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Three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and preparation method thereof

A lithium metal, self-supporting technology, applied in the direction of battery electrodes, lithium batteries, nanotechnology for materials and surface science, etc., can solve the problems of lithium metal volume change, deposition of dendrites, lack of protection methods, etc., to achieve life expectancy The effect of long life, high safety and good cycle stability

Inactive Publication Date: 2018-03-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing carrier materials often do not pay attention to this
[0005] In summary, metal lithium in the metal lithium negative electrode in the prior art is prone to deposit dendrite behavior, and the volume of metal lithium is prone to change during the cycle, and there is still a lack of effective protection methods

Method used

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  • Three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and preparation method thereof
  • Three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and preparation method thereof
  • Three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of a three-dimensional self-supporting lithiophilic carrier

[0049] The commercial melamine foam was ultrasonically cleaned in acetone, deionized water and ethanol in sequence, and then cleaned at 3 °C min in a high-purity nitrogen atmosphere. -1 The heating rate was raised to 900°C for carbonization of lithium, and the temperature was kept for 1 hour to obtain a three-dimensional self-supporting nitrogen-rich carbon sponge. Most of the high nitrogen content in the carrier exists in the form of pyrrole nitrogen and pyridine nitrogen. These nitrogen-containing functional groups have a relatively strong relationship with lithium High binding energy, with lithium-philic properties.

[0050] (2) Preparation of metal lithium anode encapsulated by three-dimensional self-supporting lithium-philic carrier

[0051] The above-mentioned three-dimensional self-supporting nitrogen-rich carbon sponge carrier was cut into the desired shape as the working electrode, a...

Embodiment 2

[0060] (1) Preparation of a three-dimensional self-supporting carrier

[0061] The commercial melamine foam was ultrasonically cleaned in acetone, deionized water and ethanol in sequence, and then heated at 5 °C for min in a high-purity nitrogen atmosphere. -1 The heating rate was increased to 950°C for carbonization of lithium, and the temperature was maintained for 1 hour to obtain a three-dimensional self-supporting nitrogen-rich carbon sponge. Most of the high nitrogen content in the carrier exists in the form of pyrrole nitrogen and pyridine nitrogen. These nitrogen-containing functional groups have a relatively strong relationship with lithium High binding energy, with lithium-philic properties.

[0062] (2) Preparation of metal lithium anode encapsulated by three-dimensional self-supporting lithium-philic carrier

[0063] The above-mentioned three-dimensional self-supporting nitrogen-rich carbon sponge carrier was cut into the desired shape as the working electrode, an...

Embodiment 3

[0066] (1) Preparation of a three-dimensional self-supporting carrier

[0067] The commercial melamine foam was ultrasonically cleaned in acetone, deionized water and ethanol in sequence, and then cleaned at 3 °C min in a high-purity nitrogen atmosphere. -1 The heating rate was raised to 900°C for carbonization of lithium, and the temperature was kept for 1 hour to obtain a three-dimensional self-supporting nitrogen-rich carbon sponge. Most of the high nitrogen content in the carrier exists in the form of pyrrole nitrogen and pyridine nitrogen. These nitrogen-containing functional groups have a relatively strong relationship with lithium High binding energy, with lithium-philic properties.

[0068] (2) Preparation of metal lithium anode encapsulated by three-dimensional self-supporting lithium-philic carrier

[0069] The above-mentioned three-dimensional self-supporting nitrogen-rich carbon sponge carrier was cut into the required shape as the working electrode, and the metal...

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Abstract

The invention discloses a three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode and a preparation method thereof. The three-dimensional self-supported lithium-loving carrier-packaged metal lithium composite negative electrode comprises the following steps of 1) carbonizing melamine foam in an inertia atmosphere to obtain a nitrogen-rich lithium-loving three-dimensional self-supported carrier; and 2) packaging metal lithium in holes of the three-dimensional self-supported carrier to obtain the metal lithium composite negative electrode. Carbon sponge obtained by carbonization of melamine foam is used as a metal lithium carrier, and the metal lithium composite negative electrode has effects of guiding metal lithium to be uniformly deposited and preventing dendrite from being generated. Lithium-loving functional groups are uniformly arranged on the carrier, a lithium-loving coating layer is deposited on a hole surface of the carrier, the lithium-loving performance of the carrier is improved, the volume change of the metal lithium electrode during the circulation process is effectively buffered, moreover, the lithium-loving functional groups uniformly arranged on the three-dimensional carrier are used as active sites for metal lithium deposition, the nucleation over-potential is reduced, uniform nucleation of metal lithium can be effectively controlled, so that the dendrite generation is prevented.

Description

Technical field [0001] The present invention relates to the preparation of battery electrode materials, and specifically relates to a three-dimensional self-supporting lithiophilic carrier-encapsulated metal lithium composite negative electrode and its preparation method. Background technique [0002] In recent years, with the rapid development of electric vehicles and high-end portable electronic devices, the demand for high-energy-density batteries has become increasingly urgent. Lithium metal up to 3860mAhg -1 Its ultra-high specific capacity and lowest electrochemical potential (-3.04V compared to standard hydrogen electrode) make it the ultimate negative electrode for high-energy-density lithium batteries. In addition, lithium metal batteries, represented by lithium-sulfur batteries and lithium-air batteries, are currently considered the most promising next-generation energy storage systems. However, despite the great advantages of metallic lithium anodes, its safety ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/382H01M4/625H01M10/052Y02E60/10
Inventor 慈立杰侯广梅
Owner SHANDONG UNIV
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