Negative electrode material, its preparation method and application
A technology of negative electrode material and negative electrode active material, applied in the direction of negative electrode, battery electrode, active material electrode, etc., to achieve the effect of improving the first coulomb efficiency, battery capacity and specific energy
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[0024] The preparation method of the negative electrode material of the present invention comprises the following steps: S1, adding the negative electrode active material into the oxalic acid solution, fully stirring; S2, adding the lithium source solution into the material obtained in the step S1, and fully stirring; S3, obtaining the lithium source solution in the step S2 The material is dried at a drying temperature of 200-450° C.; and S4, the dried material in step S3 is sintered at 720-1000° C. under a carbon dioxide atmosphere.
[0025] In step S1, the mass ratio of negative electrode active material to oxalic acid is preferably 1000:8-20. The added oxalic acid increases the -H groups and -OH groups on the surface of the negative electrode active material, improving the hydrophilicity of the negative electrode active material. In the subsequent processing steps, the Li source solution can be wetted and combined with the surface of the negative electrode active material. ...
Embodiment 1
[0032] Take 56g of LiOH containing one crystal water, dissolve it in 400mL of deionized water, filter the impurities, and set aside.
[0033] Dissolve 15g of oxalic acid in 700mL of deionized water at 45°C, filter out impurities, and set aside.
[0034] Add 1Kg of artificial graphite into the above oxalic acid solution, the mixer speed is 500r / m, fully stir for about 1h, then stir while on, and slowly add lithium hydroxide solution until all are added, the time is about 20min, and then stir for 30min .
[0035] Then, in the process of stirring, spray drying is carried out, and the drying temperature is 250°C.
[0036] The spray-dried material is heated to 760°C at a constant speed in the muffle furnace under the protective atmosphere of carbon dioxide, kept for 10 minutes, and then cooled to collect the dry powder, passed through a 320-mesh sieve, and the finished product is collected.
Embodiment 2
[0038] Take 40g of LiOH containing one crystal water, dissolve it in 400mL of deionized water, filter the impurities, and set aside.
[0039] Dissolve 15g of oxalic acid in 700mL of deionized water at 45°C, filter out impurities, and set aside.
[0040] Add 1Kg of artificial graphite into the oxalic acid solution, the mixer speed is 500r / min, fully stir for about 1h, then stir while on, and slowly add the lithium hydroxide solution until all the addition is complete, the time is about 20min, and then stir for 30min.
[0041] While stirring, spray drying was carried out at a drying temperature of 250°C.
[0042] The spray-dried material is heated to 760°C at a constant speed in the muffle furnace under the protective atmosphere of carbon dioxide, kept for 10 minutes, and then cooled to collect the dry powder, passed through a 320-mesh sieve, and the finished product is collected.
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Abstract
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