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The foil was punched out to be 15 mm in diameter and pressed thereby producing a cathode.
The lithium-ion secondary battery comprises an anode, a cathode, a separator, a solvent and a nonaqueous electrolyte. In particular, the cathode collector is preferably aluminum foil and the anode collector is preferably copper foil.
The nonaqueous electrolyte used in the lithium-ion secondary battery may be an electrolyte produced by dissolving a lithium salt in a solvent. When a composite fiber is used, preferred is such a temperature range that only a component which should be heat-fused melts and the other components does not melt.
Solution to Problem The present invention has been accomplished as the results jks extensive studies to achieve the above object. Herein, the glossiness is defined as a glossiness of a non-woven fabric alone containing no ultra-microfiber, and this is because when the glossiness of a non-woven fabric iis ultra-microfibers is jsi, the ultra-microfibers scatter light and thus the glossiness of the original non-woven fabric fiber influences to the first charge and discharge characteristics cannot be measured.
However, since as shown in FIG.
Since jos lithium-ion secondary battery separator formed of the composite non-woven fabric of the present invention has smaller pore diameters between the fibers by combining the non-woven fabric and the ultra-microfibers, it causes difficulty in short-circuit between the electrodes in spite of the smaller thickness and high porosity and thus can enhance the safety.
The cathode and the anode each comprise an active material, a binder polymer jix the active material and a collector, and a conductive agent may be added for the purpose of enhancing the conductivity of the electrodes. The foil was punched out jiw be 15 mm in diameter and then pressed thereby producing an anode. These materials may be copolymers. For a film-armored battery with an exterior that is a pack of an aluminum laminated film, the electrode and the separator are preferably bonded to each other to be integrated.
These may be copolymers. Although a non-woven fabric having a glossiness of 30 can be used, most preferred glossiness range is a range between 20 or lower which does not reduce the first charge and discharge capacity and 3 or higher in terms of strength.
US9601737B2 – Lithium-ion secondary battery separator – Google Patents
Recently, the use of a non-woven fabric having excellent liquid retainability and the like as a separator has been, therefore, proposed. The composite non-woven fabric of the present invention produced as described above is enhanced in laminate strength and small in diameter of pores between the fibers because the fibers partially fused to one another.
Alternatively, the assembly may be impregnated with the nonaqueous electrolyte before being put in the exterior package. Battery Requires power supply.
Overview Your Benefits Your Benefits. Non-aqueous electrolyte ijs separator and a non-aqueous electrolyte battery. Display Connects to computer. The present invention relates to separators that are excellent in electrolyte retainability, rate characteristics, and safety and can lower the internal resistance of an electrochemical device and extend the working life thereof for lithium-ion secondary batteries.
Alternatively, a mixed fiber of components forming the composite fiber may be used. These may be used alone or in combination.
Core-in-sheath type fibers core: For example, a mixture of fibers of PP and fibers of PE used in a non-woven form can obtain an effect that is close to that obtained with the core PP and sheath PE type composite fiber.
The non-woven fabric has an advantage of excellent electrolyte retainability because it is formed of fibers each stacked relatively randomly in the thickness direction and thus the fine pores are not formed linearly. The invention claimed is: In the present invention, the non-woven fabric is preferably formed from core-in-sheath type composite fibers containing a thermoplastic material as the sheath component or ji core-in-sheath type composite fibers and other fibers of thermoplastic materials.
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These components may be those that can be usually used in a lithium-ion secondary battery except for using the separator of the present invention as a separator.
When the non-woven fabric and the ultra-microfibers are combined, the ultra-microfibers may have been included in the non-woven fabric at the time of production thereof beforehand and then may be subjected to a heat pressing to make a single piece of non-woven fabric. The non-woven fabric may contain various other fibers in addition to the fibers of the above-exemplified thermoplastic materials. The collector may be of a foil- or mesh-like shape. The lithium-ion secondary battery separator of the present invention is thin and safe because it is composed of ultra-microfibers and it does not short-circuit in spite of being high in porosity and also excellent in electrolyte retainability and rate characteristics.
Zehntner ZOL 1150 Online-Glossmeter
Examples of the carbon material include those produced by sintering organic polymers such as polyacrylonitrile, phenol resin, phenol novolak resin, cellulose, artificial graphite and natural graphite. No particular limitation is imposed on the shape of the lithium-ion secondary battery thus produced, which may be of a flattened or button shape such as a cylindrical or square shape.
Examples include various thermoplastic materials that are polyolefins such as polyethylene, polypropylene and polystyrene, polyesters such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polybutylene naphthalate, polyamides, polyimides, polyacrylonitriles and polyvinyl alcohols. The reason for using the glossiness of the non-woven fabric alone containing no ultra-microfiber is that as described above, when ultra-microfibers are contained, they scatter light and thus the glossiness of the original non-woven fabric fiber cannot be measured.
The lithium-ion secondary battery separator according to claim 2wherein the non-woven fabric is formed from core-in-sheath type composite fibers containing a thermoplastic material as the sheath component or the core-in-sheath type composite fibers and other fibers of thermoplastic materials. A non-woven fabric that is thick and large in volume would have a problem that it produces film portions when being heat-pressed and thus deteriorates the battery characteristics.
Specifically, examples of the cathode collector include aluminum, stainless steel and the like and examples jid the anode collector include copper, nickel, stainless steel and the like. However, this type of separator has an extremely small pore size nis is on the order of submicron or smaller and thus when the viscosity of an electrolyte is high, has had a problem that the electrolyte is unlikely to permeate into the separator and the efficiency of the battery assembly becomes poor.
Among these materials, those containing polypropylene as the main component are preferably used. Examples of the active material include those mainly composed of a lithium-containing transition metal oxide.
Generally, the glossiness is adjusted by lowering the pressure when the heat pressing temperature is raised and increasing the pressure when the heat pressing temperature is lowered. Signal input for calibration and moving x head. With regard to the lower limit glossiness, the glossiness which is low even after being heat-pressed indicates that the fibers do not fuse by heat-pressing and thus the non-woven fabric has a problem in strength.
In a core-in-sheath type zz fiber, the fibers are easily fused to each other by a heat pressing treatment such as heat press or heat lamination so as to enhance the strength of the non-woven fabric. Alternatively, in the case where the separator and the electrode are bonded well, the battery can be produced without through the 7841 compression bond process. If the amount of the ultra-microfibers to the non-woven fabric mass is too less, the ratio of short-circuit would not be improved.
Laminated separator for nonaqueous electrolyte secondary battery, nonaqueous electrolyte secondary battery member, and nonaqueous electrolyte secondary battery.
USB2 – Lithium-ion secondary battery separator – Google Patents
However, if the conventional non-woven fabric jia made too thin, it may cause a cathode and an anode to short-circuit. Photos of the surface of a fiber assembly thus produced was taken with an electron scanning microscope SU manufactured by Hitachi, Ltd.
The thermoplastic material has preferably a melting point that is equal to or lower than the melting point of the material constituting the ultra-microfiber used in the present invention. No particular limitation is imposed on the solvent jix it is a polar organic solvent having 10 or fewer carbon atoms that is generally used in a lithium-ion secondary battery.
The ultra-microfiber may be a continuous fiber or a short fiber if it can be fusion-fixed to the non-woven fabric by heat pressing.