Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method and application of nanometer LiF/Fe/graphite positive electrode lithium supplementing slurry

A cathode and graphite technology, applied in the field of energy materials, can solve problems such as low coulomb efficiency for the first time, and achieve the effects of simple production process, low cost, and clean and environmentally friendly preparation process.

Inactive Publication Date: 2019-08-27
HARBIN INST OF TECH
View PDF7 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of low initial coulombic efficiency of existing lithium-ion batteries, and provides a preparation method and application of nano-LiF / Fe / graphite cathode lithium supplement slurry, which contains high specific capacity LiF / Fe and high-conductivity graphite The positive electrode lithium supplement slurry can be obtained by high-energy ball milling, which is simple and easy

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
  • Preparation method and application of nanometer LiF/Fe/graphite positive electrode lithium supplementing slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix 7 g LiF, 5 g Fe powder, and 1 g graphite evenly;

[0023] (2) Add 20 ml of absolute ethanol to the evenly mixed powder, stir evenly and transfer the slurry to a high-energy ball mill tank for high-energy ball milling for 2 h;

[0024] (3) Add LiFPO dropwise to the nano-LiF / Fe / graphite positive electrode lithium supplement slurry obtained after ball milling 4 The surface of the positive electrode sheet (mass fraction is about 5%) is coated with a coater with a thickness of 5 µm, and can be used as a lithium-ion battery positive electrode after drying at 100 °C.

Embodiment 2

[0026] (1) Mix 7 g LiF, 5 g Fe powder, and 1 g graphite evenly;

[0027] (2) Add 20 ml of absolute ethanol to the evenly mixed powder, stir evenly and transfer the slurry to a high-energy ball mill tank for high-energy ball milling for 4 h;

[0028] (3) Add LiFPO dropwise to the nano-LiF / Fe / graphite positive electrode lithium supplement slurry obtained after ball milling 4 The surface of the positive electrode sheet (mass fraction is about 5%) is coated with a coater with a thickness of 5 µm, and can be used as a lithium-ion battery positive electrode after drying at 100 °C.

Embodiment 3

[0030] (1) Mix 7 g LiF, 5 g Fe powder, and 1 g graphite evenly;

[0031] (2) Add 20 ml of absolute ethanol to the evenly mixed powder, stir evenly and transfer the slurry to a high-energy ball mill tank for high-energy ball milling for 8 h;

[0032] (3) Add LiFPO dropwise to the nano-LiF / Fe / graphite positive electrode lithium supplement slurry obtained after ball milling 4 The surface of the positive electrode sheet (mass fraction is about 5%) is coated with a coater with a thickness of 5 µm, and can be used as a lithium-ion battery positive electrode after drying at 100 °C.

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method and an application of nanometer LiF / Fe / graphite positive electrode lithium supplementing slurry; the method comprises the following steps of 1, performingmixing and uniform stirring on LiF, Fe powder and graphite; and step 2, enabling the uniformly mixed LiF, Fe powder and graphite to be added into absolute ethyl alcohol and then transferring the mixture into a high-energy ball milling tank, and carrying out high-energy ball milling under the protection of inert gas to obtain the nanometer LiF / Fe / graphite positive electrode lithium supplementing slurry. By adoption of the method, the obtained nanometer LiF / Fe / graphite positive electrode lithium supplementing slurry can be applied to a lithium ion battery positive electrode for lithium supplementing. After the lithium ion battery is charged to 4.5V for the first time, LiF reacts with Fe to generate FeF3, and Li+ is released; and when the lithium ion battery is discharged to 3.0V, FeF3 does not return to LiF and Fe, and the redundant Li+ is used for compensating Li+ consumption caused by formation of an SEI membrane and lithium loss in subsequent circulation. The preparation method disclosed by the invention is low in raw material cost and simple in preparation process, and the preparation process is clean and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of a LiF / Fe positive electrode lithium supplement slurry, in particular to a preparation method and application of a nano LiF / Fe / graphite positive electrode lithium supplement slurry. Background technique [0002] At present, in the first charging and discharging process of lithium-ion batteries using graphite or silicon carbon as the negative electrode, about 10% of the active lithium in the positive electrode will be consumed, and an irreversible and stable SEI film will be formed on the surface of the negative electrode, resulting in irreversible capacity loss, thereby reducing energy density of lithium-ion batteries. The researchers hope that this part of the irreversible capacity loss can be eliminated by supplementing lithium. Usually, a part of metal lithium powder is supplemented on the surface of the negative electrode, but it...

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 Applications(China)
IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 范立双张奇张乃庆
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com