Lithium iron phosphate-based composite material with capacity higher than theoretical capacity of lithium iron phosphate, preparation method and use of lithium iron phosphate-based composite material

A composite material, lithium iron phosphate technology, applied in final product manufacturing, sustainable manufacturing/processing, electrolyte battery manufacturing, etc., can solve problems such as low surface electronic conductivity

Active Publication Date: 2018-11-02
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the above method still cannot solve the problem of low surface electronic conductivity.

Method used

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  • Lithium iron phosphate-based composite material with capacity higher than theoretical capacity of lithium iron phosphate, preparation method and use of lithium iron phosphate-based composite material
  • Lithium iron phosphate-based composite material with capacity higher than theoretical capacity of lithium iron phosphate, preparation method and use of lithium iron phosphate-based composite material
  • Lithium iron phosphate-based composite material with capacity higher than theoretical capacity of lithium iron phosphate, preparation method and use of lithium iron phosphate-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Add 1g of cetyltrimethylammonium bromide to 1L of deionized water and stir evenly, add 0.001mol carbon nanowires to the above solution at a stirring speed of 400r / min, and wait for the carbon nanowires to disperse evenly , add ferrous chloride, ammonium dihydrogen phosphate successively wherein according to the ratio of molar ratio Fe:P=1:1.03, make the overall molar concentration of final solution with Fe 2+ Calculated as 0.1mol / L.

[0084] (2) Stir the obtained solution evenly, and add ammonia solution to it under stirring condition until the pH of the solution is about 7. The obtained solution was transferred into a reaction kettle, and reacted in a sealed manner at 100° C. for 24 hours, and the obtained precipitate was filtered, washed and dried to obtain a composite precursor material.

[0085] (3) Lithium carbonate, composite precursor material, and ammonium dihydrogen phosphate are sequentially added to the mixer at a molar ratio Li:Fe:P=3:3:1 and mixed and ...

Embodiment 2

[0095] (1) Add 2g polyvinyl alcohol to 1L deionized water and stir evenly, add 0.005mol carbon nanotubes to the above solution at a stirring speed of 400r / min, after the carbon nanotubes are uniformly dispersed, the molar ratio of Fe: The ratio of P=1:1.01 adds ferrous oxalate and diammonium hydrogen phosphate to it successively, so that the overall molar concentration of the final solution is expressed as Fe 2+ Calculated as 0.2mol / L.

[0096] (2) Stir the obtained solution evenly, and add ammonia solution to it under stirring conditions until the pH of the solution is about 7; transfer the obtained solution into a reaction kettle, and react in a sealed manner at 180° C. for 18 hours; filter the obtained precipitate, wash, Dry to obtain a composite precursor material.

[0097] (3) According to the molar ratio Li:Fe:P=3.15:3:1.03, add lithium acetate, composite precursor material, and diammonium hydrogen phosphate to the mixer in sequence and mix and stir for 4 hours, and put...

Embodiment 3

[0102] (1) Add 5g polyethylene glycol to 1L deionized water and stir evenly, add 0.04mol graphene to the above solution at a stirring speed of 400r / min, after the carbon nanowires are uniformly dispersed, the molar ratio of Fe: The ratio of P=1:1.02 adds ferrous sulfate, ammonium phosphate to it successively, makes the integral molar concentration of final solution to be Fe 2+ Calculated as 0.5mol / L.

[0103] (2) Stir the obtained solution evenly, and slowly add ammonia solution to it under stirring condition until the pH of the solution is about 4. The obtained solution was transferred into a reaction kettle, and the closed reaction was carried out at 150° C. for 20 h, and the obtained precipitate was filtered, washed and dried to obtain a composite precursor material.

[0104] (3) According to the molar ratio Li:Fe:P=3.13:3:1, add lithium chloride, composite precursor material, and phosphoric acid to the mixer in sequence and mix and stir for 6 hours, and place the resultin...

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Abstract

The invention discloses a lithium iron phosphate-based composite material with capacity higher than theoretical capacity of lithium iron phosphate, a preparation method and a use of the lithium iron phosphate-based composite material. The lithium iron phosphate-based composite material comprises an inner core and a composite coating layer for wrapping the inner core; the inner core is composed ofan inorganic carbon substrate and lithium iron phosphate attached to the inorganic carbon substrate; the composite coating layer comprises trivanadium heptoxide monohydrate particles and inorganic carbon. The method comprises the following steps of 1) preparing a composite precursor which is composed of the inorganic carbon substrate and ferrous phosphate attached on the inorganic carbon substrate; 2 ) performing mixing on the composite precursor and a lithium source and a phosphorus source, and carrying out roasting to obtain the inner core; 3 ) performing mixing on the inner core, a vanadiumsource, a soluble organic carbon source, a surfactant and a solvent to obtain a slurry, and carrying out hydrothermal reaction to obtain the lithium iron phosphate-based composite material. The lithium iron phosphate-based composite material disclosed by the invention is high in tap density, the buckling capacity can reach 170mAh/ g or above, and the rate performance is high.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery positive electrode materials, and relates to a lithium-ion battery positive electrode material with good electrochemical performance and high compaction density, its preparation method and application, in particular to a lithium iron phosphate exceeding the theoretical capacity of lithium iron phosphate Matrix composite material, its preparation method and its use as positive electrode material in lithium ion battery. Background technique [0002] As the latest generation of power batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge, no memory effect and low pollution, which basically meet the basic needs of portable devices and energy vehicles. One of the key components of lithium-ion batteries is the positive electrode material. The commercialized positive electrode materials include lithium cobalt oxide, lithium manganese oxide, tern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/485H01M4/62H01M4/13H01M10/0525H01M10/058
CPCH01M4/13H01M4/366H01M4/485H01M4/5825H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 杨帆王张健杨顺毅吴小珍
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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