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Lithium ion battery electrode material coated with non-continuous graphene

A graphene-coated, lithium-ion battery technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems that restrict the development of lithium iron phosphate, slow diffusion of lithium ions, and complex surface structures, etc., to achieve large-scale The effects of industrial production and application, good lithium ion mobility, and broad application prospects

Active Publication Date: 2012-04-11
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of lithium iron phosphate is poor, the diffusion rate of lithium ions is slow, and the actual specific capacity is low when charging and discharging at a high rate. These problems restrict the development of lithium iron phosphate industrialization
At present, lithium iron phosphate composite materials are often prepared by doping conductive agents or coating conductive agents to improve the ion mobility and electronic conductivity of lithium iron phosphate, but there are still certain problems in the reported lithium iron phosphate composite materials: The high cost of preparation of carbon nanotubes leads to high cost of lithium iron phosphate composite materials doped with carbon nanotubes, which is not conducive to large-scale industrial production; the surface structure of lithium iron phosphate composite materials coated with conductive agents such as natural graphite powder or carbon black Complex, large interface resistance, large capacity drop and tap density drop during rate charge and discharge
The Chinese patent application with the publication number CN 101800310A discloses a composite positive electrode material doped with graphene in lithium iron phosphate, the conductivity of the material is improved, but it is easy to cause The distribution of graphene in lithium iron phosphate is not uniform, and there are phenomena such as agglomeration

Method used

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  • Lithium ion battery electrode material coated with non-continuous graphene
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  • Lithium ion battery electrode material coated with non-continuous graphene

Examples

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Effect test

Embodiment 1

[0032] Disclosed is a discontinuous graphene-coated lithium ion battery electrode material, wherein the electrode material is lithium iron phosphate particles, a positive electrode material, and the coated graphene is discontinuously and tightly attached to the surface of the lithium iron phosphate particles. The area covered by graphene accounts for 99% of the total surface area of ​​the lithium iron phosphate particles. The mass ratio of discontinuous graphene to lithium iron phosphate particles is 5%.

[0033] In this implementation, the lithium iron phosphate particles coated with discontinuous graphene are prepared according to the following steps:

[0034] Lithium iron phosphate particles are sintered in an atmosphere furnace, methanol, water vapor, and inert gas nitrogen and argon are introduced at the same time, and the volume fractions of methanol and water vapor introduced are 40% and 10% respectively, and the atmosphere is controlled. The temperature in the furnace...

Embodiment 2

[0037] A discontinuous graphene-coated lithium ion battery electrode material, wherein the electrode material is lithium nickelate particles, which are positive electrode materials, and the coated graphene is discontinuously and closely attached to the surface of the lithium nickelate particles. The coated graphene is multilayer graphene with 4-8 layers. The area covered by graphene accounts for 99% of the total surface area of ​​lithium nickelate particles. The mass ratio of discontinuous graphene to lithium nickelate particles is 10%.

[0038] Its preparation method is the same as in Example 1, the only difference is that the electrode material is lithium nickelate particles, and the volume fractions of methanol and water vapor introduced are respectively 90% and 0.1%, the inert gas is nitrogen, and the temperature in the atmosphere furnace is controlled 500°C, and reacted for 40 hours.

Embodiment 3

[0040]A discontinuous graphene-coated lithium-ion battery electrode material, wherein the electrode material is lithium iron manganese phosphate particles of positive electrode material, and the coated graphene is discontinuously and tightly attached to the surface of the lithium iron manganese phosphate particles. The coated graphene is multilayer graphene with 2-6 layers. The area covered by graphene accounts for 30% of the total surface area of ​​the lithium iron manganese phosphate particles. The mass ratio of discontinuous graphene to lithium iron manganese phosphate particles is 0.2%. Its preparation method is the same as in Example 1, the only difference is that the electrode material is lithium iron manganese phosphate particles, and the volume fractions of ethyl acetate and water vapor introduced are 1% and 15% respectively, the inert gas is argon, and the atmosphere is controlled The temperature in the furnace was 1300°C, and the reaction was carried out for 3 hours...

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Abstract

The invention provides a lithium ion battery electrode material coated with non-continuous grapheme. The electrode material is an anode material or a cathode material; the coated graphene is non-continuously and tightly attached to the surface of electrode material particles; and the electrode material has superior conducting performance and high lithium ion mobility ratio. The lithium ion battery electrode material coated with the non-continuous grapheme has wide application prospect and low cost, contributes to greatly enhancing the comprehensive performance of a lithium ion, and is suitable for large-scale industrial production and application.

Description

technical field [0001] The invention relates to a lithium ion battery electrode material, in particular to a discontinuous graphene-coated lithium ion battery electrode material. Background technique [0002] A lithium-ion battery is composed of positive and negative electrodes and an electrolyte, and is a rechargeable and dischargeable high-energy battery that exchanges energy through Li+ intercalation and intercalation of positive and negative electrode materials. When the battery is charging, lithium ions are intercalated from the positive electrode and intercalated in the negative electrode, and vice versa when discharging. It is necessary for an electrode to be in a lithium-intercalated state before assembly. Generally, a lithium-intercalated transition metal oxide with a potential greater than 3.5V relative to lithium and stable in air is selected as the positive electrode, such as Li 1-X CoO 2 (0<X<0.8), Li 1-X NiO 2 (0<X<0.8) and Li 1-X mn 2 o 4 (0...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/58
CPCY02E60/122Y02E60/10
Inventor 孔令涌吉学文王允实
Owner SHENZHEN DYNANONIC
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