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Formation technology for flexible packing lithium ion secondary battery

A secondary battery and flexible packaging technology, applied in the field of lithium-ion batteries, can solve problems affecting battery performance, electro-hydraulic decomposition, etc., and achieve the effects of improving chemical conversion efficiency and effect, accelerating decomposition, and reducing partial pressure

Inactive Publication Date: 2009-12-30
JIANGSU FRONT NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For backup lithium-ion batteries, the floating charge voltage of a single battery is usually 4.2V. Although the decomposition voltage of the electrolyte is generally marked as 4.25V or 4.5V, the electro-hydraulic will still partially Decomposition, affecting battery performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Production of battery

[0030] (1) Production of positive electrode sheet

[0031] 100 grams of lithium manganate, 3 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of nitrogen methyl pyrrolidone to prepare a slurry.

[0032] The positive electrode slurry was evenly coated on the aluminum foil, and vacuum-dried at 120°C for 18 hours; rolled to 120 μm; the pole piece was cut into a 500×40mm pole piece, which contained 8.70g of lithium manganate.

[0033] (2) Production of negative electrode sheet

[0034] 100 grams of graphite, 1.5 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of methylpyrrolidone to prepare negative electrode slurry.

[0035] The negative electrode slurry was uniformly coated on the copper foil, and vacuum-dried at 120°C for 18 hours; rolled to 90 μm; the pole piece was cut into a pole piece of 505×40.5mm, which contained 2.86g of graphite.

[0...

Embodiment 2

[0056] 1. Fabrication of the battery

[0057] (1) Production of positive electrode sheet

[0058] 100 grams of lithium manganate, 3 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of nitrogen methyl pyrrolidone to prepare a slurry.

[0059] The positive electrode slurry was evenly coated on the aluminum foil, and vacuum-dried at 120°C for 18 hours; rolled to 120 μm; the pole piece was cut into a 500×40mm pole piece, which contained 8.70g of lithium manganate.

[0060] (2) Production of negative electrode sheet

[0061] 100 grams of graphite, 1.5 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of methylpyrrolidone to prepare negative electrode slurry.

[0062] The negative electrode slurry was uniformly coated on the copper foil, and vacuum-dried at 120°C for 18 hours; rolled to 90 μm; the pole piece was cut into a pole piece of 505×40.5mm, which contained 2.86g of graphite. ...

Embodiment 3

[0083] 1. Fabrication of the battery

[0084] (1) Production of positive electrode sheet

[0085] 100 grams of lithium manganate, 3 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of nitrogen methyl pyrrolidone to prepare a slurry.

[0086] The positive electrode slurry was evenly coated on the aluminum foil, and vacuum-dried at 120°C for 18 hours; rolled to 120 μm; the pole piece was cut into a 500×40mm pole piece, which contained 8.70g of lithium manganate.

[0087] (2) Production of negative electrode sheet

[0088] 100 grams of graphite, 1.5 grams of super conductive carbon black, and 2.5 grams of PVDF were uniformly dispersed in 45 grams of methylpyrrolidone to prepare negative electrode slurry.

[0089] The negative electrode slurry was uniformly coated on the copper foil, and vacuum-dried at 120°C for 18 hours; rolled to 90 μm; the pole piece was cut into a pole piece of 505×40.5mm, which contained 2.86g of graphite. ...

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Abstract

The invention provides formation technology for a flexible packing lithium ion secondary battery, which is characterized in that the assembled battery is charged by using multi-step constant current and constant voltage and discharged by using the constant current; and the flexible packing lithium ion battery is circularly charged and discharged by using the constant current, wherein the upper limit voltage of the charging of the multi-step constant current, the upper limit voltage of the charging of the constant voltage and the upper limit voltage of the charge-discharge cycle of the constant current are between 4.25 and 4.5V. The formation technology is suitable for the flexible packing lithium ion battery of which the lithium manganate and the lithium ferrous phosphate are anode materials and the implementation is simple; in addition, the formation technology can obviously improve the cycle performance and the floating charge performance of the battery, and has high popularization value.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a formation process of a soft-packaged lithium-ion secondary battery. Background technique [0002] The current lithium-ion secondary batteries are mostly used in some miniaturized mobile electrical equipment such as mobile phones, notebook computers, and Bluetooth headsets. With the continuous maturity of lithium-ion battery technology and the continuous reduction of costs, people gradually realize that lithium-ion batteries should have a wider range of applications. [0003] As the world's energy problems become increasingly urgent, using lithium-ion batteries for backup power is one of the important application directions of lithium-ion batteries in the future. Most of the current lithium-ion batteries have a fully sealed structure. This structure determines that no obvious gas evolution will occur during the use of the battery. Otherwise, once the sealed stru...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/44
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 王青魏廷权钱群程袁春刚吴丽军
Owner JIANGSU FRONT NEW ENERGY
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