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Lithium battery cathode active material and preparation method and application thereof

A positive active material, lithium battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problem of limited stability improvement of lithium nickel manganate materials, etc., to improve electrochemical performance, improve stability, The effect of excellent cycle performance

Active Publication Date: 2020-05-22
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned metal doping has a limited effect on improving the stability of lithium nickel manganese oxide materials.

Method used

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  • Lithium battery cathode active material and preparation method and application thereof
  • Lithium battery cathode active material and preparation method and application thereof
  • Lithium battery cathode active material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 18g of LiNi 0.5 mn 1.5 o 4 Materials (purchased from Shandong Qixing Energy Materials Co., Ltd.) and 0.267g Li 2 SO 4 Mix evenly, and calcinate the obtained mixture in oxygen at 900°C for 5h, with a heating rate of 3°C / min and a cooling rate of 5°C / min.

[0041] figure 1 The SEM picture of the original lithium nickel manganese oxide material is shown, and it can be seen that the crystal plane of the lithium nickel manganese oxide material is mainly the [100] plane.

[0042] figure 2 The SEM picture of the lithium nickel manganese oxide material prepared in Example 1 is shown. from figure 2 It can be seen that after surface modification by sulfur element, the crystal plane of lithium nickel manganese oxide material changes from [100] to [111] plane.

Embodiment 2

[0044] 18g of LiNi 0.4 mn 1.6 o 4 Materials (purchased from Shandong Qixing Energy Materials Co., Ltd.), 0.54g of ammonium sulfate and 1g of citric acid were uniformly mixed, and the resulting mixture was calcined in oxygen at 800°C for 6h, with a heating rate of 3°C / min and a cooling rate of 5°C / min .

[0045] image 3 Shows the LiNi after the surface sulfur element modification that embodiment 2 makes 0.4 mn 1.6 o 4 Using XPS to characterize the relative content of sulfur on the surface at different etching depths, we can see that the content of sulfur decreases from the surface to the interior as the etching depth increases.

[0046] Next, the positive electrode active material of the lithium battery prepared in Example 1 was assembled into a button battery according to the following steps.

[0047] (1) Preparation of positive pole piece

[0048] The lithium battery cathode active material prepared in Example 1, carbon black as a conductive additive and polyvinylide...

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Abstract

The invention discloses a lithium battery cathode active material and a preparation method and application thereof. The lithium ion battery cathode material comprises lithium-containing compound particles with the chemical formula of Li1+xNi0.5-yMn1.5-zOu, x is larger than or equal to -0.2 and smaller than or equal to 0.2, y is larger than or equal to -0.2 and smaller than or equal to 0.2, z is larger than or equal to -0.2 and smaller than or equal to 0.2, and u is larger than or equal to 3.8 and smaller than or equal to 4.2. The surface of the lithium battery cathode active material providedby the invention is doped with the sulfur element in a gradient manner, so that the stability of the cathode material is effectively improved, and the preparation method has the following advantages:1) the simple and feasible process and low cost; 2) the morphology and crystal face distribution of the generated lithium nickel manganese oxide material can be regulated and controlled; and 3) the comprehensive performance of the spinel cathode active material can be improved, the development prospect is excellent, and the prepared lithium ion secondary battery can be used as an energy source applied to electric tools, electric bicycles, hybrid electric vehicles, pure electric vehicles and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a lithium battery cathode active material and a preparation method and application thereof. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage, light weight, small size, no memory effect, low self-discharge rate, long cycle life, and high energy density. Mobile terminal products such as mobile phones, laptops, and tablets. In recent years, due to environmental protection considerations, electric vehicles have been rapidly developed under the impetus of governments and automobile manufacturers, and lithium-ion secondary batteries have become an ideal power source for new-generation electric vehicles due to their excellent performance . [0003] At present, the positive electrode materials of lithium-ion secondary batteries that people pay att...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/38H01M4/131H01M10/0525
CPCH01M4/131H01M4/362H01M4/38H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 武怿达黄学杰詹元杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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