A high-rate lithium titanate battery and method for making the same

A technology of lithium titanate battery and manufacturing method, which is applied to the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., and can solve the problems of long charging time, poor rate charge and discharge performance, and low safety of lithium titanate batteries , to achieve good spatial stability and leveling performance, increase rate performance, and good wettability

Active Publication Date: 2019-03-22
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the current state of the art above, the purpose of the present invention is to provide a high-rate lithium titanate battery and its preparation method. The present invention adopts a special material system and formation and aging process to effectively solve the problem of long charging time of lithium titanate battery. Poor rate charge and discharge performance, low safety and other issues

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  • A high-rate lithium titanate battery and method for making the same
  • A high-rate lithium titanate battery and method for making the same
  • A high-rate lithium titanate battery and method for making the same

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Embodiment 1

[0049] A method for manufacturing a high-rate lithium titanate battery, comprising the following steps:

[0050] a) Making positive and negative electrodes: first, make polytetrafluoroethylene (PVDF) into a solution with a mass fraction of 7% with N-methylpyrrolidone (NMP), then add superconducting carbon black, a positive electrode conductor, and disperse at high speed 2 hours, the positive electrode active material LiNi 0.33 co 0.33 mn 0.33 o 2 Disperse in the above NMP solution, stir evenly to obtain positive electrode slurry, disperse at high speed for 2 hours, add NMP to adjust the viscosity to 6000mPa·s, and sieve the positive electrode slurry with a 100-mesh metal mesh after high-speed shear dispersion for 1 hour, Evenly coat the sieved positive electrode slurry on a carbon-coated aluminum foil with a thickness of 22um. The carbon-coated layer is SP, with a thickness of 2um. Dry at 90°C. The thickness after rolling is 70μm, and the compacted density is 2.5g / cm 3 ; ...

Embodiment 2

[0062] A method for manufacturing a high-rate lithium titanate battery, comprising the following steps:

[0063] a) Making positive and negative electrodes: first, polytetrafluoroethylene (PVDF) is formulated with N-methylpyrrolidone (NMP) into a solution with a mass fraction of 8%, and then carbon nanotubes, a positive electrode conductive agent, are added and dispersed by high-speed shearing for 2 hours, the positive electrode active material LiNi 0.5 co 0.3 mn 0.2 o 2 Disperse in the above NMP solution, stir evenly to obtain positive electrode slurry, disperse at high speed for 2 hours, add NMP to adjust the viscosity to 8000mPa·s, and sieve the positive electrode slurry with a 150-mesh metal mesh after high-speed shear dispersion for 1 hour, Evenly coat the sieved positive electrode slurry on a carbon-coated aluminum foil with a thickness of 20um. The thickness after rolling is 85μm, and the compacted density is 2.6g / cm 3 ; Control the mass percentage of each componen...

Embodiment 3

[0075] A method for manufacturing a high-rate lithium titanate battery, comprising the following steps:

[0076]a) Making positive and negative electrodes: first, polytetrafluoroethylene (PVDF) is formulated with N-methylpyrrolidone (NMP) into a solution with a mass fraction of 8%, and then carbon nanotubes, a positive electrode conductive agent, are added and dispersed by high-speed shearing for 2 hours, the positive electrode active material LiNi 0.5 co 0.3 mn 0.2 o 2 Disperse in the above NMP solution, stir evenly to obtain positive electrode slurry, disperse at high speed for 2 hours, add NMP to adjust the viscosity to 7000mPa·s, and sieve the positive electrode slurry with a 150-mesh metal mesh after high-speed shear dispersion for 1 hour, Evenly coat the sieved positive electrode slurry on a carbon-coated aluminum foil with a thickness of 20um. The carbon-coated layer is SP with a thickness of 2um. Dry at 100°C. The thickness after rolling is 85μm, and the compacted ...

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Abstract

The invention relates to the field of lithium batteries, in particular to a high-rate lithium titanate battery and a manufacturing method thereof. The lithium titanate battery includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and an outer package. The positive and negative active materials, binders, and conductive agents are coated on the carbon-coated aluminum foil current collector, and a special high-porosity High-rate diaphragm and high-rate electrolyte system are laminated, packaged and injected, and then high-rate lithium titanate batteries are prepared by high-temperature, high-pressure formation and aging processes, which effectively solves the problem of long charging time and poor rate charge-discharge performance of lithium titanate batteries. , low security issues.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a high-rate lithium titanate battery and a manufacturing method thereof. Background technique [0002] At present, the energy crisis has become the most serious problem in the 21st century, and it has become an inevitable development trend that non-renewable fossil energy will be replaced by green energy. Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental protection. They have occupied an important position in the energy storage device market and are used in a variety of portable mobile devices, such as mobile phones, cameras, and notebook computers. Gradually applied to electric bicycles (Ebike), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), pure electric vehicles (EV) and other large electric equipment. [0003] Since 2017, new energy buses are still showing a growing trend. At present, the mainstream...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M2/16H01M10/058H01M50/411
CPCH01M10/0525H01M10/0567H01M10/058H01M2300/0037H01M50/411Y02E60/10Y02P70/50
Inventor 胡金星张宝华娄勇刚郑康方坤罗伟龙
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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