Lithium ion battery and production method thereof

A lithium-ion battery and battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of high-temperature cycle performance and poor cycle performance at large rates, and achieve improved contact adhesion and increased rate. performance, the effect of improving overall performance

Inactive Publication Date: 2013-05-22
SHENZHEN B&K TECH
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  • Claims
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Problems solved by technology

[0008] In view of the above situation, the present invention proposes a lithium-ion battery that improves the bonding strength between the active material and the current collector in order to overcome the defects of the prior art lithium-ion battery's poor high-temperature cycle performance and high-rate cycle performance, and improves the activity. The contact effect between the material and the current collector, thereby improving the cycle life of the lithium-ion battery under high temperature and high rate charge and discharge conditions

Method used

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  • Lithium ion battery and production method thereof

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preparation example Construction

[0030] Preparation of the positive electrode sheet: 80-115 parts of the positive active ingredient, 2-4 parts of the binder, and 2-5 parts of the positive electrode conductive agent are added to 48-130 parts of the solvent in a mass fraction ratio, and stirred to form Uniform positive electrode active material slurry; when the viscosity of the slurry is in the range of 5000-15000mPa.S, the positive electrode active material slurry is evenly coated on the graphite foil current collector, and the positive electrode active material slurry coated The positive electrode current collector of the raw material is dried, rolled and cut to form the positive electrode sheet; the active component of the positive electrode is lithium cobaltate LiCoO 2 , lithium iron phosphate LiFePO 4 , nickel cobalt lithium manganese oxide LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 and lithium manganese oxide LiMn 2 o 4 One or more mixtures; the binder is polyvinylidene fluoride (PVDF), and the positive electrode c...

Embodiment 1

[0038] A lithium-ion battery, which includes a casing, an electrolyte, a separator, a positive electrode sheet and a negative electrode sheet, wherein a separator is sandwiched between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet and the separator are all stacked on the In the casing, electrolyte is filled between the positive electrode sheet, the negative electrode sheet and the separator, wherein the positive electrode sheet is composed of a graphite foil current collector coated with a positive electrode active material slurry; the negative electrode sheet is a metal foil collector coated with a negative electrode active material. Material paste composition.

[0039] The positive electrode active material slurry is adhered to the graphite foil current collector through the binder, and the negative electrode active material slurry is adhered to the copper foil current collector through the binder...

Embodiment 2

[0046] A method of making a lithium-ion battery, which includes the preparation of a positive electrode sheet, the preparation of a negative electrode sheet and the assembly of the battery,

[0047] Preparation of the positive electrode sheet: 93 parts of positive electrode active ingredient LiFePO 4 , 4 parts of binder polyvinylidene fluoride (PVDF), 3 parts of carbon nanotubes, added to 120 parts of N-methylpyrrolidone, and then stirred in a vacuum mixer to form a uniform positive electrode active material slurry, the viscosity of the slurry The test is 12000mPa.S, and then the slurry is uniformly coated on a graphite foil current collector with a width of 300 mm and a thickness of 55 microns by a coating machine, wherein the coating speed of the coating machine is set to 1.5 m / min. The temperature and drying range of the cloth is 100-125 degrees, and then rolled and cut to obtain a positive electrode sheet with a width of 64 mm and a length of 255 mm;

[0048] Preparation ...

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Abstract

A lithium ion battery comprises a shell, electrolyte, an isolating membrane, a positive plate and a negative plate, wherein the isolating membrane is arranged between the positive plate and the negative plate in a clamping way, electrolyte is filled among the positive plate, the negative plate and the isolating membrane, and the positive plate is formed by coating positive active material slurry on a graphite foil current collector. The graphite foil is used as a positive current collector material, so that burrs caused by adopting an aluminum foil can be avoided, and the safety performance is improved; and meanwhile, the heat conduction rate of the graphite foil is higher than that of the aluminum foil, and the heat resistance is lower than that of the aluminum foil, so that the bonding strength between the active material and the current collector can be improved, the contact bonding situation between the active material and the current collector can be improved, and the cycle life of the lithium ion battery under the high temperature and large-ratio charging-discharging situation can be prolonged.

Description

【Technical field】 [0001] The invention belongs to the field of battery energy, and in particular relates to making a positive electrode of a battery by using graphite foil, and a method for making a lithium ion battery using the positive electrode. 【Background technique】 [0002] With the concept of environmentally friendly energy and sustainable development energy strategies deeply rooted in the hearts of the people, the development of green and environmentally friendly solar energy, LED lighting and lithium-ion battery industries is on the rise. The application scale of lithium-ion batteries continues to expand. Lithium-ion batteries are characterized by their high power Charging and discharging capabilities, high safety, and long-term service life are gradually occupying a mainstream position in the market. Power lithium-ion batteries are lithium-ion batteries with high-flow current charging and discharging, large-capacity storage, and are often used to provide driving pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/66H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 易凌英肖世玲
Owner SHENZHEN B&K TECH
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