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

A high-voltage lithium-ion battery

A lithium-ion battery, high-voltage technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of poor fluidity of solid electrolyte, insufficient charge and discharge at high rates, and low ion mobility, etc., to achieve pro- Excellent compatibility, improved interface performance, and good compatibility

Active Publication Date: 2022-06-07
SOUTH CHINA NORMAL UNIVERSITY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak fluidity of the solid electrolyte, low ion mobility, and high interface impedance, it is obviously not enough for high-rate charge and discharge. At the same time, the cost of materials is relatively high, and the road to commercialization is "resistance and long".

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 0.4g PVDF, 0.04g polyvinylpyrrolidone, 0.004g benzoic acid in a 20ml beaker, add 2.3mL N-methylpyrrolidone, stir magnetically in a 60°C water bath until completely dissolved, and the solution is clear and transparent. Then pour the solution on the smooth surface of the aluminum foil, then apply it with a 100um scraper, let it stand for 5 minutes, soak it in 500 mL of distilled water by the phase transfer method, soak it for 24 hours, take it out, and place it in a vacuum drying oven at 60 °C for more than 8 hours. Cut to a 14mm diameter diaphragm. The prepared diaphragms were placed in the glove box. After each diaphragm was activated with 1 mL of n-butyllithium for 12 hours, it was taken out and washed with n-hexane and dimethyl carbonate respectively, and waited for 3 hours to make the solvent evaporate completely.

[0022] With lithium nickel manganate as the positive electrode, graphite as the negative electrode, the electrolyte is 1mol L -1 LiPF 6 It is obt...

Embodiment 2

[0025] With reference to Example 1, the difference is that the additive is terephthalic acid;

Embodiment 3

[0027]Referring to Example 1, the difference is that the additive is trimesic acid.

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 a high-voltage lithium-ion battery, which adopts a lithiated porous PVDF (polyvinylidene fluoride)-based diaphragm, which can absorb and absorb electrolyte oxidation products from a high-voltage positive electrode, so as to prevent them from migrating to the negative electrode and ensure that the negative electrode It can normally intercalate and remove lithium ions to improve the cycle life of the battery. In addition, because the porous PVDF separator has good compatibility with carbonate electrolytes, it will also improve the interface performance of the electrode / electrolyte.

Description

Technical field: [0001] The invention relates to a lithium ion battery, in particular to a high voltage lithium ion battery. Background technique: [0002] Lithium-ion battery cathode material lithium nickel manganate (LiNi 0.5 Mn 1.5 O 4 ) with high voltage (4.9V, vs Li / Li+), high energy density (650W.h / Kg), and long cycle life, it is considered as a potential cathode material for future development. The working voltage of the lithium-ion battery composed of it and the carbon negative electrode can reach about 4.6V, and the energy density is 20-30% higher than that of the commonly used lithium-ion battery. However, because the current commercial carbonate electrolyte will be oxidized and decomposed on the high-voltage positive electrode, the decomposition products will migrate to the negative electrode and be reduced, so that the negative electrode cannot normally intercalate and desorb lithium ions, which eventually causes the battery capacity to decay rapidly. [0003...

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): H01M50/417H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 吕东生伍思泳李灿煌丘奕靖
Owner SOUTH CHINA NORMAL UNIVERSITY