Cathode active material of lithium ion battery as well as preparation method thereof
A positive electrode active material, lithium-ion battery technology, applied in the direction of battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems that are difficult to meet the requirements of practical applications, low capacity retention rate, large battery capacity attenuation, etc., to achieve Improved electrochemical performance, shortened diffusion distance, and excellent performance
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[0020] The embodiment of the present invention provides a kind of preparation method of lithium ion cathode active material, it comprises the following steps:
[0021] S1, providing Li source solution, +2 valent Ni source solution, +2 valent Co source solution, +2 valent Mn source solution and +6 valent Mo source solution;
[0022] S2, adding the Li source solution, +2 valence Ni source solution, +2 valence Co source solution, +2 valence Mn source solution and +6 valence Mo source solution into the polycarboxylic acid solution according to the stoichiometric ratio, stirring and mixing to form Sol;
[0023] S3, heating the sol at 50° C. to 80° C. to form a wet gel;
[0024] S4, spray drying the wet gel to obtain a dry gel;
[0025] S5, heating the dry gel at a first temperature and a second temperature in sequence, the first temperature is 400°C-500°C, and the first temperature is 750°C-850°C.
[0026] Specifically, in this step S1, Li source, +2 valence Ni source, +2 valenc...
Embodiment 1
[0041] Example 1 (x=0.01)
[0042] LiNO 3 , Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 Dissolve in water respectively to form a solution. Will MoO 3 Dissolved in ammonia water to form a solution. These solutions were separated by metal ions in Li[(Ni 0.8 co 0.1 mn 0.1 ) 0.99 Mo 0.01 ]O 2 The stoichiometric ratio was added to a stirred aqueous solution of citric acid to form a sol. The total molar concentration of metal ions in the sol is 2mol / L. The ratio of the molar weight of citric acid in the sol to the total molar weight of metal ions is 1:1. The sol was heated at 60° C. for 8 hours to obtain a transparent wet gel. The wet gel was spray-dried to obtain a transparent light green xerogel. The temperature of the hot air was 180°C when spray-drying the feed, and the temperature of the air after the xerogel was formed was 65°C-70°C. The obtained xerogel was heated at 500°C for 5 hours, and then heated at 750°C for 16 hours in an oxygen atmosph...
Embodiment 2
[0044] Example 2 (x=0.01)
[0045] The preparation method of the positive electrode active material and the test method of the battery are the same as in Example 1, except that the xerogel is heated at 500° C. for 5 hours, and then heated at 800° C. for 16 hours in an oxygen atmosphere.
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