Unlock instant, AI-driven research and patent intelligence for your innovation.

A method of controlling lithium deposition by solution slow release

A technology of lithium deposition and slow release, which is applied in the direction of lithium battery, final product manufacturing, electrolyte battery manufacturing, etc. It can solve the problems of limited application range, poor wettability, high viscosity, etc., to improve performance, slow down consumption, and reduce specific surface area Effect

Active Publication Date: 2022-03-18
BEIJING NORMAL UNIVERSITY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-concentration lithium salt electrolytes usually have relatively high viscosity and poor wettability, and can only be used for specific ether solvent systems, so the scope of application is limited

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
  • A method of controlling lithium deposition by solution slow release
  • A method of controlling lithium deposition by solution slow release
  • A method of controlling lithium deposition by solution slow release

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] In a specific embodiment, the method also includes the preparation of a positive electrode sheet for a lithium metal battery containing a component that is slightly soluble in an electrolyte solution for a lithium metal battery, and the preparation of the positive electrode sheet for a lithium metal battery is The method includes the following steps:

[0051] (1) uniformly mixing the positive electrode active material, the conductive agent, the binder and the slightly soluble components in the electrolyte solution for lithium metal batteries to prepare the positive electrode slurry;

[0052] (2) Coating the positive electrode slurry on one or both surfaces of the current collector to obtain the positive electrode sheet.

[0053] In a specific embodiment, the diaphragm for lithium metal batteries includes a diaphragm base layer and a coating layer on one or both sides of the diaphragm base layer, and the coating layer includes a component that is slightly soluble in the ...

Embodiment 1

[0080] Step 1) Mix 85 parts of the positive active material lithium iron phosphate (parts by mass, the same as below), 5 parts of acetylene black, 5 parts of conductive graphite, 3 parts of PVDF, and 2 parts of cerium carbonate with N-methylpyrrolidone to obtain a positive electrode slurry ;

[0081] Step 2) coating the positive electrode slurry scraper of step 1) on one side of the aluminum foil current collector;

[0082] Step 3) drying the aluminum foil current collector coated with positive electrode slurry in step 2) to prepare a positive electrode sheet containing slightly soluble component cerium carbonate; the surface density of the positive electrode sheet is 13 mg / cm 2 .

[0083] Step 4) Assemble the lithium metal battery:

[0084] Add commercial ester lithium metal battery electrolyte (LiPF 6 The ester electrolyte with a concentration of 1M, in which the volume ratio of dimethyl carbonate and diethyl carbonate is 1:1) 70 μL, put in the reed and seal with a hydrau...

Embodiment 2

[0087] Other steps are with embodiment 1, and difference is only in:

[0088] Step 1) Fully mix 83 parts of lithium manganate, 5 parts of acetylene black, 5 parts of conductive graphite, 3 parts of PVDF, and 4 parts of tin difluoride with N-methylpyrrolidone to obtain a positive electrode slurry;

[0089] The button lithium metal battery was subjected to a cycle charge and discharge test, and the performance of the battery is shown in Table 1.

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

No PUM Login to View More

Abstract

The invention provides a method for controlling lithium deposition through solution slow release, the method is by adding components that can be slightly soluble in the electrolyte solution for lithium metal batteries in the positive electrode sheet or diaphragm, after the battery is assembled, the lithium The surface reduction forms lithium nucleation sites, promotes the uniform deposition of lithium, and forms bulk lithium without forming dendrites, thereby reducing the specific surface area of ​​the lithium deposition layer, slowing down the consumption of the electrolyte, and improving the performance of the lithium metal battery. Compared with the method in the prior art that uses a high lithium salt concentration electrolyte to avoid the generation of lithium dendrites, the method of the present application can be applied to various electrolyte systems without using high concentration lithium salt.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and in particular relates to a method for controlling lithium deposition through solution slow release. Background technique [0002] Due to the mileage limitation in the use of pure electric vehicles, lithium metal batteries with high specific energy are urgently needed to improve the cruising range. The development of high specific energy lithium metal batteries relies on the development of new positive electrode materials such as high nickel on the one hand, and on the other hand the development of new negative electrode materials, such as silicon carbon negative electrodes and lithium metal negative electrodes. Li metal anode has a high theoretical specific capacity (3840mAh / g), low potential (-3.04V vs SHE) and the smallest density among metals (0.534g / cm 3 ), which may be used in the next generation of lithium metal batteries with higher specific capacity. [0003] However...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/42H01M10/058
CPCH01M10/4235H01M10/052H01M10/058Y02P70/50Y02E60/10
Inventor 周建军闫俊李林
Owner BEIJING NORMAL UNIVERSITY