High-voltage electrolyte and lithium-ion battery based on it
A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of battery cycle performance decline, temperature rise, internal pressure increase, etc., to suppress high-temperature gas production, reduce dissolution, and suppress gas production Effect
Active Publication Date: 2021-12-14
远景动力技术(湖北)有限公司 +1
View PDF19 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The electrolyte system composed of conventional carbonate solvent and lithium hexafluorophosphate will decompose when it is above 4.5V, resulting in increased internal pressure, increased temperature, decreased battery cycle performance, and rapid capacity decay
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0050] Preparation of lithium-ion secondary battery:
[0051] The positive electrode active material LiNi 0.5 co 0.2 mn 0.3 o 2 (LNCM), conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed in N-methylpyrrolidone solvent system in a mass ratio of 95:3:2, and then coated on aluminum foil and dried. , cold pressing to obtain the positive electrode sheet, the compacted density is 3.45g / cm 3 .
[0052] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener carbon methyl cellulose sodium (CMC) are in the deionized water solvent system according to the mass ratio of 96:2:1:1 After fully stirring and mixing evenly, it is coated on Cu foil, dried, and cold-pressed to obtain a negative electrode sheet with a compacted density of 1.65g / cm 3 .
[0053] Use polyethylene (PE) with a thickness of 9 μm as the base film, and coat the base film with a nano-alumina coating of 3 μm to ...
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
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a high-voltage electrolyte and a lithium ion battery based on it. The high-voltage non-aqueous electrolyte of the invention includes an electrolyte lithium salt, a non-aqueous organic solvent, a first additive and a second additive, and the electrolyte lithium salt includes lithium hexafluorophosphate and lithium hexafluorophosphate. Auxiliary lithium salts, the auxiliary lithium salts include lithium difluorophosphate, lithium difluorooxalatephosphate and lithium tetrafluoroborate, the first additive includes difluoroethyl acetate, the second additive includes fluoroethylene carbonate and / or 1, 3-propene sultone. The invention also discloses the application of the above-mentioned electrolytic solution in the preparation of the lithium-ion battery, and the charging voltage of the lithium-ion battery is below 5.5V. The electrolyte solution of the present invention has better oxidation resistance, high temperature resistance and safety characteristics, and can suppress the high-temperature gas production of lithium-ion batteries. The high-energy-density battery using the electrolyte has good circulation and safety at high pressure and high temperature. performance.
Description
technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage electrolyte and a lithium ion battery based thereon. Background technique [0002] Lithium-ion batteries are widely used in the field of 3C consumer electronics products such as mobile phones and notebook computers due to their advantages such as high specific energy, no memory effect and long cycle life. And the application in the field of energy storage will also become more and more common. With the increase of the mileage of electric vehicles and the gradual reduction of state subsidies, the requirements for the energy density of power batteries are getting higher and higher, and increasing the working voltage of lithium-ion batteries is also one of the important ways to increase the energy density of batteries. [0003] At present, a variety of high-voltage cathode materials have been developed, but conventional electrolytes are prone to side re...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 李轶余乐陶亮
Owner 远景动力技术(湖北)有限公司