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近些年来,因为具有低价、高容量和环境友好等特性,镍基材料在锂离子电池电极中表现出良好性能,得到重视。焦磷酸盐材料已经引起科研人员的兴趣(Co_2P_2O_7、Mn_2P_2O_7、Ni_2P_2O_7)。Ni_2P_2O_7是一种有前景的电极材料,但是由于锂离子在材料的嵌入与脱嵌过程中的体积变化和Ni_2P_2O_7容易集聚而导致差的循环稳定性。提高Ni_2P_2O_7电极性能的一个策略是加入还原氧化石墨烯(RGO),在作为电池正极时,Ni_2P_2O_7/RGO相较于Ni_2P_2O_7有更好的循环稳定性,这是因为RGO的导电性与弹性及Ni_2P_2O_7小的纳米尺寸。由于其多功能性,这种方法十分高效,可以用于改进其它有较大的体积变化和导电性差的材料。
In recent years, due to its low cost, high capacity, and environmental friendliness, nickel-based materials have shown great performance in lithium-ion battery electrodes. Pyrophosphate materials have aroused the interest of researchers (Co_2P_2O_7, Mn_2P_2O_7, Ni_2P_2O_7). Ni 2 P 2 O 7 is a promising electrode material, but due to the volume change of lithium ions during the process of intercalation and deintercalation of the materials and the easy agglomeration of Ni 2 P 2 O 7, Ni 2 P 2 O 7 leads to poor cycling stability. One of the strategies to improve the performance of Ni_2P_2O_7 electrode is to add reduced RGO. Ni_2P_2O_7 / RGO has better cycling stability than Ni_2P_2O_7 when used as the battery positive electrode because of the low conductivity and elasticity of RGO and the small size of Ni_2P_2O_7 Nanometer size. Due to its versatility, this method is very efficient and can be used to improve other materials that have large volumetric changes and poor conductivity.