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Carbon core/copper oxide housing composite electrode for lithium ion battery and preparation method thereof

A lithium-ion battery, composite electrode technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems affecting battery cycle life, poor conductivity of CuO, and electrode material pulverization, etc. Achieve the effects of improving reversible capacity and cycle life, improving conductivity, and buffering volume changes

Pending Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have, to a certain extent, solved the problem of poor electrical conductivity of CuO resulting in a decrease in battery performance.
[0004] In addition, during the cycle charge and discharge process of lithium-ion batteries, the process of lithium intercalation and delithiation inside the active material will inevitably cause the expansion and contraction of the particle volume of the active material, which will cause the pulverization of the electrode material and affect the cycle life of the battery.

Method used

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  • Carbon core/copper oxide housing composite electrode for lithium ion battery and preparation method thereof
  • Carbon core/copper oxide housing composite electrode for lithium ion battery and preparation method thereof
  • Carbon core/copper oxide housing composite electrode for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A preparation of a carbon core / copper oxide shell composite electrode for lithium-ion batteries, comprising the steps of:

[0051] Preparation of copper-coated carbon fibers

[0052] (1) Surface degumming: Put the carbon fiber with a length of 1 mm in the air in a high-temperature resistance furnace and burn for 30 minutes at a temperature of 400°C to remove the protective glue on the surface of the carbon fiber, improve the bonding force between the coating and the carbon fiber, and reduce the contact resistance between the coating and the carbon fiber;

[0053] (2) Surface roughening: the carbon fibers after deglue were placed in a concentration of 15wt% (NH 4 ) 2 S 2 o 8 Ultrasonic immersion in the solution for 30min made the surface of the carbon fiber rough and hydrophilic; followed by soaking it in a NaOH solution with a concentration of 10wt% for 5min to remove the residual (NH 4 ) 2 S 2 o 8 , and clean the carbon fiber until the washing solution is neutr...

Embodiment 2

[0064] The carbon core / copper oxide shell composite electrode prepared in Example 1 is assembled into a lithium-ion half-cell assembly schematic diagram as image 3 As shown, it includes upper battery case 1, shrapnel 2, gasket 3, lithium sheet 4, diaphragm 5, electrolyte 6, lower battery case 7 and carbon core / copper oxide shell composite electrode 8;

[0065] The carbon core / copper oxide shell composite electrode 8 is placed on the lower battery shell 7, and the electrolyte 6 fills the entire cavity composed of the carbon core / copper oxide shell composite electrode 8, the lower battery shell 7 and the diaphragm 5, and the entire cavity is filled with There are active substances, and the electrolyte 6 directly infiltrates the active substances on the carbon core / copper oxide shell composite electrode 8; the lithium sheet 4 is closely attached to the diaphragm 5, and the upper surface of the lithium sheet 4 is placed in sequence from bottom to top. Gasket 3 and shrapnel 2. Gas...

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Abstract

The invention discloses a carbon core / copper oxide housing composite electrode for a lithium ion battery and a preparation method thereof. A core part of the carbon core / copper oxide housing composite electrode is formed by carbon fibers, and a housing of the carbon core / copper oxide housing composite electrode is a copper oxide thin layer; and the copper oxide thin layer is provided with nano needle-shaped structures and nano pore-shaped structures, which are arranged in an array mode. The preparation method of the carbon core / copper oxide housing composite electrode comprises the following steps of: (1) preparation of copper-coated carbon fibers; (2) sintering moulding of the copper-coated carbon fibers; and (3) surface oxidation treatment of a formed copper-coated carbon fiber felt. According to the carbon core / copper oxide housing composite electrode disclosed by the invention, charging and discharging capacity of the lithium ion battery is improved, and electrochemical properties of a cycle life, coulombic efficiency, cycling stability and the like of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon core / copper oxide shell composite electrode for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a green high-energy rechargeable chemical power source, which has outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. It has been widely used in defense industry and other fields. [0003] Carbon materials are currently the most widely used negative electrode materials in lithium-ion batteries. They have suitable lithium intercalation potential (0.15~0.25V), good conductivity, stable cycle, rich resources and low price, and have long become the mainstream of the market. However, the theoretical specific capacity of carbon materials is low (372mAh g -1 ), has been unable to meet people's excessive demand for energy, so pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/48H01M4/583H01M4/625H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 袁伟罗健潘保有邱志强黄诗敏闫志国谭振豪汤勇
Owner SOUTH CHINA UNIV OF TECH
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