Electrode material lithium supplementing additive, preparation method and application thereof and lithium ion battery
A lithium-ion battery and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult storage, air sensitivity, and complicated preparation process
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preparation example Construction
[0037] The second aspect of the present invention provides a preparation method of an electrode material lithium supplement additive, the method comprising:
[0038] (1) polymer lithium salt, carbon source and solvent are mixed;
[0039] (2) performing solid-liquid separation on the material obtained by mixing step (1);
[0040] (3) heat-treating the solid matter obtained by the solid-liquid separation.
[0041] According to the present invention, the selection of the lithium polymer salt is as described above, and will not be repeated here.
[0042] Wherein, the lithium polymer salt can be obtained commercially or by preparation, which is not particularly limited in the present invention. For example, the lithium polypropionate can be obtained by reacting polyacrylic acid and lithium salt (preferably lithium hydroxide). The lithium polymethylpropionate can be obtained by reacting polymethacrylic acid and lithium salt (preferably lithium hydroxide). The polylithium maleate...
specific Embodiment approach
[0049] According to a specific embodiment of the present invention, the method includes, after the mixing in step (1), performing solid-liquid separation on the mixed material, and performing the heat treatment on the solid obtained from the solid-liquid separation. The separation can be a conventional separation method in the art, such as centrifugation.
[0050] According to a specific embodiment of the present invention, the method further includes drying the solid matter before the heat treatment, preferably, the drying temperature is 80-150° C., and the drying time is 2-8 hours.
[0051] According to the present invention, preferably, the conditions of the heat treatment include: the temperature is 550-700°C, and the time is 0.5-2h; more preferably, the temperature is 600-650°C.
[0052] The present invention has no special limitation on the heating rate of the heat treatment, for example, it may be 1-10° C. / min. In the embodiment of the present invention, 5° C. / min is t...
preparation example 1
[0070] Take 10 g of polyacrylic acid with a weight average molecular weight of 240,000 and add it to 40 g of deionized water to prepare a polyacrylic acid solution with a mass fraction of 20%. Weigh 3.4g of lithium hydroxide, add it to the above polyacrylic acid solution, heat and stir at 40°C until all solids are dissolved, and dry at 100°C for 4h to obtain lithium polyacrylate-1.
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