Method for preparing high performance flexible negative electrode materials

A negative electrode material, high-performance technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problems of application, electrolyte infiltration and impossibility, etc., and achieve simple equipment, excellent electrochemical performance, and simple preparation process.

Inactive Publication Date: 2015-09-16
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of pure flexible graphite paper cannot be used as an electrode material for lithium-ion batteries because it is difficult for the electrolyte to infiltrate into the material.

Method used

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  • Method for preparing high performance flexible negative electrode materials
  • Method for preparing high performance flexible negative electrode materials
  • Method for preparing high performance flexible negative electrode materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The expanded graphite with an expansion volume of 498 mL / g obtained by expanding natural graphite with a particle size of 50 mesh and a fixed carbon content of 98% is selected as a raw material. 0.1g expanded graphite, 0.2g Co(NO 3 ) 2 ·6H 2 O, 0.02g ammonium fluoride and 0.03g urea are uniformly dispersed in water. Afterwards, the mixed solution was transferred to a hydrothermal kettle for reaction at 130° C. for 6 h. The product was filtered and dried at 70°C to obtain expanded graphite loaded with metal oxide nanoparticles. Then it was placed in a tube furnace and heat-treated at 400 °C for 4 h in an inert atmosphere. Finally, the heat-treated powder is evenly spread, and a flexible negative electrode material with a thickness of about 80 μm is obtained by simple roll forming (see figure 1 , the left image is the flat state of the material, and the right image is the curled state of the material). At a current density of 100mA / g, the first coulombic efficiency ...

Embodiment 2

[0030] The expanded graphite with an expansion volume of 435 mL / g obtained by expanding natural graphite with an average particle size of 100 mesh and a fixed carbon content of 95% is selected as a raw material. 0.1g expanded graphite, 0.23g Fe(NO 3 ) 2 ·6H 2 O, 0.015g ammonium fluoride and 0.035g urea are uniformly dispersed in water. Afterwards, the mixture was transferred to a hydrothermal kettle for reaction at 120° C. for 4 hours. The product was filtered and dried at 80°C to obtain expanded graphite loaded with metal oxide nanoparticles. Then it was placed in a tube furnace and heat-treated at 800 °C for 2 h in an inert atmosphere. Finally, the heat-treated powder is evenly spread, and a flexible negative electrode material with a thickness of about 60 μm can be prepared by simple roll forming. At a current density of 100mA / g, the first coulombic efficiency reaches 71%, and the reversible capacity after 50 cycles reaches 632mAh / g.

Embodiment 3

[0032] The expanded graphite with an expansion volume of 350 mL / g obtained by expanding natural graphite with an average particle size of 160 mesh and a fixed carbon content of 95% is selected as a raw material. 0.1g expanded graphite, 0.13g SnCl 4 , 0.01g ammonium fluoride and 0.025g urea are uniformly dispersed in water. Afterwards, the mixed solution was transferred to a hydrothermal kettle for reaction at 110° C. for 6 h. The product was filtered and dried at 75°C to obtain expanded graphite loaded with metal oxide nanoparticles. Then it was placed in a tube furnace and heat-treated at 600 °C for 3 h in an inert atmosphere. Finally, the heat-treated powder is evenly spread, and a flexible negative electrode material with a thickness of about 150 μm can be prepared by simple roll forming. At a current density of 100mA / g, the first coulombic efficiency reaches 68%, and the reversible capacity after 50 cycles reaches 547mAh / g.

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Abstract

The invention discloses a method for preparing high performance flexible negative electrode materials, wherein high performance flexible negative electrode materials which are 40-300MuM in thickness are prepared by simply rolling and forming expanded graphite supported with moderate high storage lithium capacity metal oxide particles. The method for preparing the high performance flexible negative electrode materials is simple and rapid in operation, excellent in stability, low in energy consumption, wide source of raw materials, low in cost and easy to produce in large scale. Prepared flexible negative electrodes do not need to add binders, conductive agents and metal current collectors, and has the advantages of high initial coulomb efficiency and reversible capacity, excellent cycling stability and rate capability and the like.

Description

technical field [0001] The invention relates to an electrode material, in particular to a flexible negative electrode material, and specifically belongs to a preparation method of a low-cost, high-performance flexible lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used as the main source of power for consumer electronics due to their high operating voltage and energy density, good cycle stability, and environmental friendliness. However, in recent years, with the continuous emergence of flexible and wearable electronic products such as electronic tags and smart bracelets, higher and higher requirements have been placed on lithium-ion batteries. As far as the current commercial lithium-ion battery is concerned, its structure is still too thick and rigid to be applied to flexible electronic devices. Therefore, it is of great practical significance and broad market prospect to develop a lighter, thinner, fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/1391
CPCH01M4/131H01M4/483H01M4/62H01M2004/027Y02E60/10
Inventor 赵云马灿良李思殿
Owner SHANXI UNIV
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