Positive electrode material and preparation method and application thereof
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A technology of positive electrode material and average particle size, applied in the field of positive electrode material and its preparation, can solve problems such as poor voltage resistance performance
Pending Publication Date: 2022-06-03
BEIJING EASPRING MATERIAL TECH CO LTD
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[0008] The purpose of the present invention is to overcome the problem of poor pressure resistance of the positive electrode material in the prior art, to provide the positive electrode material and its preparation method and the application of the positive electrode material in lithium ion batteries
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Embodiment 1
[0098] S1: Dissolve nickel sulfate, cobalt sulfate and manganese sulfate in water according to the molar ratio of nickel, cobalt and manganese elements of 60:20:20 to obtain a mixed salt solution with a concentration of 2 mol / L; dissolving sodium hydroxide in water Dissolve to obtain a precipitant solution with a concentration of 8 mol / L; dissolve ammonia water in water to obtain a complexing agent solution I with a concentration of 5.2 mol / L and a complexing agent solution II with a concentration of 10.3 mol / L.
[0099] S2: According to the molar ratio of the mixed salt (based on the total molar amount of metal elements), the precipitating agent, the first complexing agent and the second complexing agent of 1:4:2.6:5.15, mix 100L of mixed salt solution The precipitating agent solution and the complexing agent solution I are passed into the reaction kettle in a co-current manner, and the first mixing is carried out for 18h under the conditions that the pH is 12.2, the temperatu...
Embodiment 2-9
[0107] The positive electrode material was prepared according to the method of Example 1. The ratio of raw materials and the specific process conditions were shown in Table 1, and the single crystal positive electrode materials Z2-Z9 were obtained, and the corresponding chemical formula was shown in Table 1. Wherein, the calcination products obtained in step S4 of Examples 2-9 all have single crystal structures, and the corresponding chemical formulas are shown in Table 1.
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Abstract
The invention relates to the field of lithium ion battery positive electrode materials, and discloses a positive electrode material and a preparation method and application thereof. The average particle size d50 and the particle size standard deviation dsigma of primary particles of the positive electrode material meet the following conditions: d50 is less than or equal to 40 microns, dsigma is greater than or equal to 0.25 microns, and 0.7 < = d50 / dsigma < = 120; the chemical formula of the positive electrode material is LiaNibCocMndMeOfJj, in the formula, 0.8 < = a < = 1.2, 0 < b < 1, 0 < c < 0.5, 0 < d < 0.5, 0 < e < 0.4, 1 < = f < 2, 0 < j < = 1, a + b + c + d + e = 2, and f + j = 2; wherein M is selected from at least one element of Ti, Zr, Nb, W, Al, Mg, V, Ca, Sr, Cr, Fe, Ga, In, Mo, Y, Sn, Cu, Ag, Zn, Na and Ba; j is selected from at least one element of S, Si, F and Cl. The positive electrode material provided by the invention is good in compaction performance, and the lithium ion battery prepared from the positive electrode material has relatively high first discharge specific capacity and cycle capacity retention rate.
Description
technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to positive electrode materials and a preparation method thereof, and applications of the positive electrode materials in lithium ion batteries. Background technique [0002] In view of the current shortcomings of lithium-ion batteries, the market has put forward higher requirements for lithium-ion batteries. High energy density, high safety, long cycle life, good thermal stability, and low cost have become key performance indicators for evaluating power batteries. Nickel-cobalt lithium manganate ternary cathode material combines the excellent properties of lithium nickelate, lithium cobaltate and lithium manganate, and has the characteristics of high specific capacity, long cycle life, and environmental friendliness. It is currently the most widely used lithium-ion battery. one of the materials. The common nickel-cobalt lithium manganate cathod...
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