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A kind of ultra-low temperature lithium-ion battery and preparation method thereof

A lithium-ion battery, ultra-low temperature technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of decreased discharge capacity, decreased discharge rate performance, and failure to use normally, so as to improve isotropy and compensate for the decrease in conductivity , The effect of reducing the diffusion resistance

Active Publication Date: 2021-02-05
深圳市金力新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of ultra-low temperature lithium-ion battery and preparation method thereof
  • A kind of ultra-low temperature lithium-ion battery and preparation method thereof
  • A kind of ultra-low temperature lithium-ion battery and preparation method thereof

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preparation example Construction

[0029] A method for preparing a positive electrode active material. First, uniformly mix rare earth metal oxides and alkaline earth metal oxides at a mass ratio of 1:1, and then add 0.05-5 parts of mixed powder to 100 parts of LiCoO 2 Among them, sinter after mixing evenly to form LiCoMO compound, which can be obtained after jet milling and classification, where M represents a mixture of rare earth elements and alkaline earth metals.

[0030] Further, the sintering conditions are sintering at a temperature of 850°C-950°C for 10h-15h in an inert gas atmosphere; the rare earth elements include one of Sc, Y, La, Ce, Nd, Gd and Sm, so The alkaline earth metals include Mg.

[0031] 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.

[0032] A method for preparing an ultra-low temperature lithium-ion battery, first preparing positi...

Embodiment 1

[0047] 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 to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Ce and Mg.

[0048] 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.

[0049] 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

[0051] 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.

[0052] 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.

[0053] 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.

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Abstract

The invention discloses an 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 electrode interface performance, and effectively improves the lithium ion performance by optimizing the material properties and improving the pulping process. The ionic electrochemical reversibility and low-temperature electrical conductivity improve the electrode specific capacity. The lithium ion battery prepared by the preparation method of the present invention can be discharged at 0.2C under the ultra-low temperature environmental condition of -60°C, the capacity retention rate can still reach more than 80%, and can be charged normally under the temperature condition of -60°C, breaking 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 scope of lithium-ion batteries in military equipment.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an 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 latitudes, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张洪白彬王红飞张遂超蒋昱东赵佑军
Owner 深圳市金力新能源科技有限公司
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