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Positive electrode material and preparation method thereof, positive electrode plate, battery cell and battery

A technology of positive electrode materials and positive electrode sheets, which is applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor withstand voltage performance and affect battery cycle stability, so as to improve the withstand voltage performance, improve the withstand voltage performance and The effects of cycle stability and good withstand voltage performance

Active Publication Date: 2020-06-30
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium cobalt oxide has poor voltage resistance at higher charging voltages, which affects the cycle stability of the battery.

Method used

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  • Positive electrode material and preparation method thereof, positive electrode plate, battery cell and battery
  • Positive electrode material and preparation method thereof, positive electrode plate, battery cell and battery
  • Positive electrode material and preparation method thereof, positive electrode plate, battery cell and battery

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preparation example Construction

[0071] image 3 Shown is a flowchart of a method for preparing a positive electrode material according to an exemplary embodiment of the present disclosure. Some embodiments of the present disclosure also provide a method for preparing a positive electrode material, which is used to prepare any of the above-mentioned positive electrode materials, refer to image 3 , the preparation method comprises:

[0072] Step 31, coating the surface of the first lithium cobaltate particles with a first withstand voltage protection layer.

[0073] In some embodiments, step 31 includes:

[0074] Mixing the first lithium cobaltate particles and the first withstand voltage protecting agent, so that the first withstand voltage protecting agent is coated on the surface of the first lithium cobaltate particles, and then performing the first sintering treatment, the first crushing treatment and the second A separation treatment, the first voltage-resistant protection agent forms a first voltage...

Embodiment 1

[0105] This embodiment provides a positive electrode material, including first active particles and second active particles. The first active particle is doped with magnesium oxide with a mass fraction of 2000ppm, and the first active particle is sequentially covered with an aluminum oxide layer with a mass fraction of 800ppm and a titanium oxide layer with a mass fraction of 1000ppm from the inside to the outside. The second active particle is doped with magnesium oxide with a mass fraction of 2500ppm, and the second active particle is coated with a titanium oxide layer with a mass fraction of 600ppm and an aluminum oxide layer with a mass fraction of 1200ppm sequentially from the inside to the outside.

Embodiment 2

[0107] This embodiment provides a positive electrode material, including first active particles and second active particles. The first active particle is doped with magnesium oxide with a mass fraction of 2000ppm, and the first active particle is sequentially covered with an aluminum oxide layer with a mass fraction of 800ppm and a titanium oxide layer with a mass fraction of 1000ppm from the inside to the outside. The second active particle is doped with magnesium oxide with a mass fraction of 3000 ppm, and the second active particle is coated with a titanium oxide layer with a mass fraction of 400 ppm and an aluminum oxide layer with a mass fraction of 1500 ppm from the inside to the outside.

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Abstract

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a battery cell and a battery. The positive electrode material is used for the batteryand comprises first active particles and second active particles in a mass ratio of 1: 1-4: 1. The first active particles comprise first lithium cobalt oxide particles, a first voltage-resistant protective layer coating surfaces of the first lithium cobalt oxide particles, and a first fast ion conduction layer coating a surface of the first voltage-resistant protective layer. The second active particles comprise second lithium cobalt oxide particles, a second fast ion conduction layer coating surfaces of the second lithium cobalt oxide particles, and a second voltage-withstanding protection layer coating a surface of the second fast ion conduction layer. The particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles. The battery prepared from the positive electrode material has good voltage resistance and cycling stability.

Description

technical field [0001] The present disclosure relates to the technical field of batteries, in particular to a positive electrode material and a preparation method thereof, a positive electrode sheet, a battery cell and a battery. Background technique [0002] With the rapid development of electronic devices such as mobile phones, tablet computers and smart bracelets, users have higher and higher requirements for the endurance and fast charging capabilities of electronic devices, which requires batteries with excellent voltage resistance and cycle stability. At present, lithium-ion batteries are widely used in electronic devices. The positive electrode materials of lithium-ion batteries include lithium cobalt oxide (LiCoO 2 ), through lithium cobalt oxide to deintercalate lithium ions or intercalate lithium ions, so that the lithium ion battery can be charged and discharged. However, lithium cobalt oxide has poor withstand voltage performance at a higher charging voltage, wh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/362H01M4/525H01M4/62H01M4/628H01M10/0525H01M2220/30Y02E60/10
Inventor 杜思红
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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