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Lithium-ion battery liquid injection method

A lithium-ion battery and liquid injection technology, which is applied in the manufacture of battery components, non-aqueous electrolyte storage batteries, and electrolyte storage batteries, can solve problems affecting battery charge and discharge performance and cycle performance, and achieve improved charging times and service life, The effect of improving safety

Active Publication Date: 2016-02-24
鲍添增
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion batteries form a dense SEI film during the formation stage. If the formed SEI film is not dense and complete, it may affect the charge-discharge performance and cycle performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, the first liquid injection: inject the electrolyte solution A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 30% of the total injection weight. The mass content of VC in electrolyte A is 8%, the mass ratio of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) is a mixed solvent of 1:1, the lithium salt is LiBF4, and the concentration of lithium salt is 1mol / L.

[0037] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0038] Step 3, the second liquid injection: inject the electrolyte B containing vinylene carbonate (VC), and leave it at room temperature for 12 hours. 4%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl c...

Embodiment 2

[0045] Step 1, the first liquid injection: inject the electrolyte solution A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 35% of the total injection weight. The mass content of VC in electrolyte A is 8%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) with a mass ratio of 1:1, the lithium salt is LiBF4, and the lithium salt concentration is 1mol / L.

[0046] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0047] Step 3, the second liquid injection: inject the electrolyte solution B containing vinylene carbonate (VC), and leave it at room temperature for 12 hours, wherein the injected liquid volume is 25% of the total injec...

Embodiment 3

[0054] Step 1, the first liquid injection: inject the electrolyte solution A containing vinylene carbonate (VC) into the lithium-ion secondary battery to be injected. After liquid injection, the battery was left at room temperature for 10 hours to fully infiltrate the pole piece and separator. The injection volume is 40% of the total injection weight. The mass content of VC in electrolyte A is 8%, the solvent is a mixed solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) with a mass ratio of 1:1, the lithium salt is LiPF6, and the lithium salt concentration is 1mol / L.

[0055] Step 2, formation: age the battery obtained in step 1, seal it with glue and then form it, charge it at a constant current of 0.02C to 3.2V, and hold it for 10 hours.

[0056] Step 3, the second liquid injection: inject the electrolyte solution B containing vinylene carbonate (VC), leave it at room temperature for 12 hours, and the injected liquid volume is 30% of the total injected liqu...

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Abstract

The invention relates to a manufacturing technology of a lithium ion battery, in particular to a liquid injection method for a lithium ion battery. The method comprises the following steps: step 1, injecting liquid for the first time, injecting electrolyte solution A containing vinylene carbonate into the lithium-ion secondary battery to be injected; the liquid injection volume is 30-45% of the total liquid injection quality ; Step 2, into; Step 3, the second injection, the electrolyte solution B containing vinylene carbonate is injected, and the injection volume is 25% to 35% of the total injection quality; Step 4, into; Step 5, For the third injection, the electrolyte C containing vinylene carbonate is injected, and the injection volume is 15% to 25% of the total injection quality; step six, chemical formation; step seven, the fourth injection, the electrolyte D injection, the liquid injection volume is 10% to 20% of the total injection liquid mass; Step 8, aging, and secondary packaging after aging to obtain a lithium-ion battery. The invention promotes the battery to form a stable and dense SEI film, and can effectively improve the charging times and service life of the battery.

Description

technical field [0001] The invention relates to a manufacturing technology of a lithium ion battery, in particular to a liquid injection method for a lithium ion battery. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, small self-discharge, and long cycle life, and have been widely used in the field of consumer electronics. [0003] Electrolyte is an important part of lithium-ion batteries. It is the carrier and medium for the transmission of lithium ions between the positive and negative electrodes, and also provides lithium ions. The conductivity of the electrolyte is one of the important parameters of the electrolyte, which has an important impact on the performance of the specific capacity and rate of the electrode active material. [0004] The currently commonly used lithium-ion battery electrolyte uses LiPF6 as the solute,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/36H01M50/609
CPCH01M10/058H01M50/60Y02E60/10
Inventor 鲍添增秦怀鹏
Owner 鲍添增
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