High-nickel cobalt-free lithium ion battery material and preparation method thereof

A lithium-ion battery, high-nickel technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low stability, and achieve the effects of improving stability, improving charging and discharging stability, and inhibiting the dissolution of manganese

Pending Publication Date: 2022-07-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a high-nickel cobalt-free lithium-ion battery material and a preparation method thereof. The present invention solves the problem of low stability of the lithium-ion battery material on the basis of no cobalt doping

Method used

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  • High-nickel cobalt-free lithium ion battery material and preparation method thereof
  • High-nickel cobalt-free lithium ion battery material and preparation method thereof
  • High-nickel cobalt-free lithium ion battery material and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing a high-nickel cobalt-free lithium-ion battery material, comprising the following steps:

[0037] 1) adding lithium source, nickel source, R source, zirconium source, manganese source and citric acid to water to obtain a first solution;

[0038] 2) adding ethanol solution to the first solution to obtain a second solution, stirring to obtain a gel;

[0039] 3) drying the gel obtained in step 2) and then calcining to obtain a high-nickel cobalt-free lithium ion battery material.

[0040] In the present invention, the lithium source is one or more of lithium nitrate, lithium acetate, lithium carbonate, lithium formate and lithium citrate;

[0041] Described nickel source is one or both in nickel nitrate and nickel acetate;

[0042] The R source is one or more of aluminum nitrate, aluminum acetate, aluminum oxalate, rare earth metal nitrate and rare earth metal acetate;

[0043] The zirconium source is one or both...

Embodiment 1

[0054] Weigh 0.2mol lithium nitrate, 0.1mol nickel nitrate, 0.05mol aluminum nitrate, 0.02mol zirconium phosphate, 0.03mol manganese nitrate, add them to 1L deionized water, then add 0.50mol citric acid, stir evenly, and then add mass fraction It was 48ml of 60% ethanol solution, stirred at 75°C for 2h to obtain gel;

[0055] The obtained gel was dried at 160 °C for 2 h, and then calcined at high temperature at 780 °C for 1.5 h to prepare Li(Ni 0.5 Al 0.25 Zr 0.1 Mn 0.15 )O 2 Lithium-ion battery material, denoted as LN 0.5 A 0.25 Z 0.1 M 0.15 O 2 .

[0056] LN prepared in this example 0.5 A 0.25 Z 0.1 M 0.15 O 2 SEM images of lithium-ion battery materials such as figure 1 shown, LN 0.5 A 0.25 Z 0.1 M 0.15 O 2 Lithium-ion battery materials and LiMn 2 O 4 The XRD pattern of the battery material is as figure 2 As shown, it can be seen that the LN prepared by the present invention 0.5 A 0.25 Z 0.1 M 0.15 O 2 Lithium-ion battery materials and LiMn 2 O 4...

Embodiment 2

[0059] Weigh 0.2mol lithium nitrate, 0.1mol nickel nitrate, 0.02mol lanthanum nitrate, 0.02mol zirconium hydroxide, 0.06mol manganese nitrate, add them to 1L deionized water, then add 0.60mol citric acid, stir evenly, and then add mass The fraction is 112ml of 50% ethanol solution, stirred at 75°C for 2h to obtain gel;

[0060] The obtained gel was dried at 180 °C for 2 h, and then calcined at high temperature at 620 °C for 2 h to prepare Li(Ni 0.5 La 0.1 Zr 0.1 Mn 0.3 )O 2 Lithium-ion battery material, denoted as LN 0.5 L 0.1 Z 0.1 M 0.3 O 2 .

[0061] Using the same battery assembly method as in Example 1, the battery prepared in this example was tested to have a specific capacity of 176mAh / g for the first discharge at 60°C and 1C. After 100 cyclic voltammetry tests, the retention rate was 93%.

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses a high-nickel cobalt-free lithium ion battery material and a preparation method thereof. The preparation method comprises the following steps: preparing gel from a lithium source, a nickel source, an R source, a zirconium source and a manganese source through a gel method, and then drying and calcining the gel to prepare the high-nickel cobalt-free lithium ion battery material. According to the high-nickel cobalt-free lithium ion battery material, the aluminum element and/or the rare earth metal element are doped and play a synergistic modification role with the zirconium element, so that the stability of a battery prepared from the high-nickel cobalt-free lithium ion battery material is improved, and meanwhile, the high chemical activity of the battery is also guaranteed.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a high nickel and cobalt-free lithium ion battery material and a preparation method thereof. Background technique [0002] At present, there are many nickel-cobalt-manganese ternary system batteries on the market. The high specific capacity and thermal stability are the major advantages of the battery. Lithium oxide is a kind of cathode material with high safety obtained by improving on the basis of lithium cobalt oxide. [0003] In the positive electrode material of ternary system battery, by adjusting the ratio of nickel, cobalt and manganese elements, a battery positive electrode material with high electrochemical activity and good stability can be obtained, which can be used to replace lithium cobalt oxide positive electrode Material. However, in the ternary cathode material, cobalt still needs to be doped to prevent the destruction of the crystal stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525
Inventor 吴佳霓李军白哲何洁龙张正裕黄新萍
Owner GUANGDONG UNIV OF TECH
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