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

Carbon-coated lithium supplement material and its preparation method and application

A carbon coating and carbon coating layer technology is applied in the field of carbon coating lithium-replenishing materials and their preparation, which can solve the problems of high decomposition potential of lithium-containing compounds, generation of oxygen and other by-products, and impact on battery life, etc. The effect of battery energy density, reducing decomposition potential, and compensating for irreversible lithium loss

Active Publication Date: 2021-07-23
SONGSHAN LAKE MATERIALS LAB +1
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Publication No. "CN104037418A", an invention patent application titled "A Lithium-ion Battery Positive Electrode Film and Its Preparation and Application", discloses a lithium-supplementing material based on a lithium-oxygen compound, a lithium source, and an alkyllithium. Lithium-supplementing materials can be added to the positive stage to achieve lithium-supplementing effect, but the decomposition potential of lithium-containing compounds is high, and oxygen and other by-products are generated during the decomposition process, which affects battery life

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
  • Carbon-coated lithium supplement material and its preparation method and application
  • Carbon-coated lithium supplement material and its preparation method and application
  • Carbon-coated lithium supplement material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] SiO 2 and Li 2 CO 3 Li 4 SiO 4 , as a lithium-containing compound, followed by the reducing agent CaB 6 Mixed at a weight ratio of 10:1, sintered in a tube furnace at 800°C, and fed with methane gas to prepare a carbon-coated lithium-supplementing material, the appearance of which is as follows figure 1 Shown in the scanning electron microscope photo.

[0028] During the mixing process of LFP electrode, the above-mentioned carbon-coated lithium-supplementing material is added to make a positive electrode sheet, and then assembled with a graphite negative electrode sheet to form a full battery for testing. The charging curve in the first week is as follows: figure 2 As shown, when charged to 4.5V, the lithium replenishing agent releases active lithium ions to exert the lithium replenishing capacity. Add different amounts of carbon-coated lithium-supplementing materials to the LFP electrode, and the charge-discharge capacity of the prepared battery is shown in Tabl...

Embodiment 2

[0032] Lithium oxide powder and CaB 6 Mixing and grinding at a weight ratio of 10:1, followed by sintering in a tube furnace at 800°C, and introducing methane gas to prepare a carbon-coated lithium supplement material. During the mixing process of LFP electrodes, 2wt.% of the above-mentioned carbon-coated lithium-supplementing materials were added to make positive plates, and then assembled with graphite negative plates to form a full battery. Experimental tests show that the carbon-coated lithium-supplementing materials during the first week of charging It can actually supplement active lithium for the battery.

Embodiment 3

[0034] Lithium oxide powder and CaB 6 Mixing and grinding at a weight ratio of 10:1, followed by sintering in a tube furnace at 800°C, and introducing methane gas to prepare a carbon-coated lithium supplement. In the NCM ternary electrode slurry mixing process, 2wt.% of the above-mentioned carbon-coated lithium-replenishing materials are added to make a positive electrode sheet, and then assembled with a graphite negative electrode sheet to form a full battery. Experimental tests show that the carbon-coated lithium-replenishing Lithium materials can actually supplement active lithium for batteries.

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 carbon-coated lithium supplement material and its preparation method and application. The carbon-coated lithium supplement material includes a lithium-containing compound, an inorganic non-metallic reducing agent, and is partially or completely coated on the lithium-containing compound or / or and a carbon-containing coating on the surface of an inorganic non-metallic reducing agent. The carbon-coated lithium supplement material provided by the present invention can inhibit the lithium supplement agent from agglomerating and growing during the synthesis process through carbon coating, improve the air stability and conductivity of the lithium supplement agent, and catalyze the lithium supplement agent to decompose and release lithium at a lower potential ions, increase the capacity of lithium supplementation, and achieve the effect of increasing the energy density of the battery; and the preparation process is simple, which is conducive to widespread popularization and application. Adding the carbon-coated lithium-supplementing material provided by the present invention to the positive electrode of the lithium secondary battery can compensate for the irreversible loss of lithium in the negative electrode of the first charge and discharge, and increase the energy density of the battery. The surface carbon coating can improve the activity of lithium-supplementing materials, improve air stability, and realize the large-scale application of lithium-supplementing agents in lithium-ion energy storage devices.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a carbon-coated lithium-supplementing material capable of increasing the energy density of a lithium-ion battery, and a preparation method and application thereof. Background technique [0002] Lithium-ion energy storage devices, especially lithium secondary batteries, will form a solid electrolyte interface (SEI) on the surface of the negative electrode during the first cycle, resulting in irreversible lithium loss, resulting in a decrease in the energy density of lithium-ion batteries. The new type of high-capacity alloy anode material has a low initial Coulombic efficiency (<90%), resulting in a large loss of battery capacity in the first week. Lithium supplementation is required to achieve large-scale application. [0003] Publication No. "CN1290209C", an invention patent titled "Dispersion of Lithium Metal in the Negative Electrode of a Secondary Battery", disclose...

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): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 闫勇黄学杰詹元杰武怿达马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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