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Lithium iron phosphate positive electrode material as well as preparation method and application thereof

A technology of lithium iron phosphate and positive electrode material, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of reducing gram capacity and affecting the purity of lithium iron phosphate

Inactive Publication Date: 2021-09-10
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this document, soluble carbon source glucose is used for carbon coating, which will inevitably introduce impurities and affect the purity of lithium iron phosphate. The most direct drawback is that the gram capacity is reduced.

Method used

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  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof
  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof
  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a preparation method of lithium iron phosphate cathode material, the preparation method is as follows:

[0046] (1) Put 200g of lithium iron phosphate substrate S1 in a rotary tube furnace, then feed nitrogen into the furnace body, raise the temperature of the sintering furnace to 700°C once, and keep the temperature constant;

[0047] (2) Pass 160g of methane into the sintering furnace at a pressure of 0.4MPa and a speed of 600mL / min until all the required methane is passed through, switch to nitrogen and continue to pass into the furnace body, so that the furnace body continues to heat up to 800°C, Insulate for 10 hours, cool to room temperature, take out the cooled lithium iron phosphate S2, and air crush to obtain the lithium iron phosphate positive electrode material.

Embodiment 2

[0049] This embodiment provides a preparation method of lithium iron phosphate cathode material, the preparation method is as follows:

[0050] (1) Put 200g of lithium iron phosphate substrate S1 in a rotary tube furnace, then pass argon gas into the furnace body, raise the temperature of the sintering furnace to 650°C once, and keep the temperature constant;

[0051] (2) Pass 80g of ethane into the sintering furnace with a pressure of 0.1MPa and a speed of 200mL / min until the required ethane is completely passed through, switch to argon and continue to pass into the furnace body, so that the furnace body continues to heat up to 700°C, heat preservation for 1 hour, cooling to room temperature, taking out the cooled lithium iron phosphate S2, and air crushing to obtain the lithium iron phosphate positive electrode material.

Embodiment 3

[0053] This embodiment provides a preparation method of lithium iron phosphate cathode material, the preparation method is as follows:

[0054] (1) Put 200g of lithium iron phosphate substrate S1 in a rotary tube furnace, then feed nitrogen into the furnace body, raise the temperature of the sintering furnace to 600°C once, and keep the temperature constant;

[0055] (2) Pass 100g of natural gas into the sintering furnace at a pressure of 0.2MPa and a speed of 300mL / min until all the required natural gas is passed through, switch to nitrogen and continue to pass into the furnace body, so that the temperature of the furnace body continues to rise to 750°C, Insulate for 5 hours, cool to room temperature, take out the cooled lithium iron phosphate S2, and obtain the lithium iron phosphate positive electrode material after air crushing.

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Abstract

The invention provides a lithium iron phosphate positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) putting a lithium iron phosphate matrix into a sintering furnace, and carrying out primary heating in a protective atmosphere; and (2) introducing a gas carbon source, and then carrying out secondary heating and sintering in a protective atmosphere to obtain the lithium iron phosphate positive electrode material. The gas carbon source is used as a carbon coating agent, and gradient temperature sintering is adopted, so that the uniformity of coated carbon is improved, the thickness of a carbon coating layer is reduced, the crystallinity of the positive electrode material is also improved, and finally, the conductivity of the lithium iron phosphate positive electrode material is improved, the ion transmission impedance of the lithium iron phosphate positive electrode material is reduced, and the purpose of improving the rate capability of the material is further achieved. In addition, the gas carbon source is adopted, so that impurities are not introduced, the carbon coating amount is reduced, and the gram volume and the processability of the lithium iron phosphate positive electrode material can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium iron phosphate cathode material and a preparation method and application thereof. Background technique [0002] Lithium iron phosphate material is considered to be one of the most promising cathode materials for lithium-ion batteries because of its low cost, easy availability, environmental protection and excellent electrochemical performance. However, due to its low conductivity and slow diffusion rate of lithium ions, it has been restricting its further development. The use of carbon coating is one of the simple and effective methods to improve the electronic conductivity of lithium iron phosphate materials. However, the use of carbon coating will reduce the proportion of lithium iron phosphate phase correspondingly, and the capacity of carbon coating will decrease relatively. The layer is loose and porous, with a large specific surface area, and the exce...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 段敏冯晓杰闫龙梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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