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Positive electrode material for lithium-ion battery and preparation method and application thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of material conductivity not being greatly improved, poor carbon conductivity, loose particles, etc., to shorten ion transport Distance, prevention of dissolution in the electrolyte, and the effect of improving conductivity

Active Publication Date: 2017-06-06
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, the conductivity of the material has not been greatly improved by coating lithium iron phosphate

Method used

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  • Positive electrode material for lithium-ion battery and preparation method and application thereof
  • Positive electrode material for lithium-ion battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Lithium hydroxide, manganese carbonate, ammonium phosphate, tartaric acid according to Li:Mn:PO 4 : H molar ratio 1:1:1:1 mixed, dissolved in a certain ethanol / water mixed solvent to obtain a slurry with a solid content of 65%. A certain amount of single-layer CNT was added to the slurry, and the slurry was ball-milled at a speed of 300r / min for 15h, then dried at 90°C, ground, and passed through a 400-mesh sieve to obtain a mixture of LMP precursor and CNT. The mixture was baked at 650° C. in a tube furnace in a nitrogen atmosphere for 8 hours to obtain an LMP / CNT core-shell material, CNT accounted for 2.5 wt % of the core-shell material, and the particle size of LMP was 100-200 nm.

[0030] PEO with a mass fraction of 0.06% (Mw=1×10 5 ) acetonitrile solution, a certain amount of LMP / CNT core-shell material was added into the solution, then magnetically stirred in an oil bath for 12 hours, and cooled. A high-speed centrifuge is used to separate the solid and liquid t...

Embodiment 2

[0032] Lithium carbonate, manganese acetate, ammonium phosphate, oxalic acid were Li:Mn:PO 4 :H molar ratio 1.5:1:1:1 mixed, dissolved in a certain ethanol solvent to obtain a slurry with a solid content of 70%. A certain amount of 10-layer stacked CNTs was added to the slurry, and the slurry was ball-milled at 400r / min for 10h, then dried at 90°C, ground, and passed through a 400-mesh sieve to obtain a mixture of LMP precursor and CNT. mixture. The mixture was baked at 600° C. in a tube furnace in a nitrogen atmosphere for 8 hours to obtain an LMP / CNT core-shell material, CNT accounted for 2 wt % of the core-shell material, and the particle size of LMP was 100-250 nm.

[0033] PEO with a mass fraction of 0.1% (Mw=1×10 6 ) acetonitrile solution, a certain amount of LMP / CNT core-shell material was added into the solution, then magnetically stirred in an oil bath for 15 h, and cooled. A high-speed centrifuge is used to separate the solid and liquid to remove acetonitrile, dry...

Embodiment 3

[0035] Lithium nitrate, manganese oxalate, ammonium dihydrogen phosphate, malic acid according to Li:Mn:PO 4: H molar ratio 2:1:1:1 mixed, dissolved in a certain acetone / water mixed solvent to obtain a slurry with a solid content of 75%. A certain amount of 20-layer stacked CNTs was added to the slurry, and the slurry was ball-milled for 20 hours at a rotational speed of 200r / min, then dried at 90°C, ground, and passed through a 400-mesh screen to obtain a mixture of LMP precursors and CNTs. mixture. The mixture was baked in a tube furnace under nitrogen atmosphere at 500° C. for 15 hours to obtain an LMP / CNT core-shell material, CNT accounted for 4 wt % of the core-shell material, and the particle size of LMP was 50-150 nm.

[0036] PEO with a mass fraction of 0.14% (Mw=7.5×10 6 ) acetonitrile solution, a certain amount of LMP / CNT core-shell material was added into the solution, then magnetically stirred in an oil bath for 18h, and cooled. A high-speed centrifuge is used t...

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Abstract

The invention relates to a positive electrode material for a lithium-ion battery and a preparation method and application thereof. According to the positive electrode material, a CNT is taken as a core and the CNT core is coated with an LMP to form an LMP / CNT core-shell material; and a PEO film also coats the surface of the LMP / CNT core-shell material, wherein the mass percent of the CNT in the LMP / CNT core-shell material is 1-10%; and the mass percent of the PEO film on the positive electrode material is 0.5-5%. After the LMP / CNT core-shell material is coated with the PEO film, tight contact of the LMP and the CNT is promoted, the targets of further improving the conductivity of the material and shortening the ion transport distance are achieved, direct contact of the LMP and an electrolyte can be prevented, manganese ions are prevented from being dissolved into the electrolyte and the capacity attenuation rate is reduced. When the positive electrode material is applied to the lithium-ion battery, the rate capability and the cycle performance of the lithium-ion battery can be greatly 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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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 阮殿波李林艳周洲黄益陈雪丹
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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