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Metal oxide composite self-supporting heat-conducting carbon film, metal lithium negative electrode and preparation and application of metal oxide composite self-supporting heat-conducting carbon film

A self-supporting, oxide-based technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as complex processes and poor lithium affinity, achieve adjustable porosity, reduce current density, and improve long-term cycle stability Effect

Active Publication Date: 2020-06-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the disadvantages of the poor lithium affinity of ordinary carbon materials and the need to use metal-based current collectors for coating and the complex process of compounding lithium negative electrodes, the first purpose of the present invention is to provide a metal oxide composite self-supporting thermal conductivity The preparation method of carbon film (the present invention is also referred to as self-supporting thermally conductive carbon film or thermally conductive carbon film) aims to obtain a kind of brand-new metal oxide with good structural properties and oxide modification with dual functions of host function and current collector. Compound self-supporting thermally conductive carbon film

Method used

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  • Metal oxide composite self-supporting heat-conducting carbon film, metal lithium negative electrode and preparation and application of metal oxide composite self-supporting heat-conducting carbon film
  • Metal oxide composite self-supporting heat-conducting carbon film, metal lithium negative electrode and preparation and application of metal oxide composite self-supporting heat-conducting carbon film
  • Metal oxide composite self-supporting heat-conducting carbon film, metal lithium negative electrode and preparation and application of metal oxide composite self-supporting heat-conducting carbon film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A heat-conducting carbon film is obtained by mixing polymer polyimide with graphene after carbonization at 800°C for 2 hours and pressing it in a hot roller press to form a film. The film forming pressure is 6MPa and the rolling speed is 1.0m. / min, the temperature is 400°C; the obtained thermally conductive carbon film (see SEM picture figure 1 ; film-forming structure, and there are certain wrinkles on the surface), it is cut into a disc with a diameter of 13mm for later use. Weigh 2.39g of zinc nitrate hexahydrate Zn(NO3)2·6H2O and dissolve in 100mL of anhydrous methanol to form a colorless solution A; weigh 4.69g of 2-methylimidazole and 1g of the modified carbon film, and dissolve them in 100mL Solution B was configured in anhydrous methanol. Secondly, under the condition of magnetic stirring, with the help of a separatory funnel, will contain a large amount of Zn 2+ The solution A was added dropwise to the solution B containing a large amount of organic ligands ...

Embodiment 2

[0068] Compared with Example 1, the only difference is that the charging and discharging system is changed. The result is: at 1mA / cm 2 current density and 3mAh / cm 2 Under the area capacity, the average Coulombic efficiency reaches 98.1%, and the stable cycle is more than 210 cycles.

Embodiment 3

[0070] Compared with Example 1, the only difference is that the film-forming pressure is changed to 10MPa, and the electrochemical performance is measured by the method of Example 1. The result is: the average Coulombic efficiency is 98.1%, and it can cycle stably for more than 370 cycles.

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Abstract

The invention belongs to the technical field of lithium metal batteries, and particularly discloses a preparation method of a metal oxide composite self-supporting heat-conducting carbon film. The method comprises the following steps of (1) cracking a polymer to obtain a polymer carbon material, mixing the polymer carbon material with graphene, and pressing to form a film, namely obtaining the self-supporting heat-conducting carbon film; and (2) carrying out coordination reaction on a solution containing the self-supporting heat-conducting carbon film, an M metal source and an organic ligand to obtain a metal organic framework-self-supporting heat-conducting carbon film material, and then carrying out carbonization treatment to obtain the self-supporting metal oxide composite heat-conducting carbon film. The invention also provides a negative electrode obtained by filling the metal oxide composite self-supporting heat-conducting carbon film with lithium and an application method of thenegative electrode in a lithium metal battery. The material obtained by the technical scheme provided by the invention has excellent performance, and can significantly improve the long cycle performance of the lithium metal battery.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage negative electrodes, in particular to a lithium metal negative electrode material. Background technique [0002] The successful commercialization of lithium-ion batteries has greatly promoted the progress of battery technology and the convenience of people's lives. However, with the growing demand for high capacity and flexibility of portable batteries, the development of flexible batteries with higher energy density has become a key scientific issue in the field of energy storage technology. Lithium metal is considered as an ideal high-energy secondary battery material due to its high theoretical specific capacity and low electrochemical potential. What is different from the anode of a conventional lithium-ion battery is the intercalation and extraction of lithium ions in the graphite anode; the charging and discharging process of the lithium metal battery anode is the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/134H01M4/1395H01M10/052H01M4/62
CPCH01M4/0452H01M4/0469H01M4/134H01M4/1395H01M4/625H01M10/052Y02E60/10
Inventor 张治安谢杨洋张伟徐靖宇赖延清李劼张凯
Owner CENT SOUTH UNIV
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