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Formation method of lithium ion secondary battery

A secondary battery and formation method technology, applied in secondary batteries, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the initial capacity, cycle performance and low-temperature rate discharge performance of lithium-ion secondary batteries To improve the ionic conductivity and low-temperature applicability and ensure the electrochemical performance

Inactive Publication Date: 2010-02-03
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to overcome the disadvantages of poor initial capacity, cycle performance and low-temperature rate discharge performance of the lithium-ion secondary battery obtained by the existing chemical conversion method, and to provide a lithium-ion secondary battery with a higher initial capacity. Formation method of lithium-ion secondary battery with capacity, good cycle performance and good low-temperature rate discharge performance

Method used

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  • Formation method of lithium ion secondary battery

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Effect test

Embodiment 1

[0026] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention

[0027] 1. Preparation of positive electrode

[0028] 60 grams of polyvinylidene fluoride (PVDF) was dissolved in 770 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, and then 2000 grams of positive electrode active material lithium cobaltate (LiCoO 2 ) and 40 grams of acetylene black powder are added to the above solution, then 200 grams of N-methylpyrrolidone (NMP) is added, fully stirred and mixed to obtain a positive electrode slurry; the positive electrode slurry is evenly coated on the Both sides of the aluminum foil were heated and dried under vacuum at 125°C for 2 hours, rolled, and cut into pieces to obtain a positive electrode of 750 mm (length) × 55.5 mm (width) × 183 microns (thickness). Each positive electrode contained 10 grams of positive active material LiCoO 2 .

[0029] 2. Preparation of negative elect...

Embodiment 2

[0039] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention

[0040] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the step of preparing the electrolyte, the first electrolyte did not contain the additive VC. Lithium-ion secondary battery A2 was obtained after the formation.

Embodiment 3

[0042] This embodiment is used to illustrate the preparation of the lithium ion secondary battery provided by the present invention

[0043] Lithium-ion secondary battery is prepared according to the method of Example 1, the difference is that in the preparation step of electrolyte, ethylene carbonate (EC), diethyl sulfite (DES) and dimethyl carbonate (DMC) are prepared according to The mass ratio is 1:3:1 and the LiPF 6 Dissolved in the above mixed solvent to obtain the first electrolyte, in which LiPF 6 The content is 15.1% by weight of the total amount of the electrolyte, and 0.5% by weight of the additive vinylene carbonate (VC) is added to the total amount of the first electrolyte.

[0044] Mix γ-butyrolactone (GBL) and ethyl methyl carbonate (EMC) according to the mass ratio of 1:2, and LiPF 6 Dissolved in the above-mentioned mixed solvent to obtain the second electrolyte, LiPF in the electrolyte 6 The content of is 10.2% by weight of the total electrolyte solution. ...

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Abstract

The invention relates to a formation method of a lithium ion secondary battery. The method comprises the following steps: performing a first formation on a battery containing a first electrolytic solution; and then injecting a second electrolytic solution into a battery container after the first formation to perform a second formation, wherein the first electrolytic solution contains an electrolyte and a first solvent which is mixture of a solvent A and a solvent B; the solvent A is ethylene carbonate, and the solvent B is one or more selected from dimethyl carbonate, diethyl carbonate, methylethyl carbonate, dimethyl sulfite and diethyl sulfite; and the second electrolytic solution contains electrolyte and a second solvent, and the second solvent is one or more selected from propylene carbonate, butylene carbonate, dimethoxyethane, gamma-butyrolactone, methyl formate, ethyl formate, methyl acetate, ethyl acetate, ethyl propionate, ethyl butyrate and propyl butyrate. The lithium ion secondary battery obtained by the method has excellent cycle performance and low-temperature multiplying factor discharge performance.

Description

technical field [0001] The invention relates to a method for forming a lithium ion secondary battery. Background technique [0002] With the improvement of people's living standards, people's requirements for quality of life are also getting higher and higher. With the rapid development of electronic products, people rely more and more on portable power sources. Lithium-ion secondary batteries have achieved rapid development as a leader in mobile power sources. However, due to the limitations of the organic electrolyte used in lithium-ion secondary batteries, the conductivity of the electrolyte is poor, and it is more sensitive to ambient temperature, which leads to the rate discharge performance and low-temperature applicability of lithium-ion secondary batteries. Poor, can not fully meet people's needs. [0003] Studies have found that some solvents, such as propylene carbonate (PC), butylene carbonate (BC), dimethoxyethane (DME), methyl formate (MF) and ethyl formate (...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/44
Inventor 姜俊刚李科张建飞
Owner SHANGHAI BYD
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