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Preparation method of zinc oxide quantum dot negative electrode material coated with multilevel structure carbon

A negative electrode material, zinc oxide technology, applied in the field of secondary battery material preparation, can solve problems such as poor cycle performance, low theoretical electrochemical capacity, unsatisfactory first discharge efficiency, etc., to achieve improved stability, simple and controllable process, and reduce Effect of Small Volume Expansion Effect

Active Publication Date: 2014-12-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anodes of commercial lithium-ion batteries are generally carbon materials such as graphite and carbon fiber, but their relatively low theoretical electrochemical capacity, unsatisfactory initial discharge efficiency, and poor cycle performance make it urgent to seek new anode materials to replace carbon materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 10 g each of zinc chloride and 1,4-phthalic acid, put them into a polytetrafluoroethylene reactor, add 50 g of deionized water, stir well, and adjust the pH of the solution to 4 with 4 mol / L hydrochloric acid. After sealing the reaction kettle, keep it warm at 150°C for 12 hours, cool down to room temperature with the furnace, filter the reaction product, wash it 4 times with deionized water, and dry it. The dried product was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised at a rate of 3°C / min, heated at 600°C for 1 hour, and then cooled with the furnace to obtain a surface-coated zinc oxide material.

Embodiment 2

[0022] Weigh 15 g of zinc carbonate and 12 g of 1,3,5-benzenetricarboxylic acid, put them into a polytetrafluoroethylene reactor, add 60 g of methanol, stir well, and adjust the pH of the solution to 5 with 4 mol / L hydrochloric acid. After sealing the reaction kettle, keep it warm at 100°C for 15 hours, cool down to room temperature with the furnace, filter the reaction product, wash it 4 times with deionized water, and dry it. The dried product was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised at a rate of 5°C / min, heated at 500°C for 2 hours, and then cooled with the furnace to obtain a surface-coated zinc oxide material.

Embodiment 3

[0024] Weigh 20 g of zinc sulfate and 18 g of 2,6-pyridinedicarboxylic acid, put them into a polytetrafluoroethylene reactor, add 45 g of ethanol, stir well, and adjust the pH value of the solution to 4 with 4 mol / L sulfuric acid. After sealing the reaction kettle, keep it warm at 120° C. for 10 h, cool down to room temperature with the furnace, filter the reaction product, wash it 4 times with deionized water, and dry it. The dried product was placed in a tube furnace under N 2 Under the atmosphere, the temperature was raised at a rate of 4°C / min, heated at 700°C for 1.5h, and then cooled with the furnace to obtain a surface-coated zinc oxide material.

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Abstract

The invention discloses a preparation method of a zinc oxide quantum dot negative electrode material coated with multilevel structure carbon. The method comprises the following steps: firstly, a phenyl / pyridyl carboxylic acid compound and zinc salt are weighed at a mole ratio, and a coordination polymer of zinc and carboxylic acid is prepared by utilizing a hydrothermal / solvothermal method under the conditions that the pH value is 5-11, the temperature ranges from 80 DEG C to 180 DEG C, and the reaction time is 5-36h; secondly, the prepared polymer is calcined for 30min-120min at 400 DEG C to 800 DEG C in an inert atmosphere, so that the zinc oxide quantum dot (2-100nm) negative electrode material coated with multilevel structure carbon is prepared. The zinc oxide material prepared by the method has the following advantages: (1) the precursor purity is high, and the zinc oxide negative electrode material with high purity and high performance can be obtained after calcination; (2) a multilevel carbon structure array can play a role of'fixing frame' for zinc oxide, reduce the volume effect in a charge-discharge cycle process, improve the structure stability of zinc oxide, and further improve the electronic conductivity of zinc oxide, so as to improve the battery cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of secondary battery materials, in particular to a preparation method of a multi-level structure carbon-coated zinc oxide quantum dot negative electrode material. Background technique [0002] In recent years, lithium-ion secondary batteries have developed rapidly, and their obvious advantages such as high voltage, high energy density, low self-discharge rate, and high cycle life make lithium-ion secondary batteries are playing an increasingly important role. It is precisely because lithium-ion secondary batteries are more and more widely used that people have higher and higher requirements for their performance, including energy density, cycle life and safety performance of batteries. Material improvements. At present, the anodes of commercial lithium-ion batteries are generally carbon materials such as graphite and carbon fiber, but their relatively low theoretical electrochemical capacity, unsatisf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/139
CPCH01M4/366H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 杨尘刘大军杨续来
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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