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Lithium ion battery, positive active material thereof and preparation method of positive active material

A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that it is difficult to achieve the complete coating of particles

Active Publication Date: 2013-05-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of metal fluoride and lithium phosphate is too large, the specific capacity of the entire positive electrode active material will be reduced; but if the amount of metal fluoride and lithium phosphate is too small, it is difficult to achieve the effect that all particles are coated

Method used

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  • Lithium ion battery, positive active material thereof and preparation method of positive active material

Examples

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preparation example Construction

[0026] According to the preparation method of the positive electrode active material of lithium ion battery according to the second aspect of the present invention, it is used to prepare the positive electrode active material of lithium ion battery according to the first aspect of the present invention, comprising the following steps: preparing the second positive electrode by sol-gel method Active material Li b V 2-u M' u (PO 4 ) 3 Precursor gel; the first positive electrode active material is added in the second positive electrode active material precursor gel, so that the second positive electrode active material precursor gel coats the first positive electrode active material; the second positive electrode active material precursor The gel-coated first positive electrode active material is dried; the second positive electrode active material precursor gel-coated first positive electrode active material is calcined under a protective atmosphere.

[0027] It is easier to...

Embodiment 1

[0039] Preparation of positive electrode active materials: LiOH, NH 4 VO 3 、H 3 PO 4 and citric acid as raw materials, according to Li 3 V 2 (PO 4 ) 3 The stoichiometric ratio of ingredients, the number of moles of citric acid is 1 times of the total number of moles of vanadium, then add pure water, and stir for 10h at a constant temperature of 80°C to form a gel (that is, to prepare the second positive electrode active material precursor gel ), wherein the amount of pure water added is enough to form the second positive electrode active material precursor gel;

[0040] Then follow Li 3 V 2 (PO 4 ) 3 with LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The molar ratio is 1:99 by adding LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 powder (the first positive electrode active material, commercially available) into the second positive electrode active material precursor gel, mixed thoroughly, spray-dried, and calcined at 700°C for 6h under an argon atmosphere to obtain Li 3 V 2 (PO 4 ) 3 Coated Li...

Embodiment 2

[0048] Preparation of positive electrode active material: the rest of the steps are the same as those in Example 1 for preparing the positive electrode active material, the difference is that Li 3 V 2 (PO 4 ) 3 with LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The mol ratio is 20:80;

[0049] The preparation of the positive electrode sheet, the preparation of the negative electrode sheet, and the preparation of the lithium-ion battery are the same as in Example 1.

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Abstract

The invention provides a lithium ion battery, a positive active material thereof and a preparation method of the positive active material. The positive active material of the lithium ion battery comprises a first positive active material and a second positive active material, wherein the general formula of the first positive active material is Li1+aNixMnyMzO2, M is at least one of Co, Al, Mg, Zr, Ti, Ca, V and Sr, a is smaller than or equal to 0.1 and larger than or equal to 0, and a+x+y+z is equal to 1, x is smaller than 0.8 and larger than 0, y is smaller than 0.6 and larger than 0, and z is smaller than 0.6 and larger than 0; and the second positive active material is wrapped on the surface of the first positive active material and has an NASICON structure, the universal formula of the second positive active material is LibV2-uM'u(PO4)3, b is smaller than or equal to 3 and larger than 2, u is smaller than or equal to 0.3 and larger than or equal to 0.1, and M' is at least one of Fe, Mn, Ni, Ti, Al and Mg. According to the invention, the positive active material of the lithium ion battery can improve the safety performance, the high voltage stability and the cycling performance of lithium transition metal oxide, and the specific capacity and the energy density of the whole positive active material can not be reduced; and in addition, through controlling the voltage, the overcharge of the lithium transition metal oxide can be prevented, and the structure collapse of the overcharged lithium transition metal oxide is effectively restrained, so that the safety performance is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery, a positive electrode active material thereof, and a preparation method of the positive electrode active material. Background technique [0002] In recent years, with the development of consumer electronics products such as mobile phones, notebook computers, and digital cameras, and energy and power products such as battery vehicles, electric tools, and energy storage devices, the market space for lithium-ion batteries has become larger and larger. As one of the most important parts of lithium-ion batteries, cathode materials for lithium-ion batteries have experienced explosive growth in usage. [0003] The positive electrode materials of small lithium-ion batteries used in consumer electronics mainly include lithium cobaltate and multi-element materials, while the positive electrode materials of power batteries used in power products are mainly spinel l...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 艾邓均
Owner NINGDE AMPEREX TECH
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