

在这项研究中，已成功地设计了硼掺杂的石墨烯修饰和碳包覆的LiFePO ₄复合材料，并通过简单的溶胶-凝胶方法随后进行了热处理。XRD结果表明，所制造的复合材料显示出良好结晶的LiFePO ₄相，没有其他杂质。分散良好的碳包覆的LiFePO ₄颗粒嵌入掺硼的石墨烯片中，形成有效的导电网络。与碳包覆的LiFePO相比₄电极，所述掺硼的石墨烯的装饰和碳涂覆的LiFePO ₄当用作锂离子电池的正极材料时，复合材料显示出优异的倍率性能和循环稳定性。电化学性能表明，掺硼的石墨烯修饰的碳涂覆的LiFePO ₄电极在0.1C时具有162.2 mAh g ^-1的高可逆容量。即使在20℃的高速率下，它在200次循环后仍可提供109.9mAh g ^-1的高放电容量，容量保持率为95.2％，表现出稳定的循环性能。