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Positive electrode active material, lithium ion battery and preparation method thereof

A positive electrode active material and lithium-ion battery technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of increasing the production cost of lithium-ion batteries, limiting lithium-ion batteries, and low volume density, and achieving commercial The effect of modernized production and application, simple process and high volume density

Inactive Publication Date: 2018-06-29
BEIJING NAT BATTERY TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The performance of lithium-ion batteries mainly depends on the positive and negative electrode materials. The positive electrode material of ternary lithium-ion batteries LiNi x co y mn 1-x-y o 2 (NCM) is considered to be a very promising anode material for lithium-ion power batteries due to its high specific capacity. However, its volume density is low, its cost is slightly higher, and its safety is slightly worse. performance, but also increase the production cost of lithium-ion batteries

Method used

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  • Positive electrode active material, lithium ion battery and preparation method thereof
  • Positive electrode active material, lithium ion battery and preparation method thereof

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preparation example Construction

[0054] In a third aspect, in at least one embodiment, a method for preparing the above-mentioned lithium-ion battery is provided, comprising the following steps: (a) coating the positive electrode material and the negative electrode material comprising the positive electrode active material on the positive electrode current collector and the negative electrode material, respectively. Both sides of the negative electrode current collector are then dried and compacted to form positive and negative electrodes;

[0055] (b) Assembling the positive electrode sheet and the negative electrode sheet into a battery cell according to the required size;

[0056] (c) Putting the electric core into the casing, then injecting electrolyte solution into the casing, and then sealing to obtain the lithium ion battery.

[0057] The preparation method of the above-mentioned lithium-ion battery is simple in process, scientific and reasonable, and the prepared lithium-ion battery has the advantages...

Embodiment 1

[0062] A positive electrode active material, comprising 6 parts by mass of a 532-type ternary material, 1 part by mass of lithium iron manganese phosphate and 1 part by mass of lithium manganate;

[0063] The chemical formula of the 532 type ternary material is LiNi 0.5 mn 0.3 co 0.2 o 2 ; The chemical formula of lithium manganese iron phosphate is LiMn 0.5 Fe 0.5 PO 4 .

Embodiment 2

[0065] A positive electrode active material, comprising 8 parts by mass of a 532-type ternary material, 3 parts by mass of lithium iron manganese phosphate and 3 parts by mass of lithium manganate;

[0066] The chemical formula of the 532 type ternary material is LiNi 0.5 mn 0.3 co 0.2 o 2 ; The chemical formula of lithium manganese iron phosphate is LiMn 0.95 Fe 0.05 PO 4 .

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Abstract

The invention relates to the field of lithium ion batteries, and in particular to a positive electrode active material, a lithium ion battery, and a preparation method thereof. The positive electrodeactive material is prepared from the following components in parts by mass: 6 to 8 parts of a 532 type ternary material, 1 to 3 parts of lithium manganese iron phosphate and 1 to 3 parts of lithium manganate; a chemical formula of the 532 type ternary material is LiNi0.5Mn0.3Co0.2O2; a chemical formula of lithium manganese iron phosphate is LiMnxFe1-xPO4. The positive electrode active material hasthe advantages of high bulk density, high safety and low cost.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode active material, a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life and high energy density. With the continuous update and development of lithium battery technology, its advantages of light weight, high capacity and long life are gradually favored by consumers. The lithium battery market has expanded from mobile phones to cameras, DVDs, aviation films, toys and other fields. In recent years, lithium-ion batteries have been widely used not only in portable electronic devices, but also in large and medium-sized electric devices such as electric vehicles, electric bicycles, and electric tools due to their advantages such as high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525H01M10/058
CPCH01M4/364H01M4/5825H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 苏凯乔乔路文宁
Owner BEIJING NAT BATTERY TECH
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