Method for producing a lithium secondary battery

a secondary battery and lithium ion battery technology, applied in secondary cell manufacturing, cell components, nickel accumulators, etc., can solve the problems of difficult to achieve high energy density of lithium ion batteries, and generation of dendrites of lithium (tree branch-like crystals). achieve the effect of long cycle li

Inactive Publication Date: 2007-08-09
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] An object of the present invention is to provide a lithium, lithium alloy, zinc or zinc alloy secondary battery capable of overcoming the foregoing problems associated with the conventional secondary batteries and exhibiting a long cycle life.
[0014] In order to overcome the foregoing problems of the conventional technology, the inventors of the present invention have made energetic studies. As a result, it was found that generation of dendrites of lithium or zinc can be prevented by forming a film permitting ions relating to battery reactions to pass through on the surface of the negative pole.

Problems solved by technology

Since global warming is expected due to the greenhouse effect caused by an increase in CO2 and so forth, the construction of thermal power plants has become problematic.
However the lithium ion battery has not achieved the high energy density that is the original characteristic of the lithium battery which uses the metal lithium as the negative pole activating material.
The reason why a large capacity lithium accumulator of the type that uses lithium metal as the negative pole has not been put into practical use is that the generation of dendrites of lithium (tree branch-like crystals), which are the main cause of short circuiting, cannot be prevented.
The lithium battery, nickel-zinc battery and the air-zinc battery are problematic in that lithium or zinc is, as described above, deposited on the surface of the negative pole at the time of charge.
The deposited metal grows (dendrites) in the form of tree branches upon charging and discharging, while penetrating the separator until it reaches the positive pole, causing a short circuit.
It leads to a short circuit between the negative pole and the positive pole, resulting in that charging cannot be performed.
If the short circuit is extensive, the energy of the battery will be consumed in a very short time, causing the generation of heat.
In the worst, an accidental exposure or fire can be generated.
Therefore, the foregoing conventional technology suffers from an excessively short cycle life.

Method used

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  • Method for producing a lithium secondary battery

Examples

Experimental program
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Effect test

example 1-1

[0416] A flat type battery having a simple structure, exhibiting assembling easiness and having a cross-sectional structure schematically shown in FIG. 2 was assembled to evaluate the characteristics of the secondary battery while mainly evaluating the life against cycle operation.

[0417] First, a solution in which colloidal silica manufactured by Shokubai Kasei and subjected to hydrophobic treatment in an atmosphere of dry argon gas was dispersed in N,N-dimethylformamide was dehydrated by active alumina. Then, lithium metal foil to which titanium mesh collector 200 was pressed against the reverse side was immersed in the colloidal silica solution prepared by the foregoing method, and then dried at 120° C. so that a lithium negative pole 201 covered with silica was manufactured.

[0418] A positive pole activating material 203 was manufactured in such a manner that a mixture of dehydrated and electrolyzed manganese dioxide and lithium carbonate was heated so that a lithium-manganese c...

example 1-2

[0423] A battery similar to that according to Example 1-1 was manufactured.

[0424] The preparation of the materials and assembly were performed in an atmosphere of dry argon similarly to Example 1-1.

[0425] First, aluminum trichloride and phosphoric acid were allowed to react with each other in ethyl alcohol, and gradually heated to 100° C. so that glass-form aluminum phosphate was obtained. Then, it was dispersed in n-hexane so that a film forming solution was prepared. The film forming solution was applied to a lithium metal foil to which the titanium mesh collector was pressed. Then, a film was formed at 120° C. Then, similar processes to those according to Example 1-1 were performed so that a lithium battery was manufactured.

example 1-3

[0426] A battery similar to that according to Example 1-1 was manufactured.

[0427] The preparation of the materials and assembly were performed in an atmosphere of dry argon similarly to Example 1-1.

[0428] First, acetic acid and water were added to an ethyl alcohol solution of tetrabutoxytitanium to be hydrolyzed. Then, diethylamine was added so that colloidal titanium oxide was formed. Then, colloidal titanium oxide was dissolved in a xylene solution of polyethylene so that a film forming solution was prepared. The film forming solution was applied to the lithium metal foil to which the stainless mesh collector was pressed followed by drying it at 1000° C. Then, electron beams were applied to crosslink the polyethylene so that a film was formed. Then, similar processes to those according to Example 1-1 were performed so that a lithium battery was manufactured.

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Abstract

A secondary battery exhibiting a long cycle life and comprising a negative pole activating material made of lithium or zinc is provided. The battery at least having a negative pole made of lithium or zinc serving as the negative pole activating material, an electrolyte (electrolytic solution), a separator, a positive pole made of a positive pole activating material, a collecting electrode and a battery case, wherein at least the surface of the negative pole is covered with a film having a structure which allows ions relating to the battery reactions to pass through. Since growth of dendrites of lithium or zinc at the time of charge can be prevented, short circuiting between the negative pole and the positive pole can be prevented. Therefore, the charge / discharge cycle life can significantly be lengthened. As a result, a lithium secondary battery, a nickel-zinc secondary battery, an air-zinc secondary battery, a bromine-zinc secondary battery and a silver oxide-zinc secondary battery of long cycle life can be manufactured.

Description

[0001] This application is a division of application Ser. No. 08 / 979,464, filed Nov. 26, 1997, which is a division of application Ser. No. 08 / 159,141, filed Nov. 30, 1993, now U.S. Pat. No. 5,824,434. Both prior applications are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a secondary battery which can repeatedly be used. More particularly, this invention relates to a reliable secondary battery capable of preventing short circuits due to dendrite growth, even when the battery is repeatedly charged and discharged. [0004] 2. Related Background Art [0005] Since global warming is expected due to the greenhouse effect caused by an increase in CO2 and so forth, the construction of thermal power plants has become problematic. Accordingly, it has been considered feasible to perform so-called load levelling for the purpose of effectively using generators by accumulating electric power at night in seconda...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/04H01M2/14H01M2/16H01M4/02H01M4/04H01M4/13H01M4/131H01M4/133H01M4/134H01M4/139H01M4/1391H01M4/24H01M4/36H01M4/40H01M4/42H01M4/48H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M4/58H01M4/62H01M4/74H01M4/80H01M10/05H01M10/052H01M10/056H01M10/058H01M10/0585H01M10/0587H01M10/24H01M10/36
CPCH01M2/14Y10T29/49108H01M4/02H01M4/04H01M4/0402H01M4/0404H01M4/0409H01M4/0414H01M4/0416H01M4/0419H01M4/0421H01M4/0426H01M4/0428H01M4/043H01M4/0435H01M4/0438H01M4/045H01M4/0452H01M4/0466H01M4/0471H01M4/13H01M4/131H01M4/133H01M4/134H01M4/139H01M4/1391H01M4/24H01M4/244H01M4/36H01M4/366H01M4/38H01M4/40H01M4/42H01M4/48H01M4/485H01M4/505H01M4/525H01M4/58H01M4/581H01M4/582H01M4/62H01M4/621H01M4/622H01M4/623H01M4/625H01M4/74H01M4/742H01M4/808H01M10/05H01M10/052H01M10/056H01M10/058H01M10/0585H01M10/0587H01M10/24H01M10/30H01M12/08H01M2004/027Y02E60/122Y02E60/124H01M2/1673H01M50/46Y02E60/10
Inventor KAWAKAMI, SOICHIROMISHINA, SHINYAKOBAYASHI, NAOYA
Owner CANON KK
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