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A kind of preparation method of zinc oxide/nitrogen-doped carbon composite material that can be used for lithium-ion battery negative electrode

A lithium-ion battery, nitrogen-doped carbon technology, applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of high production cost of lithium batteries, low initial charge and discharge capacity, complicated operation steps, etc., to achieve Improve the electrochemical performance, improve the conductivity, and improve the effect of lithium storage capacity

Active Publication Date: 2018-06-05
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of poor electrical conductivity and serious volume expansion of the current lithium-ion battery negative electrode material zinc oxide, as well as the defects of high production cost, complicated operation steps and low initial charge-discharge capacity of the lithium battery prepared by using it, and provide A kind of preparation method of zinc oxide / nitrogen-doped carbon composite material that can be used for lithium-ion battery negative electrode

Method used

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  • A kind of preparation method of zinc oxide/nitrogen-doped carbon composite material that can be used for lithium-ion battery negative electrode
  • A kind of preparation method of zinc oxide/nitrogen-doped carbon composite material that can be used for lithium-ion battery negative electrode

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1: Dissolve 12.4g of CTAB in 750ml of deionized water, add 1.5ml of pyrrole (0.022mol in moles) into the CTAB (cetyltrimethylammonium bromide) solution and stir for 3h.

[0034] Step 2: Dissolve 5.1 g of APS (ammonium persulfate, 0.022 mol in moles) in 45 ml of deionized water.

[0035] Step 3: Place the above two solutions in a refrigerator to cool to 2°C, then add the APS solution to the CTAB solution and react for 24 hours.

[0036] Step 4: Suction filter the above mixed liquid, alternately wash with absolute ethanol and deionized water, and then dry the precipitate at 70°C overnight (12h) to obtain polypyrrole.

[0037] Step 5: put the polypyrrole obtained above into a tube furnace, heat up at a rate of 2.5° C. / min in an argon atmosphere, and carbonize at 800° C. for 2 hours to obtain nitrogen-doped carbon.

[0038] Step 6: Dissolve 0.08 g of the above-mentioned nitrogen-doped carbon in 30 ml of absolute ethanol and stir to dissolve; at the same time, dissolve...

Embodiment 2

[0043] Embodiment 2: other is with embodiment 1, difference is that the zinc acetate used in step 6 is 1.43g (the number of moles is 0.008mol), and the lithium hydroxide used is 0.377g (the number of moles is 0.016mol), obtains zinc oxide / Nitrogen-doped carbon composites. At a rate of 0.1C, its initial discharge capacity reaches 1691mAh / g, and the discharge capacity can still maintain 592mAh / g after 100 cycles.

Embodiment 3

[0044] Example 3: Others are the same as Example 1, except that in step 7, the lithium hydroxide solution dropping time is changed to 10 minutes, and the stirring time is changed to 48 hours to obtain a zinc oxide / nitrogen-doped carbon composite material. At a rate of 0.1C, its initial discharge capacity reaches 1706mAh / g, and the discharge capacity can still maintain 598mAh / g after 100 cycles.

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Abstract

The invention provides a preparation method of a zinc oxide / nitrogen-doped carbon composite material capable of being used for a lithium ion battery negative cathode. The method is applied to low-temperature polymerization reaction to prepare polypyrrole, then polypyrrole is prepared into nitrogen-doped carbon, and then the zinc oxide / nitrogen-doped carbon composite material is prepared through a sol-gel method. Compared with other carbon materials, nitrogen elements in nitrogen-doped carbon can change distribution of electron cloud around carbon atoms, agglomeration of the carbon atoms is effectively prevented, and compared with other common carbon materials, the nitrogen-doped carbon composite material has more excellent electrical conductivity and chemical stability.

Description

Technical field: [0001] The invention relates to the technical field of negative electrode materials for lithium-ion batteries, in particular to a method for manufacturing a zinc oxide / nitrogen-doped carbon composite material for lithium-ion batteries. Background technique: [0002] In the 21st century, with the development of the electronics industry, lithium-ion batteries are used more and more widely. The requirements for its capacity and stability are getting higher and higher. However, commercial graphite anode materials have been difficult to meet people's demand for high specific capacity batteries. For this reason, many scientists are looking for better anode materials to replace graphite anodes. [0003] Theoretical specific capacity is an important parameter to measure the performance of negative electrode materials. Because of the high theoretical specific capacity (978mAh / g) of zinc oxide, it has become a research hotspot for scientists. ZnO is rich in resourc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/583H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/483H01M4/583H01M10/0525Y02E60/10
Inventor 张永光殷福星王新谭台哲
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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