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Y-doped CaMnO3 coated ternary positive electrode material and preparation method thereof

A technology of positive electrode material and ternary material, which is applied in Y-doped CaMnO3-coated ternary positive electrode material and its preparation field, can solve the problem of low conductivity of ternary positive electrode material, achieve the goal of improving conductivity and cycle performance Effect

Active Publication Date: 2018-10-19
格林美(湖北)新能源材料有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a Y-doped CaMnO 3 Coated ternary positive electrode material and preparation method thereof, aiming to solve the technical problem of low electrical conductivity of existing ternary positive electrode materials

Method used

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  • Y-doped CaMnO3 coated ternary positive electrode material and preparation method thereof
  • Y-doped CaMnO3 coated ternary positive electrode material and preparation method thereof
  • Y-doped CaMnO3 coated ternary positive electrode material and preparation method thereof

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preparation example Construction

[0015] Y-doped CaMnO provided by the invention 3 The preparation method of the coated ternary cathode material comprises the following steps:

[0016] Step S1, the ternary material precursor Ni x co y mn 1-x-y (OH) 2 It is blended with lithium source in a certain proportion, and mixed with absolute ethanol or propanol at the same time, and then sintered, crushed, and sieved to obtain a sintered product.

[0017] In this step, the lithium source is LiOH, Li 2 CO 3 or Li 2 C 2 o 4 , the ternary material precursor and the lithium source are formulated according to the molar ratio of 1.00≤Li:(Ni+Co+Mn)≤1.10, and the mass of the ternary material precursor is 10% to 50%, adding absolute ethanol or propanol and mixing for 0.5 to 2 hours , and then sintered at 700-900°C for 5-10 hours, then crushed and sieved to obtain the primary sintered product LiNi x co y mn 1-x-y o 2 , where, 0.6≤x≤0.7, 0.1≤y≤0.2.

[0018] Step S2, dissolving the calcium source and the manganese sou...

Embodiment 1

[0027] 1) 100g ternary material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Prepare with LiOH according to the molar ratio of Li:(Ni+Co+Mn)=1.06, add 40g of absolute ethanol and mix for 0.5-2h, then sinter at 750°C for 8h, then pulverize and sieve to obtain the primary sintered product LiNi 0.6 co 0.2 mn 0.2 o 2 .

[0028] 2) Calcium carbonate and manganese oxide were dissolved in absolute ethanol according to the molar ratio of Ca:Mn=1:1, and stirred and mixed at 25°C for 2 hours to form a gel-like sol. Then the sol was sintered at 950°C for 5 hours to obtain CaMnO 3 . Finally CaMnO 3 Crush to below 200nm.

[0029] 3) Firstly, the YOH sol was diluted 10 times with ultrapure water and then mixed uniformly with the primary sintered product described in step 1), stirred and evaporated to dryness for 3 hours until the material was in powder form, and the water content on the surface of the material was 400ppm.

[0030] 4) Step 2) the pulverized CaMnO 3 Mix evenly with the e...

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Abstract

The invention belongs to the field of lithium batteries, and provides a Y-doped CaMnO3 coated ternary positive electrode material and a preparation method thereof. The preparation method comprises: preparing a nickel-cobalt lithium manganate primary sintering product, preparing CaMnO3, crushing, diluting an yttrium hydroxide sol, uniformly mixing the diluted yttrium hydroxide sol and the primary sintering product, carrying out stirring evaporating until the material is powdery, uniformly mixing the crushed CaMnO3 and the evaporated product, sintering, crushing, screening, and removing iron toobtain the finished product nickel-cobalt lithium manganate ternary positive electrode material. According to the present invention, the matrix of the ternary positive electrode material is the Y element-doped nickel-cobalt lithium manganate, such that the crystal structure of the ternary material can be stabilized, and the cycle performance of the material can be improved; and the Y element enters the CaMnO3 coating layer so as to improve the conductivity of the coating layer.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a Y-doped CaMnO 3 Covered ternary cathode material and preparation method thereof. Background technique [0002] Ternary lithium battery cathode materials have high energy density and relatively simple preparation process, and are widely used in digital products, electric tools, new energy vehicles and other fields. In recent years, traditional small and low-power lithium batteries can no longer fully meet the market demand. Some electric tools, aircraft models and other electronic products require batteries to be able to discharge at a high rate; the development of new energy vehicles also requires lithium batteries to require large discharge current and high power. new requirements. The safety, high-rate charge-discharge performance, and cycle performance of ternary cathode materials have always been the focus of attention. In terms of safety, surface modification is usually...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 许开华惠科石徐世国陈玉君张文艳
Owner 格林美(湖北)新能源材料有限公司
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