A kind of negative electrode active material and its preparation method and application

A negative electrode active material, graphite intercalation technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problems of increasing the polarization of the graphite anode, the polarization of the graphite anode, and reducing the battery life, and achieve the insertion speed. The effect of optimization, optimized cycle life, improved transfer speed

Active Publication Date: 2021-04-13
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the orderly stacked layered structure of graphite anodes in lithium-ion batteries, the speed at which lithium ions can be inserted into graphite is limited when charging with a large current, resulting in greater polarization of graphite anodes, a drop in the potential for lithium, and even There is a risk of battery short-circuit and fire due to lithium precipitation at the graphite negative electrode
In addition, if the fast charging current is too large, the polarization of the graphite negative electrode will be large, and the DCIR value will be large, resulting in large heat generation and high temperature. Excessive consumption of the electrolyte will reduce the battery life, the shrinkage of the diaphragm will cause a short circuit of the battery, and the temperature of the aluminum tab of the positive electrode will increase. The phenomenon that the ear glue falls off and leaks when it is too high

Method used

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  • A kind of negative electrode active material and its preparation method and application
  • A kind of negative electrode active material and its preparation method and application
  • A kind of negative electrode active material and its preparation method and application

Examples

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preparation example Construction

[0042] The present invention also provides a method for preparing any one of the above negative electrode active materials, comprising the following steps:

[0043] 1) Combining graphite with Li-rich antiperovskite material Li 3 OX mixed and ground to obtain a mixture;

[0044] 2) heating the mixture to 282-400° C., keeping it warm, and cooling to obtain the negative electrode active material.

[0045] In step 1), the graphite can be selected from one of natural graphite, artificial graphite and mesocarbon microspheres, and the further particle size can be 30-100 μm; the lithium-rich antiperovskite material Li 3 OX can be selected from Li 3 OF, Li 3 OCl, Li 3 OBr, Li 3 OI, Li 3 OA x B y (A, B are selected from one of F, Cl, Br, and I and are different from each other, x+y=1) or a combination thereof.

[0046] Specifically, during the grinding process, graphite and lithium-rich antiperovskite materials Li 3 OX for grinding treatment, generally, the grinding time is at...

Embodiment 1

[0068] The preparation method of the negative electrode active material of the present embodiment comprises the following steps:

[0069] The Li-rich antiperovskite material Li 3 OCl and graphite powder with a particle size of 20 μm (lithium-rich antiperovskite material Li 3 The mass ratio of OX and graphite powder is 0.01:1) and put it in a glove box (moisture and oxygen content less than 0.5ppm) to grind for 1h, put the ground mixture in a stainless steel reaction kettle, heat it to 350°C, and keep it warm for 24h , rapid cooling (cooling to 25° C. within 5 min), to obtain the negative electrode active material G1 of this embodiment.

Embodiment 2

[0071] The preparation method of the negative electrode active material G2 in this example is basically the same as that in Example 1, the only difference is that in this example, the lithium-rich antiperovskite material Li 3 The mass ratio of OCl and graphite powder is 0.02:1.

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Abstract

The present invention provides a negative electrode active material and its preparation method and application. The negative electrode active material includes a graphite intercalation compound and a coating layer covering graphite in the graphite intercalation compound; wherein, in the graphite intercalation compound The material of the intercalation agent and the cladding layer includes the Li-rich antiperovskite material Li 3 OX, X is selected from at least one halogen atom. The negative electrode active material can accelerate the transmission speed of lithium ions, improve the diffusion capacity of lithium ions, and is beneficial to improve the cycle performance and fast charging performance of lithium ion batteries.

Description

technical field [0001] The invention relates to a negative electrode active material, in particular to a negative electrode active material and a preparation method and application thereof, belonging to the technical field of batteries. Background technique [0002] At this stage, regardless of the 3C consumer field or the power new energy field, fast-charging lithium-ion batteries have gradually become the mainstream. Especially for power lithium-ion batteries, while pursuing a cruising range, they also pursue high-current fast charging to indirectly increase the cruising range. [0003] However, since the lithium-ion battery graphite negative electrode has an orderly stacked layered structure, the speed at which lithium ions can be inserted into graphite is limited when charging with a large current, resulting in a larger polarization of the graphite negative electrode, a decrease in the potential for lithium, and even There is a risk of battery short-circuit and fire due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M10/0525
CPCH01M4/133H01M4/366H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 田义军申红光李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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