Nonaqueous electrochemical battery and preparation method thereof

An electrochemical, non-aqueous technology, used in non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as high short-circuit rate, malignant accidents, safety hazards, etc., to improve safety performance, reduce The effect of process short circuit rate

Inactive Publication Date: 2012-01-04
HUIZHOU CITY DESAY LITHIUM BATTERY S & T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the negative electrode active material is more than the positive electrode active material in the battery, there will be more negative electrode active material in the battery after the reaction. Since lithium is a high-energy material, there will be a certain safety hazard; The nickel strip is relatively sharp, and it is easy to pierce the diaphragm in extreme cases, causing a short circuit inside the battery and causing a vicious accident, so certain measures need to be taken to protect it
When a large current is discharged, only the face-to-face part of the battery can react, and the lithium ribbon is too small, which will break at the end of the discharge, which will cause the battery to fail to release the theoretical capacity.
CN1659729 relates to a kind of non-aqueous battery, it comprises lithium metal foil anode and cathode coating, and this coating comprises iron disulfide as active material, and wherein coating is added on at least one surface of metal substrate, and this metal substrate acts as cathodic current collector, but this invention still has the problems of high short circuit rate and potential safety hazards

Method used

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  • Nonaqueous electrochemical battery and preparation method thereof
  • Nonaqueous electrochemical battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the present invention, the production process of the lithium-iron disulfide battery that standard type is AA is as follows:

[0014] Using battery-grade pyrite powder, its main component is FeS 2 (purity above 96%), graphite KS-15, acetylene black, CMC and SBR for binder. Add the above substances into water in proportion, mix them with a high-speed mixer, fully wet and mix them, and test them with a Polliffer viscometer to obtain a muddy slurry with a viscosity of 5000-8000 centipoise.

[0015] The muddy slurry was coated on the surface of an aluminum foil base tape with a thickness of 0.018 mm using a transfer coating device. Adjust the transfer coating equipment to intermittently coat the muddy slurry on the surface of the aluminum foil base belt. The muddy slurry on each surface reaches 20.02mg / cm in a fully dried state 2 density per unit area. Both sides of the aluminum foil base tape are coated with muddy slurry and dried, then pressed, and the thi...

Embodiment 2

[0030] The lithium-iron disulfide battery of AA used as a comparison is manufactured by the same production process as Scheme 1, but the muddy slurry coated on each surface of the aluminum foil base tape only needs to reach about 24.23mg / cm 2 density per unit area.

Embodiment 3

[0032] The lithium-iron disulfide battery of AA used as a comparison is manufactured by the same production process as Scheme 1, but the muddy slurry coated on each surface of the aluminum foil base tape only needs to reach about 16.66mg / cm 2 density per unit area.

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Abstract

The invention belongs to the field of chemical batteries, and discloses a nonaqueous electrochemical battery and a preparation method thereof. The electrochemical battery comprises a positive electrode current collector, a negative electrode, an electrolyte and a diaphragm, wherein the positive electrode current collector comprises a positive electrode coating layer and a positive electrode coating layer wholely acting as the positive electrode; lugs are arranged on the current collector and the negative electrode; the negative electrode is metal lithium or lithium aluminum alloy; the ratio of the capacity per unit area of the positive electrode to that of the negative electrode is less than 1.0; and the ratio of the theoretical total capacity of the positive electrode to that of the negative electrode is greater than 1.0. In the preparation method, when the positive electrode diaphragm and the negative electrode are stacked by the diaphragm, the initial end of the positive electrode and the initial end of the negative electrode are stacked in a malposition way. By adopting the process, the processing short circuit rate is reduced, and the safety property of the battery is improved greatly on the premise of ensuring the high-current discharge capability.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a non-aqueous electrochemical battery and a preparation method thereof. Background technique [0002] At present, the diversification of electronic devices and the rapid upgrading of miniaturization have promoted the progress of batteries, requiring batteries with high specific energy, specific power, long life, reasonable price, and convenient use. The rapid development of small electrical appliances has doubled the number of orders required by the small civilian battery market, and requires many varieties, long shelf life, high primary capacity, and small size. Lithium-iron disulfide batteries are well suited to this development trend. As a lithium-iron disulfide battery, it is necessary to find a balance between good high-current discharge capacity and good safety performance. If the negative electrode active material is more than the positive electrode active material in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/06H01M6/16H01M50/119
CPCY02E60/122H01M4/62H01M4/58H01M10/052H01M10/4235H01M4/13H01M4/134H01M4/0404H01M4/06H01M4/04H01M2010/4292H01M4/525H01M4/133H01M4/1393H01M10/0568H01M4/485H01M4/505H01M4/587H01M4/621H01M4/382H01M6/16Y02E60/12H01M4/136H01M4/1397H01M4/5815H01M4/625H01M4/661H01M10/0569H01M10/0587Y10T29/49115Y02E60/10Y02P70/50H01M50/119
Inventor 何献文劳忠奋潘文硕
Owner HUIZHOU CITY DESAY LITHIUM BATTERY S & T CO LTD
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