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Lithium battery composite positive electrode material and lithium battery preparation method

A composite cathode material, lithium battery technology, applied in battery electrodes, lithium storage batteries, positive electrodes and other directions, can solve the problems of low discharge voltage, poor low temperature performance, poor temperature characteristics of ternary materials, etc., to eliminate negative effects, improve safety effect

Inactive Publication Date: 2019-11-12
ZHEJIANG GEELY HOLDING (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as we all know, the safety problem of ternary lithium batteries has not been completely solved, especially the ternary lithium batteries with high nickel content.
[0006] In order to solve the shortcomings of lithium iron phosphate batteries such as low specific energy, poor low temperature performance, low discharge voltage, and short vehicle cruising range, and to avoid the shortcomings of ternary materials (NCM) such as poor temperature characteristics, poor stability, and cyclicity, a new battery was developed. Lithium battery cathode materials are imminent

Method used

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  • Lithium battery composite positive electrode material and lithium battery preparation method
  • Lithium battery composite positive electrode material and lithium battery preparation method
  • Lithium battery composite positive electrode material and lithium battery preparation method

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Embodiment 1

[0041] This embodiment 1 provides a lithium battery composite positive electrode material, including lithium manganese iron phosphate and a ternary material, the lithium manganese iron phosphate occupies 20% to 30% of the mass of the composite positive electrode material, and the ternary material occupies all 70% to 80% of the mass of the composite cathode material.

[0042] Specifically, the chemical formula of the lithium manganese iron phosphate is LiMn 0.83 Fe 0.17 PO 4 .

[0043] Specifically, the ternary material is at least one of nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material and lithium-rich ternary material.

[0044] see figure 1 , the lithium battery preparation method based on the above-mentioned lithium battery composite cathode material is as follows:

[0045] S1: A mixture slurry of composite positive electrode materials prepared based on lithium manganese iron phosphate and ternary materials.

[0046] like figure 2 As ...

Embodiment 2

[0076] The second embodiment provides a lithium battery composite positive electrode material, including lithium manganese iron phosphate and a ternary material, the mass of the lithium manganese iron phosphate accounts for 20% to 30% of the mass of the composite positive electrode material, and the mass of the ternary material It occupies 70%-80% of the mass of the composite positive electrode material.

[0077] Specifically, the chemical formula of the lithium manganese iron phosphate is LiMn 0.83 Fe 0.17 PO 4 .

[0078] Specifically, the ternary material is at least one of nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material and lithium-rich ternary material.

[0079] see figure 1 , the lithium battery preparation method based on the above-mentioned lithium battery composite cathode material is as follows:

[0080] S1: A mixture slurry of composite positive electrode materials prepared based on lithium manganese iron phosphate and ternary m...

Embodiment 3

[0112] The third embodiment provides a lithium battery composite positive electrode material, including lithium manganese iron phosphate and a ternary material, the mass of the lithium manganese iron phosphate accounts for 20% to 30% of the mass of the composite positive electrode material, and the mass of the ternary material It occupies 70%-80% of the mass of the composite positive electrode material.

[0113] Specifically, the chemical formula of the lithium manganese iron phosphate is LiMn 0.83 Fe 0.17 PO 4 .

[0114] Specifically, the ternary material is at least one of nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material and lithium-rich ternary material.

[0115] see figure 1 , the lithium battery preparation method based on the above-mentioned lithium battery composite cathode material is as follows:

[0116] S1: A mixture slurry of composite positive electrode materials prepared based on lithium manganese iron phosphate and ternary ma...

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Abstract

The invention relates to the technical field of electric vehicles, in particular to a lithium battery composite positive electrode material and a lithium battery preparation method. The lithium battery composite positive electrode material comprises lithium manganese iron phosphate and a ternary material, wherein the mass of the lithium manganese iron phosphate accounts for 20-30% of the mass of the composite positive electrode material, and the mass of the ternary material accounts for 70-80% of the mass of the composite positive electrode material. By the adoption of the composite material,the safety, the temperature characteristic and the cycle property of the positive electrode material can be improved; and meanwhile, with the adoption of a graphene conductive agent, the addition dosage of the conductive agent can be reduced, so that the content of an active substance is improved, and the unfavorable influence of the lithium manganese iron phosphate on specific energy of the lithium battery is eliminated.

Description

technical field [0001] The invention relates to the technical field of lithium battery positive electrode materials, in particular to a lithium battery composite positive electrode material and a lithium battery preparation method. Background technique [0002] With the depletion of traditional energy, the development and utilization of new energy has attracted more and more attention. In the automotive industry, the new energy vehicle industry development report shows that my country is the country with the largest number of new energy vehicles in the world, and the sales volume in 2016 alone reached 50.7 million vehicles. With the explosive growth of new energy vehicles, the scale of my country's new energy vehicle market will reach 2 million in 2020. [0003] The national subsidy policy links the amount of subsidy for pure electric vehicles with the specific energy of the battery pack and the cruising range; the specific energy index of the battery directly affects the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/052
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/052H01M2004/028Y02E60/10
Inventor 戴先逢许海涛田丰徐丹琼
Owner ZHEJIANG GEELY HOLDING (GROUP) CO LTD