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A modified positive electrode material and its preparation method and application

A positive electrode material and modification technology, applied in the field of modified positive electrode materials and its preparation, can solve problems such as unfavorable material application, uneven surface coverage, and reduced material capacity, and achieve improved cycle performance and high-temperature storage capacity retention rate, surface Improvement of stability and storage stability and easy availability of raw materials

Active Publication Date: 2022-05-27
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating process is prone to the problem of uneven surface coverage. If the coating amount is increased, the capacity of the material will decrease, which is not conducive to the practical application of the material.

Method used

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  • A modified positive electrode material and its preparation method and application
  • A modified positive electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The positive electrode material used in this example is LiNi 0.6 Co 0.2 Mn 0.2 O 2 ;

[0051] The preparation method of the modified cathode material:

[0052] (1) uniformly mixing modifier and high-nickel positive electrode material in high-mixer, obtain mixture, described modifier is lithium citrate, and the mass ratio of described modifier and high-nickel positive electrode material is 5: 95;

[0053] (2) The mixture obtained in step (1) is heat-treated at 250° C. for 5h in an air atmosphere, and the flow rate of the oxygen atmosphere is 0.4m 3 / h / kg, followed by cooling to obtain the modified cathode material.

Embodiment 2

[0055] The difference between this example and Example 1 is that lithium citrate is replaced with lithium acetate of equal quality, and other conditions are exactly the same as those in Example 1.

Embodiment 3

[0057] The difference between this example and Example 1 is that lithium citrate is replaced with lithium oxalate of the same quality, and other conditions are exactly the same as those in Example 1.

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Abstract

The invention relates to a modified positive electrode material and its preparation method and use. The method comprises using a mixture of organic acid lithium salt and / or inorganic acid lithium salt and an organic reducing agent as a modifier, and combining it with a high nickel positive electrode material Mix, obtain modified positive electrode material through heat treatment afterwards, the method of the present invention can obviously improve the Ni on the surface of modified positive electrode material 2+ and Mn 4+ content, the surface of the obtained modified positive electrode material has higher stability, and the cycle performance and high-temperature storage capacity retention rate of the lithium-ion battery prepared therefrom are significantly improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a modified positive electrode material and a preparation method and application thereof. Background technique [0002] Due to the properties of high energy density, high voltage and environmental friendliness, lithium-ion batteries are widely used in portable power devices (such as mobile phones, computers) and electric vehicles. However, due to the influence of battery materials, conductive additives, and binders, it is currently difficult to prepare lithium-ion batteries with high reversible capacity, high cycle stability, and high rate performance. [0003] Compared with traditional ternary cathode materials, high nickel ternary cathode materials have higher energy density and lower raw material cost, which are the key factors to realize high specific energy lithium-ion secondary batteries. However, the increase of nickel content in the material has brought many s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/364H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 姚毅钟志勇赵会文张业琼江柯成
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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