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A lithium ion battery cathode material, preparation method and application thereof

A lithium-ion battery and cathode material technology, applied in the field of lithium-ion battery cathode materials and their preparation, can solve the problems of low self-discharge, complex process, poor electrode performance, etc., and achieve easy large-scale production, simple process, and excellent discharge ratio. The effect of capacity

Inactive Publication Date: 2019-01-08
盐城市新能源化学储能与动力电源研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of performance requirements for power batteries in the fields of hybrid electric vehicles and pure electric vehicles, lithium-ion batteries have become the first choice due to their advantages such as high lithium-ion specific energy, low self-discharge, and long life. There are also some problems. For the positive electrode material, its high-rate charge-discharge performance needs to be further improved. In recent years, graphene, as a new material, has a very large surface area (2675 square meters per gram). Ultra-high conductivity on the plane, becoming a new carbon material to improve the performance of lithium-ion battery electrode materials
[0003] Although there have been many reports on the preparation of graphene-coated electrode materials, due to the ultra-high surface area of ​​graphene, it is very easy to spontaneously stack and agglomerate, resulting in poor electrode performance and complicated processes.

Method used

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  • A lithium ion battery cathode material, preparation method and application thereof
  • A lithium ion battery cathode material, preparation method and application thereof
  • A lithium ion battery cathode material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment is a preparation method of a lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0047] One side of the expanded graphite sheet is coated with conductive glue, and the other side is used as a cathode and placed in an organic electrolyte solution for electrolysis. Subsequently, the graphene electrode material obtained by electrolysis is cleaned with acetone, and dried at 50°C to obtain a graphene electrode. , the organic electrolyte solution is DMSO and LiClO 4 solution; the electrolysis voltage is 1v, and the electrolysis time is 5h;

[0048] LiCoO 2 Perform ball milling and ultrasonically disperse in water to obtain a suspension, in which LiCoO 2 The concentration is 20g / L, LiCoO after ball milling 2 The particle size is 0.1-3μm, and the ball milling time is 10h;

[0049] Put the graphene electrode and the metal electrode into the suspension, and apply an electric field between the two electrodes...

Embodiment 2

[0053] This embodiment is a preparation method of a lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0054] One side of the expanded graphite sheet is coated with conductive glue, and the other side is used as a cathode and placed in an organic electrolyte solution for electrolysis. Subsequently, the electrolytic graphene electrode material is cleaned with acetic acid solution, and dried at 45°C to obtain a graphene electrode. Among them, the organic electrolyte solution is dimethyl sulfone and Et 3 NHC solution; electrolysis voltage is 2v, electrolysis time is 4h;

[0055] Will LiNi 0.5 mn 1.5 o 4 Perform ball milling and ultrasonically disperse in N-methylpyrrolidone to obtain a suspension, in which LiNi 0.5 mn 1.5 o 4 The concentration is 10g / L, LiNi after ball milling 0.5 mn 1.5 o 4 The particle size is 0.1-3μm, and the ball milling time is 10h;

[0056] Put the graphene electrode and the metal electrode in...

Embodiment 3

[0060] This embodiment is a preparation method of a lithium-ion battery positive electrode material, the preparation method comprising the following steps:

[0061] One side of the expanded graphite sheet is coated with conductive glue, and the other side is used as a cathode and placed in an organic electrolyte solution for electrolysis. Subsequently, the graphene electrode material obtained by electrolysis is cleaned with ethanol, and dried at 55 ° C to obtain a graphene electrode. , the organic electrolyte solution is a solution of dimethyl sulfide and 1-methyl-3-ethylimidazolium diimine; the electrolysis voltage is 3v, and the electrolysis time is 3h;

[0062] LiMn 2 o 4 Perform ball milling and ultrasonic dispersion in ethylene glycol, acetone and N-methylpyrrolidone to obtain a suspension, in which LiMn 2 o 4 The concentration is 50g / L, LiMn after ball milling 2 o 4 The particle size is 1.1-3μm, and the ball milling time is 2h;

[0063] Put the graphene electrode a...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method and application thereof. The preparation method comprises the following steps: ball milling the cathode raw material and dispersing it in a solvent to obtain a suspension; A graphene electrode and a metal electrode are placed in a suspension and an electric field is applied between the two electrodes, whereinthe graphene electrode is used as an anode and the metal electrode is used as a cathode; Taking out the graphene electrode and drying to obtain the cathode material of the lithium ion battery; The preparation method has simple process and is easy to be produced on a large scale. Moreover, the cathode material prepared by the preparation method has excellent electrochemical performance and high rate charge-discharge performance.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a lithium-ion battery positive electrode material and a preparation method and application thereof. Background technique [0002] With the continuous improvement of performance requirements for power batteries in the fields of hybrid electric vehicles and pure electric vehicles, lithium-ion batteries have become the first choice due to their advantages such as high lithium-ion specific energy, low self-discharge, and long life. There are also some problems. For the positive electrode material, its high-rate charge-discharge performance needs to be further improved. In recent years, graphene, as a new material, has a very large surface area (2675 square meters per gram). The ultra-high conductivity on the plane has become a new type of carbon material to improve the performance of lithium-ion battery electrode materials. [0003] Although there have been many reports on the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66H01M10/0525
CPCH01M4/0404H01M4/0457H01M4/663H01M10/0525Y02E60/10
Inventor 黄兵
Owner 盐城市新能源化学储能与动力电源研究中心
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