Graphite intercalation compound lithium-ion battery negative electrode material, as well as preparation method and application thereof

A lithium-ion battery and graphite intercalation technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low reversible capacity and small interlayer spacing

Inactive Publication Date: 2013-09-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention overcomes the disadvantages of relatively small layer spacing and low reversible capacity of graphite negative electrode materials in the prior art, and proposes a method for preparing a new lithium-ion battery negative electrode material by using graphite intercalation

Method used

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  • Graphite intercalation compound lithium-ion battery negative electrode material, as well as preparation method and application thereof
  • Graphite intercalation compound lithium-ion battery negative electrode material, as well as preparation method and application thereof
  • Graphite intercalation compound lithium-ion battery negative electrode material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 2g of graphite and 5.41g of anhydrous ferric chloride (the molar ratio of graphite to ferric chloride is 10:2) and mix them thoroughly, and then dry them in a vacuum oven at 80°C for 8 hours. The dried sample is treated at 600°C in a nitrogen atmosphere 3 hours. The resulting product is washed with deionized water until there is no Fe in the washing liquid 3+ . The washed sample was dried in a vacuum oven at 120°C for 10 hours.

[0047] The negative electrode material powder prepared above and the 9% polyvinylidene fluoride N-methyl-2-pyrrolidone solution are fully ground into a uniform slurry-like viscous liquid, wherein the polyvinylidene fluoride accounts for 10% of the weight of the negative electrode material powder; The copper foil is coated with a thickness of 0.1mm, and the solvent is volatilized and subjected to rolling treatment under a pressure of 1MPa, and then placed in a vacuum oven at 80°C for 12 hours to dry, which is used as a working electrode of a...

Embodiment 2

[0049] Weigh 2g of graphite and 4.33g of anhydrous cobalt chloride (the molar ratio of graphite to cobalt chloride is 10:2) and mix them thoroughly, and then dry them in a vacuum oven at 80°C for 8 hours. The dried sample is treated at 700°C in a nitrogen atmosphere. 3 Hours. The resulting product is washed with deionized water until there is no Co in the washing liquid 3+ . The washed sample was dried in a vacuum oven at 120°C for 10 hours.

[0050] The negative electrode material powder prepared above and the 9% polyvinylidene fluoride N-methyl-2-pyrrolidone solution are fully ground into a uniform slurry-like viscous liquid, wherein the polyvinylidene fluoride accounts for 10% of the weight of the negative electrode material powder; The copper foil is coated with a thickness of 0.1mm, and the solvent is volatilized and subjected to rolling treatment under a pressure of 1MPa, and then placed in a vacuum oven at 80°C for 12 hours to dry, which is used as a working electrode of ...

Embodiment 3

[0052] Weigh 2g of graphite and 4.48g of anhydrous copper chloride (the molar ratio of graphite to copper chloride is 10:2) and mix them thoroughly, and then dry them in a vacuum oven at 80°C for 8 hours. The dried sample is treated at 500°C in a nitrogen atmosphere. 3 Hours. The resulting product is washed with deionized water until there is no Cu in the washing liquid 2+ . The washed sample was dried in a vacuum oven at 120°C for 10 hours.

[0053] The negative electrode material powder prepared above and the 9% polyvinylidene fluoride N-methyl-2-pyrrolidone solution are fully ground into a uniform slurry-like viscous liquid, wherein the polyvinylidene fluoride accounts for 10% of the weight of the negative electrode material powder; The copper foil is coated with a thickness of 0.1mm, and the solvent is volatilized and subjected to rolling treatment under a pressure of 1MPa, and then placed in a vacuum oven at 80°C for 12 hours to dry, which is used as a working electrode of ...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a graphite intercalation compound lithium-ion battery negative electrode material, as well as a preparation method and application of the graphite intercalation compound lithium-ion battery negative electrode material. The negative electrode material is different from the existing carbon negative electrode material of the lithium-ion battery and is a graphite intercalation compound (GICs0 adopting the graphite as an intercalation main body, wherein the graphite intercalation contains a (compound and insertion) intercalation object (such as metal salt, metal oxide, polymer or monomer) capable of storing lithium ions. The intercalation object of the graphite intercalation compound can reversibly store more lithium ions, so that the gravity and specific volume capacity are far higher than that of an ordinary carbon material; meanwhile, the main body graphite layer can provide a good electron carrier and stable structure for the object, so that the prepared graphite intercalation compound has good large-current discharging property and excellent cycling performance and is a novel negative electrode material with a good application prospect for the lithium-ion battery following the existing carbon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are being used more and more widely, from micro-batteries required for small electronic devices to power sources for large electric vehicles. The improvement of lithium-ion battery performance mainly depends on the performance of lithium intercalation and extraction electrode materials. At present, mesocarbon microspheres and modified graphite are widely used as anode materials in commercial lithium-ion batteries. These anode materials are low in cost, have high conductivity and good cycle stability. However, the theoretical lithium storage capacity of graphite-based negative electrodes is low (372mAh / g); and the discharge platform is too low (0-0.25V), which poses safety hazards. [0003] In addition to carbon m...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/0525
CPCY02E60/10
Inventor 夏永姚王飞易金王永刚
Owner FUDAN UNIV
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