WO2013099816A1 - 溶融塩電池および溶融塩電池の製造法 - Google Patents
溶融塩電池および溶融塩電池の製造法 Download PDFInfo
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- WO2013099816A1 WO2013099816A1 PCT/JP2012/083322 JP2012083322W WO2013099816A1 WO 2013099816 A1 WO2013099816 A1 WO 2013099816A1 JP 2012083322 W JP2012083322 W JP 2012083322W WO 2013099816 A1 WO2013099816 A1 WO 2013099816A1
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- battery
- molten salt
- separator
- salt
- negative electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
- H01M10/39—Accumulators not provided for in groups H01M10/05-H01M10/34 working at high temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
- H01M10/39—Accumulators not provided for in groups H01M10/05-H01M10/34 working at high temperature
- H01M10/399—Cells with molten salts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49115—Electric battery cell making including coating or impregnating
Definitions
- the present invention relates to a molten salt battery, which is a secondary battery using molten salt as an electrolyte, and a method for manufacturing the same.
- the present invention particularly relates to a method for effectively incorporating an electrolyte salt into a molten salt battery.
- lithium ion secondary batteries which are non-aqueous electrolyte secondary batteries, have been widely used as power sources for portable devices such as mobile phones, notebook computers, and digital cameras. Further, in recent years, lithium ion secondary batteries have attracted attention as large-sized and large-capacity power supplies for electric vehicles such as electric vehicles and electric motorcycles and hybrid vehicles.
- the lithium ion secondary battery has the following problems.
- Non-patent Document 1 a sodium ion secondary battery using a molten salt as an electrolyte has been developed as a new battery that improves the problems of the lithium ion secondary battery.
- a sodium ion secondary battery (hereinafter referred to as a molten salt battery) using this molten salt as an electrolyte uses sodium that is present more abundantly than lithium on the earth. Furthermore, a molten salt battery using an incombustible molten salt as an electrolyte does not run out of heat even if a part of the battery generates heat or ignites, so it can be said to be an extremely safe battery.
- Molten salt has excellent properties such as non-volatility, incombustibility, and high ion concentration. In order to maintain a molten state, the molten salt is usually maintained at a high temperature. A molten salt having a melting point of less than 100 ° C. is also called an ionic liquid.
- Non-patent Document 1 a molten salt battery having a high energy density and high safety can be constructed using a molten salt having a low melting point of 57 ° C. (a mixture of NaFSA and KFSA * 1 ) (Non-patent Document 1).
- the electrolyte salt has been injected into the battery in the form of a molten salt. That is, after incorporating power generation elements such as a positive electrode, a negative electrode, and a separator into the battery, the battery body and the electrolyte salt are heated to a temperature equal to or higher than the melting point of the electrolyte salt, and the molten salt is injected into the battery body. By this operation, the molten salt penetrates into power generation elements such as the positive electrode, the negative electrode, and the separator, and an electrolyte is formed.
- the molten salt electrolyte may have a relatively high viscosity, it is difficult for the molten salt electrolyte to diffuse and penetrate uniformly into the power generation element of the battery, and the molten salt electrolyte does not sufficiently penetrate into the power generation element. May occur.
- a lot of time, equipment, and labor may be required for aging treatment for reliably infiltrating the molten salt electrolyte.
- An object of the present invention is to solve the problems of such a molten salt injection method and to provide an effective method for producing a molten salt battery capable of forming a molten salt electrolyte in a uniform amount with high reproducibility.
- the inventors have used a solid electrolyte salt at room temperature as an electrolyte, and held the solid electrolyte salt in at least one of the electrode and separator before storing the electrode and separator in the battery case.
- the method of assembling a battery by putting at least one of an electrode holding a solid electrolyte salt and a separator in the battery case eliminates the need for injecting the molten salt into the battery case, and solves the above problem. I found it.
- the present invention relates to a molten salt battery manufacturing method and a molten salt battery described below.
- a method for manufacturing a molten salt battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte salt that is solid at room temperature.
- the step of holding the solid electrolyte salt on at least one surface of the positive electrode, the negative electrode, and the separator may be a step of covering the surface with a powdered electrolyte salt.
- the solid electrolyte salt is heated into a semi-solid or liquid, and the semi-solid or liquid electrolyte It may be a step of applying a salt to the surface.
- the application may be performed by spray application.
- the step of holding the solid electrolyte salt on at least one surface of the positive electrode, the negative electrode, and the separator comprises heating the solid electrolyte salt to form a molten salt, and at least one of the positive electrode, the negative electrode, and the separator is It may be carried out by immersing in molten salt and then pulling it up.
- the step of holding the solid electrolyte salt on at least one surface of the positive electrode, the negative electrode, and the separator may be performed by laminating the solid electrolyte salt formed into a plate shape on the surface.
- molten salt battery manufactured by the above method for manufacturing a molten salt battery.
- the step of pouring the electrolyte into the battery case becomes unnecessary.
- the manufacturing process can be simplified, and the manufacturing cost can be reduced and the manufacturing efficiency can be improved.
- the molten salt electrolyte can be uniformly formed in a uniform amount with good reproducibility, and the performance and quality of the molten salt battery are stabilized.
- a part of the electrolyte material may be incorporated into the battery by the method of the present invention, and the remaining part of the electrolyte material may be incorporated into the battery by a conventional molten salt injection method.
- a method combining the method of the present invention and the molten salt injection method is effective for quickly and uniformly diffusing and penetrating the molten salt electrolyte into the battery.
- the molten salt battery basically includes a positive electrode 11 composed of a positive electrode current collector carrying a positive electrode active material on its surface, and a negative electrode current collector carrying a negative electrode active material on its surface.
- a pressing member 16 including a pressing plate 14 and a spring 15 that presses the pressing plate 14 is disposed between the upper surface of the battery case 17 and the negative electrode. Even when the volumes of the positive electrode 11, the negative electrode 12, and the separator 13 are changed, the pressure applied by the pressing member 16 can keep the positive electrode 11 and the negative electrode 12 in contact with the separator 13.
- the positive electrode current collector and the negative electrode current collector are connected to the positive electrode terminal 18 and the negative electrode terminal 19 via lead wires 20, respectively.
- Examples of the separator include polyethylene and polypropylene microporous membranes.
- alkali metals such as sodium (Na), potassium (K), lithium (Li), rubidium (Rb) and cesium (Cs), beryllium (Be), magnesium (Mg), calcium (Ca ),
- alkaline earth metals such as strontium (Sr) and barium (Ba).
- FSA bis (fluorosulfonyl) amide
- TFSA bis (trifluoromethylsulfonyl) amide
- BETA bis (pentafluoroethylsulfonyl) amide
- the melting point of the electrolyte salt it is preferable to use a mixture of two or more salts.
- KFSA KN (SO 2 F) 2 ; potassium bis (fluorosulfonyl) amide
- NaFSA Na—N (SO 2 F) 2 ; sodium bis (fluorosulfonyl) amide
- the melting point Decreases to the eutectic temperature of 61 ° C.
- the battery operating temperature can be made 90 ° C. or lower.
- the separator is used to prevent physical contact between the positive electrode and the negative electrode.
- a glass nonwoven fabric, a porous resin, or the like can be used as the separator.
- the separator is impregnated with molten salt.
- the positive electrode, the negative electrode, and the separator impregnated with the electrolyte salt are stacked and accommodated in the battery case. In this case, the electrolyte salt impregnated in the separator melts at the operating temperature of the battery, and is diffused and distributed to the positive electrode and the negative electrode that are in contact with the separator.
- FIG. 2 shows a cross-sectional view of a molten salt battery in which an electrode laminate 22 in which a positive electrode plate 23, a separator 24, and a negative electrode plate 25 are laminated in this order is housed in a battery case 21.
- a positive electrode tab is provided at each end of the plurality of positive electrode plates 23, and a positive electrode lead is connected to the positive electrode tab.
- the negative electrode tab is provided in each one end of the some negative electrode plate 25, and a negative electrode lead is connected to this. These leads are drawn out from the battery case 21 to the outside.
- An electrolyte salt is sealed inside the battery case 21.
- FIG. 3 shows a perspective view of an electrode laminate formed by winding a long electrode.
- the wound electrode laminate 30 includes a positive electrode 31, a negative electrode 32, a separator 33, and a separator 34.
- the separator 33, the negative electrode 32, the separator 34, and the positive electrode 31 are stacked and wound in this order, and then formed into a flat shape by being pressurized and stored in a battery case.
- a positive electrode tab is joined to the positive electrode 31, and a negative electrode tab is joined to the negative electrode 32, respectively.
- An electrolyte salt is sealed inside the battery case in which the wound electrode laminate is stored.
- a method for manufacturing the laminated molten salt battery shown in FIG. 2 will be described as an embodiment according to the method for manufacturing the molten salt battery of the present invention.
- these embodiments are illustrative, and the present invention is not limited by these embodiments, and the scope of the present invention is indicated by the claims.
- the equivalents of the invention recited in the claims and all modifications within the scope of the claims are included in the scope of the present invention.
- Embodiment 1 In this embodiment, a powdered electrolyte salt is used.
- the powdered electrolyte salt can be obtained, for example, by pulverizing the bulk electrolyte salt with a pulverizer or by spraying the molten salt into a cold space and solidifying it.
- a powdered electrolyte salt is dissolved in a general organic solvent to prepare a solution, and an electrode is prepared using this solution. Then, the organic solvent is removed by evaporation during the drying process of the electrode. Also good.
- a solution obtained by dissolving a powdered electrolyte salt in a general organic solvent is applied to the surface of an electrode or a separator (hereinafter referred to as “electrode”), and the organic solvent is removed by evaporation in the drying process. Good.
- the battery case is sealed.
- the “surface” of the electrode or the like holding the electrolyte salt may be only the outer surface of the positive electrode, the negative electrode, and the separator, may be only the inner surface, or both the outer surface and the inner surface. May be.
- a semi-solid or liquid electrolyte salt is used.
- the semi-solid electrolyte salt can be obtained by heating the powdered electrolyte salt to such an extent that it is not completely melted. That is, the semi-solid state refers to a relatively high viscosity solid-liquid mixed state including a semi-solid state.
- the liquid electrolyte salt can be obtained by heating and melting the electrolyte salt.
- the electrolyte salt can be made semi-solid by adjusting the composition of each component of the electrolyte salt.
- a semi-solid or liquid electrolyte salt is applied to the surface of an electrode or the like by any application means such as a brush, an application roll, a roll coater, a bar coater, a doctor blade, a wire bar, a screen, or a discharger.
- any application means such as a brush, an application roll, a roll coater, a bar coater, a doctor blade, a wire bar, a screen, or a discharger.
- the electrolyte salt may be applied in a linear shape, a strip shape, a lattice shape, a multipoint shape, or the like. In this case, however, the electrolyte salt is applied so as to be evenly distributed over the entire application surface.
- an electrode laminated body is formed using an electrode or the like coated with an electrolyte salt, and the battery case is sealed after the electrode stack is stored in the battery case.
- a semi-solid or liquid electrolyte salt is applied to the surface of an electrode or the like using a spray device.
- the coating amount can be adjusted by adjusting the temperature of the electrolyte salt, the spraying amount, and the spraying time.
- an electrode laminated body is formed using an electrode or the like coated with an electrolyte salt, and the battery case is sealed after the electrode stack is stored in the battery case.
- the molten salt electrolyte is accommodated in an immersion tank, and an electrode or the like is immersed in the immersion tank, pulled up, and then cooled to adhere and impregnate the electrolyte salt on the surface of the electrode or the like.
- the amount of adhesion and the amount of impregnation of the electrolyte salt can be adjusted by adjusting the temperature of the molten salt electrolyte or adjusting the composition of each component of the molten salt electrolyte.
- the electrodes or the like may be immersed one by one in the molten salt electrolyte, or a plurality of electrodes may be stacked and then immersed in the molten salt electrolyte.
- an excess molten salt electrolyte may adhere to the electrode or the like pulled up after being immersed. This excess molten salt electrolyte can be removed by applying any of vibration, centrifugation, pressurization, or gas blowing to the electrode or the like.
- an electrode laminated body is formed using an electrode or the like to which an electrolyte salt is attached and impregnated, and the battery case is sealed after the electrode stack is stored in the battery case.
- a plate-like electrolyte salt is used.
- the plate-like electrolyte salt is obtained, for example, by applying a molten salt electrolyte on a support sheet and solidifying it. After stacking the plate-like electrolyte salt layer on the support sheet and the electrode so that the electrolyte salt layer is in direct contact with the surface of the electrode or the like, the support sheet is peeled off to form a plate (layer-like) ) Can be held on the surface of an electrode or the like.
- the electrolyte salt, the positive electrode, the negative electrode, and the separator material easily adsorb moisture during the manufacturing process of the molten salt battery.
- the performance of the molten salt battery is deteriorated by moisture adsorption. Therefore, it is desirable that the manufacturing process of the molten salt battery is performed in an inert gas such as nitrogen or argon, or in dry air so that moisture adsorption hardly occurs.
- Example 1 (Preparation of negative electrode) A negative electrode current collector was used in which a sputtered film of zinc (Zn) having a thickness of 130 nm was formed on the surface of an aluminum (Al) piece having a thickness of 20 ⁇ m and a size of 10 cm ⁇ 10 cm. On this negative electrode current collector, sodium (Na) moving from the positive electrode is deposited during charging. (Preparation of positive electrode) As the positive electrode current collector, an Al current collector having a thickness of 20 ⁇ m and a size of 10 cm ⁇ 10 cm was used.
- NaCrO 2 was used as the positive electrode active material.
- acetylene black was used as the conductive assistant, and PVDF was used as the binder.
- a positive electrode active material, a conductive additive, and a binder were mixed at a ratio of 85: 10: 5, and N-methyl-2-pyrrolidone (NMP) was added as appropriate to make a paste.
- the paste was applied to the Al current collector, dried, and pressed to a thickness of 50 ⁇ m to obtain a positive electrode.
- electrolyte salt As the electrolyte salt, a mixture in which NaFSA and KFSA were mixed at a ratio of 1: 1 was used.
- Separatator As the separator, a microporous polypropylene film having a thickness of 50 ⁇ m was used. (Production of electrode laminate) Powdered electrolyte salt was sprayed on the surface of the separator.
- the negative electrode was placed on the separator, and powdered electrolyte salt was dispersed on the negative electrode surface.
- another separator was placed on the negative electrode, and powdered electrolyte salt was sprayed on the surface of the other separator.
- the positive electrode was placed on the other separator, and powdered electrolyte salt was sprayed on the surface of the positive electrode.
- the electrode laminated body holding electrolyte salt was produced.
- the 10-cell molten salt battery produced by the conventional molten salt injection method increases the capacity of the battery as the number of charge / discharge cycles increases, and on average approximately 6 cycles of charging until reaching the maximum capacity. Discharge required.
- the battery of this example showed less discharge capacity variation than the battery produced by the molten salt injection method, and showed a discharge capacity that was about 3% higher.
- Example 2 In Example 1, the powdered electrolyte salt was heated to a semisolid state, and this semisolid electrolyte was applied to the separator, the negative electrode, and the positive electrode using a brush. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 3 In Example 1, the electrolyte salt was heated to form a liquid, and this liquid electrolyte salt was applied to the separator, the negative electrode, and the positive electrode using a spray device. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 4 the electrolyte salt is put into an impregnation tank of a vacuum impregnation apparatus and heated to be in a liquid state. After the separator, the negative electrode, and the positive electrode are immersed in this liquid electrolyte salt, the electrode laminate is laminated by laminating them. Produced. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 5 In Example 1, an electrolyte salt is put into an impregnation tank of a vacuum impregnation apparatus and heated to be in a liquid state, and an electrode laminate composed of repeating units of [separator / negative electrode / separator / positive electrode] is added to the liquid electrolyte salt. The electrolyte salt was held on the electrode or the like by pulling up after immersion. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 6 the molten salt electrolyte is made semi-solid, and this is applied to the surface of the fluororesin sheet with a brush to form an electrolyte salt layer.
- the electrolyte salt layer is placed on the surfaces of the separator, the negative electrode, and the positive electrode, respectively.
- the molten salt electrolyte layer was held on the electrode or the like by placing and removing the fluororesin sheet. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 1 The obtained battery was evaluated in the same manner as in Example 1. As a result, these batteries exhibited the same characteristics as in Example 1. [Reference Example 1] After the electrode laminate produced in Example 1 was housed in a battery case, a molten salt electrolyte was further injected into the battery case, and then the battery case was sealed. Otherwise, the battery was fabricated in the same manner as in Example 1.
- Example 1 The obtained battery was evaluated in the same manner as in Example 1. As a result, these batteries exhibited the same characteristics as in Example 1.
Abstract
Description
KFSA(カリウムビス(フルオロスルフォニル)アミド)
この溶融塩電池を製造する工程において、従来、電解質塩は溶融塩の状態で電池内へ注入されていた。すなわち、正極、負極、セパレータなどの発電要素を電池内に組込んだ後、電池本体及び電解質塩を、その電解質塩の融点以上の温度に加熱し、電池本体に溶融塩を注入していた。この操作により溶融塩は正極、負極、セパレータなどの発電要素内に浸透し、電解質が形成される。
(実施形態1)
本実施形態では、粉末状の電解質塩を用いる。粉末状の電解質塩は、例えば塊状の電解質塩を粉砕機で粉砕するか、溶融塩を冷空間に噴霧して固化することによって得ることができる。
(実施形態2)
本実施形態では半固体状又は液体状の電解質塩を用いる。半固体状の電解質塩は、前記の粉末状の電解質塩を完全に溶融しない程度に加熱することによって得ることができる。即ち、半固体状とは、半凝固状態を含む、比較的高粘性の固液混合状態を指す。また、液体状の電解質塩は電解質塩を加熱して溶融させることによって得ることができる。電解質塩の各成分の配合組成を調整することによって電解質塩を半固体状にすることもできる。
(実施形態3)
本実施形態では半固体状又は液体状の電解質塩を、スプレー装置を用いて電極等の表面に塗布する。塗布量は電解質塩の温度、吹き付け量、及び吹き付け時間を調整することによって調節することができる。
(実施形態4)
本実施形態では、溶融塩電解質を浸漬槽に収容し、これに電極等を浸漬して引き上げ、次いで冷却することによって電極等の表面に電解質塩を付着及び含浸させる。
(実施形態5)
本実施形態では板状の電解質塩を用いる。板状の電解質塩は、例えば、支持体シート上に溶融塩電解質を塗布し固化することによって得られる。この電解質塩の層が電極等の表面と直接接触するように、支持体シート上の板状の電解質塩の層と電極等とを重ねた後、支持体シートを剥離することによって板状(層状)の電解質塩を電極等の表面に保持することができる。
(負極の作製)
負極用集電体として、厚さ20μmで大きさが10cm×10cmのアルミニウム(Al)片の表面に厚さ130nmの亜鉛(Zn)のスパッタ膜を形成したものを使用した。この負極集電体上には、充電時、正極から移動するナトリウム(Na)が析出する。
(正極の作製)
正極用集電体として厚さ20μmで大きさが10cm×10cmのAl集電体を使用した。
(電解質塩)
電解質塩としては、NaFSA及びKFSAを1:1の比率で混合した混合物を使用した。
(セパレータ)
セパレータとしては厚さ50μmの微孔性ポリプロピレンフィルムを用いた。
(電極積層体の作製)
セパレータの表面に粉末状電解質塩を散布した。次いで、このセパレータの上に負極を載置し、負極表面に粉末状電解質塩を散布した。次いで、この負極の上に別のセパレータを載置し、この別のセパレータの表面に粉末状電解質塩を散布した。次いで、この別のセパレータの上に正極を載置し、正極表面に粉末状電解質塩を散布した。このようにして、電解質塩を保持した電極積層体を作製した。
(電池の作製)
上記のように作製した電極積層体を電池ケースに収納し、電池ケースを密封して合計10セルの電池を作製した。
(電池の評価)
電池全体の温度を90℃に加熱し充放電を行ったところ、本実施例の電池はいずれも初期から電池の100%の容量が得られた。これに対し、従来の溶融塩注入法によって作製した10セルの溶融塩電池は、充放電サイクルの回数が増えるにつれて電池の容量が上昇し、最高容量に達するまでに、平均でほぼ6サイクルの充放電を要した。
[実施例2]
実施例1において、粉末状電解質塩を加熱して半固体状とし、この半固体状電解質を刷毛を用いて、セパレータ、負極、正極に塗布した。それ以外は実施例1と同様にして電池を作製した。
[実施例3]
実施例1において、電解質塩を加熱して液体状とし、この液体状電解質塩をスプレー装置を用いて、セパレータ、負極、正極に塗布した。それ以外は実施例1と同様にして電池を作製した。
[実施例4]
実施例1において、電解質塩を真空含浸装置の含浸槽に入れて加熱して液体状とし、この液体状電解質塩に、セパレータ、負極、正極を浸漬したのち、それらを積層して電極積層体を作製した。それ以外は実施例1と同様にして電池を作製した。
[実施例5]
実施例1において、電解質塩を真空含浸装置の含浸槽に入れて加熱して液体状とし、この液体状電解質塩に、[セパレータ/負極/セパレータ/正極]のユニットの繰り返しからなる電極積層体を浸漬したのちに引き上げることにより電解質塩を電極等に保持した。それ以外は実施例1と同様にして電池を作製した。
[実施例6]
実施例1において、溶融塩電解質を半固体状にし、これをフッ素樹脂シート表面に刷毛で塗布して電解質塩の層を形成し、この電解質塩の層をセパレータ、負極、正極の表面にそれぞれ載置してフッ素樹脂シートを剥離除去することにより、電極等に溶融塩電解質の層を保持した。それ以外は実施例1と同様にして電池を作製した。
[参考例1]
実施例1において作製した電極積層体を電池ケースに収納したのち、さらに溶融塩電解質を電池ケース内に注入し、次いで電池ケースを密封した。それ以外は実施例1と同様にして電池を作製した。
Claims (8)
- 正極、負極、前記正極と負極との間に配置されたセパレータ、及び常温で固体状の電解質塩を備えた溶融塩電池の製造方法であって、
電池を組み立てる前に、固体状の電解質塩を正極、負極及びセパレータの少なくとも一つの表面に保持する工程と、
前記正極、前記負極及び前記セパレータを電池ケースに収容して電池を組み立てる工程と
を備えることを特徴とする溶融塩電池の製造方法。 - 前記固体状の電解質塩を正極、負極及びセパレータの少なくとも一つの表面に保持する工程が、粉末状の電解質塩で前記表面を被覆する工程であることを特徴とする請求項1に記載の溶融塩電池の製造方法。
- 前記固体状の電解質塩を正極、負極及びセパレータの少なくとも一つの表面に保持する工程が、前記固体状の電解質塩を加熱して半固体状又は液体状とし、この半固体状又は液体状の電解質塩を前記表面に塗布する工程であることを特徴とする請求項1に記載の溶融塩電池の製造方法。
- 前記塗布がスプレー塗布によって行われることを特徴とする請求項3に記載の溶融塩電池の製造方法。
- 前記固体状の電解質塩を正極、負極及びセパレータの少なくとも一つの表面に保持する工程が、前記固体状の電解質塩を加熱して溶融塩を形成させ、正極、負極及びセパレータの少なくとも一つを前記溶融塩に浸漬したのち引き上げることによって行われることを特徴とする請求項1に記載の溶融塩電池の製造方法。
- 引き上げられた前記正極、負極及びセパレータの少なくとも一つに振動を付与するか、気体を吹き付けるか、または引き上げられた前記正極、負極及びセパレータの少なくとも一つを遠心分離にかけることによって、前記正極、負極及びセパレータの少なくとも一つに付着した余分な溶融塩を除去することを特徴とする請求項5に記載の溶融塩電池の製造方法。
- 前記固体状の電解質塩を正極、負極及びセパレータの少なくとも一つの表面に保持する工程が、板状に成形した前記固体状の電解質塩を前記表面に積層することによって行われることを特徴とする請求項1に記載の溶融塩電池の製造方法。
- 請求項1~7のいずれか一項に記載の溶融塩電池の製造方法によって製造されたことを特徴とする溶融塩電池。
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