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

High-voltage lithium ion battery

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

Active Publication Date: 2021-07-09
SOUTH CHINA NORMAL UNIVERSITY
View PDF4 Cites 1 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
  • High-voltage lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 0.4g PVDF, 0.04g polyvinylpyrrolidone, and 0.004g benzoic acid into 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 aluminum foil, then apply it with a 100um spatula, let it stand for 5 minutes, soak it in 500mL distilled water by phase transfer method, soak it for 24 hours, take it out, and put it in a vacuum oven at 60°C for more than 8 hours. Cut to 14mm diameter diaphragm. The prepared diaphragm was placed in a glove box, and each diaphragm was activated with 1mL of n-butyllithium for 12 hours, then taken out and washed with n-hexane and dimethyl carbonate respectively, and waited for 3 hours for the solvent to evaporate completely.

[0022] Lithium nickel manganese oxide is used as the positive electrode, graphite is used as the negative electrode, and the electrolyte is 1mol L -1 LiPF 6 It is obtained b...

Embodiment 2

[0025] Referring 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, and the diaphragm can absorb and adsorb electrolyte oxidation products from a high-voltage positive electrode so as to prevent the electrolyte oxidation products from being migrated to a negative electrode, ensure that the negative electrode can normally intercalate and deintercalate lithium ions and prolong the cycle life of the battery. In addition, due to the fact that the porous PVDF diaphragm is good in compatibility with carbonic ester electrolyte, the interface performance of the electrode / electrolyte can be improved.

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 manganese oxide (LiNi 0.5 mn 1.5 o 4 ) with high voltage (4.9V, vs Li / Li+), high energy density (650W.h / Kg), long cycle life, is considered to be a potential positive electrode 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, resulting in the negative electrode not being able to intercalate and remove lithium ions normally, and eventually causing a rapid decline in ...

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): 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