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A kind of positive electrode active material and preparation method thereof, positive electrode sheet and lithium ion battery

A cathode active material and cathode material technology, applied in the field of lithium ion secondary batteries, can solve problems such as low energy density, and achieve the effect of ensuring cycle performance and excellent comprehensive electrochemical performance

Active Publication Date: 2019-02-12
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a positive electrode active material for the problem of low energy density of lithium-ion batteries in the prior art

Method used

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Examples

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preparation example Construction

[0026] Simultaneously, the present invention also provides the preparation method of above-mentioned cathode active material, comprises the following steps:

[0027] S1. Provide a core material; the core material includes nanoparticles and micro particles, the average particle size of the nanoparticles is 100-600nm, and the average particle size of the micro particles is 1-20 μm;

[0028] Both the nanoparticles and the microparticles have the general formula X 6 [YMo 9 o 32 ] one or more of the substances; X is selected from NH 4 + One of , K, Na, Y selected from one of Ni, Mn;

[0029] S2. Dispersing the core material in a mixed solvent of water and a water-soluble alcoholic organic solvent to obtain a mixed solution;

[0030] S3, adding a dopant, an oxidizing agent and a polymerization agent to the mixed liquid, reacting under stirring conditions, and obtaining the positive electrode active material after filtering and drying;

[0031] The dopant is selected from sodiu...

Embodiment 1

[0069] This example is used to illustrate the positive electrode active material disclosed in the present invention, its preparation method, positive electrode sheet and lithium ion battery.

[0070] 1. Preparation of positive electrode active material

[0071] 17.48g (14.14mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 100ml of deionized water, and after it was completely dissolved, the solution was heated and boiled for 5min, and then 100ml of NiSO dissolved in 2.64g (10.04mmol) was added. 4 ·6H 2 O and 3.2g (14.02mmol) (NH 4 ) 2 S 2 o 8 solution. Boil the solution again for 5 min, then filter, collect the filtrate, cool the filtrate naturally and stir, and finally precipitate out. Adopt the mixed solvent of water and water-soluble organic solvent (such as ethanol) by volume ratio 1: 1 to precipitate to wash 3-4 times, carry out suction filtration subsequently, dry, obtain molecular formula as (NH 4 ) 6 [NiMo 9 o 32 ] Crystals.

[0072] 5 g of the above...

Embodiment 2

[0079] This example is used to illustrate the positive electrode active material disclosed in the present invention, its preparation method, positive electrode sheet and lithium ion battery.

[0080] 1. Preparation of positive electrode active material

[0081] 17.48g (14.14mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 100ml of deionized water, and after it was completely dissolved, the solution was heated and boiled for 5min, and then 100ml of NiSO dissolved in 2.64g (10.04mmol) was added. 4 ·6H 2 O and 3.2g (14.02mmol) (NH 4 ) 2 S 2 o 8 solution. Boil the solution again for 5 min, then filter, collect the filtrate, cool the filtrate naturally and stir, and finally precipitate out. Adopt the mixed solvent of water and water-soluble organic solvent (such as ethanol) by volume ratio 1: 1 to precipitate to wash 3-4 times, carry out suction filtration subsequently, dry, obtain molecular formula as (NH 4 ) 6 [NiMo 9 o 32 ] Crystals.

[0082] 10g of (NH 4 ) ...

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Abstract

In order to overcome the problem of low energy density of a lithium ion battery cathode in the prior art, the invention provides a cathode active material, which comprises a core material and a clad material which coats the core material. The core material comprises nano-particles and microparticles. The average particle size of the nano-particles is 100-600 nm; the average particle size of the microparticles is 1-20 microns. The nano-particles and the microparticles are one or more substances from substances with the general formula X6[YMo9O32], wherein X is selected from one of NH4<+>, K and Na, and Y is selected from one of Ni and Mn. The clad material is a conducting polymer. The invention also discloses a preparation method of the cathode active material, a positive plate containing the cathode active material and a lithium ion battery. In the cathode active material particles prepared by the method, the clad material coats the core material such that ionic conductivity and electronic conductivity of the cathode active material are high and effective gram volume is high. Thus, it helps raise energy density of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a positive electrode active material, a preparation method thereof, a positive electrode sheet and a lithium ion battery. Background technique [0002] In today's daily life, lithium-ion secondary batteries have been widely used in mobile phones, notebook computers and other digital products, and are indispensable energy storage devices. At present, the cathode materials used in lithium-ion batteries mainly use lithium-ion intercalation transition metal layered oxides, such as LiCoO 2 , LiMn 2 o 4 Wait. The charge-discharge process of this type of material depends on the orderly insertion and deintercalation of lithium ions in its lattice structure, and the capacity and cycle stability of these materials are mainly determined by the stability of their crystal structure. During the charging and discharging process, once the crystal structure is damaged or loses i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/624H01M10/0525Y02E60/10
Inventor 倪尔福欧全勋程君李文良
Owner HIGHPOWER TECH HUIZHOU
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