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Doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

A cathode material, a lithium-rich manganese-based technology, which is applied in the field of doped lithium-rich manganese-based cathode materials and their preparation, can solve the problems of the preparation method to be improved, the material consistency is poor, and the actual performance is affected.

Pending Publication Date: 2021-05-14
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The materials prepared by this method usually have poor material consistency due to uneven dispersion of elements, which affects the actual performance.
[0006] In summary, the existing doped lithium-rich manganese-based cathode materials and their preparation methods still need to be improved

Method used

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  • Doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Doped lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Nickel sulfate, manganese sulfate, ruthenium chloride are mixed according to molar ratio as 25:70:5 and are formulated into the inorganic salt solution A that total metal ion concentration is 2mol / L;

[0050] (2) sodium hydroxide is mixed with complexing agent to form alkaline solution B, wherein the concentration of sodium hydroxide is 170g / L, and the concentration of complexing agent is 15g / L;

[0051] (3) Co-precipitation reaction kettle is used, the reaction conditions are controlled to be pH 10.20, the reaction temperature is 55°C, the reaction time is 22h, the stirring rate is 450r / min, the precursor with a particle size of 3-5μm is filtered, and washed to remove After sulfuric acid radicals and other residues were left, they were dried to obtain sample C;

[0052] (4) Mix sample C with lithium carbonate at a molar ratio of 1:1.47, raise the temperature from room temperature to 550 °C at a rate of 10 °C / min, keep the temperature constant for 5 hours, and then ...

Embodiment 2

[0060] (1) Nickel sulfate, manganese sulfate, lanthanum chloride are mixed according to the molar ratio of 25:70:5 and are formulated into the inorganic salt solution A that the total metal ion concentration is 2mol / L;

[0061] (2) sodium hydroxide is mixed with complexing agent to form alkaline solution B, wherein the concentration of sodium hydroxide is 170g / L, and the concentration of complexing agent is 15g / L;

[0062] (3) Co-precipitation reaction kettle is used, the reaction conditions are controlled at pH 10.2, the reaction temperature is 55°C, the reaction time is 22h, the stirring rate is 400r / min, the precursor with a particle size of 3-5μm is filtered, and washed to remove After sulfuric acid radicals and other residues were left, they were dried to obtain sample C;

[0063] (4) Mix sample C with lithium carbonate at a molar ratio of 1:1.47, raise the temperature from room temperature to 550 °C at a rate of 10 °C / min, keep the temperature constant for 5 hours, and t...

Embodiment 3

[0071] (1) Nickel sulfate, manganese sulfate, magnesium nitrate are mixed according to the molar ratio of 25:70:5 and are formulated into the inorganic salt solution A that total metal ion concentration is 2mol / L;

[0072] (2) sodium hydroxide is mixed with complexing agent to form alkaline solution B, wherein the concentration of sodium hydroxide is 170g / L, and the concentration of complexing agent is 15g / L;

[0073] (3) Co-precipitation reactor is used, the reaction conditions are controlled to be pH 10.0, the reaction temperature is 50°C, the reaction time is 23h, the stirring rate is 350r / min, the precursor with a particle size of 3-5μm is filtered, and washed to remove After sulfuric acid radicals and other residues were left, they were dried to obtain sample C;

[0074] (4) Mix sample C with lithium carbonate at a molar ratio of 1:1.47, raise the temperature from room temperature to 550 °C at a rate of 10 °C / min, keep the temperature constant for 5 hours, and then increa...

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Abstract

The invention discloses a doped lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The method for preparing the doped lithium-rich manganese-based positive electrode material comprises the following steps: providing a doped lithium-rich manganese-based positive electrode material precursor and lithium salt; mixing the doped lithium-rich manganese-based positive electrode material precursor with a part of the lithium salt, and carrying out first calcination treatment to obtain a positive electrode material precursor; and mixing the positive electrode material precursor with the remaining part of the lithium salt, and carrying out second calcination treatment to obtain the doped lithium-rich manganese-based positive electrode material. According to the method, generation of impure phases in the material can be effectively inhibited through step-by-stepcalcination between the lithium salt and the precursor, so that the performance of the product is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular, the invention relates to a doped lithium-rich manganese-based positive electrode material and a preparation method and application thereof. Background technique [0002] The positive electrode material of single crystal or single crystal grain has better performance than the positive electrode material of its polycrystalline grain, and has been recognized by the industry and scientific research circles. Lithium-rich manganese-based layered cathode materials are considered to be the next generation of high-capacity lithium-ion battery cathode materials. One of the key core technologies in the field. [0003] In the prior art, for the preparation of crystal lithium-rich manganese-based layered positive electrode materials, the process of adding lithium salt once and then high-temperature treatment in two stages is adopted. [0004] Chinese patent CN109537054A discloses a high-magni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00C01G53/00H01M4/505H01M4/525H01M4/62H01M10/052
CPCC01G55/002C01G53/006H01M4/505H01M4/525H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 李冰邓城梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD