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Doped high-voltage positive electrode material and preparation methods thereof

A positive electrode material, high voltage technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of positive electrode material capacity loss, limited battery performance improvement, complex sintering process, etc., to achieve improved capacity retention, excellent cycle stability, Effect of reducing oxygen deficiency

Active Publication Date: 2021-01-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, the positive electrode material is doped with elements during the preparation process, and then coated. The sintering process is more complicated, which consumes a lot of energy, and because the coating layer is an inactive material, it is easy to cause the loss of the capacity of the positive electrode material.
Existing modification methods often cannot meet the requirements of positive electrode materials with excellent cycle stability under high voltage, and have limited improvement in battery performance.

Method used

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  • Doped high-voltage positive electrode material and preparation methods thereof
  • Doped high-voltage positive electrode material and preparation methods thereof
  • Doped high-voltage positive electrode material and preparation methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The preparation method of the doped high-voltage lithium cobalt oxide positive electrode material provided in the first embodiment includes the following steps:

[0050] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0051] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0052] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.005:0.0005:0.005, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate at...

Embodiment 2

[0055] The preparation method of the doped high-voltage lithium cobalt oxide positive electrode material provided in the second embodiment includes the following steps:

[0056] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0057] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0058] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.002:0.0005:0.005, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate a...

Embodiment 3

[0060] The preparation method of the doped high-voltage lithium cobalt oxide positive electrode material provided in the third embodiment includes the following steps:

[0061] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0062] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0063] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.01:0.01:0.01, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate at a c...

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Abstract

The invention provides a doped high-voltage positive electrode material and a preparation method thereof, and specifically includes a doped high-voltage lithium cobalt oxide and a high-nickel ternarypositive electrode material and preparation methods thereof. The chemical general formula of the doped high-voltage lithium cobalt oxide is LiaCoMbO2, in the formula, a is greater than or equal to 0.9and smaller than or equal to 1.2, b is greater than 0.000001 and less than 0.5, and M is one of Y, Tb and Pr, or two or more of Zn, Y, Tb and Pr. The doped high-voltage high-nickel ternary positive electrode material is characterized in that: the chemical general formula is Lia[Ni1-x-yCoxMny]MbO2, in the formula, a is greater than or equal to 0.9 and smaller than or equal to 1.2, x is greater than 0 and less than or equal to 1, y is greater than 0 and less than or equal to 1, x+y is greater than 0 and less than or equal to 1, b is is greater than 0.00001 and less than 0.5, and M is one or twoof Tb and Pr.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a doped high-voltage positive electrode material and a preparation method thereof. [0002] technical background [0003] With the increasing demand for lithium-ion batteries in the consumer electronics energy storage market and electric vehicles, the market has put forward higher requirements for the specific capacity, cycle stability and safety performance of lithium-ion battery cathode materials, that is, the development has higher Potential and higher energy density, while having good cycle performance and rate performance of the positive electrode material. [0004] Lithium-ion battery cathode materials, such as lithium cobaltate and high-nickel ternary materials (LiNi x co y mn (1-x-y) o 2 , x>0.5), increasing its charge cut-off voltage can improve the discharge specific capacity and energy density of the material. However, at high v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 袁良杰王瑞滋李腾童志强
Owner WUHAN UNIV
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