Nickel/cobalt-rich high-entropy ceramic positive electrode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of improving performance and uniform distribution of elements

Active Publication Date: 2021-02-05
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, there are few studies on it in lithium-ion battery materials, especially in the field o

Method used

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  • Nickel/cobalt-rich high-entropy ceramic positive electrode material for lithium ion battery and preparation method thereof
  • Nickel/cobalt-rich high-entropy ceramic positive electrode material for lithium ion battery and preparation method thereof
  • Nickel/cobalt-rich high-entropy ceramic positive electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Configure nickel sulfate, cobalt sulfate, manganese sulfate, zinc sulfate, magnesium sulfate, and sodium aluminate into an aqueous solution according to the ratio of substances 12:4:1:1:1:1, wherein nickel sulfate, cobalt sulfate, manganese sulfate, sulfuric acid Zinc and magnesium sulfate are mixed together, the total metal salt concentration is 1.5M, sodium aluminate is prepared separately, the concentration is about 0.1M, the amount of ammonia water is 0.2 times that of metal ions (including sodium aluminate), sodium hydroxide The concentration is 3M. Control the reaction temperature at 58°C, add the solution dropwise under stirring, and pass nitrogen gas to prevent oxidation, keep the pH of the solution at about 10.8, obtain a precipitate, wash the precipitate with deionized water continuously, and then dry it at 100°C , to obtain the precursor of the cathode material.

[0029] Mix the precursor and lithium carbonate uniformly in proportion, the mixing ratio is 1.0...

Embodiment 2

[0031] Nickel sulfate, cobalt sulfate, manganese sulfate, magnesium sulfate, and sodium aluminate are configured into an aqueous solution according to the mass ratio of 9:3:1:1:1, wherein nickel sulfate, cobalt sulfate, manganese sulfate, and magnesium sulfate are mixed together, The total metal salt concentration is 1.5M, sodium aluminate is prepared separately, the concentration is about 0.1M, the amount of ammonia water is 0.2 times that of metal ions (containing sodium aluminate), and the concentration of sodium hydroxide is 3M. Control the reaction temperature at 58°C, add the solution dropwise under stirring, and pass nitrogen gas to prevent oxidation, keep the pH of the solution at about 10.8, obtain a precipitate, wash the precipitate with deionized water continuously, and then dry it at 100°C , to obtain the precursor of the cathode material.

[0032] Mix the precursor and lithium carbonate uniformly in proportion, the mixing ratio is 1.05:1 between lithium and other ...

Embodiment 3

[0034] Configure nickel sulfate, cobalt sulfate, manganese sulfate, zinc sulfate, magnesium sulfate, and sodium aluminate into an aqueous solution according to the ratio of substances 32:4:1:1:1:1, and mix with lithium carbonate at a temperature of 780°C. The conditions are the same as in Example 2, and the temperature is lowered to obtain the high-entropy oxide ceramic cathode material LiNi 0.8 co0.1 mn 0.025 Mg 0.025 Al 0.025 Zn 0.025 o 2 . According to the 0.2C test, the discharge capacity of the electrode material is 183mAh g -1 .

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Abstract

The invention belongs to the field of new energy materials, and particularly relates to a nickel/cobalt-rich high-entropy ceramic positive electrode material for a lithium ion battery and a preparation method thereof. The chemical formula of the nickel-cobalt-rich high-entropy ceramic positive electrode material is LiNixCoyA(1-x-y)/nB(1-x-y)/nC(1-x-y)/nD(1-x-y)/n...O2, wherein 0.4 < = x < = 0.8 and 0.1 < = y < = 0.3, and the proportion is the ratio of the amount of substance; the A, B, C and D are selected from Mn, Zn, Mg and Al, and the n is 3 or 4. A preparation method comprises the following steps: (1) preparing a metal salt aqueous solution in proportion, adding the metal salt aqueous solution, a complexing agent and alkali into a reaction container in a certain proportion, controllingthe pH value to be constant to obtain a precipitate, and washing the precipitate to obtain a product precursor; (2) mixing and roasting the precursor and a lithium salt to finally obtain a positive electrode material. The nickel/cobalt-rich high-entropy system can effectively improve the performance of the positive electrode material.

Description

technical field [0001] This patent belongs to the field of new energy materials, and specifically relates to a nickel-cobalt-rich high-entropy ceramic cathode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Since the 21st century, with the continuous development of new energy technologies, lithium-ion batteries have been widely used in consumer electronics, new energy vehicles and other fields. Lithium-ion battery cathode material is an important part of lithium-ion batteries and also affects its performance. At this stage, lithium-ion battery cathode materials are mainly lithium iron phosphate cathode, ternary layered cathode, etc., but these material systems are close to maturity, and the development potential is already small, so the development of a new lithium-ion battery cathode material system is important for improving The performance of lithium-ion batteries is of great significance. [0003] As a new type of comp...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 田然裴晓东骆艳华鲍维东李晓祥
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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