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Modification method for realizing doping and coating of a high-nickel ternary positive electrode material by using pretreatment precursor

A technology of cathode materials and precursors, applied in the field of pretreatment of precursors to realize the modification of doped and coated high-nickel ternary cathode materials

Pending Publication Date: 2020-12-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method to improve the precursor stage, replace the oxygen calcination atmosphere, and realize the modification of doping and coating to make the high-nickel ternary cathode material have more excellent structural characteristics and electrochemical performance.

Method used

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  • Modification method for realizing doping and coating of a high-nickel ternary positive electrode material by using pretreatment precursor
  • Modification method for realizing doping and coating of a high-nickel ternary positive electrode material by using pretreatment precursor
  • Modification method for realizing doping and coating of a high-nickel ternary positive electrode material by using pretreatment precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. A method for modifying a pretreated precursor to achieve doping and coating a high-nickel ternary positive electrode material, the method steps are as follows:

[0040] (1) Weigh 1g of the precursor and disperse it in 100mL of deionized water to obtain the precursor solution;

[0041] (2) Take 0.005g potassium permanganate and dissolve it in 10mL deionized water to obtain potassium permanganate solution;

[0042] (3) Add 7.5mL potassium permanganate solution to the precursor solution, continue stirring for 1h, then add the remaining 2.5mL potassium permanganate solution, continue stirring for 0.5h, the speed is 500rmp / min, and the temperature is 30°C ;

[0043] (4) After the reaction is completed, filter with deionized water for 5 times, and move the obtained pretreated precursor to a vacuum drying oven at 120°C for 12 hours;

[0044] (5) Combine the dried and pretreated precursor with LiOH·H 2 O was mixed and ground at a molar ratio of 1:1.05, kept at 48...

Embodiment 2

[0046] Example 2. A method for modifying a pretreated precursor to achieve doping and coating a high-nickel ternary positive electrode material, the method steps are as follows:

[0047] (1) Weigh 1g of the precursor and disperse it in 100mL of deionized water to obtain the precursor solution;

[0048] (2) Weigh 0.01g potassium permanganate and dissolve it in 10mL deionized water to obtain potassium permanganate solution;

[0049] (3) Add 7.5mL potassium permanganate solution to the precursor solution, continue stirring for 1 hour, then add the remaining 2.5mL potassium permanganate solution, continue stirring for 1 hour, the rotation speed is 500rmp / min, and the temperature is 30°C;

[0050] (4) After the reaction is completed, filter with deionized water for 5 times, and move the obtained pretreated precursor to a vacuum drying oven at 120°C for 12 hours;

[0051] (5) Combine the dried and pretreated precursor with LiOH·H 2 O was mixed and ground at a molar ratio of 1:1.0...

Embodiment 3

[0053] Example 3. A method for modifying a pretreated precursor to achieve doping and coating a high-nickel ternary positive electrode material, the method steps are as follows:

[0054] (1) Weigh 1g of the precursor and disperse it in 100mL of deionized water to obtain the precursor solution;

[0055] (2) Weigh 0.015g potassium permanganate and dissolve it in 10mL deionized water to obtain potassium permanganate solution;

[0056] (3) Add 7.5mL potassium permanganate solution to the precursor solution, continue stirring for 1.5h, then add the remaining 2.5mL potassium permanganate solution, continue stirring for 0.5h, the speed is 500rmp / min, the temperature is 30 ℃;

[0057] (4) After the reaction is completed, filter with deionized water for 5 times, and move the obtained pretreated precursor to a vacuum drying oven at 120°C for 12 hours;

[0058] (5) Combine the dried and pretreated precursor with LiOH·H 2 O was mixed and ground at a molar ratio of 1:1.05, kept at 480°...

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Abstract

The invention discloses a modification method for realizing doping and coating of a high-nickel ternary positive electrode material by using a pretreatment precursor. The modification method comprisesthe following steps of: (1) dispersing a high-nickel ternary precursor into deionized water to obtain a precursor solution; (2) dissolving potassium permanganate in deionized water to obtain a potassium permanganate solution; (3) adding the potassium permanganate solution into the precursor solution, stirring the mixed solution, carrying out suction filtration, and carrying out vacuum drying on the mixed solution to obtain a potassium permanganate pretreatment precursor; and (4) grinding and uniformly mixing the potassium permanganate pretreatment precursor and LiOH.H2O, and calcining the mixture in air to obtain a high-nickel ternary positive electrode modified material. According to the modification method, the potassium permanganate is used as a strong oxidant and a pretreatment precursor, so that the preparation conditions of the product are simplified, the current oxygen atmosphere is replaced, MnO2 coating and Mn <4+> doping can be realized through high-temperature calcination in the air atmosphere, and the prepared product has the advantages of good structural stability, good cycle performance, high rate capability, capability of inhibiting surface side reaction, good electrochemical performance and the like.

Description

technical field [0001] The present invention relates to the technical field of cathode materials for lithium-ion batteries, in particular to a modification method for pretreating precursors to achieve doping and coating high-nickel ternary cathode materials. Background technique [0002] As an excellent energy storage device, lithium-ion batteries are widely used in electric vehicles, hybrid vehicles, uninterruptible power supplies, etc. As a key component of lithium-ion batteries, cathode materials play a key role in determining the energy density and cost (accounting for about 35%) of lithium-ion batteries. Among different cathode materials, nickel-rich ternary cathode materials are considered to be one of the most promising materials for the next generation due to their high discharge capacity, low price, and environmental friendliness. However, there are also some problems with high-nickel ternary cathode materials, such as surface side reactions with the electrolyte, s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 吴复忠张剑东戴新义金会心麦毅
Owner GUIZHOU UNIV
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