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Composite anode material for lithium ion battery, and preparation method and application of composite anode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of high average voltage, low compaction density, and low energy density.

Active Publication Date: 2016-01-20
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN103325997A, CN103329320A, and CN102428595A all disclose low-temperature carbonized coke-like carbon materials as negative electrode materials and their preparation methods, but the capacity and first effect are relatively low
CN102428594A discloses a coke-like carbon material co-doped with phosphorus and boron and its preparation method. Although the capacity of coke-like soft carbon is improved, it is only used as a power battery negative electrode material because of its high average voltage and low compaction density. , resulting in a lower energy density
CN103378357A discloses a rechargeable lithium battery negative electrode composition containing soft carbon and graphite, but does not mention the preparation method of soft carbon and graphite composite

Method used

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  • Composite anode material for lithium ion battery, and preparation method and application of composite anode material
  • Composite anode material for lithium ion battery, and preparation method and application of composite anode material
  • Composite anode material for lithium ion battery, and preparation method and application of composite anode material

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Effect test

Embodiment 1

[0088] Petroleum-based green coke raw materials are obtained by jet milling and cyclone classification to obtain particle size D 50 = 8.0-10.0 micron green coke powder, mix the green coke powder and ammonium dihydrogen phosphate at a mass ratio of 97:3 with a VC mixer at a speed of 100r / min, and mix for 30min to obtain a mixture; put the above mixture in In the atmosphere furnace, the nitrogen flow rate is 120L / h, the temperature is raised to 950°C at a heating rate of 5°C / min, and the temperature is kept for 3h to obtain a phosphorus-doped coke-like soft carbon sample; the phosphorus-doped coke-like soft carbon is mixed with D 50 The artificial graphite of =12 microns is 50:50 according to mass ratio, mixes with VC mixer, rotating speed 100r / min, mixes 30min, the mixture obtained and phenolic resin are dispersed in ethanol solvent according to mass ratio 90:10, stir evenly, After heating and drying in a water bath, the mixture was placed in an atmosphere furnace with a nitrog...

Embodiment 2

[0096] Petroleum-based green coke raw materials are obtained by jet milling and cyclone classification to obtain particle size D 50 = 9.0-15.0 micron green coke powder, mix the green coke powder and ammonium dihydrogen phosphate at a mass ratio of 95:5 with a VC mixer at a speed of 100r / min, and mix for 30min to obtain a mixture; put the above mixture in In the atmosphere furnace, the nitrogen flow rate is 120L / h, the temperature is raised to 950°C at a heating rate of 5°C / min, and the temperature is kept for 3h to obtain a phosphorus-doped coke-like soft carbon sample; the phosphorus-doped coke-like soft carbon is mixed with D 50 The natural graphite of =12 microns is 50:50 according to mass ratio, mixes with VC mixer, rotating speed 100r / min, mixes 30min, the mixture obtained and epoxy resin are dispersed in Virahol solvent according to mass ratio of 80:20, Stir evenly, heat and dry the mixture in an oil bath, place the mixture in an atmosphere furnace with a nitrogen flow r...

Embodiment 3

[0098] Petroleum-based green coke raw materials are obtained by jet milling and cyclone classification to obtain particle size D 50 = 9.0-15.0 micron green coke powder, mix the green coke powder and ammonium dihydrogen phosphate at a mass ratio of 90:10 with a VC mixer at a speed of 100r / min, and mix for 30min to obtain a mixture; put the above mixture in In the atmosphere furnace, the nitrogen flow rate is 120L / h, the temperature is raised to 800°C at a heating rate of 5°C / min, and the temperature is kept for 3h to obtain a phosphorus-doped coke-like soft carbon sample; the phosphorus-doped coke-like soft carbon is mixed with D 50 The artificial graphite of =12 microns is 50:50 according to mass ratio, mixes with VC mixer, rotating speed 100r / min, mixes 30min, the mixture obtained and citric acid are dispersed in ethanol solvent according to mass ratio of 60:40, stir evenly, After spray drying, the mixture was placed in an atmosphere furnace with a nitrogen flow rate of 120L / ...

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Abstract

The invention relates to a composite anode material for a lithium ion battery, and a preparation method and application of the composite anode material. By heteroatom doping, the capacity of charred soft carbon is enhanced; and meanwhile, a carbon / carbon composite anode material is prepared by combining the charred soft carbon and a graphite material with mass ratio of (90-40):(10-60) and coating an organic matter pyrolytic carbon layer through combining the advantages of high rate capability and excellent cycle performance of the charred soft carbon and high initial efficiency of the graphite material and a simple, cheap and environment-friendly process line. The grain size D50 of the anode material is equal to 6.0 to 20.0 micrometers, the specific surface area is 1.0 to 5.0 square meters per gram, the compaction density is 1.0 to 1.5 grams per cubic meter, the initial coulombic efficiency is increased to over 85%, the capacity retention ratio after circulation of 500 times is greater than 90%, the rate capability is enhanced, the capacity retention ratio at 30C / 1C is greater than 95%, and the composite anode material can be applied to the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and relates to a composite negative electrode material for lithium ion batteries, a preparation method and its application. Specifically, the invention relates to a coke-like soft carbon composite negative electrode material, a preparation method and its application. Background technique [0002] Under the tremendous pressure of energy and environmental issues, the automotive industry has been looking for clean energy and alternative energy for a long time. In recent years, among the various technical routes of new energy vehicles, "vehicle electric technology" has come to the fore, among which lithium-ion batteries have become one of the most promising research directions for power batteries. [0003] Anode materials are an important part of the performance of lithium-ion batteries. At present, graphite is mainly used as the negative electrode material in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 吕璐汪福明岳敏
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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