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Application and preparation of Zn-C secondary battery composite material

A composite material, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of ineffective dendrite and passivation inhibition, dendrites and other problems, and achieve rich pore structure, uniform distribution, reduced The effect of small electrode passivation

Inactive Publication Date: 2017-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] But zinc-ion battery also has its problems that need to be solved urgently: (1) dendrite problem, in the charging process of battery of traditional Zn electrode, the zinc ion in the electrolyte reduces and deposits on the surface of zinc electrode, forms dendritic deposit, along with As the cycle of charging and discharging continues, these deposits grow rapidly, forming zinc dendrites
However, it should be pointed out that this method is only a physical mixture, and the inhibitory effect on dendrites and passivation is not obvious

Method used

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  • Application and preparation of Zn-C secondary battery composite material
  • Application and preparation of Zn-C secondary battery composite material
  • Application and preparation of Zn-C secondary battery composite material

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Embodiment 1

[0033] Embodiment one, the preparation of a kind of Zn-C secondary battery composite material, specifically as follows:

[0034] SO1, weigh a certain Zn-based ZIF (i.e. ZIF-8);

[0035] SO2, place the Zn-based ZIF in step S01 in a porcelain boat, then put the porcelain boat filled with Zn-based ZIF in the atmosphere furnace, then pass the protective gas argon in the atmosphere furnace until O in the furnace 2 Exhaust clean, among them, exhaust clean furnace O 2 It is to prevent Zn from forming oxides;

[0036] SO3, O in the furnace 2 After exhausting, raise the temperature in the atmosphere furnace to 250°C to 350°C for pre-carbonization treatment of Zn-based ZIF, wherein the specific temperature values ​​of pre-carbonization treatment can be 250°C, 262.4°C, 291.2°C, 301.7°C, 311.6°C ℃, 323.5℃, 334.8℃, 341.1℃, 350℃. After repeated experiments, it is found that the preferred temperature is 301.7℃. At this time, the structure that is conducive to Zn-C is completely replicated...

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Abstract

The invention relates to a Zn-C secondary battery composite material preparation method. The method includes steps: preparing Zn-based ZIF; pre-carbonizing the obtained Zn-based ZIF in a shield gas atmosphere to obtain pre-carbonized Zn-based ZIF; carbonizing the obtained pre-carbonized Zn-based ZIF in the shield gas atmosphere, and cooling to obtain the Zn-C composite material. The method has advantages that a Zn-C structure is completely replicated from ZIF, uniformity in zinc and carbon distribution is realized, and electrode powdering caused by electrode corrosion in charging and discharging processes is avoided; Zn-C porous structure richness is realized, rich transmission passages are provided for Zn ions, and Zn dendritic crystal generation can be effectively inhibited; due to large Zn-C specific surface area, a large quantity of deposition sites can be provided for Zn or Zn(OH)2, electrode passivation is reduced, and cycle performance is improved.

Description

technical field [0001] The invention relates to the preparation and application of a Zn-C secondary battery composite material. Background technique [0002] Zinc-ion batteries belong to secondary zinc-based batteries. Zinc-based batteries are a series of batteries with a large system and a wide range. They play a pivotal role in the modern battery industry and scientific research. The types include zinc-manganese batteries Zn / MnO 2 battery), zinc-nickel battery (Zn / NiOOH battery), zinc-silver battery (Zn / AgO battery) and zinc-air battery (Zn / Air battery), etc. [0003] As an electrode material, zinc has the following four advantages: (1) Abundant resources, the content of zinc in the earth's crust ranks 23rd, less than iron and aluminum, but the output of zinc is large, ranking fourth among metals in the world, only ranking After iron, aluminum and copper, it is the fourth "common" metal and the third most consumed among non-ferrous metals. my country is rich in geologica...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/054
CPCH01M4/362H01M4/38H01M4/583H01M10/054Y02E60/10
Inventor 韩建涛孙世雄
Owner HUAZHONG UNIV OF SCI & TECH
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