Ternary material, preparation method thereof and battery slurry, positive electrode and lithium battery
A technology of ternary material and positive electrode, which is applied in battery slurry, positive electrode and lithium battery, ternary material and its preparation field, can solve the problems of difficult to agglomerate secondary spheres, large increase in internal resistance, large powder resistance, etc. Achieve the effect of increasing compaction density, improving safety performance, reducing thermal expansion and resistance changes
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[0036] At the same time, the present invention also provides a method for preparing a ternary material, which includes the following steps: S1, dissolving soluble nickel salt, cobalt salt, M salt, first lithium source, and oxidant system in a solvent In, prepare a mixed solution, the M is manganese or aluminum; S2, promote the oxidation reaction of the mixed solution, and filter, wash, and dry the oxidation reaction product after the reaction to obtain a precursor powder, and then in the precursor powder Mix the second lithium source to obtain the mixed powder; S3, perform primary sintering on the mixed powder to obtain a secondary ball; S4, perform secondary sintering on the secondary ball to obtain the ternary material; wherein, the The temperature of the secondary sintering is higher than the temperature of the primary sintering.
[0037] The method provided by the present invention can form the above-mentioned ternary material with three-level particles of the present inventi...
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[0064] Example 1
[0065] To illustrate the ternary material of the present invention and its preparation method, the specific preparation method is as follows:
[0066] 1mol of NiSO 4 ·6H 2 O (99.5% purity), 1molCoSO 4 ·7H 2 O (99.5% purity), 0.4molMnSO 4 ·H 2 O (purity 99.5%) is dissolved in 15L deionized water to form solution A, and 0.6molKMnO 4 (Purity is 99.7%) Dissolve in 1.5L deionized water to form solution B, add 3molLiOH·H 2 O, 6molNaOH and 0.6molNH 3 ·H 2 O was dissolved in 15L of deionized water to form solution C, and solutions A, B and C were added into the reaction kettle synchronously and simultaneously with metering pumps, and the reaction was stirred while adding dropwise. N 2 Protect the slurry from the atmosphere. After the addition is complete, continue to stir for 30 minutes to form a mixed solution (pH value 8.5), and then pump the obtained mixed solution into a 50L autoclave (filling degree is about 70%), and then Fill it with air (the oxygen content of the ...
Example Embodiment
[0069] Example 2
[0070] To illustrate the ternary material of the present invention and its preparation method, the specific preparation method is as follows:
[0071] Put 1.5mol of NiSO 4 ·6H 2 O (99.5% purity), 0.6molCoSO 4 ·7H 2 O (99.5% purity), 0.45molMnSO 4 ·H 2 O (purity is 99.5%) together with 15L deionized water to form solution A, 0.45molKMnO 4 Dissolve with 1.5L deionized water to form solution B, add 6molLiOH·H 2 O, 6molNaOH and 0.9molNH 3 ·H 2 O was dissolved in 15L of deionized water to form solution C, and solutions A, B and C were added into the reaction kettle synchronously and simultaneously with metering pumps, and the reaction was stirred while adding dropwise. N 2 Protect the slurry from atmosphere. After the addition, continue to stir for 30 minutes to form a mixed solution (pH value of 8.8), and then pump the obtained mixed solution into a 50L autoclave (filling degree is about 70%), and then Fill it with pure oxygen gas (oxygen content of 99.999%) to a pres...
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