Composite anode material, preparation method thereof and lithium ion battery comprising composite anode material
A technology for compounding cathode materials and cathode active materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of low energy density and room temperature conductivity, corrosion of cathode materials, and low theoretical capacity, etc., to improve Coulomb efficiency and cycle. Stability, improved cycle life, improved effect of volume expansion
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Embodiment 1
[0036]React 0.1mol cobalt nitrate and 0.3mol 2-methylimidazole in 20mL aqueous solution to obtain a complex solution, and combine the complex solution with 1,4-bis[(3,4-dioctyloxybenzene)-bisamide ] Benzene was dissolved in N,N-dimethylacetamide, heated to 50°C, stirred until dissolved to obtain an organic sol, after mixing evenly, continued to stir for 30 minutes, and aged for 6 hours to obtain cobalt-1,4-bis[ (3,4-dioctyloxybenzene)-bisamido]benzene gel;
[0037] Cobalt-1,4-bis[(3,4-dioctyloxybenzene)-diamido]benzene gel was calcined in argon at a temperature of 350°C for 3.5 hours to obtain cobalt / carbon skeleton;
[0038] Stir 0.1mol lithium hydroxide, 0.1mol cobalt nitrate, 0.05mol nickel nitrate, and 0.1mol ferrous hydrogen phosphate in 50mL of water to obtain a mixed solution, then transfer the cobalt / carbon skeleton and the mixed solution into the reactor, and The hydrothermal reaction was carried out at ℃, and LiCo was obtained after 6 hours of reaction 0.66 Ni 0....
Embodiment 2
[0047] (1) Preparation of positive electrode
[0048] Stir polyvinylpyrrolidone in dissolved water until it dissolves to obtain an organosol; react 0.1mol cobalt sulfate and 0.2mol 1,10-phenanthroline in 20mL of water to obtain a complex solution, and mix the complex solution with polyethylene Pyrrolidone was mixed with nitrogen methyl pyrrolidone, heated to 80°C, stirred for 35 minutes, and aged for 3 hours to obtain cobalt-polyvinylpyrrolidone gel;
[0049] The cobalt-polyvinylpyrrolidone gel was calcined in argon at a calcination temperature of 380°C and a calcination time of 4 hours to obtain a cobalt / carbon skeleton;
[0050] Stir 0.03mol of lithium phosphate, 0.075mol of cobalt sulfate, 0.025mol of zinc sulfate and 0.8mol of iron phosphorus source in 50mL of water to obtain a mixed solution, then transfer the cobalt / carbon skeleton and the mixed solution into the reaction kettle, at 150°C Carry out hydrothermal reaction, obtain LiCo after reaction 5.5h 0.75 Zn 0.25 PO...
Embodiment 3
[0056] React 0.1mol cobalt acetate and 0.4mol ethylenediamine in 20mL of water to obtain a complex solution, and mix the complex solution with N-(3,4-methoxybenzoyl)-N'-(4'-nitrate Benzoyl)hydrazine was dissolved in dimethyl sulfoxide, stirred at 60°C for 50min, and aged for 10h to obtain cobalt N-(3,4-methoxybenzoyl)-N'-(4'- Nitrobenzoyl) hydrazine gel;
[0057] The cobalt-N-(3,4-methoxybenzoyl)-N'-(4'-nitrobenzoyl)hydrazine gel was calcined in nitrogen, the calcination temperature was 400°C, and the calcination time was 4h. to obtain a cobalt / carbon framework;
[0058] Stir 0.1mol of lithium nitrate, 0.08mol of cobalt acetate, 0.02mol of manganese acetate and 0.12mol of ferrous hydrogen phosphate in 50mL of water to obtain a mixed solution. The hydrothermal reaction was carried out under the following conditions, and LiCo was obtained after 7 hours of reaction. 0.8 mn 0.2 PO 4 / C.
[0059] 95 parts by weight of LiCo 0.8 mn 0.2 PO 4 / C, 5 parts by weight of polydiphe...
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