Lithium-ion battery positive electrode material and its preparation method and application

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing energy consumption demand and production cost, poor carbon conductivity, loose particles, etc., to improve the surface migration rate. , The effect of improving rate performance and inhibiting dissolution

Active Publication Date: 2019-09-13
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this technology is that there is a gap between the carbon particles and the LMP particles, the particles are relatively loose, and the LMP and carbon are easily detached, resulting in poor conductivity of the carbon.
However, since the conductive polymer in this patent needs to be heat-treated, energy consumption requirements and production costs are increased

Method used

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  • Lithium-ion battery positive electrode material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Lithium hydroxide, manganese carbonate, ammonium phosphate, tartaric acid according to Li:Mn:PO 4 : H molar ratio of 1:1:1:1 mixed, ball milled in an ethanol solvent for 15 hours to obtain a slurry with a solid content of 65%. Then dry at 90°C, grind, and pass through a 400-mesh sieve to obtain the LMP precursor. Then the precursor is baked at 650° C. in a tube furnace in a nitrogen atmosphere for 8 hours to obtain LMP with a particle size of 100-200 nm.

[0040] Weigh 1g of LMP and place it in an aqueous solution containing 0.01g of Triton X-100 surfactant, after several times of ultrasonic stirring to make it uniformly dispersed, evaporate water at room temperature, and grind to obtain LMP / PEG composite material.

[0041] Add LMP / PEG composite material and deionized water into a three-necked flask containing chloroform, pass through Ar as a protective gas and perform mechanical stirring. After 1 hour, inject thiophene monomer drop by drop. After uniform mixing, add o...

Embodiment 2

[0043] Lithium hydroxide, manganese carbonate, ammonium phosphate, tartaric acid according to Li:Mn:PO 4 : H molar ratio of 1.5:1:1:1 mixed, ball milled in an ethanol solvent for 15 hours, to obtain a slurry with a solid content of 65%. Then dry at 90°C, grind, and pass through a 400-mesh sieve to obtain the LMP precursor. Then the precursor is baked at 600° C. in a tube furnace in a nitrogen atmosphere for 8 hours to obtain LMP with a particle size of 100-250 nm.

[0044] Weigh 1g of LMP and place it in an aqueous solution containing 0.015g of Triton X-100 surfactant, after several times of ultrasonic stirring to make it uniformly dispersed, evaporate water at room temperature, and grind to obtain LMP / PEG composite material.

[0045] Add LMP / PEG composite material and deionized water into a three-necked flask containing chloroform, pass through Ar as a protective gas and perform mechanical stirring. After 1 hour, inject thiophene monomer drop by drop. After uniform mixing, a...

Embodiment 3

[0047] Lithium hydroxide, manganese carbonate, ammonium phosphate, tartaric acid according to Li:Mn:PO 4 : H molar ratio is 2:1:1:1 mixed, ball milled in acetone / water solvent for 20h, to obtain a slurry with a solid content of 75%. Then dry at 90°C, grind, and pass through a 400-mesh sieve to obtain the LMP precursor. Then the precursor is baked at 500° C. in a tube furnace in a nitrogen atmosphere for 15 hours to obtain LMP with a particle size of 50-150 nm.

[0048] Weigh 1g of LMP and place it in an aqueous solution containing 0.02g of Triton X-100 surfactant, after several times of ultrasonic stirring to make it uniformly dispersed, evaporate water at room temperature, and grind to obtain LMP / PEG composite material.

[0049] Add LMP / PEG composite material and deionized water into a three-necked flask containing chloroform, pass through Ar as a protective gas and perform mechanical stirring. After 1 hour, inject thiophene monomer drop by drop. After uniform mixing, add ox...

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Abstract

The invention relates to an anode material for a lithium ion battery as well as a preparation method and application of the anode material. The anode material is an LMP / PEG-PTh composite material, wherein the mass percentage of PTh in the LMP / PEG-PTh composite material is 1%-15%. The preparation method of the anode material comprises the following steps: with an LMP material as a kernel, attaching PEG to the surface of the LMP kernel, so as to obtain an LMP / PEG composite material; and depositing a conductive polymer PTh on the surface of the LMP / PEG composite material, so as to obtain the LMP / PEG-PTh composite material. According to the invention, the PEG can form a cladding layer on the surface of the LMP so as to restrain the dissolving of manganese and is a good solid polymer electrolyte matrix capable of promoting the transmission of lithium ions; and by utilizing a PTh cladding layer with relatively high conductivity, the load transfer resistance among LMP interfaces can be reduced, the surface migration rates of the lithium ions and electrons can be increased, and therefore, the rate capability of an electrode is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery cathode material, a preparation method thereof and an application in lithium ion batteries. Background technique [0002] Power lithium-ion batteries have the advantages of long life, high energy density and high voltage platform, and are an important direction for the development of the new energy industry. At present, the commonly used cathode materials for lithium ions are mainly lithium transition metal oxides, including LiCoO 2 、LiNi 1 / 3 co l / 3 mn 1 / 3O 2 , LiMn with spinel structure 2 o 4 And polyanionic cathode materials such as LiFePO with olivine structure 4 . [0003] LiMnPO 4 (LMP) also belongs to the olivine structure, orthorhombic crystal system, and its special structure makes it have excellent thermodynamic and kinetic stability. As a positive electrode material, it has a high potential of 4.1V, is in the stable electrochemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 阮殿波李林艳周洲黄益乔志军
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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