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Method for preparing anode material of three-dimensional porous carbon skeleton/CoO composite structured lithium ion battery

A lithium-ion battery, composite structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of small specific surface area of ​​materials and less loaded oxides

Active Publication Date: 2016-08-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous biomass carbon loaded with oxides has a relatively large pore size, which makes the specific surface area of ​​the material itself relatively small, and the amount of loaded oxides will be relatively small.

Method used

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  • Method for preparing anode material of three-dimensional porous carbon skeleton/CoO composite structured lithium ion battery
  • Method for preparing anode material of three-dimensional porous carbon skeleton/CoO composite structured lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: A preparation method of a three-dimensional porous carbon skeleton / CoO composite structure lithium-ion battery negative electrode material,

[0020] 1) Wash the peanut skins and dry them;

[0021] 2) Put 3 g of peanut skins into 60 ml of concentrated sulfuric acid solution with a concentration of 5 mol / L, and react in an oven at 80°C for 5 hours to obtain suspension A;

[0022] 3) Suspension A was subjected to vacuum filtration, and rinsed with deionized water to pH = 7, then collected and dried to obtain precursor B;

[0023] 4) Mix precursor B and potassium hydroxide at a mass ratio of 1:1 and grind them evenly to obtain product C;

[0024] 5) Put the product C into a tube furnace with argon gas, set the reaction temperature to 800°C, keep it warm for 2h, and the heating rate is 3°C·min -1 , argon flow rate 0.2sccm·min -1 , to obtain the product D;

[0025] 6) Add 0.02mol of analytically pure cobalt acetate tetrahydrate and 0.06mol of urea into 100ml of...

Embodiment 2

[0029] Example 2: A preparation method of a three-dimensional porous carbon skeleton / CoO composite structure lithium ion battery negative electrode material,

[0030] 1) Wash the garlic skin and dry it;

[0031] 2) Put 4 g of garlic skin into 60 ml of concentrated sulfuric acid solution with a concentration of 7 mol / L, and react in an oven at 80°C for 7 hours to obtain suspension A;

[0032] 3) Suspension A was subjected to vacuum filtration, and rinsed with deionized water to pH = 7, then collected and dried to obtain precursor B;

[0033]4) Mix precursor B and potassium hydroxide at a mass ratio of 1:2 and grind them evenly to obtain product C;

[0034] 5) Put the product C into a tube furnace with argon gas, set the reaction temperature to 700°C, keep it warm for 3h, and the heating rate is 5°C·min -1 , argon flow rate 0.5sccm·min -1 , to obtain the product D;

[0035] 6) Take 0.02mol of analytically pure cobalt acetate tetrahydrate and 0.08mol of urea into 100ml of dei...

Embodiment 3

[0037] Example 3: A preparation method of a three-dimensional porous carbon skeleton / CoO composite structure lithium-ion battery negative electrode material,

[0038] 1) Wash the onion skin and dry it;

[0039] 2) Put 6g of green onion skin into 60ml of concentrated sulfuric acid solution with a concentration of 10mol / L, and react in an oven at 80°C for 6h to obtain suspension A;

[0040] 3) Suspension A was subjected to vacuum filtration, and rinsed with deionized water to pH = 7, then collected and dried to obtain precursor B;

[0041] 4) Mix precursor B and potassium hydroxide at a mass ratio of 1:3 and grind them evenly to obtain product C;

[0042] 5) Put the product C into a tube furnace with argon gas, set the reaction temperature to 900°C, keep it warm for 1h, and the heating rate is 8°C·min -1 , argon flow rate 0.4sccm·min -1 , to obtain the product D;

[0043] 6) Add 0.02mol of analytically pure cobalt acetate tetrahydrate and 0.07mol of urea into 100ml of deioni...

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Abstract

The invention relates to a method for preparing an anode material of a three-dimensional porous carbon skeleton / CoO composite structured lithium ion battery. Parenchymatous tissue of plants is used as the biomass carbon material; the biomass carbon material is immersed through acid, such that a pre-carbonized precursor is obtained; then, the precursor and alkali are mixed and sufficiently grinded, and then thermally treated in a tube furnace, such that a three-dimensional porous carbon skeleton is obtained; the three-dimensional porous carbon skeleton is immersed in solution including cobalt salt; then, suction filtration and drying are carried out; and finally, the mixture is thermally treated in the tube furnace, such that a CoO loaded three-dimensional porous carbon skeleton composite is obtained. The composite is applied to the lithium ion battery, such that the lithium ion battery has good cycle performance and rate performance; the porous carbon skeleton, prepared by using the parenchymatous tissue of plants as the biomass carbon material, has a steady structure for supporting load of CoO; the porous carbon skeleton having different pore diameters can be obtained by controlling the addition amount of urea; due to the porous carbon skeleton, the CoO structure can be stabilized; simultaneously, the electrical conductivity of CoO is also improved; therefore, the electron transmission rate is increased; the electrochemical reaction is accelerated; and the rate performance is improved easily.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional porous carbon skeleton-loaded oxide lithium ion battery negative electrode material, in particular to a preparation method of a three-dimensional porous carbon skeleton / CoO composite structure lithium ion battery negative electrode material. Background technique [0002] With the continuous development and updating of the new generation of electronic products and electric vehicles, people have put forward higher requirements for the performance of lithium-ion batteries, and the development of new and cheap negative electrode materials has become one of the hot topics in the research of lithium-ion batteries. The transition metal oxide CoO has become a research hotspot due to its high theoretical capacity (715mAh / g), but its poor electrical conductivity and volume expansion during charge and discharge limit its practical application. At present, the main method to solve these problems ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/52H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李嘉胤康倩曹丽云程娅伊齐慧欧阳海波许占位黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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