Unlock instant, AI-driven research and patent intelligence for your innovation.
Composite current collector, preparation method thereof, electrode and lithium ion battery
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of lithium-ion batteries and current collectors, applied in the direction of electrode carriers/collectors, battery electrodes, secondary batteries, etc., can solve problems such as explosion, and achieve the effect of reducing battery internal resistance and good battery capacity stability
Active Publication Date: 2019-04-19
SOUNDON NEW ENERGY TECH CO LTD
View PDF7 Cites 4 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
The current collectors of lithium-ion batteries are mostly copper foil and aluminum foil, and the battery capacity stability of lithium-ion batteries based on this needs to be improved; in addition, the current lithium-ion batteries are explosive in high-temperature environments, so their The ambient storage temperature is best below 35°C
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
preparation example Construction
[0030] One embodiment of the present invention provides a method for preparing any one of the above composite current collectors, comprising the following steps S1-S2.
[0031] Step S1: mixing nano-bismuth, nano-bismuth oxide, a binder and a conductive agent in a solvent to obtain a slurry.
[0032] The raw materials are provided according to the composition of the surface coating of a composite current collector as described above. For example, in one of the embodiments, the mass ratio of nano-bismuth, nano-bismuth oxide, binder and conductive agent is (6-8):(0.5-1.5):(0.1-0.5):(0.1-0.5).
[0034] It can be understood that nanobismuth can be obtained through the reaction of soluble bismuth salt and reducing agent. Specifically, for example, bismuth nitrate reacts with sodiumborohydride to obtain nanobismut...
[0050] (2) According to the molar ratio of sodiumborohydride and bismuth nitrate 3:1, sodium borohydride was added dropwise to the bismuth nitrate solution, and after the dropwise addition was completed, stirring was continued for 5 minutes at a speed of 1000 rpm. After the product was washed with deionized water, Dry in a drying oven at 100°C to constant weight to prepare nanobismuth.
[0051] (3) Mixing nano-bismuth, nano-bismuth oxide, a binder, and a conductive agent in a solvent at a mass ratio of 8.5:1.0:0.4:0.1 to obtain a slurry containing nano-bismuth and nano-bismuth oxide. The slurry was then coated on the surface of the copper foil, and dried in an oven at 90° C. to a constant weight to obtain a composite current collector. Wherein the coating thickness is less than 2 microns. Wherein, the binde...
Embodiment 2
[0052] Example 2 The steps for preparing the composite current collector are basically the same as in Example 1, except that the mass ratio of nanobismuth, nanobismuth oxide, binder, and conductive agent in step (3) is 6:1.5:0.5:0.5 ; The binder is styrene-butadiene latex and sodium carboxymethyl cellulose, and the conductive agent is acetylene black.
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
Particle size
aaaaa
aaaaa
Particle size
aaaaa
aaaaa
Thickness
aaaaa
aaaaa
Login to View More
Abstract
The invention relates to a composite current collector, a preparation method thereof, an electrode and a lithiumion battery. The composite current collector comprises a current collector and a surface coating formed on the current collector, and the surface coating comprises nano bismuth, nano ceriumoxide, binder and conductive agent. The nano ruthenium in the surface coating of the composite current collector is of the order of nanometers, so the contact area of the active material in the current collector and the active material layer, thereby reducing the internal resistance of the interface, and improving the stability of the battery capacity. The melting point of the nano bismuth is low, so the nano bismuth can be melted when the lithiumion battery is heated, and the contact between the active materials and the current collector is cut off, thereby cutting off the conductive path to avoid further thermal runaway. The compatibility of nano bismuth and nano bismuth oxide is good.The nano bismuth oxide with the flame retardant effect in the composite current collector can cooperate with the nano bismuth so as to achieve the functions of inhibiting the combustion of the battery and preventing explosion of the lithiumion battery when the heating temperature of the lithium ion battery increases, so the safety performance of the battery is further improved.
Description
technical field [0001] The invention relates to the technical field of batteries, and specifically relates to a composite current collector, a preparation method thereof, an electrode and a lithium ion battery. Background technique [0002] With the rapid development of the new energy industry, the requirements for electrochemical equipment are also increasing. On the one hand, it requires high energy density, fast charge and discharge and other electrochemical performance; on the other hand, it pursues high safety performance. The current collector is an important part of the lithium-ion battery, which refers to the mechanical carrier that carries the positive or negative active materials, and can provide migration channels for electrons. The current collectors of lithium-ion batteries are mostly copper foil and aluminum foil, and the battery capacity stability of lithium-ion batteries based on this needs to be improved; in addition, the current lithium-ion batteries are e...
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