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Doped ternary precursor, preparation method, positive electrode material and battery

A positive electrode material and doped technology, which is applied in the fields of doped ternary precursor, positive electrode material, preparation method, positive electrode material and battery, can solve the problem of high cost, achieve low equipment corrosion, simple raw materials, and avoid corrosion. Effect

Active Publication Date: 2021-06-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of positive electrode materials, the ternary precursor does not contain doping elements, and fluoride needs to be added again, which has the problem of high cost

Method used

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  • Doped ternary precursor, preparation method, positive electrode material and battery

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Effect test

Embodiment 1

[0046] This embodiment provides a preparation method for preparing positive electrode materials using doped ternary precursors. The preparation method specifically includes the following steps:

[0047] (I) Pickle the waste residue containing calcium fluoride and magnesium fluoride and filter to obtain the filter residue. The pickling process is carried out at a stirring speed of 200rpm and a heating temperature of 40°C for 1 hour, and pickling with an aqueous oxalic acid solution. The mass of oxalic acid is the mass of the waste residue 1%, the volume ratio of waste residue to water is 1:1, after washing the filter residue, perform wet ball milling for 75min, and the average particle size after ball milling is 0.9μm;

[0048] (II) Mix the ground calcium fluoride and magnesium fluoride with lye, adjust the pH to 10.5, raise the temperature to 55°C, and add 811 nickel-cobalt-manganese material solution, 6mol / L sodium hydroxide solution and 8mol / L The ammonia solution, the molar...

Embodiment 2

[0051] This embodiment provides a preparation method for preparing positive electrode materials using doped ternary precursors. The preparation method specifically includes the following steps:

[0052] (I) Pickle the waste residue containing calcium fluoride and magnesium fluoride and filter to obtain the filter residue. The pickling process is carried out at a stirring speed of 300rpm and a heating temperature of 50°C for 0.5h. Aqueous nitric acid solution is used for pickling. The quality of nitric acid is the waste residue 0.5% of the mass, the volume ratio of waste residue to solvent is 1:2, wet ball milling is carried out for 30min after filter residue washing, and the average particle size after ball milling is 1.1μm;

[0053] (II) Mix the ball-milled calcium fluoride and magnesium fluoride with lye, adjust the pH to 11, raise the temperature to 52°C, and add 831106 nickel-cobalt-manganese material solution, 6mol / L sodium hydroxide solution and 8mol / L The ammonia soluti...

Embodiment 3

[0056] This embodiment provides a preparation method for preparing positive electrode materials using doped ternary precursors. The preparation method specifically includes the following steps:

[0057] (I) Pickle the waste residue containing calcium fluoride and magnesium fluoride and filter to obtain the filter residue. The pickling process is carried out at a stirring speed of 250rpm and a heating temperature of 45°C for 1.5h. Aqueous hydrochloric acid is used for pickling. The quality of hydrochloric acid is the waste residue 0.3% of the mass, the volume ratio of waste residue to solvent is 1:1.5, after washing the filter residue, perform wet ball milling for 120min, and the average particle size after ball milling is 0.5μm;

[0058] (II) Mix the ball-milled calcium fluoride and magnesium fluoride with lye, adjust the pH to 11.7, raise the temperature to 58°C, and add 831106 nickel-cobalt-manganese material solution, 6mol / L sodium hydroxide solution and 8mol / L The ammonia ...

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Abstract

The invention provides a doped ternary precursor, a preparation method, a positive electrode material and a battery. Fluoride salt and alkali liquor are mixed to adjust pH value, a nickel-cobalt-manganese material is added, and the doped ternary precursor is prepared after reaction. According to the method, the fluoride salt is introduced in the precursor stage to serve as a seed crystal and reacts with the nickel-cobalt-manganese material to obtain the ternary precursor doped with metal elements and fluorine, for example, calcium ions, magnesium ions and fluorine ions do not need to be introduced through a coprecipitation method in the process of doping calcium, magnesium and fluorine, the purity of a mother liquor system is guaranteed, corrosion of the coprecipitation process to equipment and pipelines is avoided, and the method has the characteristics of simple preparation process, easily available raw materials, easiness in industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a positive electrode material, in particular to a doped ternary precursor, a preparation method, a positive electrode material and a battery. Background technique [0002] In the field of lithium batteries, high-nickel ternary cathode materials have high discharge specific capacity, but there are some safety problems. At present, doping is one of the technical means to solve safety problems. However, there are certain defects in the conventional co-precipitation method for doping elements. First, in the hydroxide precursor system, the co-precipitation of calcium is difficult, and it is often co-precipitated into the final material in the form of calcium sulfate, and calcium sulfate precipitates Incomplete, it is easy to remain in the mother liquor, and sulfate radicals are introduced into the final material, which makes the sulfur content of the final material relatively high, wh...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/052
CPCH01M4/62H01M4/505H01M4/525H01M10/052H01M2004/028Y02E60/10H01M4/36
Inventor 万江涛张宁张勇杰刘满库李子郯
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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