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Positive plate and preparation method and application thereof

A technology for a positive electrode sheet and a positive electrode active material, which is applied in the field of positive electrode sheet and its preparation, can solve the problems of affecting the electrochemical performance of a battery, reducing the high hygroscopicity positive electrode sheet, etc., and achieves the effects of improving storage performance, reducing harmful effects and shortening time.

Inactive Publication Date: 2021-03-09
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention provides a positive electrode sheet and its preparation method and application. The positive electrode sheet can solve the problem that the existing highly water-absorbing positive electrode sheet reacts with trace moisture and carbon dioxide in the air to affect the electrochemical performance of the final battery. The method is to use Low-temperature atomic deposition technology reduces the high dependence of the highly hygroscopic positive electrode on the ambient humidity, which can improve the storage performance of the highly water-absorbing positive electrode and reduce the harmful effects of moisture and carbon dioxide in the air on the positive electrode

Method used

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  • Positive plate and preparation method and application thereof

Examples

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Embodiment 1

[0084] Lini 0.83 CO 0.12 Mn 0.05 O 2 As the positive electrode active material, it is prepared from the mass ratio of 97% by: 2% by: 1% by mass of 97%: 2%: 1%. It has been coated, baked, and is molded into a slice of 45 × 90 mm with the ear, wherein the paste is a double-sided 45 × 70 mm, and the empty foil is double-sided 45 × 20 mm.

[0085] The empty foil portion (20 mM) and the paste portion (3 mm) of the positive electrode sheet are clamped by the clamp, and the multi-set positive electrode sheet is vertically suspended in the reaction chamber of the atomic layer deposition apparatus pre-filled with dry air, and each positive electrode sheet is Interval> 1 mm, the reaction chamber also contains a plasma generating device and can be spaced apart from the above-mentioned reaction chamber, and can communicate through the valve via the cavity and the reaction chamber if necessary. When the positive electrode is removed, the vacuum is removed to 1-2 Pa, and the reaction chamber te...

Embodiment 2

[0092] Unlike Example 1 Different points lies in:

[0093] The positive electrode active material in the positive electrode sheet used is LINI 0.88 CO 0.09 Mn 0.03 O 2 Get a thickness ≤2nm Al 2 O 3 The positive electrode sheet of the coating layer.

Embodiment 3

[0095] Unlike Example 1 Different points lies in:

[0096] The positive electrode active material in the positive electrode sheet used is LINI 0.7 CO 0.1 Mn 0.2 O 2 Get a thickness ≤2nm Al 2 O 3 The positive electrode sheet of the coating layer.

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Abstract

The invention provides a positive plate as well as a preparation method and application thereof. The method comprises the following four steps of (1) introducing a first coating material source, and carrying out physical adsorption on pores and the surface of a positive plate; (2) introducing gas which does not react with the first coating material source for cleaning, and removing byproducts andredundant first coating material source; (3) introducing a second coating material source to react with the adsorbed first coating material source on the pores and the surface of the positive plate togenerate a film type coating layer; and (4) introducing inert gas for cleaning. The positive plate can overcome the defect that the electrochemical performance of the final battery is influenced by the reaction of the existing high-water-absorption positive plate with trace moisture and carbon dioxide in air, the storage performance of the high-water-absorption positive plate can be improved by the method, and the harmful influence of the moisture and carbon dioxide in the air on the positive plate is reduced; according to the method, high dependence of the high-hygroscopicity positive plateon the environment humidity is reduced by utilizing a low-temperature atomic deposition technology.

Description

Technical field [0001] The present invention belongs to the technical field of battery, and more particularly to a positive electrode sheet and a preparation method thereof. Background technique [0002] Currently commercial lithium-ion batteries are mainly divided into two categories: 3C digital classes and power classes, of which 3C digital lithium-ion batteries have unprecedented approach 800Wh / L, high voltage single crystal Licoo 2 The compact density can reach 4.2g / cm 2 And the mainstream market, but Liicoo 2 The capacity is less than 180mAh / g under voltage of 4.45 V, and the uncomfortable in safety and resistance is different, and CO belongs to rare resources, the price is expensive, and the metal cobalt is easily contaminated. LINIO 2 With the capacity of more than 200mAh / g, the thermal stability is poor, but it is easy to cause safety problems, and it is necessary to synthesize in an oxygen atmosphere, and it is prone to cationic mixing and a compound that generat...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525H01M4/485H01M2004/028Y02E60/10
Inventor 伍鹏曾家江李素丽
Owner ZHUHAI COSMX BATTERY CO LTD