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Method for improving conductivity of zinc oxide negative electrode material applicable to lithium ion battery

A lithium-ion battery and anode material technology, applied in battery electrodes, batteries, secondary batteries, etc., can solve problems such as poor conductivity, zinc oxide lattice distortion, poor rapid charge and discharge ability, etc., to improve conductivity and production costs Low, improve the effect of volume expansion effect

Inactive Publication Date: 2014-08-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of method that improves the conductivity of zinc oxide negative electrode material for lithium ion battery, doping metal ion in zinc oxide material, make the lattice structure of zinc oxide form band Negative defects increase the number of free electrons, thereby improving the conductivity of zinc oxide; at the same time, doping metal ions can distort the zinc oxide lattice, thereby increasing the lattice spacing and enhancing the mobility of lithium ions in the crystal, overcoming the Zinc oxide material has poor conductivity, which leads to the disadvantages of high power characteristics and poor rapid charge and discharge capabilities. It has the characteristics of fast charge and discharge speed, high efficiency, and strong capacity, and has the characteristics of stability, high efficiency, clean and pollution-free, and cheap price.

Method used

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  • Method for improving conductivity of zinc oxide negative electrode material applicable to lithium ion battery
  • Method for improving conductivity of zinc oxide negative electrode material applicable to lithium ion battery
  • Method for improving conductivity of zinc oxide negative electrode material applicable to lithium ion battery

Examples

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Effect test

Embodiment 1

[0036] Weigh 2.5000gZn(CH 3 CO 2 ) 2 2H 2 O (zinc acetate) and 0.0894gAl (NO 3 ) 3 9H 2 O (aluminum nitrate) was dissolved in 40ml of absolute ethanol, stirred for 30min, transferred to a 50ml hydrothermal kettle, and reacted at 150°C for 12h using the traditional hydrothermal method. After the reaction, it was naturally cooled to room temperature, washed with water and ethanol three times respectively, and then dried at 90°C to obtain doped Al 3+ zinc oxide anode material.

Embodiment 2

[0038] Weigh 2.5000gZnCl 2 (Zinc chloride) and 0.0994gAl(SO 4 ) 3 (Aluminum sulfate) was dissolved in 40ml of absolute ethanol, stirred for 30min, transferred to a 50ml hydrothermal kettle, and reacted at 120°C for 2h by microwave hydrothermal method. After the reaction was completed, it was naturally cooled to room temperature, washed with water and ethanol three times respectively, and then dried at 90°C to obtain doped Al 3+ zinc oxide anode material.

Embodiment 3

[0040] Weigh 2.5000gZn(CH 3 CO 2 ) 2 2H 2 O (zinc acetate) and 0.1894gGa (NO 3 ) 3 (Gallium nitrate) was dissolved in 40ml of absolute ethanol, stirred for 30min, transferred to a 50ml hydrothermal kettle, and reacted at 90°C for 15h using a homogeneous hydrothermal method. After the reaction, it was naturally cooled to room temperature, washed with water and ethanol three times respectively, and then dried at 90°C to obtain doped Ga 3+ zinc oxide anode material.

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Abstract

The invention discloses a method for improving conductivity of a zinc oxide negative electrode material applicable to a lithium ion battery. The method comprises the following steps: dissolving metal zinc salt and doped metal salt in a solvent, stirring the solvent, then transferring the solvent to a hydrothermal kettle for carrying out hydrothermal reaction, ending the reaction, then naturally cooling to room temperature, respectively washing by water and ethyl alcohol alternatively, then draying in vacuum to obtain metal M ion doped zinc oxide negative electrode material. Through the method, the defect of forming negative electricity in a lattice structure of the zinc oxide is avoided and the number of free electrons is increased, thereby improving the conductivity of the zinc oxide. Meanwhile, the doped metal ion is capable of distorting the lattices of the zinc oxide, thereby increasing the gap between the lattices, improving the motion capability of the lithium ions in the crystals, and further overcoming the defects of poor high power characteristic and poor quick charging and discharging capacity caused by poor conductivity of the zinc oxide material; the zinc oxide negative electrode material has the characteristics of high quick charging and discharging capacities, high efficiency and high capability; furthermore, the zinc oxide negative electrode material is stable, efficient, clean, pollution-free and low in cost.

Description

technical field [0001] The invention relates to the technical field of performance of negative electrode materials of lithium ion batteries, in particular to a method for improving the conductivity of zinc oxide negative electrode materials used in lithium ion batteries. Background technique [0002] Lithium-ion batteries are successfully used in various portable electronic devices, such as mobile phones, portable computers, etc., due to their high energy density and long service life. At present, industrial lithium-ion batteries mainly use graphite as the negative electrode material, and the theoretical expression of the compound formed by lithium in the carbon material is LiC 6 , the theoretical capacity according to stoichiometry is only 372mAh / g, due to the relatively small density of the carbon material, its volume specific capacity is very low. In addition, when the charge and discharge potential reaches 0 V or lower, lithium is deposited on the graphite electrode, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/362H01M4/48H01M10/0525H01M2220/30Y02E60/10
Inventor 张利锋张金振刘毅郭守武
Owner SHAANXI UNIV OF SCI & TECH
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