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Novel ultra-low temperature lithium-ion battery and preparation method thereof

A lithium-ion battery, ultra-low temperature technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as failure to use normally, decline in discharge rate performance, and decline in discharge capacity, so as to compensate for the decline in conductivity and improve various Isotropic, the effect of improving conductivity

Active Publication Date: 2021-02-05
西安中科爱姆特新能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the discharge capacity of lithium-ion batteries will be severely reduced at low temperatures. For example, at -40°C, the low-temperature discharge capacity of lithium-ion batteries can only reach 10%-30% of the discharge capacity at room temperature, and the discharge rate performance also drops greatly. At -60°C The ultra-low temperature environment cannot be used normally at all

Method used

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  • Novel ultra-low temperature lithium-ion battery and preparation method thereof
  • Novel ultra-low temperature lithium-ion battery and preparation method thereof
  • Novel ultra-low temperature lithium-ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for preparing positive electrode active materials, firstly, CeO with a particle size of 10 μm-30 μm 2 Mix evenly with MgO at a mass ratio of 1:1, and then add 4 parts of the mixed powder to 100 parts of LiCoO 2 In, and mixed uniformly; then sintered in a sintering furnace to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Ce and Mg.

[0051] Further, the sintering condition is sintering at a temperature of 950° C. for 10 h in an inert gas atmosphere; in this embodiment, the rare earth element is Ce, and the alkaline earth metal is Mg.

[0052] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

Embodiment 2

[0054] A method for preparing positive electrode active materials, firstly, CeO with a particle size of 10 μm-30 μm 2 and MgO in a mass ratio of 1:1, and then in parts by mass, take 2 parts of the mixed powder and add it to 100 parts of LiCoO 2 In, and mixed uniformly; then sintered to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Ce and Mg.

[0055] Further, the sintering condition is sintering at a temperature of 900° C. for 13 hours in an inert gas atmosphere; in this embodiment, the rare earth element is Ce, and the alkaline earth metal is Mg.

[0056] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

Embodiment 3

[0058] A method for preparing positive electrode active materials, firstly Y 2 o 3 and MgO in a mass ratio of 1:1, and then in parts by mass, take 2 parts of the mixed powder and add it to 100 parts of LiCoO 2 In, and mixed uniformly; then sintered to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Y and Mg.

[0059] Further, the sintering condition is sintering at a temperature of 850° C. for 15 hours in an inert gas atmosphere; in this embodiment, the rare earth element is Y, and the alkaline earth metal is Mg.

[0060] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

[0061] It should be noted that, in order to further illustrate the excellent performance of the positive electrode active materials prepared in the present invention, the present invention ha...

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Abstract

The invention discloses a novel ultra-low temperature lithium-ion battery and a preparation method thereof. The invention starts from the perspective of improving the diffusion ability of lithium ions in active materials and the performance of the electrode interface, and effectively improves the The electrochemical reversibility and low-temperature conductivity of lithium ions improve the specific capacity of the electrode. The lithium-ion battery prepared by the preparation method of the present invention is discharged at 0.2C under the ultra-low temperature environment of -60°C, and the capacity retention rate can still reach more than 80%, and it can be charged normally under the temperature of -60°C, which breaks through the traditional The technical problem that lithium-ion batteries are difficult to use normally at low temperatures below -20°C has greatly broadened the application range of lithium-ion batteries in military equipment.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a novel ultra-low temperature lithium ion battery and a preparation method thereof. Background technique [0002] As a new generation of green energy, lithium-ion batteries have the advantages of high working voltage, long cycle life, light weight, high energy density, good rate performance and safety performance, small self-discharge, no memory effect, and no environmental pollution. Applied to various fields such as electronics, transportation, medical treatment, aviation, etc., with the continuous expansion of the application field and application range, higher requirements are put forward for the performance of the battery. However, the low-temperature discharge performance of traditional lithium-ion batteries is poor, especially the low-temperature charging performance. Most lithium batteries are difficult to use normally below -20°C, which greatly restricts their use in high latitud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/587H01M4/62H01M10/0525H01M10/058
CPCH01M4/362H01M4/525H01M4/587H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张洪白彬王红飞张遂超蒋昱东赵佑军
Owner 西安中科爱姆特新能源科技有限责任公司
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