Framework material for lithium metal battery negative electrode and preparation method of framework material as well as lithium metal battery negative electrode

A technology for lithium metal batteries and skeleton materials, applied in the direction of electrode carriers/collectors, secondary batteries, circuits, etc., can solve the problems of lithium metal and electrolyte consumption, low electrode potential, complex preparation methods, etc., and achieve improved cycle stability The effect of stability, stable charge and discharge voltage, and simple method

Active Publication Date: 2018-08-28
UNIV OF SCI & TECH OF CHINA
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium metal has up to 3860mAh·g -1 The specific capacity is much higher than that of traditional lithium-ion batteries, and it has the advantages of lower electrode potential (-3.04V vs standard hydrogen electrode), which is an ideal next-generation battery; but lithium metal is directly used as the negative electrode, in practical applications There are still urgent problems to be solved: (1) Li dendrites will form due to the uneven deposition / dissolution of Li during the charge-discharge cycle; Li dendrites will pierce the separator during the growth process, resulting in short circuits inside the battery, Thus causing safety problems; (2) The formation of lithium dendrites will cause the metal lithium negative electrode to expand infinitely, and the broken lithium dendrites will form "dead lithium" at the same time; and the active lithium metal will also react with most of the organic electrolyte The formation of SEI leads to the consumption of lithium metal and electrolyte, resulting in the decrease of Coulombic efficiency of the battery, poor cycle and other adverse effects
However, the preparation methods of the existing framework materials are complicated and the raw materials are expensive, which is not conducive to large-scale production.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Framework material for lithium metal battery negative electrode and preparation method of framework material as well as lithium metal battery negative electrode
  • Framework material for lithium metal battery negative electrode and preparation method of framework material as well as lithium metal battery negative electrode
  • Framework material for lithium metal battery negative electrode and preparation method of framework material as well as lithium metal battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The invention provides a method for preparing a lithium metal battery negative electrode framework material, comprising the following steps:

[0034] a), mixing the soybean product and the KOH solution, and ultrasonically obtaining the precursor solution;

[0035] b), freezing the precursor solution with liquid nitrogen and then vacuum freeze-drying to obtain a layered precursor;

[0036] c) activating and carbonizing the layered precursor at 700-800° C. to obtain a lithium metal battery negative electrode framework material.

[0037] The preparation method provided by the invention uses abundant and cheap soy product biomass as a raw material, and through one-step activation and carbonization, the method is simple and easy, and the raw materials are widely and easily available; The anode material of the metal battery can improve the cycle stability of the battery.

[0038] The present invention mixes soybean product and KOH solution, and ultrasonically obtains precur...

Embodiment 1

[0065] (1) Weigh a certain amount of fresh tofu, wash it three times with deionized water at room temperature, put it in a 500mL petri dish, put it in the freezing layer of the refrigerator (-18°C) and take it out after freezing for 24 hours; then put it in Dry in a vacuum freeze dryer to form loose dried tofu. The temperature of the freeze dryer is -70°C and the air pressure is 10Pa;

[0066] (2) Weigh 15g of dry tofu obtained in step (1) and put it into 150mL, the mass concentration is 10mg mL -1 In the KOH aqueous solution, the mass ratio of dry tofu to activator is 5:1; mix in an ultrasonic machine to obtain a homogeneous precursor solution; the ultrasonic working frequency is 53kHz, the ultrasonic time is 30min, and the ultrasonic temperature is 30°C;

[0067] (3) Package the precursor solution obtained in step (2) in a beaker with plastic wrap, put it in liquid nitrogen, take it out after 20 minutes, put it in a vacuum freeze dryer, and take out the loose and porous prec...

Embodiment 2

[0072] The difference from Example 1 is that the mass ratio of KOH to dried tofu is 3:5.

[0073] The present invention has carried out X-ray photoelectron energy spectrum analysis (XPS) to the lithium metal battery negative pole framework material prepared in Example 2, and the C content of lithium metal battery negative pole framework material is 95wt%, and N content is 0.82wt% and O content 4.18 wt%. The test results show that the heteroatom-doped chemical properties of the lithium metal battery anode framework material provide abundant lithium-friendly sites.

[0074] image 3 The nitrogen adsorption and desorption curve of the lithium metal battery negative electrode framework material prepared in Example 2 of the present invention; its specific surface area is as high as 3134m 2 g -1 .

[0075] Figure 4 The pore size distribution diagram of the lithium metal battery negative electrode framework material prepared in Example 2 of the present invention; the mesopores ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Discharge current densityaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a framework material for a lithium metal battery negative electrode and a preparation method of the framework material and the lithium metal battery negative electrode. The method comprises the following steps: mixing a soybean product with a KOH solution and carrying out ultrasonic treatment; carrying out liquid nitrogen freezing on the obtained precursor solution and thencarrying out vacuum freeze-drying to obtain a lamellar precursor; finally, carrying out activated carbonization at the temperature of 700 to 800 DEG C to obtain the framework material for the lithiummetal battery negative electrode. By adopting the method, soybean product biomass and a one-step activation carbonization mode, the method is simple and feasible, and raw materials are wide in sourceand easily obtained; in addition, the cycle stability of the battery is improved by taking the soybean product biomass as a negative electrode material of the lithium metal battery. The framework material for the lithium metal battery negative electrode has higher surface area, narrow pore size distribution and large amount. The framework material for the lithium metal battery negative electrodehas the characteristics that the specific surface area reaches as high as 3134m<2>.g<-1>; the mesoporous is 2.2 to 2.8nm and micropore are concentrated between 0.8nm and 1.4nm; after charge-dischargecycle of the lithium metal battery cycle for dozens of circles, stable charge-discharge voltage is still maintained and the polarization phenomenon is almost avoided.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a lithium metal battery negative electrode framework material, a preparation method thereof, and a lithium metal battery negative electrode. Background technique [0002] In order to better meet the development of human society, new energy storage devices have become a research hotspot. Lithium metal has up to 3860mAh·g -1 The specific capacity is much higher than that of traditional lithium-ion batteries, and it has the advantages of lower electrode potential (-3.04V vs standard hydrogen electrode), which is an ideal next-generation battery; but lithium metal is directly used as the negative electrode, in practical applications There are still urgent problems to be solved: (1) Li dendrites will form due to the uneven deposition / dissolution of Li during the charge-discharge cycle; Li dendrites will pierce the separator during the growth process, resulting in shor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/64H01M4/66H01M10/0525
CPCH01M4/64H01M4/66H01M10/0525Y02E60/10
Inventor 朱彦武孙学梅
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap