Anode material and cathode material for lithium ion battery and modifying method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity of lithium iron phosphate, and achieve the effects of simplifying the manufacturing process, simplifying the manufacturing process, and improving performance.

Active Publication Date: 2011-02-09
GUANGDONG DONGDAO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For positive electrode materials, there are also some problems. For example, lithium cobalt oxide has safety problems when it is applied to power batteries; lithium iron phosphate has poor conductivity.

Method used

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  • Anode material and cathode material for lithium ion battery and modifying method thereof
  • Anode material and cathode material for lithium ion battery and modifying method thereof
  • Anode material and cathode material for lithium ion battery and modifying method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, 0.3 gram of ferrocene and 300 gram of natural spherical graphite were mixed with a planetary ball mill to make them evenly mixed. Put the mixture of ferrocene and natural spherical graphite into a graphite crucible, place it in a tube furnace, and pass it with a mixed gas of acetylene and nitrogen, the volume ratio of which is 0.1:1. Heating at a heating rate of 0.2° C. / min to 900° C. and keeping it warm for 1 hour. After the reaction was completed, the sample after the reaction was tested with a scanning electron microscope. Mix the mixture of catalyst, graphite and carbon nanotubes with the mixed acid of concentrated sulfuric acid and concentrated nitric acid at a mass ratio of 1:1, slowly add water and stir until the slurry becomes a paste, then move it into the reactor at 5°C / min The heating rate was heated to 400°C and reacted for 1 hour, and stirred every 1 hour during the reaction, and the interval was 5 minutes. Afterwards, the slurry is moved into a...

Embodiment 2

[0032] Embodiment 2, 0.6 grams of ferrocene and 300 grams of natural spherical graphite are mixed with a roller ball mill to make them evenly mixed. Put the mixture of ferrocene and natural spherical graphite into a graphite crucible, place it in a tube furnace, and pass it with a mixed gas of xylene and argon with a volume ratio of 3:1. Heating at a heating rate of 2°C / min to 800°C for 20 hours. After the reaction was completed, the sample after the reaction was tested with a scanning electron microscope. Mix the mixture of catalyst, graphite and carbon nanotubes with the mixed acid of concentrated hydrochloric acid and hydrofluoric acid at a mass ratio of 1:50, slowly add water and stir, and move the slurry into the reactor after it becomes a paste, and heat it at 5°C / The heating rate of 1 minute is heated to 300° C. for 5 hours, and the reaction is stirred once every 1 hour during the reaction, and the interval time is 5 minutes. Afterwards, the slurry is moved into a cen...

Embodiment 3

[0034] Embodiment 3, 15 grams of nickel foam and 300 grams of artificial spherical graphite are mixed with a roller ball mill to make them evenly mixed. Put the mixture of foamed nickel and artificial spherical graphite into a graphite crucible, place it in a tube furnace, and pass it with a mixed gas of acetylene and nitrogen, the volume ratio of which is 10:1. Heat at a heating rate of 10°C / min to 400°C and keep warm for 72 hours. After the reaction is completed, use a scanning electron microscope to test the sample after the reaction. Mix the mixture of catalyst, graphite and nano-carbon fiber with concentrated hydrochloric acid and hydrofluoric acid. The acid is mixed according to the mass ratio of 1:50, slowly add water and stir, and after the slurry becomes a paste, move it into the reactor and heat it to 50°C at a heating rate of 5°C / min to react for 20 hours. Stir every 1 hour for 5 minutes. Afterwards, the slurry is moved into a centrifugal washing device, and contin...

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Abstract

The invention discloses an anode material and a cathode material for a lithium ion battery and a modifying method thereof, solving the technical problem, i.e. how to improve the electrochemical performance of an electrode material. The surface of either anode material or the cathode material for the lithium ion battery is coated with a layer of carbon nanotubes or carbon nanofibers in a net structure, the coating layer of the cathode material has the thickness of 1-400 nm, and the coating amount of the anode material is 0.5-5 percent of the electrode material. The modifying method of the anode material and the cathode material for the lithium ion battery comprises the following steps of: forming a mixture of the electrode material, a catalyst and the carbon nanotubes or carbon nanofibers;adding water to stir the mixture into mash; and heating and reacting. Compared with the prior art, by coating a layer of carbon nanotubes or carbon nanofibers on the surface, the invention improves the material performance in all aspects and the electrochemical performance of the electrode material, achieves the aim of avoiding adding an additional conductive agent when applying the material and simplifies the manufacture process of the pole pieces of the lithium ion battery.

Description

technical field [0001] The invention relates to a battery material and a modification method thereof, in particular to a lithium ion battery material and a modification method thereof. Background technique [0002] Today, lithium-ion batteries have been widely used in digital products, lamps, mobile power supplies and various electronic devices. With the continuous advancement of technology, digital products and electronic equipment are gradually developing towards miniaturization and personalization, which requires batteries to have smaller volume and higher specific energy output, that is, higher energy density. In addition, in terms of transportation, due to the exhaust gas pollution and serious noise pollution of oil-using vehicles, and the problem of energy depletion, electric vehicles and electric bicycles have become effective substitutes. They do not use oil and are pollution-free. Many countries in the world have invested huge manpower and material resources in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 吴其修张万红
Owner GUANGDONG DONGDAO NEW ENERGY
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