A kind of battery positive electrode sheet, flexible packaging lithium carbon fluoride primary battery and preparation method thereof

A battery positive electrode and carbon fluoride technology, which is applied in the direction of the primary battery electrode, battery electrode, positive electrode, etc., can solve the problems of uneven thickness variation of the positive electrode sheet, battery thickness expansion, and increased spacing, so as to improve the capacity utilization rate , good interface contact, reduce the effect of discharge expansion

Active Publication Date: 2022-07-19
TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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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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  • A kind of battery positive electrode sheet, flexible packaging lithium carbon fluoride primary battery and preparation method thereof
  • A kind of battery positive electrode sheet, flexible packaging lithium carbon fluoride primary battery and preparation method thereof
  • A kind of battery positive electrode sheet, flexible packaging lithium carbon fluoride primary battery and preparation method thereof

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preparation example Construction

[0127] In order to prepare and obtain the above-mentioned flexible packaging lithium carbon fluoride primary battery provided by the present invention, refer to figure 2 As shown, the present invention also provides a preparation method of a flexible packaging lithium carbon fluoride primary battery, comprising the following steps:

[0128] Step S1, production of the positive electrode sheet: the positive electrode active material, the conductive agent and the binder are mixed uniformly according to the preset mass ratio, and then dispersed in the solvent NMP to prepare the positive electrode slurry, and then the positive electrode slurry is uniformly coated on the The surface of the aluminum foil used as the positive electrode current collector is then dried, rolled and sheared in sequence to obtain a positive electrode piece;

[0129] In the present invention, in terms of specific implementation, in step S1, the mass ratio between the positive electrode active material, the...

Embodiment 1

[0143] A flexible packaging lithium carbon fluoride primary battery with a capacity of about 4650mAh was prepared. The positive electrode active material was made of 100% carbon fluoride. The carbon fluoride has the characteristics of high power discharge and high discharge platform. 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 fluorocarbon material discharged at 0.1C at room temperature is about 680mAh / g. The negative electrode active material is pure metal lithium with a theoretical gram capacity of 3860mAh / g and a density of 0.534g / cm 3 . The total thickness of the separator is 20 μm, the base material of the separator is polyethylene PE, the thickness of the base of the separator is 16 μm, and the base of the separator is coated on both sides with a hybrid function of ceramic and organic binder (viny...

Embodiment 2

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

[0160] The specific design and preparation method of the battery are a...

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Abstract

The invention discloses a positive electrode sheet of a battery, comprising a positive electrode current collector, the outer surface of the positive electrode current collector is coated with a positive electrode active material coating; the positive electrode active material coating comprises a positive electrode active material, a conductive agent and a binder; the positive electrode The active material adopts carbon fluoride or a mixture of carbon fluoride as the main active material; the porosity of carbon fluoride ranges from 5 to 50%; the size of the pores of carbon fluoride includes one of macropores, mesopores and micropores. one or more. The present invention also provides a soft-packed lithium carbon fluoride primary battery and a preparation method thereof. The present invention preferably uses a carbon fluoride material with rich pore structure and high specific surface as the positive electrode active material, and the special structure and morphology of carbon fluoride are reserved for The space that can accommodate the reaction product limits the existing form of the reaction product, and greatly reduces the discharge expansion of the positive electrode sheet. Combined with reasonable positive and negative electrode surface capacity design and electrode compaction density design, the thickness of positive and negative electrode sheets can be balanced in the discharge process.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/06H01M4/583H01M4/08H01M6/16H01M50/449H01M50/446
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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