Preparation method of nano lithium-rich positive material capable of charging and discharging at high rate
A lithium-rich cathode material, charging and discharging technology, applied in battery electrodes, nanotechnology, circuits, etc., can solve the problems of difficult to achieve industrialization, low specific capacity, short cycle life, etc., to achieve good resistance to overload, comprehensive good performance
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Embodiment 1
[0039] (1) Co-precipitation steps to prepare nickel-cobalt-manganese carbonate precursor:
[0040] Such as figure 1, nickel sulfate, cobalt sulfate, manganese sulfate are formulated into a uniform solution of 2mol / L according to the metal ion ratio Ni:Co:Mn=1:1:3.7 of the prepared material, and a sufficient amount of sodium carbonate is weighed to be mixed with 2mol / L The solution is used as a precipitating agent, and simultaneously, saturated ammonia is added to the sodium carbonate solution to form a 0.3mol / L ammonia complexing agent. The concentration of the bottom liquid in the reactor is 0.125mol / L, and the ratio of nickel-cobalt-manganese metal ions is the same as that of the feed liquid. The solution was continuously added to the reactor at a rate of 2 mL / min, and the reaction continued for 30 h. Such as Image 6 In (a), the SEM morphology of the spherical precursor. After the reaction, the precursor in the kettle was left to stand for 2 hours, and then the precurso...
Embodiment 2
[0049] The positive electrode material with nanostructure was prepared without grinding, and the other reaction conditions and experimental methods were exactly the same as those in Example 1. Li prepared in this example 1.2 Ni 0.14 co 0.14 mn 0.52 o 2 Electrochemical performance curves of spherical lithium-rich cathode materials, such as Figure 7 shown. Figure 7 It is the 1C discharge cycle performance curve of the spherical lithium-rich cathode material of Example 2. It can be seen from the figure that the capacity and discharge capacity of the material continue to decrease after 200 cycles of charge and discharge cycles, indicating that the material has insufficient cycle stability at high rates. Although the initial discharge The capacity was greater than 200mAh / g, but dropped below 160mAh / g after 200 cycles.
Embodiment 3
[0051] The pH of the reaction solution was adjusted to 7, and the remaining reaction conditions and experimental methods were exactly the same as in Example 1. Li prepared in this example 1.2 Ni 0.14 co 0.14 mn 0.52 o 2 Electrochemical performance curves of nano-lithium-rich cathode materials, such as Figure 8 shown. Figure 8 It is the 1C discharge cycle performance curve of the nano-lithium-rich cathode material in Example 3. After the material prepared in this example passes through 200 cycles of charge and discharge cycles, the discharge capacity of the material does not drop at all, indicating that the cycle stability of the material is very good, but in The maximum capacity of the material during the entire cycle does not exceed 160mAh / g, and the specific capacity is too low. In summary, the nano-anode material prepared in Example 1 has both high capacity and cycle stability at high rates.
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