A kind of high-capacity lithium-rich cathode material and preparation method thereof
A lithium-rich positive electrode material and high-capacity technology, applied in the field of electrochemistry, can solve the problems of reduced lithium ion diffusion rate, poor material cycle stability, and material structure collapse, and achieve improved cycle stability and high rate performance. The effect of low chemical resistance and high crystallinity
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Embodiment 1
[0046] The molar ratio is (0.54:0.13:0.13) to prepare manganese acetate, cobalt acetate, nickel acetate mixed solution, the total concentration of transition metal ions is 0.08mol / L, and the concentration of prepared urea solution is 0.16mol / L, which is 1 by volume ratio: 1 After mixing the two solutions for half an hour, transfer to a 100ml reaction kettle (50% fill). The reaction was carried out at 90°C for 3h, at 110°C for 3.5h, and finally at 170°C for 15h. Naturally cool to room temperature, suction filter, wash until the pH is about neutral, and dry at 50°C for 24 hours to obtain a carbonate precursor. It looks like figure 1 , the particles are spherical and uneven in size. From the enlarged picture of a single particle, it can be seen that spherical particles are aggregates formed by many nanoparticles, which are mesogens assembled and synthesized in situ by different components, with larger specific surface area and high porosity. Its XRD is figure 2 , with MnCO ...
Embodiment 2
[0049] According to the molar ratio (0.52:0.13:0.13:0.02), the mixed solution of manganese sulfate, cobalt sulfate, nickel sulfate and yttrium sulfate is prepared, the total concentration of transition metal ions is 0.08mol / L, and the concentration of prepared urea solution is 0.32mol / L. The ratio was 1:1. After mixing the two solutions for half an hour, they were transferred to a 100ml reactor (50% fill). The reaction was carried out at 90°C for 3h, at 110°C for 3.5h, and finally at 190°C for 15h. Naturally cool to room temperature, suction filter, wash until the pH is about neutral, and dry at 50°C for 24 hours to obtain a carbonate precursor. It looks like Figure 6 As shown, it is a spherical particle, a mesogenic material composed of many small particles.
[0050] According to the stoichiometric ratio = 1.2:0.8, lithium carbonate and precursor were weighed, and absolute ethanol was used as a dispersant, and the water bath was placed at 60°C until the absolute ethanol wa...
Embodiment 3
[0052] Manganese nitrate, cobalt nitrate, nickel nitrate and yttrium nitrate mixed solution are prepared in molar ratio (0.52:0.13:0.13:0.02), the total concentration of transition metal ions is 0.16mol / L, and the concentration of prepared urea solution is 0.40mol / L. The ratio was 1:1. After mixing the two solutions for half an hour, they were transferred to a 100ml reactor (50% fill). The reaction was carried out at 90°C for 3h, at 110°C for 3.5h, and finally at 210°C for 15h. Naturally cool to room temperature, suction filter, wash until the pH is about neutral, and dry at 50°C for 24 hours to obtain a carbonate precursor. It looks like Figure 8 As shown, the spherical particles are a mesogenic material composed of many small particles.
[0053] According to the stoichiometric ratio of 1.15:0.8:0.05, lithium hydroxide, precursor and sodium hydroxide were weighed, and anhydrous ethanol was used as a dispersant, and the water bath was placed at 60°C until the anhydrous etha...
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