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正交层状锰酸锂(o-LiMnO2)是高能量密度锂离子电池关键正极材料之一,是当前的研究热点。掺杂改性是提高晶体结构稳定性,改善循环性能的有效方法之一。采用水热法分别进行了Cr、Y、Mg掺杂实验及掺杂分析,得出了最优掺杂条件。在此实验基础上,以正交晶系法式方程,利用最小二乘法精确测定了o-LiMnO2最优掺杂量(4%Cr、4%Y(原子分数))的晶格常数,验证了对主体晶格的影响,与理论相吻合。并且通过计算Mg的不同掺杂量引起的晶格常数变化逆向证明了该方法的可靠性,得出对于层状结构6%Mg(原子分数)为最优掺杂比例。
Orthogonal layered lithium manganese oxide (o-LiMnO2) is one of the key cathode materials for high energy density lithium-ion batteries and is currently a hot research topic. Doping modification is one of the effective methods to improve the stability of the crystal structure and improve the cycle performance. Hydrothermal method were carried out Cr, Y, Mg doping experiments and doping analysis, obtained the optimal doping conditions. On the basis of this experiment, the lattice constants of the optimum doping amount of O-LiMnO2 (4% Cr, 4% Y (atomic fraction)) were determined by the method of least squares with the orthorhombic equation. The impact of the host lattice, consistent with the theory. And by calculating the variation of lattice constants caused by different doping amount of Mg, the reliability of this method is proved inversely, and the optimal doping proportion of 6% Mg (atomic fraction) is obtained for the layered structure.