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A kind of formation method of lithium ion battery

A technology of lithium-ion batteries and formation methods, which is applied in the field of formation of lithium-ion batteries, and can solve problems such as increased consumption of lithium ions, inability to effectively utilize the gram capacity of the positive electrode of the battery, and severe flatulence

Active Publication Date: 2019-09-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon-carbon composite anode materials have good cycle performance, but at the same time, due to the expansion effect of silicon, the SEI film will grow repeatedly on the surface of the anode, excessively increasing the consumption of lithium ions, resulting in a decrease in capacity and cycle life
[0005] The development of high-energy-density batteries requires the use of high-capacity lithium-rich manganese-based materials, with graphite materials or further with silicon-carbon composite negative electrode materials, but due to the above problems, the capacity of the positive electrode of the battery made by ordinary chemical conversion methods cannot be effectively utilized. Low specific energy, severe flatulence, large internal resistance, low initial efficiency, poor rate performance, poor cycle performance

Method used

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  • A kind of formation method of lithium ion battery
  • A kind of formation method of lithium ion battery
  • A kind of formation method of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0060] The lithium ion battery that present embodiment provides, its manufacture method is:

[0061] The mass ratio of the positive electrode is: lithium-rich manganese-based material: conductive carbon black: conductive graphite: polyvinylidene fluoride = 96:1.5:0.5:2; polyvinylidene fluoride is dissolved in N-methylpyrrolidone solvent to prepare 8 % glue, then add conductive graphite and conductive carbon black, add lithium-rich manganese-based materials after the dispersion is complete, until the slurry is evenly mixed and dispersed, add N-methylpyrrolidone to adjust the viscosity to 5000-8000cp, and then mix the slurry The material is evenly coated on the aluminum foil with a thickness of 15μm, and the density of both sides of the coating is 36mg / cm 2 , and rolled and cut to obtain the positive electrode sheet.

[0062] Negative electrode mass ratio is: silicon-carbon composite material (the ratio of silicon is 15%): conductive carbon black: conductive graphite: sodium ca...

Embodiment 2

[0074] The lithium ion battery that present embodiment provides, its manufacture method is:

[0075] Positive sheet production is exactly the same as embodiment 1.

[0076] The mass ratio of the negative electrode is: silicon-carbon composite material: conductive carbon black: conductive graphite: sodium carboxymethyl cellulose: styrene-butadiene rubber = 95: 1.5: 1.5: 2; the thickener sodium carboxymethyl cellulose is dissolved in deionized Prepare 2.5% glue solution in water, then add conductive carbon black, add silicon-carbon composite material (the proportion of silicon is 7%) in batches several times after dispersion is complete, add binder styrene-butadiene rubber emulsion after mixing evenly, add water to adjust When the viscosity reaches 2000-4000cp, the mixed slurry is evenly coated on a copper foil with a thickness of 8 μm. The surface density of the coating is calculated by corresponding to 4% excess capacity of the positive electrode, and the negative electrode sh...

Embodiment 3

[0088] The lithium ion battery that present embodiment provides, its manufacture method is:

[0089] Positive sheet production is exactly the same as embodiment 1.

[0090] The negative electrode mass ratio is: artificial graphite material: conductive carbon black: conductive graphite: sodium carboxymethyl cellulose: styrene-butadiene rubber = 95: 1.5: 1.5: 2; the thickener sodium carboxymethyl cellulose is dissolved in deionized water Prepare a 2.5% glue solution, then add conductive carbon black, add artificial graphite in batches several times after the dispersion is complete, add the binder styrene-butadiene rubber emulsion after mixing evenly, add water to adjust the viscosity to 2000-4000cp, and then put the mixed The slurry is uniformly coated on a copper foil with a thickness of 8 μm, and the coating area density is calculated by corresponding to an excess capacity of 8% of the positive electrode, and the negative electrode sheet is obtained by rolling and cutting.

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Abstract

The invention provides a method for the formation of lithium-ion batteries, comprising the following steps: A) the lithium-ion batteries are left standing at room temperature for 12-24 hours after liquid injection, and then left standing at 40-45°C for 8-20 hours; B) using 0.01C- Charge the battery voltage to 3.5-3.8V with a current of 0.03C, and keep the ambient temperature at 5-15°C; C) Charge the battery voltage to 3.8-4.35V with a current of 0.03-0.06C, and keep the ambient temperature at 20-30°C ; D) Charge the battery voltage to 4.55-4.65V at a current of 0.06-0.15C, then charge at a constant voltage of 4.55-4.65V to a current ≤0.02C, and keep the ambient temperature at 20-30°C; E) Aging at high temperature. The formation method of the lithium ion battery of the invention can effectively reduce the internal resistance of the battery, improve the cycle performance of the battery, and increase the energy density of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a formation method of lithium ion batteries. Background technique [0002] At present, with the widespread application of electronic products and the rapid development of the electric vehicle industry, people have put forward higher requirements for the battery life of lithium-ion batteries. More and more research institutions and battery companies have begun to vigorously develop lithium-ion batteries with higher energy density. Development of ion batteries. [0003] Cathode materials play a decisive role in the energy density of lithium-ion batteries. Lithium-rich manganese-based cathode materials have become a current research hotspot because of their high practical capacity (above 250mAh / g). The study found that the lithium-rich manganese-based material xLi 2 MnO 3 ·(1-x)LiMO 2 When charging for the first time, when the charging voltage is higher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 蒋亚北田爽刘兆平贺志龙胡华胜
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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