Lithium-deficient and Lithium-excess spinels Li_xMn_1.6Ni_0.4O₄ (x = 1.05, 0.9) were synthesized by co-precipitation method assisted by ethylene glycol-oxalic acid. Control of cooling rates was performed in order to improve the crystallographic order, the lattice parameters and avoid the impurity precipitation. The samples were characterized physically and electrochemically. The best electrochemical performances were obtained for lithium-deficient spinels cooled at intermediate rates (2.2 °C min⁻¹). For this optimized material, the discharge capacity was 122 mA h g⁻¹ at 0.5C rate, retaining >83% of capacity at 10C rate and having good cycle life with >93.5% of initial capacity after 100 cycles at 0.5C rate.

通过乙二醇-草酸的共沉淀法合成了锂不足和锂过量的尖晶石Li _x Mn _1.6 Ni _0.4 O ₄（x = 1.05，0.9）。为了改善结晶顺序，晶格参数并避免杂质沉淀，进行了冷却速率的控制。对样品进行物理和电化学表征。对于以中速（2.2°C min ^-1）冷却的缺锂尖晶石，可获得最佳的电化学性能。对于这种优化的材料，放电容量为122 mA h g ^-1 在0.5C速率下以0.5C的速率保持大于83％的容量，并具有良好的循环寿命，在100个周期下具有大于初始容量的93.5％的循环寿命。