Secondary battery, and battery module, battery pack, and device including same

A technology of secondary batteries and button batteries, which is applied in the direction of secondary batteries, battery electrodes, batteries, etc., to achieve the effect of long cycle life and good storage performance

Pending Publication Date: 2021-03-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the age of the car, the life of the battery poses a serious challenge

Method used

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  • Secondary battery, and battery module, battery pack, and device including same
  • Secondary battery, and battery module, battery pack, and device including same
  • Secondary battery, and battery module, battery pack, and device including same

Examples

Experimental program
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Effect test

preparation example Construction

[0042] The second button battery can be prepared by referring to the method for preparing the first button battery. Wherein, fluoroethylene carbonate (FEC) may or may not be added to the electrolyte solution of the second button battery.

[0043] After extensive research by the present inventors, it has been found that when the positive and negative electrodes include a specific type of active material, the performance parameter K of the secondary battery is controlled at 1.05 to 1.25 at the same time, which can more effectively make the positive electrode sheet and the negative electrode sheet Matching, so that the secondary battery has high capacity performance and capacity retention rate during storage and circulation, and can also improve the lithium ion and electron conductivity of the negative electrode sheet. Therefore, secondary batteries can take into account high energy density, cycle performance, storage performance and kinetic performance at the same time.

[0044...

Embodiment 1

[0124] 1) Preparation of positive electrode sheet

[0125] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2 (NCM811), conductive agent Super P, and binder PVDF are fully stirred and mixed in an appropriate amount of NMP at a weight ratio of 94:3:3 to form a uniform positive electrode slurry; apply the positive electrode slurry to the positive electrode current collector On the two surfaces of the aluminum foil, after drying, cold pressing, slitting, and cutting into pieces, the positive electrode sheet is obtained.

[0126] 2) Preparation of negative electrode sheet

[0127] First mix the negative electrode active material SiO and artificial graphite in a weight ratio of 20:80, then mix the mixed negative electrode active material with the conductive agent Super P and the binder polyacrylate in a weight ratio of 93:2:5 in an appropriate amount of deionized Fully stir and mix in water to form a uniform negative electrode slurry; apply the negative electrode slurry on...

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Abstract

The invention discloses a secondary battery, and a battery module, a battery pack and a device containing the secondary battery. The secondary battery comprises a positive pole piece, a negative polepiece, an isolating membrane and an electrolyte, the positive pole piece comprises a positive current collector and a positive diaphragm which is arranged on at least one surface of the positive current collector and comprises a positive active material; wherein the negative pole piece comprises a negative current collector and a negative diaphragm which is arranged on at least one surface of thenegative current collector and comprises a negative active material, and the positive active material comprises one or more of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminumoxide. The negative electrode active material comprises a silicon-based material and a carbon material; the secondary battery satisfies 1.05<=K<=1.25. The secondary battery provided by the invention can simultaneously consider relatively good cycle performance, storage performance and relatively high energy density.

Description

technical field [0001] The present application belongs to the technical field of energy storage devices, and in particular relates to a secondary battery, a battery module, a battery pack, and a device containing the secondary battery. Background technique [0002] In recent years, the production and sales of new energy vehicles have grown rapidly, and major global auto groups have focused on new energy vehicles. It is foreseeable that the market for new energy vehicles will further expand in the future. At present, lithium-ion secondary batteries are the most widely used in pure electric vehicles, plug-in hybrid vehicles and other models. Given the age of the car, battery life poses a serious challenge. Therefore, how to further improve the cycle performance of the battery has become an important technical issue in the research and development of the secondary battery. Contents of the invention [0003] In view of the problems existing in the background technology, the...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/36H01M4/38H01M4/485H01M4/505H01M4/525H01M4/583
CPCH01M10/0525H01M4/525H01M4/386H01M4/583H01M4/366H01M4/483H01M4/58H01M4/505H01M2220/20H01M4/587H01M4/622H01M4/625H01M50/109H01M2004/021H01M2004/027H01M2004/028H01M2010/4292Y02E60/10H01M10/052H01M4/364H01M4/131H01M4/133H01M4/134
Inventor 李茂华闫传苗孙信
Owner CONTEMPORARY AMPEREX TECH CO
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