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

A high-voltage lithium-ion battery

A lithium-ion battery, high-voltage technology, applied in the direction of battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of deteriorating battery performance, inhibit reduction and decomposition, improve high-temperature storage and high-temperature cycle performance, Dissolution inhibition effect

Active Publication Date: 2022-03-29
SOUTH CHINA UNIV OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume expansion and contraction of Si material up to 300% during the charge and discharge process leads to the continuous destruction and repair of the SEI film, thereby rapidly deteriorating the battery performance

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 high-voltage lithium-ion battery
  • A high-voltage lithium-ion battery
  • A high-voltage lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-voltage lithium-ion battery comprising a positive electrode, a diaphragm, a negative electrode and an electrolyte, the positive electrode comprising LiCoO coated with a layer of tungsten trioxide nanoparticles on the surface 2 active material, the LiCoO 2 Based on the total mass of tungsten trioxide, the mass percentage of said tungsten trioxide is 0.05%;

[0028] The negative electrode comprises graphite / SiO composite active material,

[0029] The electrolyte comprises organic solvent, lithium salt and additives shown in structural formula 1, structural formula 2 and structural formula 3, the additive shown in structural formula 1 accounts for 5% of the total mass of the electrolyte, and the additive shown in structural formula 2 accounts for 1% of the total mass of the electrolyte %, the additive shown in structural formula 3 accounts for 1% of the total mass of the electrolyte,

[0030] The charging cut-off voltage of the lithium ion battery is greater than ...

Embodiment 2～15 and comparative example 1～18

[0045] Embodiments 2-15 and Comparative Examples 1-18 are used to illustrate the lithium ion battery disclosed by the present invention and the preparation method thereof, including most of the operating steps in Example 1. The difference is: 1) the electrolyte Preparation: the types and mass ratios of organic solvents, the types and mass percentages of additives are listed in Table 1. 2) Preparation of cathode material: LiCoO 2 The types and mass percentages of the coating layer on the surface are listed in Table 1. 3) Preparation of negative electrode material: See Table 1 for SiO mass percentage content.

[0046] Battery performance test:

[0047] The following performance tests were performed on the batteries prepared and formed in Comparative Examples 1-18 and Examples 1-15 above:

[0048] Battery cycle performance test at 45°C

[0049] 45°C cycle performance test: After the formed battery was stored in an oven at 45°C for 6 hours, it was charged to 4.45V at a constan...

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
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-voltage lithium-ion battery. The lithium-ion battery comprises a positive pole, a negative pole, a diaphragm and an electrolytic solution. The positive electrode comprises LiCoO coated with a modified substance on the surface 2 Active material, the negative electrode contains graphite / SiO composite active material, and the electrolyte contains organic solvent, lithium salt and additives. The additives in the electrolyte can form a high-temperature-resistant passivation film on the surface of the positive electrode, and at the same time cooperate with the metal oxide on the surface of the positive electrode material to stabilize the passivation film, inhibit the oxidative decomposition of the electrolyte and the dissolution of Co ions, and form SEI on the surface of the negative electrode Membrane, to slow down the high temperature storage and high temperature cycling process of LiCoO 2 Side reactions at the cathode and graphite / SiO anode interface occur, thereby improving the high-temperature storage and high-temperature cycle performance of high-voltage lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a high-voltage lithium-ion battery with a charging cut-off voltage greater than 4.4V. Background technique [0002] Due to its high energy density, high power, long cycle life and no memory effect, lithium-ion batteries are widely used in the field of 3C consumer electronics products, such as portable electronic products such as notebook computers, smart phones, and digital cameras. [0003] With the development of the market, consumers have put forward higher requirements for the energy density of lithium-ion batteries. To increase the energy density of lithium-ion batteries, one of the most effective ways is to use high-voltage positive electrode materials or negative electrode materials with higher specific capacity. LiCoO 2 Due to the advantages of mature technology and high energy density, it is currently the most widely used cathode material in consumer lithium-ion ba...

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): H01M4/36H01M4/525H01M4/62H01M10/0525H01M10/0567H01M10/42B82Y30/00
CPCH01M4/366H01M4/628H01M4/525H01M10/0525H01M10/0567H01M10/4235B82Y30/00H01M2004/028Y02E60/10
Inventor 胡时光王朝阳雷志文邓永红
Owner SOUTH CHINA UNIV 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