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Carbon-coated lithium iron phosphate material, preparation method and lithium ion battery cathode material

A carbon-coated technology for lithium iron phosphate and lithium carbonate, which can be used in battery electrodes, phosphates, phosphorus oxyacids, etc., and can solve problems such as potential safety hazards and increased costs.

Inactive Publication Date: 2019-12-20
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many preparation methods for lithium iron phosphate, except for the industrial application of high-temperature solid-state reaction method, most of them are in the laboratory research stage.
However, the current high-temperature solid-phase method requires additional reducing gas protection, for example: CN200610137221.9 adopts non-oxidizing gas for protection, but the non-oxidizing gas will increase the cost and bring safety hazards

Method used

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  • Carbon-coated lithium iron phosphate material, preparation method and lithium ion battery cathode material
  • Carbon-coated lithium iron phosphate material, preparation method and lithium ion battery cathode material
  • Carbon-coated lithium iron phosphate material, preparation method and lithium ion battery cathode material

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preparation example Construction

[0043] A method for preparing a carbon-coated lithium iron phosphate material, the method comprising:

[0044] Add lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate dihydrate, and sucrose into a ball mill tank, then add absolute ethanol, seal it, put it into a ball mill for ball milling, the speed of the ball mill is 220-260r / min, and ball mill for 12-24h to obtain slurry a;

[0045] Filter the slurry a, and then dry the filtered slurry in an oven at a drying temperature of 60-80°C for 12-24 hours to obtain a block product b;

[0046] Grinding the bulk product b to obtain a white powder c, which is the precursor of the coated lithium iron phosphate material;

[0047] Transfer the white powder c to the first crucible, smooth the surface, and compact it. The compaction effect needs to reach the first crucible upside down, and gently shake the first crucible, and the compacted powder inside the first crucible does not scatter out Then cover the first crucible, e...

specific Embodiment 1

[0057] A method for preparing a carbon-coated lithium iron phosphate material, the method comprising:

[0058] Add lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate dihydrate, and sucrose into a ball mill tank, then add absolute ethanol, seal it, put it into a ball mill for ball milling, the ball mill speed is 260r / min, and ball mill for 12 hours to obtain slurry a;

[0059] Filter the slurry a, and then dry the filtered slurry in an oven at a drying temperature of 60°C for 24 hours to obtain a block product b;

[0060] Grinding the bulk product b to obtain a white powder c, which is the precursor of the coated lithium iron phosphate material;

[0061] Transfer the white powder c to the first crucible, compact it, and then cover the first crucible lid, exhaust the air and seal the mouth of the crucible with copper wire bundled with aluminum foil, turn it upside down into the second crucible, and fill the second crucible for reduction Fill up and compact the po...

specific Embodiment 2

[0069] A method for preparing a carbon-coated lithium iron phosphate material, the method comprising:

[0070] Add lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate dihydrate, and sucrose into a ball mill tank, then add absolute ethanol, seal it, put it into a ball mill for ball milling, the ball mill speed is 220r / min, and ball mill for 24 hours to obtain slurry a;

[0071] Filter the slurry a, and then dry the filtered slurry in an oven at a drying temperature of 80°C for 12 hours to obtain a block product b;

[0072] Grinding the bulk product b to obtain a white powder c, which is the precursor of the coated lithium iron phosphate material;

[0073] Transfer the white powder c to the first crucible, compact it, and then cover the first crucible lid, exhaust the air and seal the mouth of the crucible with copper wire bundled with aluminum foil, turn it upside down into the second crucible, and fill the second crucible for reduction Fill up and compact the po...

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Abstract

The invention discloses a carbon-coated lithium iron phosphate material, a preparation method and a lithium ion battery cathode material. The method includes: adding lithium carbonate, ferrous oxalate, ammonium dihydrogen dihydrate dihydrate, and sucrose into a ball milling tank, and adding absolute ethyl alcohol, sealing the ball milling tank and ball milling the mixture in a ball mill to obtainpaste a; filtering the paste a, drying the filtered paste to obtain a block product b; grinding the block product b to obtain a white powder c; transferring the white powder c to a first crucible, exhausting the air, sealing the crucible mouth with aluminum foil, inverting the first crucible in a second crucible, and filling the second crucible with a reducing powder; heating the first crucible and the second crucible in a muffle furnace for a period of time to obtain the carbon-coated lithium iron phosphate material in the first crucible. The method eliminates the need for a reducing gas or inert gas like a traditional high-temperature solid-phase method, and only needs to add the reducing powder, thereby greatly reducing the cost and improves the safety of the entire process.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon-coated lithium iron phosphate material, a preparation method and a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries with high output voltage, high energy density, small self-discharge, no memory effect, good cycle performance, wide operating temperature range, and environmental friendliness have been widely used in portable electronic products and consumer electronic products , and with the development of electric vehicles in recent years, its technology has developed rapidly. [0003] The selection and processing technology of cathode materials for lithium-ion batteries is an important part of lithium-ion battery production technology. The application fields of lithium iron phosphate batteries generally include: energy storage equipment, electric tools, light electric vehicles, large electric vehicl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/36H01M4/583H01M4/62H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCH01M4/667H01M4/366H01M4/583H01M4/625H01M4/5825H01M10/0525C01B25/26C01B25/45C01B25/375Y02E60/10
Inventor 张黎曹政张浩楠姚玉勇
Owner 桑顿新能源科技(长沙)有限公司