A processing method for lithium metal phosphate material and lithium metal phosphate material obtained by the method

A processing method and metal lithium technology, applied in the field of lithium-ion batteries, can solve the problems of large specific surface area, poor electronic and ionic conductivity, and increased water absorption, and achieve the effect of reducing specific surface area.

Active Publication Date: 2017-09-05
GUIZHOU ANDA TECH ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of its own structure, compared with traditional lithium cobaltate, lithium manganate, and three-element materials, its electronic conductivity and ionic conductivity are relatively poor. Therefore, in practical applications, in addition to carbon coating treatment In addition, it is generally necessary to nano-process lithium metal phosphate materials to make up for the lack of electrical conductivity by shortening the electron and ion transport paths.
However, the nanonization of materials will bring disadvantages in application, among which the large increase in specific surface area will make lithium metal phosphate materials particularly easy to absorb water, and more binders are needed to ensure the active material in the coating of battery pole pieces. Bonding force with current collector
Therefore, reducing the specific surface area of ​​lithium metal phosphate materials and solving the problem of increased water absorption caused by the large specific surface area of ​​lithium metal phosphate materials are problems that need to be solved urgently in the application of lithium metal phosphate materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment is used to illustrate the processing method of the lithium metal phosphate material of the present invention.

[0041] 100g LiFePO 4 The heat treatment is carried out in a tubular atmosphere furnace. The heat treatment conditions include: treatment at a constant temperature of 750°C for 5 hours, an atmosphere of 99.99% carbon dioxide, and a gas flow rate of 6L / min to obtain sample A, and use sample A to make CR2025 button batteries.

[0042] After measurement, the carbon content of the obtained sample A is 1.02% by weight; the specific surface area is 10.7m 2 / g; Under 23℃, 45% relative humidity (constant temperature and humidity box) within 7 hours, the water absorption reaches saturation, and the saturated water absorption is 1835ppm; the manufactured CR2025 button battery is charged and discharged at a rate of 0.1C, the first discharge gram specific capacity It is 159.6mAh / g.

Embodiment 2

[0044] This embodiment is used to illustrate the processing method of the lithium metal phosphate material of the present invention.

[0045] 100g LiMnPO 4 Heat treatment in a tubular atmosphere furnace. The heat treatment conditions include: treatment at a constant temperature of 720°C for 2 hours, an atmosphere of 99.99% sulfur trioxide (using 60°C hot nitrogen as the carrier gas), and a gas flow of 4L / min to obtain sample B , And use sample B to make CR2025 button battery.

[0046] After measurement, the carbon content of the obtained sample B is 2.16% by weight; the specific surface area is 16.5m 2 / g; Under 23℃, 45% relative humidity (constant temperature and humidity box), the water absorption reaches saturation within 1 hour, and the saturated water absorption is 5945ppm; the finished CR2025 button battery has a charge-discharge rate of 0.1C, its first discharge gram ratio The capacity is 110.8mAh / g.

Embodiment 3

[0048] This embodiment is used to illustrate the processing method of the lithium metal phosphate material of the present invention.

[0049] Put 100g LiNiPO 4 The heat treatment is carried out in a tubular atmosphere furnace, and the heat treatment conditions include: treatment at a constant temperature of 700° C. for 10 hours, an atmosphere of 99.99% carbon dioxide, and a gas flow rate of 10 L / min to obtain sample C, and use sample C to make CR2025 button batteries.

[0050] After measurement, the carbon content of the obtained sample C is 2.33% by weight; the specific surface area is 18.2m 2 / g; At 23℃ and 45% relative humidity (constant temperature and humidity box), the water absorption reaches saturation within 55 minutes, and the saturated water absorption is 6521ppm; the manufactured CR2025 button battery has a charge-discharge rate of 0.1C, and its first discharge gram ratio The capacity is 114.1mAh / g.

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Abstract

The invention relates to the field of lithium ions and discloses a treatment method of a metal lithium phosphate material and the metal lithium phosphate material prepared by the same. The treatment method includes: performing heat treatment on the metal lithium phosphate material in weak oxidization atmosphere. By adopting the method to treat the metal lithium phosphate material, electrochemical performance like first discharge comparable capacity of the method can be deteriorated hardly, but specific surface area, saturated water absorbing capacity and water absorbing speed of the material can be lowered obviously.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a method for processing lithium metal phosphate materials and lithium metal phosphate materials obtained by the method. Background technique [0002] Lithium metal phosphate materials (such as lithium iron phosphate materials) are currently one of the mainstream materials in the cathode material market for lithium-ion batteries at home and abroad. Because of their excellent safety performance and cycle performance, they are currently the preferred material for power batteries for electric vehicles . However, due to the characteristics of its own structure, compared with traditional lithium cobalt oxide, lithium manganate, and three-element materials, its electronic conductivity and ionic conductivity are relatively poor, so in practical applications, in addition to carbon coating treatment In addition, it is generally necessary to nano-process the lithium metal phosphate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 夏冬炎先雪峰陈明季勇
Owner GUIZHOU ANDA TECH ENERGY CO LTD
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