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Cobalt composite hydroxide and preparation method thereof, lithium ion battery positive electrode material and lithium ion battery

A composite hydroxide and chemical formula technology, which is applied in the field of cobalt composite hydroxide and its preparation, and lithium-ion battery cathode materials, can solve the problems of rapid charge-discharge cycle capacity decay, low specific capacity of lithium cobalt oxide materials, and dissolution of cathode materials, etc. problems, to achieve the effect of improving specific capacity and cycle capacity retention, excellent cycle performance, and improving rate performance

Pending Publication Date: 2022-05-13
CNGR ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium cobalt oxide materials have disadvantages such as low specific capacity, poor safety and high cost.
[0004] In addition, side reactions at the battery-electrolyte interface will occur in the cathode material during the long cycle, which will lead to many problems such as dissolution of the cathode material, increase in the internal resistance of the battery, poor thermal safety, and rapid charge-discharge cycle capacity decay.

Method used

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  • Cobalt composite hydroxide and preparation method thereof, lithium ion battery positive electrode material and lithium ion battery
  • Cobalt composite hydroxide and preparation method thereof, lithium ion battery positive electrode material and lithium ion battery
  • Cobalt composite hydroxide and preparation method thereof, lithium ion battery positive electrode material and lithium ion battery

Examples

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Effect test

Embodiment 1

[0105] The cobalt composite hydroxide Ni provided by the present embodiment 0.05 co 0.9 mn 0.05 (OH) 2 The preparation method comprises the steps (reaction process is carried out under nitrogen atmosphere):

[0106] (1) Dissolve nickel chloride, cobalt chloride, and manganese chloride in water, and mix them uniformly to obtain a mixed metal salt solution; wherein, the molar ratio of nickel, cobalt, and manganese is 5:90:5, and the mixed metal salt The molar concentration of metal ions in the solution is 2mol / L;

[0107] And preparation massfraction is that the sodium hydroxide solution of 32% is as precipitant solution, and preparation massfraction is the ammoniacal liquor of 21% as complexing agent; Above-mentioned 32% sodium hydroxide solution and massfraction are mixed with the ammoniacal liquor of 21%, and Add water to prepare a bottom solution with a pH of 11.5 and an ammonia concentration of 8.0 g / L;

[0108] (2) Selecting a reactor with a volume of 100L, under a ni...

Embodiment 2

[0111] The cobalt composite hydroxide Ni provided by the present embodiment 0.05 co 0.9 mn 0.05 (OH) 2 The preparation method of the method is basically the same as that of Example 1, the only difference is that in step (2), the feed flow ratio of the mixed metal salt solution, the precipitant solution and the complexing agent is replaced by 1:0.4:0.06.

Embodiment 3

[0113] The cobalt composite hydroxide Ni provided by the present embodiment 0.1 co 0.9 (OH) 2 The preparation method comprises the steps (reaction process is carried out under nitrogen atmosphere):

[0114] (1) Nickel sulfate and cobalt sulfate are dissolved in water, after mixing uniformly, obtain mixed metal salt solution; Wherein, the mol ratio of nickel element and cobalt element is 10:90, and the molar concentration of the metal ion in mixed metal salt solution is 2mol / L;

[0115] And preparation massfraction is that the sodium hydroxide solution of 32% is as precipitant solution, and preparation massfraction is the ammoniacal liquor of 21% as complexing agent; Above-mentioned 32% sodium hydroxide solution and massfraction are mixed with the ammoniacal liquor of 21%, and Add water to prepare a bottom solution with a pH of 11.5 and an ammonia concentration of 8.0 g / L;

[0116] (2) is exactly the same as the step (2) of embodiment 1;

[0117] (3) is exactly the same as...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to cobalt composite hydroxide and a preparation method thereof, a lithium ion battery positive electrode material and a lithium ion battery. The chemical formula of the cobalt composite hydroxide is Ni < x > Co < y > Mn < z > (OH) < 2 >, x + y + z = 1, x is smaller than or equal to 0.1, y is larger than or equal to 0.9, z is smaller than or equal to 0.1, and x and z are not 0 at the same time; the ratio of the 100 active crystal face in the cobalt composite hydroxide is 10%-40%. By doping Ni and / or Mn, the structural stability of the cobalt composite hydroxide can be effectively improved, the specific capacity and the cycle capacity retention ratio of the battery are improved, and the cost is reduced; by exposing the 100 active crystal face in a large area and covering the 001 inactive face, the rate capability of the positive electrode material obtained after sintering can be improved, the contact area between the positive electrode material and an electrolyte is reduced, side reaction of a positive electrode material-electrolyte interface is reduced, and excellent cycle performance is obtained.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a cobalt composite hydroxide and a preparation method thereof, a lithium ion battery cathode material and a lithium ion battery. Background technique [0002] Lithium cobaltate is an inorganic compound with the chemical formula LiCoO 2 , generally used as a positive electrode material for lithium-ion batteries, and its appearance is gray-black powder. Some key indicators such as energy density, charge-discharge rate, and safety of lithium-ion batteries are mainly restricted by the cathode material. [0003] At present, lithium cobalt oxide cathode material is a relatively mature cathode material, which is widely used in 3C (abbreviation for computer, communication and consumer electronics) digital fields because of its high energy density and stable discharge voltage. However, lithium cobalt oxide materials have disadvantages such as low specific capacity, poor safety and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G51/00H01M4/525H01M4/505H01M10/0525
CPCC01G53/00C01G53/006C01G51/00C01G53/50C01G53/42C01G51/50H01M4/525H01M4/505H01M10/0525C01P2004/61C01P2004/45C01P2004/51C01P2006/40H01M2004/028
Inventor 何乐王灯訚硕翁毅周正周明涛胡骏康
Owner CNGR ADVANCED MATERIAL CO LTD