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Preparation method of high-nickel positive electrode material

A cathode material, high nickel technology, applied in the field of preparation of modified high nickel ternary cathode materials, can solve the problems of Li2CO3 flatulence, poor processing performance, affecting high temperature cycle and high temperature storage, etc., to reduce direct contact and processing. Good performance and the effect of improving thermal stability

Inactive Publication Date: 2019-05-24
浙江迈纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In this case, the material is easier to absorb water, the PH is higher, and the processing performance is deteriorated; and too much Li2CO3 will cause flatulence, which will affect high-temperature circulation and high-temperature storage

Method used

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  • Preparation method of high-nickel positive electrode material
  • Preparation method of high-nickel positive electrode material

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preparation example Construction

[0031] A preparation method of high-nickel positive electrode material, comprising the following steps:

[0032] (1) Preparation of substrate: uniformly mix Ni-containing hydroxide, lithium-containing compound, and doping element in a molar ratio of 1:1-1.30:0-0.1, and then mix them at 650-900°C Calcining at high temperature to obtain the substrate A;

[0033] (2) Add substrate A to the washing solution, the solid-to-liquid weight ratio of the substrate A and the washing solution is 2 to 0.5, and control the temperature of the washing solution at 0 to 65°C to oxidize the residual lithium carbonate and hydroxide on the surface Lithium is washed away. In order to prevent the precipitation of excessive structural lithium, a lithium-containing compound is added to the washing solvent, and the washed substrate is dried at a temperature of 100-200 ° C to obtain a mixture B;

[0034] (3) Mix the mixture B, the coating element and the lithium-containing compound uniformly at a molar ...

Embodiment 1

[0054] (1) first Ni 0.94 co 0.045 Al 0.015 (OH) 2.015 , Lithium hydroxide and dopant strontium oxide are uniformly mixed, and the metal molar ratio is M(Ni+Co+Al):M(Li):M(Sr)=1:1.05:0.01.

[0055] (2) The mixture is calcined at 725° C. for 13 hours under oxygen-enriched conditions, and then the sintered product is crushed and sieved to obtain the positive electrode material.

[0056] (3) Its pH is 12.03, and the residual lithium carbonate and lithium hydroxide on the surface account for 0.7038% and 0.3211% by weight of the positive electrode material respectively.

[0057] (4) Evaluation test of 18650 cylindrical batteries made of the obtained positive electrode material: the first effect and 0.2C gram capacity are 87.5% and 218.2mAh / g respectively; the capacity retention rate of 300 cycles at room temperature is 92.7% after cycling at 25°C ; High temperature cycle at 45°C, the capacity retention rate after 300 cycles is 94%; after high temperature storage at 60°C, the cap...

Embodiment 2

[0060] (1) first Ni 0.94 co 0.045 Al 0.015 (OH) 2.015 , Lithium hydroxide and dopant strontium oxide are uniformly mixed, and the metal molar ratio is M(Ni+Co+Al):M(Li):M(Sr)=1:1.05:0.01.

[0061] (2) The mixture is calcined at 725° C. for 13 hours under oxygen-enriched conditions, and then the sintered product is crushed and sieved.

[0062] (3) After mixing the crushed and sieved product obtained above with deionized water at a weight ratio of 1:1, the temperature of the deionized water is controlled to be 45° C. Lithium oxide, to prevent the transitional detachment of structural lithium), stirred and washed for 20 minutes, centrifuged to dry, and vacuum-dried at 150°C for 10 hours to obtain the positive electrode material.

[0063] (4) The test results showed that the pH was 11.33, and the residual lithium carbonate and lithium hydroxide on the surface accounted for 0.1356% and 0.1181% by weight of the positive electrode material, respectively.

[0064] (5) Evaluation ...

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Abstract

The invention discloses a preparation method of a high-nickel positive electrode material, which comprises the following steps: uniformly mixing up a Ni-containing hydroxide, a lithium-containing compound and a doping element, and calcining to obtain a base material A after the mixing operation; adding the base material A into a washing solution, controlling the temperature of the washing solution, washing away residual lithium carbonate and lithium hydroxide on the surface, adding a lithium-containing compound into the washing solution, and drying the washed base material to obtain a mixtureB; uniformly mixing the mixture B, a coating element and a lithium-containing compound, calcining, and crushing to obtain the finally modified high-nickel positive electrode material. The high-temperature stability of the nickel material is improved through doping. The residual lithium carbonate and lithium hydroxide on the surface are reduced through washing. The water absorption and processing performance of the material is improved. The damage to the surface of the material during washing can be repaired through coating. The direct contact between the positive electrode material and the electrolyte can be reduced, so that the high-temperature characteristic and long-cycle performance of the battery cell are improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method of a modified high-nickel ternary positive electrode material. Background technique [0002] The high-capacity, low-cost high-nickel ternary lithium-ion battery cathode material LiNi x Co y Mn 1-x-y O 2 (x≥0.8) has become the most promising cathode material for lithium-ion power batteries. The capacity of ternary materials varies with With the increase of nickel content, the content of free lithium on the surface of the corresponding material also increases, resulting in a high residual alkalinity of the material, and its surface structure will be destroyed during the repeated deintercalation of lithium ions, and it will react with the electrolyte. resulting in poor cycle performance. Therefore, the residual alkali on the surface of the material is reduced by washing with water, and at the same time, the surface of the material is coated to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCY02E60/10
Inventor 吴黎明潘刚平刘桥
Owner 浙江迈纳新材料有限公司
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