Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for forming cylindrical lithium-ion secondary battery

A secondary battery and formation method technology, which is applied in the direction of non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, sustainable manufacturing/processing, etc., can solve the problem of cylindrical lithium-ion secondary battery formation inflation and other problems, and achieve improved cycle life Effects on performance, extended life, and reduced flatulence

Active Publication Date: 2013-09-11
DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of the gas swelling problem caused by the existing formation method of the cylindrical lithium-ion secondary battery, and provide a lithium-ion secondary battery formation method that effectively alleviates the gas swelling problem of the battery in the formation process

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
  • Method for forming cylindrical lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example illustrates that the present invention provides a kind of formation method of the secondary battery of cylindrical lithium ion

[0018] 1. Preparation of battery

[0019] (1) Preparation of positive electrode

[0020] Mix 143 grams of positive electrode active ingredient LiFePO4, 6.4 grams of conductive agent SP, 9.55 grams of binder polyvinylidene fluoride PVDF, and 262 grams of N-methylpyrrolidone, and then stir in a vacuum mixer to form a uniform positive electrode slurry.

[0021] The slurry was uniformly coated on 18um aluminum foil, then dried at 120°C, rolled, and cut into strips to obtain a positive electrode with a size of 1540×55×0.167mm, which contained 26.4 grams of active ingredient LiFePO4.

[0022] (2) Preparation of negative electrode

[0023] Mix 53.2 grams of active ingredient natural graphite, 1.48 grams of acetylene black, 1.77 grams of conductive agent SP, 2.65 grams of binder polyvinylidene fluoride PVDF, 64.5 grams of N-methylpyrrol...

Embodiment 2

[0038] Prepare a cylindrical lithium-ion secondary battery according to the method described in Example 1, the difference is the formation method, under the condition of 25 ° C, charge with a constant current of 0.05 C until the charging time is 180 minutes to stop charging, Then charge with a constant current of 0.3C, stop charging until the charging time is 120 minutes, and finally charge with a constant current and constant voltage. Charging, the cut-off current is 0.03C to stop charging, the whole formation is completed, and the battery A2 is obtained after aging at a high temperature of 45°C for 3 days.

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

No PUM Login to View More

Abstract

The invention relates to a method for forming a cylindrical lithium-ion secondary battery. The method comprises a step of charging the battery at a formation temperature including the steps of charging the battery with constant current and charging the battery with constant current and constant voltage, wherein the step of charging with the constant current at least comprises the step of chargingwith the constant current at two stages; and the step of charging with the constant current and constant voltage is performed after the step of charging with the constant current is finished. The method reduces gassing amount and effectively solves the inflation problem of the battery in the formation process; in addition, the formation method is also favorable for forming a uniform and stable SEI film on the surface of an electrode so as to improve the rate of maintaining battery capacity, improves the cycle life performance of the battery and prolongs the service life of the lithium-ion battery.

Description

technical field [0001] The invention relates to a method for forming a battery, in particular, the invention relates to a method for forming a cylindrical lithium ion secondary battery. Background technique [0002] The battery must be formed before use in order to activate the positive and negative active materials of the battery, so that the battery can reach the best state of use. The formation of lithium-ion secondary rechargeable batteries is an important stage in the production of batteries. The formation is related to the capacity of the battery. , cycle life performance, safety performance and many other aspects of quality. [0003] The formation of the battery is the process of charging the battery for the first time. There are generally two forms of formation of existing lithium-ion secondary batteries, open formation and closed formation. The open-type formation is the case where the battery is formed and then sealed after filling the liquid, but the open-type f...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 庄志光
Owner DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN