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A kind of lithium iron phosphate composite cathode material and its preparation method and application

A composite cathode material, lithium iron phosphate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor conductivity of lithium iron phosphate cathode materials, restrict development and application, affect electrochemical performance, etc., to achieve excellent electrical properties. Chemical properties, improved electronic conductivity, good consistency

Active Publication Date: 2021-01-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of lithium iron phosphate cathode material affects its electrochemical performance and limits its further development and application.
The existing preparation technology still needs to be improved and developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Lithium hydroxide, ferrous phosphate, phosphoric acid, and phenolic resin are dissolved in the solvent according to the molar ratio of Li:Fe:P:C of 1.1:1:1:2 to obtain solution A;

[0027] (2) Disperse the titanium nitride material in the solution A according to the mass ratio of 10:1 to the final obtained lithium iron phosphate to obtain the titanium nitride dispersion solution B;

[0028] (3) Spray-dry the solution B in an argon atmosphere at 400°C to obtain a precursor powder;

[0029] (4) The precursor powder was heat-treated at 700° C. under a nitrogen atmosphere and kept at a temperature of 600 minutes to obtain a lithium iron phosphate cathode material.

[0030] The resulting LiFePO 4 The material is used as the positive electrode material of lithium ion battery for electrochemical performance test, and the ratio of the pole piece is LiFePO 4 Material: Acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared with a lithium sheet as a reference elect...

Embodiment 2

[0032] (1) Lithium acetate, lithium oxalate, ferric chloride, ammonium dihydrogen phosphate, ferric phosphate, and glucose were dissolved in the solvent according to the molar ratio of Li:Fe:P:C of 1.65:1:1:10 to obtain solution A;

[0033] (2) Disperse the titanium nitride material in the solution A according to the mass ratio of 0.01:1 to the final obtained lithium iron phosphate to obtain the titanium nitride dispersion solution B;

[0034] (3) Spray-dry the solution B in a nitrogen atmosphere at 150°C to obtain a precursor powder;

[0035] (4) The precursor powder was heat-treated at 900° C. in a mixed atmosphere of helium and argon, and kept for 1 min to obtain a lithium iron phosphate cathode material.

[0036] The resulting LiFePO 4 The material is used as the positive electrode material of lithium ion battery for electrochemical performance test, and the ratio of the pole piece is LiFePO 4 Material: Acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared wit...

Embodiment 3

[0038] (1) Lithium oxalate, ferrous phosphate, ferrous sulfate, phosphoric acid, and starch were dissolved in the solvent according to the molar ratio of Li:Fe:P:C 1.05:1:1:0.1 to obtain solution A;

[0039] (2) Disperse the titanium nitride material in the solution A according to the mass ratio of 30:1 to the final obtained lithium iron phosphate to obtain the titanium nitride dispersion solution B;

[0040] (3) Spray-dry the solution B in a mixed atmosphere of nitrogen and argon at 500°C to obtain a precursor powder;

[0041] (4) The precursor powder was heat-treated at 500° C. in a helium atmosphere and kept at a temperature of 900 minutes to obtain a lithium iron phosphate cathode material.

[0042] The resulting LiFePO 4 The material is used as the positive electrode material of lithium ion battery for electrochemical performance test, and the ratio of the pole piece is LiFePO 4 Material: Acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared with a lithium sh...

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Abstract

The invention relates to a lithium iron phosphate composite cathode material as well as a preparation method and application thereof. Through a spray drying way, an organic carbon source and highly conductive phase titanium nitride are introduced simultaneously so as to prepare the lithium iron phosphate composite cathode material, and the lithium iron phosphate composite cathode material with high conductivity, uniform particles, high vibration density and a multi-level structure is obtained. The preparation process is simple, batch production can be achieved, and the lithium iron phosphate composite cathode material has good application prospects.

Description

technical field [0001] The invention relates to the field of battery material preparation, in particular to a preparation method of lithium iron phosphate composite cathode material. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] Among them, olivine-type LiFePO 4 The positive electrode material has relatively high specific capacity (170mAh / g), stable working voltage (3-5V) and good cycle life, and its rich raw materials, good thermal and chemical stability, and environmental friendline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI