Nickel oxide/graphite composite nanomaterial used for lithium ion battery, and preparation method and application thereof

A technology of composite nanomaterials and lithium-ion batteries, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of easy aggregation of nanomaterials, achieve volume expansion relief, simple preparation process, and increased reaction contact area big effect

Inactive Publication Date: 2017-07-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the biggest problem with nanomaterials is that they are easy to agglomerate and cause more problems, and adding carbon black or conductive polymers can improve these problems

Method used

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  • Nickel oxide/graphite composite nanomaterial used for lithium ion battery, and preparation method and application thereof
  • Nickel oxide/graphite composite nanomaterial used for lithium ion battery, and preparation method and application thereof
  • Nickel oxide/graphite composite nanomaterial used for lithium ion battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 30g of natural flake graphite successively, put 15g of anhydrous sodium nitrate into a 100ml beaker, add 60ml of concentrated nitric acid dropwise under magnetic stirring, wash with distilled water after stirring for 12 hours until the pH is neutral, and dry to obtain acidified graphite. Weigh successively 0.3596g of acidified graphite, 8.9904g of nickel hydroxide, and 187g of zirconium balls (grinding medium), add in the ball mill jar, add sealing ring, ball mill at 400rpm for 48h, filter out the zirconium balls through a sieve to obtain the sample obtained Nickel hydroxide / graphite composite nanomaterials. The obtained material was placed in a tube furnace, and in a nitrogen atmosphere, the temperature was raised to 350° C. at a rate of 5° C. per minute, and kept for 2 hours to obtain a nickel oxide / graphite composite nanomaterial.

[0038] Weigh 0.2g of nickel oxide / graphite composite nanomaterials, 0.025g of carbon black, and 0.025g of PVDF, grind them thoroug...

Embodiment 2

[0040]Weigh 30g of natural flake graphite successively, put 15g of anhydrous sodium nitrate into a 100ml beaker, add 60ml of concentrated nitric acid dropwise under magnetic stirring, wash with distilled water after stirring for 12 hours until the pH is neutral, and dry to obtain acidified graphite. Weigh successively 0.7670g acidified graphite, 8.5826g nickel hydroxide, 187g zirconium balls (grinding medium), add in the ball mill pot, add sealing ring, ball mill 48h under 400rpm, the sample that obtains is filtered out zirconium balls through sieve, obtains Nickel hydroxide / graphite composite nanomaterials. The obtained material was placed in a tube furnace, and in a nitrogen atmosphere, the temperature was raised to 350° C. at a rate of 5° C. per minute, and kept for 2 hours to obtain a nickel oxide / graphite composite nanomaterial.

[0041] Weigh 0.2g of nickel oxide / graphite composite nanomaterials, 0.025g of carbon black, and 0.025g of PVDF, grind them thoroughly in a mort...

Embodiment 3

[0043] Weigh 30g of natural flake graphite successively, put 15g of anhydrous sodium nitrate into a 100ml beaker, add 60ml of concentrated nitric acid dropwise under magnetic stirring, wash with distilled water after stirring for 12 hours until the pH is neutral, and dry to obtain acidified graphite. Take by weighing 1.5677g acidified graphite, 7.7819g nickel hydroxide, 187g zirconium balls (grinding medium), add in the ball mill pot, add sealing ring, ball mill 48h under 400rpm, the obtained sample is filtered out the zirconium balls through a sieve to obtain Nickel hydroxide / graphite composite nanomaterials. The obtained material was placed in a tube furnace, and in a nitrogen atmosphere, the temperature was raised to 350° C. at a rate of 5° C. per minute, and kept for 2 hours to obtain a nickel oxide / graphite composite nanomaterial.

[0044] Weigh 0.2g of nickel oxide / graphite composite nanomaterials, 0.025g of carbon black, and 0.025g of PVDF, grind them thoroughly in a mo...

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Abstract

The invention discloses a nickel oxide / graphite composite nanomaterial used for a lithium ion battery, and a preparation method and an application thereof, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: mixing and stirring graphite, anhydrous sodium nitrate and concentrated nitric acid, washing the obtained mixture, and drying the mixture to obtain acidified graphite; and carrying out ball milling on the acidified graphite and nickel hydroxide, and calcining the obtained material to obtain the nickel oxide / graphite composite nanomaterial. When the nickel oxide / graphite composite nanomaterial is used in a lithium ion battery negative electrode, the nanomaterial has good electrochemical performances, the reversible capacity still keeps 861 mAh g<-1> after 50 cycles at a current density of 200 mA g<-1>, and the reversible capacity still keeps 602 mAh g<-1> or above at a large current density (1200 mAh g<-1>).

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a nickel oxide / graphite composite nanomaterial used in lithium-ion batteries and its preparation method and application. Background technique [0002] With the emergence of energy crisis and increasingly severe environmental problems, there is an urgent need for a new type of energy to replace non-renewable energy such as coal and oil. Rechargeable lithium-ion batteries can be used as energy storage carriers for green energy, which has attracted great attention. Theoretical capacity of commercial Li-ion battery anode material graphite (372mAh g -1 ) is low, which is not enough to meet the growing energy demand, so looking for lithium-ion battery anode materials with the advantages of low price, long cycle life, high energy density, high reversible capacity, excellent rate performance and cycle stability appears to be particularly important. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/362H01M4/52H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 张震刘亚萌
Owner SOUTH CHINA UNIV OF TECH
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