Battery positive plate, flexible package lithium carbon fluoride primary battery and preparation method of flexible package lithium carbon fluoride primary battery

A battery cathode, carbon fluoride technology, applied in the direction of primary battery electrodes, battery electrodes, positive electrodes, etc., can solve the problems of uneven thickness variation of positive electrode sheets, low shell strength, battery thickness expansion, etc., to broaden the application market and Application areas, improving the capacity utilization rate, reducing the effect of battery polarization

Active Publication Date: 2020-10-13
TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inevitable inhomogeneity of the electrode of the battery during the reaction process, the thickness change of different positions of the positive electrode sheet is also inhomogeneous during the discharge process. Participate in the reaction, the battery capacity utilization rate is low
[0005] In fact, the lithium in the negative electrode is continuously consumed during the discharge process, and its thickness is continuously reduced. However, the expansion of the positive electrode sheet and the formation of ravines, wrinkles, etc. will lead to poor contact between the positive and negative electrode sheets and the separator, and the distance between them will increase. Eventually, the thickness of the battery will expand significantly, which in turn will lead to a decrease in the utilization rate of the battery capacity
[0006] For batteries with flexible packaging structure, due to the lower shell strength, the electrode reaction interface contact is slightly worse than that of metal shell batteries, and the expansion of the electrode sheet cannot be effectively restrained. Worse than metal case batteries
In order to avoid the adverse effects caused by the deformation and thickness expansion of the soft-packed lithium carbon fluoride primary battery during the discharge process, and to improve the capacity utilization rate of the battery, a clamp is usually used to clamp and discharge the soft-packed battery. This method greatly increases the battery life. The difficulty of combination also greatly limits the application range of lithium fluoride batteries

Method used

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  • Battery positive plate, flexible package lithium carbon fluoride primary battery and preparation method of flexible package lithium carbon fluoride primary battery
  • Battery positive plate, flexible package lithium carbon fluoride primary battery and preparation method of flexible package lithium carbon fluoride primary battery
  • Battery positive plate, flexible package lithium carbon fluoride primary battery and preparation method of flexible package lithium carbon fluoride primary battery

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preparation example Construction

[0127] See figure 2 As shown, the present invention also provides a method for preparing a soft-pack lithium carbon fluoride primary battery, comprising the following steps:

[0128] Step S1, positive electrode sheet production: mix the positive electrode active material, conductive agent and binder uniformly according to the preset mass ratio, and then disperse them in the solvent NMP to prepare the positive electrode slurry, and then evenly coat the positive electrode slurry on the The surface of the aluminum foil used as the positive current collector is then sequentially dried, rolled, and sheared to obtain the positive electrode sheet;

[0129] In the present invention, in terms of specific implementation, in step S1, the mass ratio among the positive electrode active material, the conductive agent and the binder is: (80-95):(10-2):(10-3) .

[0130] In step S1, the positive electrode sheet prepared is preferably a positive electrode sheet with a discharge expansion rat...

Embodiment 1

[0143] Prepare a soft-pack lithium carbon fluoride primary battery with a capacity of about 4650mAh. The positive active material uses 100% carbon fluoride. The carbon fluoride has the characteristics of high power discharge and high discharge platform. The average particle size of the material is 5 μm, which has Three-dimensional through-hole multi-level channel structure, including abundant macropores, mesopores and a small amount of micropores, with a specific surface area of ​​about 610m 2 / g, the actual gram capacity of the fluorinated carbon material at room temperature at 0.1C discharge is about 680mAh / g. The negative electrode active material is pure metal lithium, its theoretical gram capacity is 3860mAh / g, and its density is 0.534g / cm 3 . The total thickness of the diaphragm is 20 μm, the substrate material of the diaphragm is polyethylene PE, the thickness of the substrate of the diaphragm is 16 μm, the substrate of the diaphragm is double-sided coated with ceramic...

Embodiment 2

[0159] Prepare a soft-pack lithium carbon fluoride primary battery with a capacity of about 4650mAh. The positive active material is a mixture of carbon fluoride and electrolytic manganese dioxide, wherein carbon fluoride: manganese dioxide = 8:2 (mass ratio), and the The carbon material is the same as that in Example 1, and the actual gram capacity of electrolytic manganese dioxide discharged at room temperature at 0.1C is about 250mAh / g. The negative electrode uses pure metal lithium, its theoretical gram capacity is 3860mAh / g, and its density is 0.534g / cm 3 . The total thickness of the diaphragm is 20 μm, the substrate material is polyethylene PE, the substrate thickness is 16 μm, double-sided coating ceramic and organic binder (vinylidene fluoride-hexafluoropropylene copolymer) mixed functional coating, single-sided coating thickness is 2 μm.

[0160] The specific design and preparation method of the battery are as follows:

[0161] The first step is the preparation of ...

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Abstract

The invention discloses a battery positive plate which comprises a positive current collector, and the outer surface of the positive current collector is coated with a positive active material coating; the positive electrode active material coating comprises a positive electrode active material, a conductive agent and a binder; the positive electrode active substance is carbon fluoride or a mixture taking carbon fluoride as a main active substance; the porosity of the carbon fluoride ranges from 5% to 50%; and the sizes of carbon fluoride pores comprise one or more of macropores, mesopores andmicropores. The invention also provides a flexible package lithium carbon fluoride primary battery and a preparation method thereof. According to the invention, a carbon fluoride material with rich pore structures and high specific surface area is preferably selected as the positive electrode active substance, and the special structure and morphology of carbon fluoride reserve a space capable ofaccommodating a reaction product, so that the existing form of the reaction product is limited, and the discharge expansion of the positive plate is greatly reduced. The reasonable positive and negative electrode surface capacity design and electrode compaction density design are combined to realize the mutual balance of the thicknesses of positive and negative plates in the discharge process.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a battery positive electrode sheet, a soft-packaged lithium carbon fluoride primary battery and a preparation method thereof. Background technique [0002] Lithium / carbon fluoride (Li / CF x ) battery is a solid positive lithium primary battery that first became a commodity. Because of its theoretical mass specific energy of 2180Wh / kg, it is the highest in the positive series. It has good high temperature performance and safety performance, high and stable discharge platform, and automatic The low discharge rate has been of great concern. [0003] Compared with metal-shell batteries, soft-packed lithium fluoride batteries have obvious advantages in specific energy due to their light-weight shell, flexible size, and excellent safety performance. kinds of batteries. [0004] During the discharge process of lithium carbon fluoride battery, carbon fluoride as the positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M4/583H01M4/08H01M6/16H01M2/16
CPCH01M4/06H01M4/5835H01M4/08H01M6/16H01M2004/021H01M2004/028
Inventor 阳晓霞白宝生冯辉段征
Owner TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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