Modification method of single-crystal ternary positive electrode material

A cathode material and single crystal technology, which is applied in the field of modification of single crystal ternary cathode materials, can solve the problems of poor cycle performance, large polarization of lithium ion batteries, reduced structural stability of ternary cathode materials, etc. Internal resistance, the effect of improving cycle stability

Inactive Publication Date: 2020-12-15
宜宾锂宝新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the doping modification process in the prior art, the doped ion part does not enter the interior of the ternary positive electrode material, and a similar coating layer is formed on the surface of the material, thereby reducing the impact of the tern

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  • Modification method of single-crystal ternary positive electrode material
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  • Modification method of single-crystal ternary positive electrode material

Examples

Experimental program
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Example Embodiment

[0031] Example 1:

[0032] A single crystal material for preparation zirconium doped 0.5 CO 0.16 Zr 0.04 Mn 0.3 O 2 :

[0033] Ten element positive precursor Ni with a granulation of 3.8 μm 0.5 CO 0.2 Mn 0.3 (OH) 2 , Zirconium sulphate, in accordance with the mass ratio of the molar ratio of 1: 0.04, added to a container containing water, a mixture of 5-60 wt.%, A mixture of 5-60 wt.%, A spray dry, at a temperature of 400 ° C, In the air atmosphere and box furnace, the ventilation is 40 l / min for 10 h, which is a primary sintered material after pre-feeding.

[0034] After mixing the primary sintered material after the pre-fever is mixed with a molar ratio of (Ni + CO + Mn) / Li of 1: 0.525, at a temperature of 950 ° C, in the air atmosphere and box furnace, ventilation The amount was sintered under 40 l / min for 10 h to obtain a doped sintered material.

[0035] The above-mentioned doped primary sintered material was at a temperature of 200 ° C, in the air atmosphere and the bo...

Example Embodiment

[0036] Example 2:

[0037] Preparation of zirconium doped, zirconium zirconium zirconium-coated single crystal material LINI 0.5 CO 0.16 Zr 0.04 Mn 0.3 O 2 :

[0038] According to the molar ratio of 1: 0.04 ratio, 3.8 μm Ni 0.5 CO 0.2 Mn 0.3 (OH) 2 After mixing, zirconium sulfate is mixed, the mixture is added to a water solution, and a mixture of 5% wt is configured, and the spray drying is carried out after the ball milling is 0.5 h, and the dry mixture after drying is at a temperature of 400 ° C, in the air atmosphere In the box furnace, the ventilation is 40 l / min to sinter 10 h, which is a sintered material after pre-feeding;

[0039] After mixing the primary sintered material after pre-fever and lithium carbonate was mixed in a molar ratio of 1: 0.525, at a temperature of 950 ° C, in the air atmosphere and box furnace. The ventilation is 40 l / min for 10 h, resulting in a doped sintered material;

[0040] The above-mentioned doped primary sintered material is mixed with a...

Example Embodiment

[0045] Example 3:

[0046] Preparation of aluminum-doped single crystal material Lini 0.8 CO 0.1 Mn 0.06 Zr 0.04 O 2 :

[0047] According to the molar ratio of 1: 0.03 ratio, 3.4 μm Ni 0.8 CO 0.1 Mn 0.1 (OH) 2 After the aluminum nitrate, the mixture was added to the aqueous solution, and the mixture was configured to solidify the mixture of 30% wt. After 0.5 h, spray dried to obtain a mixture, and the dry mixture was at a temperature of 700 ° C at a temperature of 700 ° C, In the air atmosphere and box furnace, the ventilation is 40 l / min for 10 h, which is a sintered material after pre-feeding;

[0048] After mixing the primary sintered material after pre-fever and lithium hydroxide (Ni + CO + Mn) / Li moxiecetal, after mixing, at a temperature of 855 ° C, in the air atmosphere and box furnace, ventilation Sintering is 40 l / min for 10 h, resulting in a doped sintered material;

[0049] The above-mentioned doped primary sintered material was at a temperature of 600 ° C, in the...

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Abstract

The invention discloses a modification method of a single crystal ternary positive electrode material. The method comprises the following steps: mixing a precursor containing nickel, cobalt and manganese elements with a dopant metal soluble salt, adding pure water, uniformly stirring, and carrying out spray drying to obtain a pretreated precursor; carrying out low-temperature sintering on the pretreated precursor in an oxidizing atmosphere to obtain a low-temperature sintered product; and uniformly mixing the low-temperature sintering product with a lithium source, and carrying out high-temperature sintering in an oxidizing atmosphere to obtain the doped and modified single-crystal ternary positive electrode material. According to the invention, the precursor and the dopant are pre-sintered at a low temperature, most of the pre-sintered dopant uniformly coats the surface of the precursor in an oxide form, and then the pre-sintered precursor and the lithium salt are sintered at a high temperature, so that the dopant is prevented from forming an oxide coating layer on the surface of the ternary positive electrode material, and the internal resistance of the ternary positive electrodematerial is reduced; and the cycling stability of the lithium-ion battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, in particular to a method for modifying a single crystal ternary positive electrode material. Background technique [0002] In order to increase the energy density of power battery cells to 300wh / kg, an important technical approach is to increase the voltage of single crystal. High voltage, that is, single crystallization, is a very direct and effective solution to increase energy density. Increasing the charge cut-off voltage will increase the degree of delithiation of the positive electrode, and the corresponding charge and discharge capacity will also increase. Since the primary particles of single crystal products are much larger than those of polycrystalline products, the surface is smoother and the surface negative reaction can be reduced; the larger the primary crystal particles of ternary materials, the more complete the structure, and the higher the therma...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B1/10H01M4/505H01M4/525H01M10/0525
CPCC30B1/10C30B29/22H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈德贤张彬张郑颜华
Owner 宜宾锂宝新材料有限公司
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