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

Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery containing electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of designing lithium-ion batteries, can solve problems such as battery capacity attenuation, achieve the effect of reducing reduction decomposition and prolonging cycle life

Inactive Publication Date: 2022-03-15
湖南时代安能新能源科技有限公司
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the charge / discharge process of the silicon carbon negative electrode, there will be severe volume expansion / contraction, so that the silicon carbon negative electrode material will continuously generate new surfaces during the cycle, and the new surface needs to consume the electrolyte to form a film, which will lead to a sharp decline in battery capacity

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
  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery containing electrolyte
  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery containing electrolyte
  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of electrolyte

[0016] The preparation of the electrolyte is carried out in a glove box filled with argon and the water and oxygen content is less than 0.01ppm. Firstly, ethylene carbonate and dimethyl carbonate are mixed at a volume ratio of 3:7, and then quantitative Lithium hexafluorophosphate to obtain a solution with a concentration of 1mol / L, and finally add 2wt% borate tris(hexafluoroisopropyl) ester additive to obtain lithium-ion battery electrolyte

[0017] (2) Assembly of lithium-ion battery

[0018] The cathode active material LiCoO 2 , conductive agent (acetylene black), and binder (PVDF) were dissolved in the solvent NMP at a mass ratio of 97.5:1:1.5 and stirred for 10 hours to obtain the positive electrode slurry, which was then evenly coated on the positive electrode current collector aluminum foil and dried to obtain the positive electrode sheet; the negative electrode active material silicon-carbon composite material, conductive agent...

Embodiment 2

[0020] The difference from Example 1 is that the mass proportion of tris(hexafluoroisopropyl) borate additive in the electrolyte solution is 4%.

Embodiment 3

[0022] The difference from Example 1 is that the additive in the electrolyte is tris(2-cyanoethyl) borate.

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 discloses an electrolyte for a lithium ion battery using a silicon-carbon material as a negative electrode and the lithium ion battery containing the electrolyte. The electrolyte is composed of a lithium salt, a non-aqueous organic solvent and an additive. Wherein the additive is one or two of boric acid tri (hexafluoroisopropyl) ester and tri (2-cyanoethyl) boric acid ester. The lithium salt is at least one of LiPF6, LiBF4, LiClO4, LiTFSI and LiFSI, and preferably, the lithium salt is LiPF6; the concentration is 0.8 mol / L to 1.5 mol / L, preferably 1.0 mol / L to 1.2 mol / L. The non-aqueous organic solvent is at least two of ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate, preferably a combination of ethylene carbonate and dimethyl carbonate.

Description

Technical field: [0001] The invention relates to the field of lithium-ion batteries, and in particular relates to an electrolyte solution for lithium-ion batteries using a silicon-carbon material as a negative electrode. Background technique [0002] In recent years, lithium-ion batteries have become one of the most important electrochemical energy storage devices in people's daily life, and are widely used in portable electronic devices such as mobile phones and notebook computers. With the development of the field of electric vehicles, "range anxiety" makes consumers' demand for lithium-ion batteries with high energy density increasingly urgent. Replacing the currently commercially used graphite anode with a silicon-carbon anode with a high specific capacity can further increase the energy density of lithium-ion batteries. However, in the charge / discharge process of the silicon carbon negative electrode, there will be severe volume expansion / contraction, so that the silic...

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): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 彭小琦
Owner 湖南时代安能新能源科技有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com