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Preparation method of modified monocrystalline ternary cathode material for lithium ion batteries

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of difficult structure modification of secondary spherical particles, degradation of electrochemical performance, and small particle size of primary particles, etc., to achieve excellent Capacity performance and rate performance, improvement of surface stability, and improvement of surface activity

Inactive Publication Date: 2019-06-04
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, there are some problems to be solved urgently in the secondary spherical particles: (1) The secondary spherical structure makes the structure of the material poor. The internal particles are exposed, the side reaction with the electrolyte is intensified, the metal ions are eluted, and the electrochemical performance is reduced; (2) the particle size of the primary particles that make up the secondary ball is small, and there are many structural defects, and the structure is prone to occur under high voltage and sufficient conditions. Collapse; (3) It is difficult to modify the structure inside the secondary spherical particles, and it is difficult to suppress the interface side reactions during charge and discharge; (4) The secondary spherical particles are easy to cause gas inflation and other problems
[0007] In the prior art: CN 103700836A and CN 109273710A respectively disclose a ZnO-coated single crystal 523 type ternary positive electrode material and a N a o b A method for preparing a coated single crystal ternary cathode material, but it is difficult to achieve uniform coating by simple ball milling and mixing, and the cycle performance and rate performance of the prepared single crystal ternary cathode material are not good

Method used

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  • Preparation method of modified monocrystalline ternary cathode material for lithium ion batteries
  • Preparation method of modified monocrystalline ternary cathode material for lithium ion batteries
  • Preparation method of modified monocrystalline ternary cathode material for lithium ion batteries

Examples

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Embodiment 1

[0037] This example is a magnesium oxide coated single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 A method for preparing a ternary cathode material.

[0038] The mass percentage of the magnesium oxide is 1 wt%, and the magnesium oxide is in an amorphous state in a single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 A coating layer is formed on the surface of the ternary positive electrode material, and the positive electrode material is a particle with a particle diameter of 3-8 μm.

[0039] This embodiment includes the following steps:

[0040] (1) Single crystal LiNi coated with 1% MgO by mass fraction 0.8 co 0.1 mn 0.1 o 2 preparation of

[0041] Weigh 10.0000 g single crystal ternary cathode material NCM811 precursor and mix it with 13% excess lithium hydroxide according to the stoichiometric ratio according to the ball material ratio of 1:10. After ball milling at 400 rpm for 2 h, the The mixture was sintered at a temperature of 1000 °C, and then passed through a 400-mesh siev...

Embodiment 2

[0046] This example is a magnesium oxide coated single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 Preparation method of ternary cathode material:

[0047] The mass percentage of the magnesium oxide is 2 wt%, and the magnesium oxide is in an amorphous state in the single crystal LiNi 0.8 co 0.1 mn 0.1 o 2 A coating layer is formed on the surface of the ternary positive electrode material, and the positive electrode material is a particle with a particle diameter of 3-8 μm.

[0048] This embodiment includes the following steps:

[0049] (1) Single crystal LiNi coated with 2% MgO 0.8 co 0.1 mn 0.1 o 2 preparation of

[0050] Weigh 10.0000 g of the single crystal ternary cathode material NCM811 precursor and mix it with 10% excess lithium hydroxide according to the stoichiometric ratio according to the ball-to-material ratio of 1:10. After ball milling at a speed of 300 rpm for 5 h, the The mixture was sintered at a temperature of 900 °C and passed through a 400-mesh sieve to...

Embodiment 3

[0055] This embodiment is lanthanum oxide coated single crystal LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation method of ternary cathode material:

[0056] The mass percent content of the lanthanum oxide is 10 wt%, and the lanthanum oxide is in an amorphous state in a single crystal LiNi 0.6 co 0.2 mn 0.2 o 2 A coating layer is formed on the surface of the ternary positive electrode material, and the positive electrode material is a particle with a particle diameter of 3-8 μm.

[0057] This embodiment includes the following steps:

[0058] (1) Mass fraction 10%La 2 o 3 Coated single crystal LiNi 0.6 co 0.2 mn 0.2 o 2 preparation of

[0059] Weigh 10.0000 g of single crystal ternary cathode material NCM622 precursor and mix it with 9% excess lithium carbonate according to the stoichiometric ratio according to the ball-to-material ratio of 1:20. After ball milling at 100 rpm for 8 h, the The mixture was sintered at a temperature of 800 °C, and then passed through a 200-me...

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Abstract

A preparation method of a modified monocrystalline ternary cathode material for lithium ion batteries comprises the following steps: ball-milling and mixing a monocrystalline ternary cathode materialprecursor and a lithium source, sintering the mixture, crushing the mixture by air flow and sifting the mixture; dispersing the soluble salt of a surface coating material in anhydrous organic solvent,and obtaining homogenized solution after ultrasonic treatment; adding the crushed and sifted monocrystalline ternary cathode material to the solution and carrying out stirring to make the soluble salt adsorbed uniformly onto the surface of the monocrystalline ternary cathode material; removing the liquid and drying the material to obtain a monocrystalline ternary cathode material solid adsorbed with the soluble salt on the surface; and roasting the solid to form a monocrystalline ternary cathode material with an oxygen coating layer on the surface. A battery prepared by using the modified monocrystalline ternary cathode material has better capacity performance and rate performance, and the preparation method of the invention is simple in operation and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a modified single crystal ternary positive electrode material. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, no memory effect, environmental friendliness, and low self-discharge rate, and have broad application prospects. [0003] Layered nickel-cobalt-manganese ternary cathode materials have become a common cathode material for lithium-ion batteries due to their high specific capacity, safety, low toxicity, and low cost. [0004] At present, the materials produced by ternary cathode material manufacturers at home and abroad are mostly secondary particles formed by the agglomeration of fine grains. However, there are some problems to be solved urgently in the secondary spherical particles: (1) The secondary spherical structure makes the structure of the material poor. The internal particles are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 郑俊超刘洋贺振江范鑫铭汤林波
Owner CENT SOUTH UNIV
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