Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A lithium-ion battery and lithium salt technology, applied in the field of electrochemistry, can solve the problems of unstable ternary material structure, poor high-voltage resistance performance of the battery, and difficulty in guaranteeing safety performance, etc. The effects of excessive magnification, good high-temperature storage, and low increase rate of physical resistance
Active Publication Date: 2021-02-02
CONTEMPORARY AMPEREX TECH CO
View PDF4 Cites 8 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Lithium iron phosphate has a stable structure and low activity, which can provide high safety and long cycle life, but its platform is low and specific energy is low, and its energy density often cannot meet the growing demand for electric vehicle cruising range
The nickel-cobalt lithium manganate ternary material combines the advantages of lithium nickelate, lithium cobaltate, and lithium manganate, and has obvious advantages in life and energy density. However, the structure of the ternary material itself is not stable enough, and it is alkaline. In the electrolyte with lithium hexafluorophosphate as the main salt, the safety performance is difficult to guarantee due to the influence of trace HF in it, and thermal runaway is very easy to occur during the thermal shock process
Compared with lithium hexafluorophosphate, lithium bisfluorosulfonyl imide (LiFSI) has lower content of F element and good thermal stability, which can provide excellent battery safety, but too high content of LiFSI can easily cause high voltage resistance of the battery become worse
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0041] Preparation of positive electrode sheet:
[0042] The positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 , conductive carbon black SP and binder PVDF are dispersed into the solvent NMP and mixed evenly to obtain positive electrode slurry; the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil, and the coating weight of the positive electrode slurry is 0.309g / 1540.25 mm 2 (Based on the weight not including the solvent), after drying, cold pressing, slitting, and cutting, the positive pole sheet is obtained, wherein the mass ratio of the positive active material, conductive carbon black and binder PVDF is 96:2 :2.
[0043] Preparation of negative electrode sheet:
[0044] Disperse the negative electrode active material natural graphite, conductive carbon black SP, thickener CMC and binder SBR in the solvent deionized water according to the mass ratio of 96:1:1:2 and mix evenly to obtain the negative electr...
Embodiment 2-10 and comparative example 1-3
[0052] The preparation method of positive electrode sheet, negative electrode sheet, electrolyte and lithium ion battery in embodiment 2-10 and comparative example 1-3 is basically the same as embodiment 1, changes the coating weight of negative electrode slurry, the average grain size of negative electrode active material Diameter, manufacturing parameters such as cold pressing pressure, etc., adjust the total mass of negative active substances M A , compaction density PD A and the pole piece porosity P A , the formulations and physical parameters of each embodiment and comparative examples are shown in Table 1.
[0053] Table 1
[0054]
[0055]
[0056] testing method:
[0057] (1) Cycle performance test of lithium-ion secondary battery:
[0058] At 45°C, the fresh lithium-ion secondary batteries prepared in Examples and Comparative Examples were left for 5 minutes, charged at a constant current rate of 1C to 4.2V, then charged at a constant voltage until the curr...
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
density
aaaaa
aaaaa
particle diameter
aaaaa
aaaaa
density
aaaaa
aaaaa
Login to view more
Abstract
The invention relates to the field of electrochemistry, and particularly relates to a lithium ion battery. One aspect of the invention provides a lithium ion battery. The lithium ion battery comprisesa positive pole piece, a negative pole piece, an isolation membrane and an electrolyte, and is characterized in that the negative pole piece comprises a negative active material layer containing a negative active material, the electrolyte comprises an electrolyte lithium salt, the electrolyte lithium salt comprises a first lithium salt, the first lithium salt is selected from fluorine-containingsulfimide lithium salt, and the first lithium salt and the negative pole piece meet a relational expression (1). According to the invention, the fluorine-containing sulfimide lithium salt is used as the electrolyte of the first lithium salt, so that too fast impedance increase or too large concentration polarization of the battery can be effectively inhibited, the high-temperature advantage and the high-conductivity advantage of the fluorine-containing sulfimide lithium salt can be fully exerted, the formed battery is relatively low in floating charge physical resistance increase rate, the safety problems such as lithium precipitation in the middle and later periods of circulation are avoided, and finally the excellent properties of high safety performance, long cycle life and good high-temperature storage are achieved.
Description
technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium ion battery. Background technique [0002] Since the mass production of lithium-ion batteries at the end of the 20th century, they have been widely used in the field of consumer electronics due to their advantages such as high specific energy, no memory effect, and long cycle life. In recent years, the global environmental protection situation has become increasingly serious, and the shortage of fossil fuels has become more and more serious. Therefore, with the continuous maturity of materials and processes, lithium-ion batteries, as a clean energy source, have gradually become an important power source for automobiles. [0003] Commonly used power batteries mostly use lithium iron phosphate and nickel cobalt lithium manganate ternary materials as positive electrode active materials. Lithium iron phosphate has a stable structure and low activity, and can provide high sa...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more