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NCM (Nickel Cobalt Manganese)-lithium iron phosphate anode material, lithium ion battery and preparation method of lithium ion battery

A composite cathode material, lithium-ion battery technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor safety, high cost, general cycle performance, etc., achieve low cost, high specific capacity, use The effect of a wide voltage range

Inactive Publication Date: 2018-04-20
BEIJING NAT BATTERY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, but its cost is slightly higher, its cycle performance is average, and its safety is slightly worse.

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  • NCM (Nickel Cobalt Manganese)-lithium iron phosphate anode material, lithium ion battery and preparation method of lithium ion battery
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preparation example Construction

[0042] 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) respectively preparing the positive electrode slurry and the negative electrode slurry comprising the NCM-lithium iron phosphate composite positive electrode material Coated on both sides of the positive electrode current collector and the negative electrode current collector, and then dried and compacted to form the positive electrode sheet and the negative electrode sheet;

[0043] (b) Cutting the positive electrode sheet and the negative electrode sheet into the required size respectively and assembling them into batteries;

[0044] (c) Putting the battery cells into the case, injecting electrolyte into the case, sealing the case, and finally performing formation and volume separation to obtain the lithium-ion battery.

[0045] The preparation method of the lithium-ion battery is simple, scientific and reasonab...

Embodiment 1

[0056] A kind of NCM-lithium iron phosphate composite cathode material, mainly composed of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 It is composed of ternary materials and lithium iron phosphate, and the quality of lithium iron phosphate is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 20% of ternary material.

Embodiment 2

[0058] A kind of NCM-lithium iron phosphate composite cathode material, mainly composed of LiNi 0.5 co 0.2 mn 0.3 o 2 Composite ternary material and lithium iron phosphate, the quality of lithium iron phosphate is LiNi0.5 co 0.2 mn 0.3 o 2 35% of ternary material.

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Abstract

The invention relates to the field of lithium ion batteries and in particular provides an NCM (Nickel Cobalt Manganese)-lithium iron phosphate anode material, a lithium ion battery and a preparation method of the lithium ion battery. The NCM-lithium iron phosphate anode material is mainly prepared from an LiNixCoyMn(1-x-y)O2 ternary material and lithium iron phosphate through compounding, whereinlithium iron phosphate accounts for 20-80% of the mass of the LiNixCoyMn(1-x-y)O2 ternary material; x is greater than 0 and less than 1; y is greater than 0 and less than 1; 1-x-y is greater than 0 and less than 1. By adopting the composite anode material, the use voltage range of a battery is increased, the specific capacity of the battery is increased, the service life of the battery is prolonged, and meanwhile the cost is reduced because of a relatively large raw material reserve.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an NCM-lithium iron phosphate composite positive electrode 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/058
CPCH01M4/362H01M4/364H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 苏凯乔乔陆文宁
Owner BEIJING NAT BATTERY TECH