Surface coated positive electrode material and preparation method thereof, and battery

A positive electrode material and surface coating technology, which is applied in the field of surface coated positive electrode materials and its preparation, can solve problems such as lithium ion mixing and side reaction intensification, cycle performance deterioration, and restrictions on large-scale application of ternary materials. Direct contact area, good protection effect, uniform and complete coating effect

Active Publication Date: 2019-05-14
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above transitions will gradually intensify with the increase of Ni content, which will lead to the deterioration of cycle performance, and the risk of lithium ion mixing and side reactions will also increase, which limits the large-scale application of ternary materials.

Method used

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  • Surface coated positive electrode material and preparation method thereof, and battery
  • Surface coated positive electrode material and preparation method thereof, and battery
  • Surface coated positive electrode material and preparation method thereof, and battery

Examples

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preparation example Construction

[0031] A method for preparing a surface-coated positive electrode material according to an embodiment of the present invention includes the following steps S1-S4:

[0032] S1. Surface treatment: mix the positive electrode material with a surfactant, let it stand, and filter to get the filter residue to obtain a surface modified positive electrode material. The surface modifier is a solution or water of a compound containing a hydroxyl group, a carboxyl group or a mercapto group.

[0033] S2. Adsorption of metal ions: mix the surface-modified positive electrode material with a coating agent, and filter to obtain the filter residue after standing still to obtain a positive electrode material with metal ions adsorbed on the surface. The coating agent is a solution containing metal cations.

[0034] S3. Sedimentation treatment: mix the positive electrode material with metal ions adsorbed on the surface with a precipitant, filter the filter residue after standing, and obtain the pos...

Embodiment 1

[0056] Weigh lithium hydroxide and nickel cobalt manganese precursor Ni according to the molar ratio of 1.08:1 0.8 co 0.1 mn 0.1 (OH) 2 , placed together in a planetary ball mill and mixed evenly. Then the material was heated at 1°C / min to 600°C for 6 hours, kept for 2 hours, then heated at 1°C / min to 800°C, and sintered for 12 hours. Finally, after cooling to room temperature with the furnace, the material is taken out, crushed and sieved to obtain the ternary cathode material.

[0057] Surface treatment: Dissolve an appropriate amount of 3-mercaptopropionic acid in deionized water to obtain solution A with a concentration of 0.5 mol / L. Subsequently, the above-mentioned ternary positive electrode material was dispersed in the solution A, stirred for 2 hours, then left to stand for 2 hours, and then filtered to obtain the filter residue A.

[0058] Metal ion adsorption: Al(NO 3 ) 3 aqueous solution, and the filter residue A was placed in the solution for 2 minutes, and ...

Embodiment 2

[0063] Weigh lithium hydroxide and nickel cobalt manganese precursor Ni according to the molar ratio of 1.08:1 0.8 co 0.1 mn 0.1 (OH) 2 , placed together in a planetary ball mill and mixed evenly. Then the material was heated at 1°C / min to 600°C for 6 hours, kept for 2 hours, then heated at 1°C / min to 800°C, and sintered for 12 hours. Finally, after cooling to room temperature with the furnace, the material is taken out, crushed and sieved to obtain the ternary cathode material.

[0064] Surface treatment: Dissolve an appropriate amount of 3-mercaptopropionic acid in deionized water to obtain solution A with a concentration of 0.5 mol / L. Subsequently, the above-mentioned ternary positive electrode material was dispersed in the solution A, stirred for 2 hours, then left to stand for 2 hours, and then filtered to obtain the filter residue A.

[0065] Metal ion adsorption: prepare SnCl with a concentration of 0.2mol / L 2 aqueous solution, and the filter residue A was placed ...

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Abstract

The invention relates to a surface coated positive electrode material and a preparation method thereof, and a battery; the preparation method comprises the following steps of surface treatment, metalion adsorption, deposition treatment and oxidation sintering. The method has the beneficial effects that the self-adsorption of metal cations is utilized, so that the obtained coating layer is uniformand complete, the direct contact area of the active substance and the electrolyte can be greatly reduced, and the risk of side reaction is reduced; the in-situ growth mechanism is adopted, so that the size of the deposited particles can be regulated and controlled, the size is between the nanometer crystal and micron interval, and the compactness of the coating layer is controlled; the thicknessof the coating layer can be adjusted and controlled by adjusting the number of deposition times of in-situ growth, so that a better protection effect can be obtained; an agglomeration phenomenon occurring during conventional wet-process coating can be avoided; an and the in-situ coating method is adopted, and severe stirring is not needed, so that physical crushing caused by secondary ball formingis avoided.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a surface-coated cathode material, a preparation method thereof, and a battery. Background technique [0002] At this stage, lithium-ion batteries are the main development direction, and among the positive electrode materials used in lithium-ion batteries, ternary positive electrode materials have shown an economical market share due to their high energy density and relatively low cost advantages. rising trend. The general chemical formula of the ternary cathode material is LiNi 1-x-y co x m y o 2 (M is Mn or Al), usually α-NaFeO 2 phase, with LiO 6 and MO 6 Octahedral alternating layered structure. Thanks to Li + The radius of 0.76nm, and Ni 2+ The 0.69nm is very close, so the two are driven by the redox force, easy to enter the layer structure of the other party to cause mixing, so that the effective Li that can fully participate in the redox reaction + The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 罗桂邓多赵德唐泽勋商士波
Owner 湖南桑瑞新材料有限公司
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