A modifier and its preparation method and use

A modifier and hexagonal phase technology, applied in the field of modifier and its preparation, can solve the problems of limited application, high cost, and graphene is not easy to disperse, and achieve the effect of good interface effect and ensuring continuity and uniformity.

Active Publication Date: 2021-07-16
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simply using nitrogen-doped graphene for surface coating has high cost, graphene is not easy to disperse, and it is difficult to achieve uniform coating, which leads to unsatisfactory coating effect, reduces the volume specific energy of the product, and ultimately affects the battery life of lithium iron phosphate. The problem of chemical properties, which limits its application in electrode material coating

Method used

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  • A modifier and its preparation method and use

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] According to a certain ratio of Li 1.81 h 0.19 Ti 2 o 5 ·H 2 O and hexagonal phase tungsten oxide nanowires were added to the aqueous dispersion of graphene (concentration 1.2mg / mL), so that graphene, Li 1.81 h 0.19 Ti 2 o 5 ·H 2 The mass percentage of O and hexagonal tungsten oxide nanowires is 95%:3%:2%, stirred at a rate of 300r / min for 5h, then ultrasonically treated for 1h, and the ultrasonic power is 500W; the solution after ultrasonic treatment was vacuum-dried at 90°C ; heat-treat the dried product at 700° C. for 0.5 h in an ammonia atmosphere, wherein the flow rate of ammonia gas is 10 sccm, and the product after heat treatment is a positive electrode material modifier.

Embodiment 2

[0058] According to a certain ratio of Li 1.81 h 0.19 Ti 2 o 5 ·3H 2 O and hexagonal phase tungsten oxide nanorods were added to the aqueous dispersion of graphene (concentration 2mg / mL), so that graphene, Li 1.81 h 0.19 Ti 2 o 5 ·3H 2 The mass percentage of O and hexagonal phase tungsten oxide nanorods is 60%:30%:10%, stirred at a rate of 600r / min for 1h, then ultrasonically treated for 4h, and the ultrasonic power is 200W; the solution after ultrasonic treatment was vacuumized at 60°C Drying: heat-treat the dried product at 300° C. for 5 hours in an ammonia gas atmosphere, wherein the flow rate of ammonia gas is 500 sccm, and the product after heat treatment is a positive electrode material modifier.

Embodiment 3

[0060] According to a certain ratio, the phase structure contains H at the same time 2 Ti 3 o 7 , Li 4 Ti 5 o 12 and TiO 2 The compound and hexagonal phase tungsten oxide nanoparticles are added to the graphene water dispersion (concentration 1.5mg / mL), so that the graphene and the phase structure simultaneously contain H 2 Ti 3 o 7 , Li 4 Ti 5 o 12 and TiO 2 The compound, the mass percentage of hexagonal tungsten oxide nanoparticles is 70%: 25%: 5%, stirred at a rate of 1000r / min for 3h, then ultrasonically treated for 3h, with ultrasonic power of 400W, and the solution after ultrasonic treatment was heated at 80°C Vacuum drying; the dried product was heat-treated at 500° C. for 3 hours in an ammonia atmosphere, wherein the flow rate of ammonia gas was 400 sccm, and the product after heat treatment was a positive electrode material modifier.

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Abstract

The invention provides a modifying agent and its preparation method and application. The modifying agent includes nitrogen-doped graphene, hydrogen-containing lithium titanium oxide compound and hexagonal phase tungsten oxide, wherein the hydrogen-containing lithium titanium oxide Both compound and hexagonal tungsten oxide are nitrogen-doped materials. The preparation method of the modifier comprises the following steps: 1) adding hydrogen-containing lithium titanyl oxide compound and hexagonal phase tungsten oxide to the graphene dispersion liquid, ultrasonicating, and then drying; 2) adopting chemical vapor deposition method to form Nitrogen source, the dry product obtained in step 1) is heat-treated to obtain a modifier. The modifier provided by the present invention can be used to modify lithium ion battery electrode materials, and can greatly improve the electronic conductivity, ion conductivity, discharge specific capacity, cycle stability and service life of lithium ion battery electrode materials. The field of lithium-ion batteries has broad application prospects.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode material preparation technology and lithium-ion batteries, and relates to a modifier, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large discharge specific capacity, high voltage platform, safety, long life, and environmental friendliness. At present, they are widely used in various fields such as small portable batteries, power batteries for new energy vehicles, and energy storage. With the improvement of people's living standards, people put forward higher requirements for lithium-ion batteries, requiring higher energy density, higher rate performance, longer cycle life, higher safety and electrochemical stability. In order to achieve the above purpose, people use various methods to modify the cathode material of lithium ion battery. [0003] Under certain conditions such as low temperature, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 谭强强徐宇兴
Owner LANGFANG GREEN IND TECH CENT
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