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Preparation technology for long-service life lithium ion battery

The invention relates to a lithium-ion battery and a preparation process technology, which is applied in the field of preparation technology of long-life lithium-ion batteries, and can solve the problems of short battery usage time and shortened service life, so as to improve the battery cycle life, increase the absorption, and improve the cycle. effect of life

Inactive Publication Date: 2019-02-05
东莞市三臻科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the increase in power consumption of the device, the battery life is getting shorter and shorter. A battery needs to be charged 1-2 times a day, which leads to a shorter service life of this type of lithium-ion battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation process for a long-life lithium-ion battery, comprising the steps of:

[0031] S1. Positive plate: Mix the components according to the following content to make a slurry: lithium cobaltate 95.0wt%, CNTs1.2wt%, carbon black CB1.5wt%, PVDF2wt%, NMP0.30wt%, the slurry made The material is coated on an aluminum foil with a thickness of 12-15 μm, and then rolled to form a positive electrode sheet with a thickness of 0.115-0.125 mm; lithium cobalt oxide is a large single crystal particle with a particle size of D50=15.0-20.0 μm; tap density: 2.8-3.0g / cc;

[0032] S2. Negative plate: Mix the components according to the following contents to make a slurry: graphite 96.0wt%, carbon black CB1.0wt%, CMC1.0wt%, SBR2.0wt%, and the prepared slurry is coated on the thickness 6-9μm copper foil, and then rolled to form a negative plate with a thickness of 0.128-0.135mm; graphite particle size D50=17.0-22.0μm, tap density: 1.0-1.15g / cc, the graphite is secondary Granules...

Embodiment 2

[0036] The preparation process of this example is generally similar to that of Example 1, except that the composition of the slurry is different. In the specific step S1, lithium cobaltate is 96.0wt%, CNTs0.7wt%, carbon black CB1.0wt%, PVDF1.95wt% %, NMP0.35wt%; step S2 described graphite 93.0wt%, carbon black CB2.0wt%, CMC2.5wt%, SBR2.5wt%.

[0037] The lithium-ion battery is charged and discharged at 0.5C for 800 cycles and the capacity retention rate is ≥81.0%.

Embodiment 3

[0039] The preparation process of this example is generally similar to that of Example 1, except that the composition of the slurry is different. In the specific step S1, lithium cobaltate is 95.25wt%, CNTs1wt%, carbon black CB2.0wt%, PVDF1.5wt%, NMP0.25wt%; graphite 93.5wt%, carbon black CB1.5wt%, CMC2wt%, SBR3.0wt% described in step S2.

[0040] The lithium-ion battery is charged and discharged at 0.5C for 800 cycles and the capacity retention rate is ≥82.0%.

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Abstract

The invention discloses a preparation technology for a long-service life lithium ion battery. The preparation technology comprises the following steps of S1, positive plate: coating an aluminum foil with a prepared slurry, and performing rolling to form the positive plate; S2, negative plate: coating a copper foil with the prepared slurry, and performing rolling to form the negative plate; and S3,after winding of the positive plate and the negative plate, performing flat pressing, baking, battery formation and storage to prepare the lithium ion battery. In the preparation technology providedby the invention, two conductive agents including CB (Carbon Black) and CNTs (Carbon Nanotubes) are added in a positive electrode, the contents are optimized according to conductivity testing data ofthe electrodes, and the two conductive agents have the optimal effect to improvement of the conductivity of the electrodes through the crosslinking effect; by performing high-temperature flat pressingand baking on a roll core, the contact tightness and uniformity between the electrodes are improved, the uniform quality of an SEI membrane on the surface of the negative electrode is improved, and thus the cycle life of the battery is prolonged; and pressurization is performed in battery formation, and small-current charging is performed for a long time with a current being 0.03-0.05 C, so thatthe uniformity of SEI formation on the surface of the negative electrode can be improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the field of polymer lithium ion batteries, and more specifically relates to a preparation process of a long-life lithium ion battery. Background technique [0002] Lithium-ion battery is a rechargeable battery, mainly composed of positive electrode, negative electrode and electrolyte solution. It mainly relies on lithium ions to move between the positive and negative electrodes to work. During charging and discharging, Li + Intercalation and deintercalation back and forth between two electrodes: when charging the battery, Li + It is deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] A battery that generally uses a material containing lithium as an electrode is a representative of a modern high-performance battery. Lithium-ion battery is a high-performance battery t...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/1393H01M10/0587
CPCH01M4/1393H01M4/625H01M10/0587Y02E60/10Y02P70/50
Inventor 何彬汤小龙
Owner 东莞市三臻科技发展有限公司
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