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Fluoride-modified nickel-enriched ternary composite electrode material and preparation method thereof

An electrode material, ternary composite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing surface impedance, fast capacity decay, poor stability of nickel-cobalt-manganese ternary electrode materials, etc., to achieve enhanced stability, The effect of increasing surface energy and enhancing cycling stability

Active Publication Date: 2018-11-13
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a nickel-rich ternary electrode material modified with fluoride. After the nickel-rich ternary electrode material is modified with fluoride, it can prevent the dissolution of metal ions in the active material and resist the corrosion of the active material by the electrolyte. Reduce the surface impedance and improve the cycle stability of the material, and solve the problem of poor stability and fast capacity fading of nickel-cobalt-manganese ternary electrode materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing 3.84g lithium carbonate, 9.5g nickel carbonate, 1.2g cobalt carbonate, 1.15g manganese carbonate and put in the ball mill jar, carry out ball mill with ball material ratio 1: 5, rotating speed is 50 rev / mins, dry mixes 10 hours, then Place in an oxygen atmosphere furnace, perform high-temperature sintering according to the steps of pre-sintering at 500°C for 5 hours, and sintering at 800°C for 12 hours to obtain a nickel-rich ternary electrode material.

[0033] Weigh 0.25g of cerium nitrate and dissolve it in 100ml of deionized water, fully stir to form a 0.0115mol / L solution, add 11g of nickel-rich ternary electrode material to the above solution, continue stirring and add deionized water to prepare a 110g / L suspension Liquid A.

[0034] Weigh 0.1278g of ammonium fluoride and dissolve it in 100ml of deionized water to form a solution B with a concentration of 0.035mol / L.

[0035] Add solution B to solution A at a rate of 1ml / min, and remove moisture ...

Embodiment 2

[0038] Take by weighing 3.84g lithium carbonate, 9.5g nickel carbonate, 1.2g cobalt carbonate, 1.15g manganese carbonate and put in the ball mill jar, carry out ball mill with ball material ratio 1: 5, rotating speed is 100 rev / mins, dry mixes 10 hours, then Place in an oxygen atmosphere furnace, perform high-temperature sintering according to the steps of pre-sintering at 500°C for 5 hours, and sintering at 800°C for 12 hours to obtain a nickel-rich ternary electrode material.

[0039] Weigh 0.75g of cerium nitrate and dissolve it in 100ml of deionized water, fully stir to form a 0.0173mol / L solution, add 11g of nickel-rich ternary electrode material to the above solution, continue stirring and add deionized water to prepare a 110g / L suspension Liquid A.

[0040] Weigh 0.1918g of ammonium fluoride and dissolve it in 100ml of deionized water to form a solution B with a concentration of 0.052mol / L.

[0041] Add solution B to solution A at a rate of 1ml / min, and remove moisture...

Embodiment 3

[0044] Take by weighing 3.84g lithium carbonate, 9.5g nickel carbonate, 1.2g cobalt carbonate, 1.15g manganese carbonate and put in the ball mill jar, carry out ball mill with ball material ratio 1: 5, rotating speed is 100 rev / mins, dry mixes 10 hours, then Place in an oxygen atmosphere furnace, perform high-temperature sintering according to the steps of pre-sintering at 500°C for 5 hours, and sintering at 800°C for 12 hours to obtain a nickel-rich ternary electrode material.

[0045] Weigh 1.25g cerium nitrate and dissolve it in 100ml deionized water, stir well to form 2.88×10 -2 mol / L solution, add 11g nickel-rich ternary electrode material to the above solution, continue to stir and add deionized water to prepare a suspension A of 110g / L.

[0046] Weigh 0.3196g of ammonium fluoride and dissolve it in 100ml of deionized water to form solution B with a concentration of 0.086mol / L.

[0047] Add solution B to solution A at a rate of 1ml / min, and remove moisture by standing, ...

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Abstract

The invention relates to a fluoride-modified nickel-enriched ternary composite electrode material. The fluoride-modified nickel-enriched ternary composite electrode material comprises a nickel-enriched ternary composite electrode material and a modifying layer, wherein the nickel-enriched ternary composite electrode material is prepared from the following raw materials: lithium carbonate, nickel carbonate, cobalt carbonate and manganese carbonate; the molar ratio of the lithium element, the nickel element, the cobalt element and the manganese element is (1.0-1.1):(0.6-0.8):(0.2-0.1):(0.2-0.1);the modifying layer is metal fluoride; the metal fluoride accounts for 1-5% of the mass percentage of the total electrode material. The invention further relates to a preparation method of the composite electrode material. After the nickel-enriched ternary electrode material is modified by the fluoride, dissolution of metal ions in an active material can be prevented, corrosion of the active material by an electrolyte can be resisted, the surface impedance can be reduced, the cycle stability of the material can be improved, and the problems of poor stability and fast capacity attenuation of the nickel-cobalt-manganese ternary electrode material can be solved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a fluoride-modified nickel-rich ternary composite electrode material and a preparation method thereof. Background technique [0002] Compared with traditional batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, low pollution, and no memory effect, and have been widely used in electronic products, mobile tools and other fields. As people pay more and more attention to environmental pollution, green and environmentally friendly electric vehicles powered by lithium ions or auxiliary power have begun to be advocated and paid attention to by people. [0003] Ternary lithium-ion battery cathode material is a new type of lithium-ion battery cathode material developed in recent years. Compared with lithium cobalt oxide material, it reduces production costs, improves safety performance, and has higher capacity than lithium manganese...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 何蕊刘振法张利辉李文魏爱佳白薛
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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