A laminated composite battery

A composite battery technology, which is applied in the direction of secondary batteries, battery components, hybrid capacitor electrodes, etc., can solve the problems of limited application and low energy density, and achieve high power density, high energy density, and short charge and discharge time Effect

Active Publication Date: 2022-03-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, its energy density is not high, only a fraction or even less than a tenth of the energy density of lithium-ion batteries, which seriously limits its application in many fields that have high requirements for energy density.

Method used

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  • A laminated composite battery
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preparation example Construction

[0197]

[0198] Exemplarily, the present invention also provides a method for preparing the above-mentioned composite battery, the method comprising the following steps:

[0199] (1) preparing a positive electrode sheet for a lithium ion battery and a positive electrode sheet for a supercapacitor; and / or, preparing a positive electrode sheet for a lithium ion battery and a supercapacitor;

[0200] (2) prepare negative plate;

[0201] (3) Lead out two independent positive pole tabs in the positive pole piece for lithium-ion batteries and the positive pole piece for supercapacitors, or lead out two independent positive pole lugs in the positive pole pieces for lithium-ion batteries and supercapacitors; A negative pole lug is drawn from the negative electrode sheet to form a three-pole lug structure with two mutually independent positive pole lugs and a common negative pole lug;

[0202] (4) The composite battery is formed by stacking alternately in the pattern of negative ele...

preparation example 1

[0219] Preparation Example 1 Positive electrode sheet for supercapacitor

[0220] Porous carbon activated carbon powder (specific surface area ≥ 1000m 2 / g), binder PVDF, conductive carbon black, and carbon nanotubes are mixed and dispersed in NMP (N-methylpyrrolidone), and after mixing, they are vacuum stirred to obtain a uniform dispersion to prepare a positive electrode slurry for supercapacitors. The solid component includes 93wt% positive active material, 4wt% binder PVDF, 2wt% conductive carbon black and 1wt% carbon nanotube. The total solid content in the positive electrode slurry for supercapacitor is 40wt%.

[0221] Apply the supercapacitor positive electrode slurry evenly on both sides of the aluminum foil, vacuum dry at 100-120°C for 10-24 hours, and roll until the compaction is 1.0-2.1g / cm 3 , to obtain a number of supercapacitors with positive plate C1 denoted as C-double (such as figure 1 (c) in).

[0222] Apply the positive electrode slurry for supercapacito...

preparation example 2

[0223] Preparation Example 2 Positive electrode sheet for lithium ion battery

[0224] The positive electrode active material (LiNi 0.8 co 0.1 mn 0.1 o 2 ), binder PVDF, conductive carbon black, and carbon nanotubes are mixed and dispersed in NMP, and after mixing, they are stirred in a vacuum to obtain a uniform dispersion to make a cathode slurry for lithium-ion batteries. The solid component includes 94wt% positive active material, 3wt% binder PVDF, 2wt% conductive carbon black and 1wt% carbon nanotube. The total solid content in the positive electrode slurry for lithium ion batteries is 70 wt%.

[0225]Apply the positive electrode slurry for lithium-ion batteries evenly on both sides of the aluminum foil, vacuum dry at 100-120°C for 10-24 hours, and roll until the compaction is 2-4.8g / cm 3 , to obtain the positive electrode sheet L1 for lithium-ion batteries is denoted as L-double (such as figure 2 (c) in).

[0226] Apply the positive electrode slurry for lithium-i...

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Abstract

An embodiment of the present invention proposes a stacked composite battery, including a lithium-ion battery stack unit and a supercapacitor stack unit. The lithium-ion battery stack unit includes a positive electrode sheet, a negative electrode sheet, and a separator that can be used in a lithium-ion battery. The stacked supercapacitor unit includes a positive electrode sheet, a negative electrode sheet and a diaphragm that can be used for a supercapacitor; the two outermost layers of the composite battery are selected from a positive electrode sheet coated with a positive electrode material on one side and a positive electrode sheet coated on one side with One of the negative plates of the negative electrode material; in each of the supercapacitor laminated units, the active material of the positive electrode material of the supercapacitor is the same as the active material of the negative electrode material of the supercapacitor. The composite battery combines the advantages of lithium-ion batteries and supercapacitors, and has high power density.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a laminated composite battery. Background technique [0002] In recent years, with the rise and development of electric vehicles, electric bicycles, high-power start-stop equipment and other fields, there is an increasing demand for power supplies with both high energy density and high power density. Lithium-ion batteries have the advantages of large specific energy, high working voltage, environmental friendliness, and no memory effect, but their power density is often only a fraction or even less than one-tenth of that of supercapacitor batteries, and their capacity can be exerted at lower temperatures. low rate problem. [0003] In contrast, supercapacitor batteries have a short charge and discharge time, and can reach more than 95% of their rated capacity after charging for 1 second to 10 minutes; they have good ultra-low temperature characteristics and a wide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01G11/28H01M50/536H01M50/538H01M10/0585H01M16/00
CPCH01M10/0525H01M10/0585H01G11/28H01M16/00Y02E60/10Y02E60/13Y02P70/50
Inventor 伍鹏李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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