Preparation method for positive electrode material lithium cobalt iron phosphate for lithium ion battery
A lithium ion battery, lithium cobalt iron phosphate technology, applied in the field of materials science, can solve the problems affecting the stability of LiCoPO4, affecting the crystal structure and lattice parameters, etc., to improve the electrical conductivity and ion migration rate, suppress agglomeration, and improve electrical conductivity. rate effect
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[0076] Battery preparation and electrochemical performance test method
[0077] (1) Preparation of battery positive sheet
[0078] The obtained cathode material for lithium ion battery lithium cobalt iron phosphate / carbon composite material, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) are mixed according to a mass ratio of 8:1:1 to obtain a mixed powder. Mix 10 grams of powder, add 35 grams of organic solvent N-methylpyrrolidone (NMP), stir thoroughly to form a slurry, coat it on the surface of the aluminum foil, dry it, and roll it several times to obtain a battery positive electrode sheet;
[0079] (2) Battery assembly and performance test
[0080] The electrochemical performance of the lithium cobalt iron phosphate / carbon composite material was evaluated using a 2016 type half-cell. The rolled battery pole pieces are stamped into 12 mm diameter discs. After accurately weighing their mass, the mass of the lithium cobalt iron phosphate / carbon composit...
Embodiment 1
[0083] A method for synthesizing lithium cobalt iron phosphate / carbon composite material, which is a positive electrode material for lithium ion batteries, specifically includes the following steps:
[0084] (1) Add 115 parts by weight of phosphoric acid to 400 parts by weight of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 50-60°C. Under stirring, 5.5 parts by weight of reduced iron powder was added and reacted for 2 hours to obtain mixed solution A.
[0085] (2) Dissolve 42 parts by weight of lithium hydroxide in 200 parts by weight of deionized water to form a lithium hydroxide solution, and then slowly add the lithium hydroxide solution dropwise to the mixed solution A obtained in step (1), and keep The solution is in a clear state. After the solution is naturally cooled to room temperature, it is added to the nano ball mill, and then 83 parts by weight of cobalt hydroxide are added. After ball milling for 3 hours, 80 par...
Embodiment 2
[0091] A method for synthesizing a lithium-ion battery cathode material lithium cobalt iron phosphate / carbon composite material, which specifically includes the following steps:
[0092] (1) Add 115 parts by weight of phosphoric acid to 400 parts by weight of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 50-60°C. Under stirring, 8.5 parts by weight of reduced iron powder was added and reacted for 2 hours to obtain mixed solution A.
[0093] (2) Dissolve 42 parts of lithium hydroxide in 200 parts of deionized water to form a lithium hydroxide solution, and then slowly add the lithium hydroxide solution to the mixed solution A obtained in step (1), keeping the solution in a clear State, after the solution is naturally cooled to room temperature, add into the nano ball mill, then add 78 parts by weight of cobalt hydroxide, after ball milling for 3 hours, then add 120 parts by weight of caramel solution with a concentration of 20%...
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