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W compound-coated lithium ion secondary battery positive electrode material and preparation method thereof

A technology for positive electrode materials and secondary batteries, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems that affect the wide application of high-nickel-based positive electrode materials, high irreversible capacity in the first discharge, and poor thermal stability. Conducive to shape control, consistent particle size, and adequate response

Inactive Publication Date: 2019-08-16
LONG POWER SYST NANTONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the traditional high-nickel material (LiNiO2) has high capacity, its cycle performance is poor, which affects the wide application of high-nickel cathode materials.
The positive electrode material after doping LiNiO2 with Co and Mn elements not only has a higher capacity, but also stabilizes the layered structure of the material, and also enhances the cycle performance of the material, but this material has poor overcharge resistance, thermal Poor stability performance, high irreversible capacity for the first discharge, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of binary precursor A2: Ni:Co:Mn=0.82:0.12:0.06 is formulated into 0.5mol / L mixed solution A1, and 1.5mol / L sodium hydroxide solution and 0.5mol / L ammonium sulfate solution are prepared; Inject pure water into the reaction vessel, and use 1.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 9.5, adjust the temperature in the reaction vessel to 40°C, and the rotation speed to 200r / min, and nitrogen gas; adjust the flow rate of the A1 solution At 20L / min, sodium hydroxide and ammonium sulfate are slowly added dropwise at the same time. When the particle size reaches the requirement, solid-liquid separation is performed and dried to obtain the desired precursor A2.

[0040] Preparation of W compound-coated lithium-ion secondary battery cathode material: Lithium hydroxide and A2 are mixed according to the ratio of the molecular formula LipNixCoyMnzO2, where p=1.06, x=0.82, y=0.12, z=0.06, and the sintering temperature is controlled...

Embodiment 2

[0042] Preparation of binary precursor A2: Ni:Co:Mn=0.82:0.12:0.06 is formulated into 0.5mol / L mixed solution A1, and 1.5mol / L sodium hydroxide solution and 0.5mol / L ammonium sulfate solution are prepared; Inject pure water into the reaction vessel, and use 1.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 10.5, adjust the temperature in the reaction vessel to 40°C, and the rotation speed to 200r / min, and feed nitrogen gas; adjust the flow rate of the A1 solution At the same time, sodium hydroxide and ammonium sulfate are slowly added dropwise. When the particle size reaches the requirement, solid-liquid separation is performed and dried to obtain the desired precursor A2.

[0043] Preparation of W compound-coated lithium-ion secondary battery cathode material: Lithium hydroxide and A2 are mixed according to the ratio in the molecular formula LipNixCoyMnzO2, where p=1.09, x=0.82, y=0.12, z=0.06, and the sintering temperature is controlled The...

Embodiment 3

[0045] Preparation of binary precursor A2 Ni: Co: Mn=0.82:0.12:0.06 is formulated into 0.5mol / L mixed solution A1, and 1.5mol / L sodium hydroxide solution and 0.5mol / L ammonium sulfate solution are prepared; Inject pure water into the container, and use 1.5mol / L sodium hydroxide solution to adjust the pH value of the initial solution to 10.5, adjust the temperature in the reaction container to 40°C, and the speed to be 200r / min, and nitrogen gas is introduced; the flow rate of the A1 solution is adjusted to 10L / min, slowly drop sodium hydroxide and ammonium sulfate at the same time, when the particle size reaches the requirement, perform solid-liquid separation and dry to obtain the required precursor A2.

[0046]Preparation of W compound-coated lithium-ion secondary battery cathode material: Lithium hydroxide and A2 are mixed according to the ratio in the molecular formula LipNixCoyMnzO2, where p=1.09, x=0.82, y=0.12, z=0.06, and the sintering temperature is controlled The tem...

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Abstract

The invention relates to a W compound-coated lithium ion secondary battery positive electrode material and a preparation method thereof. The W compound-coated lithium ion secondary battery positive electrode material comprises a positive electrode material and a W compound coated on the positive electrode material. The positive electrode material is composed of primary particles or secondary particles formed by aggregation of the primary particles or the mixed particles of the primary particles and the secondary particles. The preparation method comprises the following steps: (1) sintering (2)surface treatment (3) drying and sieving treatment. The binary precursor A2 is obtained by continuous co-precipitation reaction, the elements are mixed uniformly, the reaction is sufficient, the control of morphology is facilitated, continuous production is performed, the production efficiency is improved and the particle size is more consistent. The structure of the binary high nickel material is stabilized by doping appropriate elements, the alkali content is controlled by water washing and coating of the W compound is realized in the process of water washing so that the electrochemical performance of the battery can be enhanced and the safety and the high temperature performance of the battery material can be enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion secondary battery cathode material coated with a W compound and a preparation method thereof. Background technique [0002] Due to its superior capacity and power performance, high-nickel lithium-ion secondary batteries will become an important direction for the development of lithium batteries in the future, and can be used as ideal power battery materials. At the same time, compared with Co resources, because Ni resources are abundant, it is easy to achieve cost reduction. [0003] Although the traditional high-nickel material (LiNiO2) has high capacity, its cycle performance is poor, which affects the wide application of high-nickel cathode materials. The positive electrode material after doping LiNiO2 with Co and Mn elements not only has a higher capacity, but also stabilizes the layered structure of the material, and also enhances the cycle performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/36H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韩亮黄碧英徐伯雄丁孔贤
Owner LONG POWER SYST NANTONG CO LTD
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