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1.5V chargeable lithium battery and preparation method thereof

A technology for rechargeable lithium batteries and battery cells, applied in lithium batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve problems such as uneven current density at the SEI interface, battery safety issues, etc., and achieve good thermal stability and Anti-puncture strength, save production cost, and improve the effect of lithium ion conductivity

Active Publication Date: 2013-05-22
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when metal lithium is used as a negative electrode, it is very easy to react with the electrolyte to form a solid electrolyte interface (SEI) layer. Due to the uneven current density at the SEI interface during charging, it is easy to cause the formation of lithium dendrites. Gradually grow in the medium, even penetrate the PP, PE or PP / PE composite separator of the lithium battery, directly contact with the positive electrode, cause the internal short circuit of the battery and cause the safety problem of the battery

Method used

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  • 1.5V chargeable lithium battery and preparation method thereof
  • 1.5V chargeable lithium battery and preparation method thereof
  • 1.5V chargeable lithium battery and preparation method thereof

Examples

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Embodiment 1

[0038] This example illustrates the preparation of an 18650 rechargeable lithium ion battery with a voltage of 1.5V provided by the present invention.

[0039] (1) Preparation of lithium titanate cathode

[0040] Dissolve 3 g of polyvinylidene fluoride (PVDF) in 120 mL of N-methylpyrrolidone (NMP), then add 24 g of lithium titanate powder and 3 g of carbon black to it, and then stir in vacuum for 6 hours to form a uniform positive electrode slurry. Coat or spray the slurry on one side of the aluminum foil with a thickness of 16μm and a width of 60mm (which should be cleaned and welded with tabs), dried at 120℃, and then coated on the slurry The other side of the aluminum foil is rolled to obtain a lithium titanate positive electrode with a thickness of 116 μm. The surface density of the lithium titanate active material is 15 mg / cm. 2 .

[0041] (2) Preparation of composite layer of lithium titanate cathode and lithium fast ion conductor separator

[0042] Dissolve 6g PVDF in 270mL NM...

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Abstract

The invention discloses a 1.5V chargeable lithium battery and a preparation method thereof, and belongs to the technical field of a chemical energy storage battery. The 1.5V chargeable lithium battery comprises a positive electrode, an inorganic composite diaphragm and a negative electrode, and is characterized in that the inorganic composite diaphragm consists of inorganic material power containing lithium fast ion conductor powder and a bonder, the internal short-circuit when the battery is internally repeatedly charged and discharged can be prevented, and the safety of the battery is improved; and the inorganic composite diaphragm is in-situ prepared on a positive active layer, so that the interface adhesion is good, the interface resistance is also reduced, and the preparation process of the battery is simplified.

Description

Technical field [0001] The invention relates to a low-voltage rechargeable battery, in particular to a 1.5V rechargeable lithium battery. Background technique [0002] With the rapid development of electrical, electronic, communications, and computer industries, the demand for highly stable rechargeable batteries is increasing. 1.5V low-voltage battery is a widely used battery, currently there are two series on the market: one series is silver-zinc battery, which is characterized by high specific energy, but the disadvantage is that it is expensive and has a short service life; the other series is Zinc-manganese battery, although the price of this battery is relatively cheap, but it has low capacity and high self-discharge rate. [0003] Lithium batteries have attracted much attention due to their high specific capacity, good cycle performance, and low self-discharge rate. As an electrode material, lithium titanate has a lithium intercalation potential of 1.5V (vs. Li + / Li), the...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0525H01M2/16H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 陈永翀康利斌李琪韩立张萍王秋平
Owner BEIJING HAWAGA POWER STORAGE TECH
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