JP2014025148A - Aluminum porous sintered compact - Google Patents
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- JP2014025148A JP2014025148A JP2013185028A JP2013185028A JP2014025148A JP 2014025148 A JP2014025148 A JP 2014025148A JP 2013185028 A JP2013185028 A JP 2013185028A JP 2013185028 A JP2013185028 A JP 2013185028A JP 2014025148 A JP2014025148 A JP 2014025148A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 95
- 239000011148 porous material Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- 229910018575 Al—Ti Inorganic materials 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 10
- 235000010210 aluminium Nutrition 0.000 description 91
- 239000010936 titanium Substances 0.000 description 43
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 41
- 229910052719 titanium Inorganic materials 0.000 description 40
- 239000000843 powder Substances 0.000 description 39
- 238000005245 sintering Methods 0.000 description 30
- 238000000034 method Methods 0.000 description 26
- 239000002245 particle Substances 0.000 description 26
- -1 titanium hydride Chemical compound 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 18
- 239000000203 mixture Substances 0.000 description 16
- 229910000048 titanium hydride Inorganic materials 0.000 description 16
- 239000002994 raw material Substances 0.000 description 14
- 239000011230 binding agent Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010304 firing Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 230000008018 melting Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 239000011149 active material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000007774 positive electrode material Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000010944 ethyl methyl cellulose Nutrition 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000013022 formulation composition Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920003087 methylethyl cellulose Polymers 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Powder Metallurgy (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
本発明は、特に、リチウムイオン二次電池や電気二重層型キャパシタの集電体に適したアルミニウム多孔質焼結体に関するものである。 The present invention particularly relates to an aluminum porous sintered body suitable for a current collector of a lithium ion secondary battery or an electric double layer capacitor.
現在、リチウムイオン電池や電気二重層型のキャパシタの正極集電体として一般的にアルミニウム箔が用いられている。そして、近年、これらの電池やキャパシタが電気自動車などにも用いられるようになり、そのような用途拡大に伴って電池やキャパシタにおける電極集電体の高出力化、高エネルギー密度化が要求され、特許文献1および2に示すように、電極集電体として三次元網目構造の開気孔を有するアルミニウム多孔質体が知られるようになりつつある。 At present, an aluminum foil is generally used as a positive electrode current collector of a lithium ion battery or an electric double layer type capacitor. And in recent years, these batteries and capacitors have come to be used for electric vehicles, etc., and with such expansion of applications, higher output and higher energy density of electrode current collectors in batteries and capacitors are required, As shown in Patent Documents 1 and 2, an aluminum porous body having open pores having a three-dimensional network structure is becoming known as an electrode current collector.
このようなアルミニウム多孔質体の製造方法としては、例えば、特許文献3に開示されるように、溶融アルミニウムに増粘剤を加えて増粘させた後に、発泡剤としての水素化チタンを添加して、水素化チタンの熱分解反応によって生じる水素ガスを利用して溶融アルミニウムを発泡させつつ固化させる発泡溶融法が知られている。しかしながら、同方法によって得られる発泡アルミニウムは、数mmの大きな閉気孔を有するものであった。 As a method for producing such an aluminum porous body, for example, as disclosed in Patent Document 3, after adding a thickener to molten aluminum to increase the viscosity, titanium hydride as a foaming agent is added. Thus, there is known a foaming and melting method in which molten aluminum is foamed and solidified using hydrogen gas generated by a thermal decomposition reaction of titanium hydride. However, the foamed aluminum obtained by this method had large closed pores of several mm.
その他、第2の方法として、スポンジウレタンを中子にした鋳型にアルミニウムを圧入し、ウレタンが焼失して形成される空洞にアルミニウムを充填することにより、スポンジ骨格の発泡アルミニウムを得る方法がある。同方法によれば、40PPI以下の孔径、すなわち、1インチ当たり40セル以下の孔径(孔径約600μm以上)の開気孔を有する発泡アルミニウムが得られる。 In addition, as a second method, there is a method of obtaining foamed aluminum having a sponge skeleton by press-fitting aluminum into a mold having sponge urethane as a core and filling aluminum into a cavity formed by burning out urethane. According to this method, a foamed aluminum having a pore size of 40 PPI or less, that is, a pore size of 40 cells or less per inch (a pore size of about 600 μm or more) is obtained.
さらに、第3の方法として、特許文献4に開示されるように、中空セラミックスからなる強化材にアルミニウム合金を加圧浸透させて、強化材の寸法に応じた500μm以下の孔径の閉気孔を有する発泡アルミニウムを得る方法もある。 Furthermore, as disclosed in Patent Document 4, as a third method, aluminum alloy is pressed and infiltrated into a reinforcing material made of hollow ceramics to have closed pores having a pore diameter of 500 μm or less according to the size of the reinforcing material. There is also a method for obtaining foamed aluminum.
また、第4の方法として、特許文献5に開示されるように、AlSi合金粉末とTiH2粉末との混合粉末をアルミニウム板材に挟んで加熱圧延することによって、TiH2粉末の分解によりアルミニウムを発泡させる方法があるものの、同方法によって得られる発泡アルミニウムは、数mm単位の大きな孔径を有するものである。 Further, as disclosed in Patent Document 5, as a fourth method, aluminum is foamed by decomposition of TiH 2 powder by heating and rolling a mixed powder of AlSi alloy powder and TiH 2 powder between aluminum plates. However, the foamed aluminum obtained by this method has a large pore diameter of several mm.
さらには、第5の方法として、特許文献6に開示されるように、アルミニウムとの共晶温度がアルミニウムの融点よりも低い金属をアルミニウムに混合し、共晶温度よりも高くアルミニウムの融点よりも低い温度に加熱焼成する方法があるものの、同方法によって得られる発泡アルミニウムは、孔径を小さくすることができても気孔率が40%前後と小さい。このため、集電体としての発泡アルミニウムの気孔に浸透する正極活物質や負極活物質の量が少なく、所望の高出力化、高エネルギー密度化が図れなかった。 Furthermore, as disclosed in Patent Document 6, as a fifth method, a metal whose eutectic temperature with aluminum is lower than the melting point of aluminum is mixed with aluminum, and is higher than the eutectic temperature and higher than the melting point of aluminum. Although there is a method of heating and firing at a low temperature, the foamed aluminum obtained by this method has a porosity as small as about 40% even if the pore diameter can be reduced. For this reason, the amount of the positive electrode active material and the negative electrode active material penetrating into the pores of the foamed aluminum as the current collector is small, and the desired high output and high energy density cannot be achieved.
本発明は、かかる事情に鑑みてなされたもので、高出力化、高エネルギー密度化が要求される電池やキャパシタの正極集電体に適したアルミニウム多孔質焼結体を提供することを課題とする。 The present invention has been made in view of such circumstances, and it is an object to provide an aluminum porous sintered body suitable for a positive electrode current collector of a battery or a capacitor that requires high output and high energy density. To do.
上記課題を解決するために、請求項1に記載の発明は、有孔金属焼結体からなる三次元網目構造の金属骨格を有し、上記骨格間に空孔を有してなるアルミニウム多孔質焼結体であって、上記有孔金属焼結体にAl−Ti化合物が分散しているとともに、上記空孔が直線長さ1cm当たりに20ヶ以上形成されることにより、全体気孔率が70〜99%であることを特徴としている。 In order to solve the above problems, the invention according to claim 1 is a porous aluminum body having a metal skeleton having a three-dimensional network structure made of a porous metal sintered body, and having pores between the skeletons. The sintered body, in which the Al—Ti compound is dispersed in the perforated metal sintered body, and 20 or more holes are formed per 1 cm of the linear length, the total porosity is 70. It is characterized by -99%.
請求項1に記載のアルミニウム多孔質焼結体によれば、正極集電体として円柱状の電池要素の外周に巻き付けた場合にも正極活物質の剥離がないだけでなく、充放電に伴う活物質の膨張収縮による正極活物質の脱落が生じにくく、安定的に使用できる。 According to the porous aluminum sintered body of claim 1, not only does the positive electrode active material not peel off when wound around the outer periphery of a cylindrical battery element as the positive electrode current collector, The positive electrode active material does not easily fall off due to the expansion and contraction of the material, and can be used stably.
以下、本発明に係るアルミニウム多孔質焼結体の一実施形態について説明する。
まず、本発明のアルミニウム多孔質焼結体を得るための製造方法は、アルミニウム粉末にチタンおよび/または水素化チタンを混合してアルミニウム混合原料粉末とするアルミニウム混合原料粉末調製工程と、このアルミニウム混合原料粉末に水溶性樹脂結合剤と水と可塑剤とを混合して粘性組成物を調製する粘性組成物調製工程と、この粘性組成物に気泡を混合させた状態で乾燥させて焼結前成形体を得る焼結前工程と、焼結前成形体を非酸化性雰囲気にてTm−10(℃)≦加熱焼成温度T≦685(℃)で加熱焼成する焼結工程とを有する。なお、Tm(℃)は、アルミニウム混合原料粉末が溶解を開始する温度である。
Hereinafter, an embodiment of an aluminum porous sintered body according to the present invention will be described.
First, a manufacturing method for obtaining an aluminum porous sintered body of the present invention includes an aluminum mixed raw material powder preparation step in which aluminum and titanium hydride are mixed with aluminum powder to obtain an aluminum mixed raw material powder, and this aluminum mixing A viscous composition preparation process in which a raw material powder is mixed with a water-soluble resin binder, water, and a plasticizer to prepare a viscous composition, and then pre-sintered by drying in a state where bubbles are mixed in the viscous composition A pre-sintering step for obtaining a body, and a sintering step for heating and firing the pre-sintered compact in a non-oxidizing atmosphere at Tm-10 (° C.) ≦ heating and firing temperature T ≦ 685 (° C.). Tm (° C.) is a temperature at which the aluminum mixed raw material powder starts to melt.
このアルミニウム混合原料粉末調製工程では、アルミニウム粉末として平均粒子径2〜200μmのものが用いられる。これは、平均粒子径が小さくなると、アルミニウム粉末に対して水溶性樹脂結合剤を多量に加えて、粘性組成物が所望の形状に成形可能な程度に粘性を有するように、かつ焼結前成形体がハンドリング強度を有するようにする必要がある。しかしながら、水溶性樹脂結合剤を多量に加えると、焼結前成形体を加熱焼成する際にアルミニウム中に残存する炭素量が増加して、焼結反応が阻害されてしまう。他方、アルミニウム粉末の粒子径が大きすぎると、発泡アルミニウムの強度が低下してしまう。そこで、アルミニウム粉末としては、上述のように平均粒子径2〜200μmの範囲内、より好ましくは7μm〜40μmの範囲内のものが用いられる。 In this aluminum mixed raw material powder preparation step, aluminum powder having an average particle size of 2 to 200 μm is used. This is because when the average particle size becomes small, a large amount of a water-soluble resin binder is added to the aluminum powder so that the viscous composition is viscous enough to be molded into a desired shape, and before sintering. It is necessary for the body to have handling strength. However, when a large amount of the water-soluble resin binder is added, the amount of carbon remaining in the aluminum is increased when the pre-sintered molded body is heated and fired, thereby inhibiting the sintering reaction. On the other hand, when the particle diameter of the aluminum powder is too large, the strength of the foamed aluminum is lowered. Therefore, as the aluminum powder, those having an average particle diameter in the range of 2 to 200 μm, more preferably in the range of 7 to 40 μm are used as described above.
さらに、このアルミニウム粉末にチタンおよび/または水素化チタンを混合する。これは、アルミニウム粉末にチタンを混合して、焼結前成形体をTm−10(℃)≦加熱焼成温度T≦685(℃)にて加熱焼成することによって、液滴の塊を生成させることのないアルミニウムのフリーシンタリングが可能となるためである。また、水素化チタン(TiH2)は、そのチタン含有量が47.88(チタンの分子量)/(47.88+1(水素の分子量)×2)で95質量%以上である上に、470〜530℃にて脱水素してチタンとなるため上述の加熱焼成により熱分解してチタンとなる。従って、水素化チタンを混合した場合にも液滴の塊を生成させることのないアルミニウムのフリーシンタリングが可能となる。 Further, titanium and / or titanium hydride are mixed with the aluminum powder. In this method, titanium is mixed with aluminum powder, and the pre-sintered compact is heated and fired at Tm-10 (° C.) ≦ heating and firing temperature T ≦ 685 (° C.), thereby generating droplets. This is because free sintering of aluminum without any metal becomes possible. Further, titanium hydride (TiH 2 ) has a titanium content of 47.88 (molecular weight of titanium) / (47.88 + 1 (molecular weight of hydrogen) × 2) of 95% by mass or more, and 470 to 530. Since it is dehydrogenated at titanium and becomes titanium, it is thermally decomposed by the above-mentioned heating and baking to become titanium. Accordingly, free sintering of aluminum is possible without generating droplet lumps even when titanium hydride is mixed.
その際、チタンあるいは水素化チタンの平均粒子径をr(μm)、チタンあるいは水素化チタンの配合比をW質量%としたときにの配合比をW質量%としたときに、1(μm)≦r≦30(μm)、0.1(質量%)≦W≦20(質量%)であり、かつ0.1≦W/r≦2とする。すなわち、平均粒子径4μmの水素化チタン粉の場合に、配合比Wは、0.1≦W/4≦2であることから0.4〜8質量%となり、平均粒子径20μmのチタン粉の場合に、配合比Wは、0.1≦W/20≦2であることから2〜40質量%となるが、0.1(質量%)≦W≦20(質量%)から2〜20質量%となる。 At that time, when the average particle diameter of titanium or titanium hydride is r (μm), the mixing ratio when the mixing ratio of titanium or titanium hydride is W mass% is 1 (μm). ≦ r ≦ 30 (μm), 0.1 (mass%) ≦ W ≦ 20 (mass%), and 0.1 ≦ W / r ≦ 2. That is, in the case of titanium hydride powder having an average particle diameter of 4 μm, the compounding ratio W is 0.4 ≦ 8% by mass because 0.1 ≦ W / 4 ≦ 2, and the titanium powder having an average particle diameter of 20 μm In this case, the compounding ratio W is 2 to 40% by mass because 0.1 ≦ W / 20 ≦ 2, but 2 to 20% by mass from 0.1 (% by mass) ≦ W ≦ 20 (% by mass). %.
また、水素化チタンの平均粒子径は0.1(μm)≦r≦30(μm)としたが、より好ましくは4(μm)≦r≦20(μm)とする。このようにしたのは、1μm以下であると、自然発火する恐れがあり、一方、30μmを超えると、前記水素化チタンは焼結後にアルミニウムとチタンとの化合物が被覆したチタン粒子になるが、そのアルミニウムとチタンの化合物相がチタン粒子から剥離しやすくなって、焼結体に所望の強さが得られなるためである。 The average particle diameter of titanium hydride is 0.1 (μm) ≦ r ≦ 30 (μm), more preferably 4 (μm) ≦ r ≦ 20 (μm). If it is 1 μm or less, there is a risk of spontaneous ignition. On the other hand, if it exceeds 30 μm, the titanium hydride becomes titanium particles coated with a compound of aluminum and titanium after sintering. This is because the compound phase of aluminum and titanium is easily peeled off from the titanium particles, and desired strength is obtained in the sintered body.
さらに、0.1(質量%)≦W≦20(質量%)としたのは、焼結助剤粉末の配合比Wが20質量%を超えるとアルミニウム混合原料粉末中で焼結助剤粉末同士が接点を持つようになって、アルミニウムとチタンの反応熱を制御できなくなるとともに所望の多孔質焼結体が得られないようになるためである。 Further, 0.1 (mass%) ≦ W ≦ 20 (mass%) is set when the sintering aid powder is mixed in the aluminum mixed raw material powder when the blending ratio W of the sintering assistant powder exceeds 20 mass%. This makes it possible to have a contact, so that the reaction heat between aluminum and titanium cannot be controlled, and a desired porous sintered body cannot be obtained.
また、0.1(質量%)≦W≦20(質量%)の範囲内であっても、焼結助剤粉末の粒子径によってはアルミニウムとチタンの反応熱が大きくなりすぎる場合があり、反応熱によって溶解したアルミニウムの温度がさらに上昇して粘性が下がり、液滴を生じてしまう場合があった。 Further, even within the range of 0.1 (mass%) ≦ W ≦ 20 (mass%), the reaction heat of aluminum and titanium may become too large depending on the particle size of the sintering aid powder, In some cases, the temperature of the aluminum melted by heat is further increased, the viscosity is lowered, and droplets are generated.
そこで、種々の条件で作製した試験片を電子顕微鏡で観察した結果から、発熱量をチタンの配合量および粒子径で制御できる範囲内では、チタン粒子の露出表面側からほぼ一定の厚さの表層部だけがアルミニウム反応していることがわかった。これにより、液滴の発生を防止するためには1(μm)≦r≦30(μm)、かつ0.1≦W/r≦2であることが望ましいことを実験的に導出した。 Therefore, from the results of observing specimens prepared under various conditions with an electron microscope, the surface layer with a substantially constant thickness from the exposed surface side of the titanium particles within a range in which the calorific value can be controlled by the blending amount and particle size of titanium. It was found that only the part reacted with aluminum. Thus, it was experimentally derived that it is desirable that 1 (μm) ≦ r ≦ 30 (μm) and 0.1 ≦ W / r ≦ 2 in order to prevent the generation of droplets.
なお、0.1≦W/r≦2の意味について、焼結助剤粉末にチタンを利用する場合を説明すると、チタンの平均粒子径をr、チタンの粒子数をN、チタンの添加質量をw、チタンの比重をD、アルミニウムとの反応によるチタン粒径の減少量をdとすると、反応熱量Qは反応したチタンの体積に比例することから、Q∝4πr2dNである。さらに、チタン粒子の添加量は、チタン粒子1個の平均体積とチタン粒子の数との積により算出されることから、w=4/3πr3DNである。よって後者の式を前者の式に代入すると、Q∝3wd/rDとなる。ここで、3/Dが定数であること、ならびにdが焼結条件によらずほぼ一定であるという観察結果からQ∝w/rである。従って、液滴が発生しないW/rの範囲を実験的に求めて上述のように限定することによって、アルミニウムとチタンの反応熱が大きすぎることによる液滴の発生を防止するものである。 Regarding the meaning of 0.1 ≦ W / r ≦ 2, the case where titanium is used for the sintering aid powder will be described. The average particle diameter of titanium is r, the number of titanium particles is N, and the added mass of titanium is Assuming that w, the specific gravity of titanium is D, and the amount of decrease in the titanium particle size due to the reaction with aluminum is d, the amount of reaction heat Q is proportional to the volume of the reacted titanium, so that Q∝4πr 2 dN. Furthermore, since the addition amount of the titanium particles is calculated by the product of the average volume of one titanium particle and the number of titanium particles, w = 4 / 3πr 3 DN. Therefore, when the latter equation is substituted into the former equation, Q∝3wd / rD is obtained. Here, Q∝w / r from the observation result that 3 / D is a constant and d is substantially constant regardless of the sintering conditions. Therefore, by experimentally determining the range of W / r in which no droplets are generated and limiting it as described above, the generation of droplets due to excessive reaction heat between aluminum and titanium is prevented.
次いで、粘性組成物調製工程は、上記アルミニウム混合原料粉末に、水溶性樹脂結合剤として、ポリビニルアルコール、メチルセルロースおよびエチルセルロースの少なくともいずれか一種以上を、可塑剤として、ポリエチレングリコール、グリセリンおよびフタル酸ジNブチルの少なくともいずれか一種以上をそれぞれ加えるとともに、蒸留水と、界面活性剤としてのアルキルベタインとをそれぞれ加える。 Next, in the viscous composition preparation step, at least one of polyvinyl alcohol, methylcellulose and ethylcellulose is used as the water-soluble resin binder, and polyethylene glycol, glycerin and di-N-phthalate are used as the plasticizer. While adding at least one of butyl, distilled water and alkylbetaine as a surfactant are added.
このように、水溶性樹脂結合剤として、ポリビニルアルコール、メチルセルロースやエチルセルロースを用いることにより、その添加量が比較的少量で足りる。このため、その添加量をアルミニウム混合原料粉末の質量の0.5%〜7%の範囲内とする。これは、アルミニウム混合原料粉末の質量の7%を超えて含まれると、加熱焼成する際に焼結前成形体などに残留する炭素量が増加して焼結反応が阻害され、0.5%未満であると、焼結前成形体のハンドリング強度が確保されないためである。 Thus, by using polyvinyl alcohol, methyl cellulose, or ethyl cellulose as the water-soluble resin binder, a relatively small amount is sufficient. For this reason, the addition amount is set within the range of 0.5% to 7% of the mass of the aluminum mixed raw material powder. If the content of the aluminum mixed raw material powder exceeds 7%, the amount of carbon remaining in the pre-sintered molded body during heating and firing is increased, and the sintering reaction is inhibited. It is because the handling intensity | strength of the molded object before sintering is not ensured that it is less than.
また、アルキルベタインは、アルミニウム混合原料粉末の質量の0.02%〜3%が添加される。これは、アルミニウム混合原料粉末の質量の0.02%以上とすることによって、後述の非水溶性炭化水素系有機溶剤の混合の際に気泡が効果的に生成され、3%以下とすることによって、焼結前成形体などに残存する炭素量が増加することによる焼結反応の阻害が防止される。 In addition, 0.02% to 3% of the mass of the aluminum mixed raw material powder is added to the alkylbetaine. This is because by making 0.02% or more of the mass of the aluminum mixed raw material powder, bubbles are effectively generated when mixing the water-insoluble hydrocarbon organic solvent described later, and by making it 3% or less. Inhibition of the sintering reaction due to an increase in the amount of carbon remaining in the pre-sintered compact or the like is prevented.
そして、これらを混練した後に、さらに炭素数5〜8非水溶性炭化水素系有機溶剤を混合することにより発泡させて、気泡の混合した粘性組成物を調整する。この炭素数5〜8非水溶性炭化水素系有機溶剤としては、ペンタン、ヘキサン、ヘプタンおよびオクタンの少なくとも一種以上が使用可能である。 And after kneading these, it is made to foam by mixing a C5-C8 water-insoluble hydrocarbon-type organic solvent, and the viscous composition with which the bubble was mixed is adjusted. As this water-insoluble hydrocarbon organic solvent having 5 to 8 carbon atoms, at least one of pentane, hexane, heptane and octane can be used.
次いで、焼結前工程では、帯状のポリエチレンシートの剥離剤塗布面に、粘性組成物を厚さ0.05mm〜5mmの厚さに引き延ばして塗布し、周囲の温度および湿度を一定時間管理して、気泡を整寸化した後、大気乾燥機にて温度70度で乾燥させる。その際、粘性組成物は、ドクターブレード法、スラリー押出し法あるいはスクリーン印刷法などによって塗布する。 Next, in the pre-sintering process, the viscous composition is stretched to a thickness of 0.05 mm to 5 mm on the surface of the strip-shaped polyethylene sheet, and the ambient temperature and humidity are controlled for a certain period of time. After air bubbles are sized, they are dried at a temperature of 70 degrees with an air dryer. At that time, the viscous composition is applied by a doctor blade method, a slurry extrusion method, a screen printing method, or the like.
そして、乾燥後の粘性組成物を、ポリエチレンシートから剥がして、必要に応じて直径100mmの円形などの所定形状に切り出して焼結前成形体が得られる。 And the viscous composition after drying is peeled off from a polyethylene sheet, and if necessary, it cuts out into predetermined shapes, such as a circle with a diameter of 100 mm, and the molded object before sintering is obtained.
次いで、焼結工程では、上記焼結前成形体を、ジルコニア敷粉を敷いたアルミナセッターの上に載置して、露点が−20℃以下のアルゴン雰囲気中に520℃で1時間加熱保持する仮焼成を行う。これにより、焼結前成形体の水溶性樹脂結合剤成分、可塑剤成分、蒸留水およびアルキルベタインのバインダー溶液を飛ばす脱バインダーがなされるとともに、焼結助剤粉末として水素化チタンを用いた場合には脱水素がなされる。 Next, in the sintering step, the above-mentioned pre-sintered compact is placed on an alumina setter on which zirconia powder is spread, and heated and held at 520 ° C. for 1 hour in an argon atmosphere with a dew point of −20 ° C. or lower. Pre-baking is performed. This removes the binder solution of the water-soluble resin binder component, plasticizer component, distilled water and alkylbetaine of the pre-sintered molded body, and when titanium hydride is used as the sintering aid powder. Is dehydrogenated.
その後、仮焼成後の焼結前成形体を、Tm−10(℃)≦加熱焼成温度T≦685(℃)で加熱焼成して発泡アルミニウムを得る。
これは、焼結前成形体を融解温度Tm(℃)まで加熱することにより、アルミニウムとチタンとの反応が開始するものと考えられるものの、実際にはアルミニウムに不純物としてFeやSiなどの共晶合金元素を微量に含有して融点が低下することから、Tm−10(℃)まで加熱することによりアルミニウムとチタンとの反応が開始して発泡アルミニウムを形成するものと考えられるためである。実際に、アルミニウムの融点が660℃であるのに対して、純アルミニウム粉として流通している純度98%〜99.7%程度のアトマイズ粉では650℃前後が溶解開始温度となる。
Thereafter, the pre-sintered molded body after the preliminary firing is heated and fired at Tm-10 (° C.) ≦ heating and firing temperature T ≦ 685 (° C.) to obtain foamed aluminum.
Although it is considered that the reaction between aluminum and titanium starts by heating the pre-sintered compact to the melting temperature Tm (° C.), it is actually a eutectic such as Fe or Si as an impurity in aluminum. This is because the alloy element is contained in a very small amount and the melting point is lowered, so that it is considered that the reaction between aluminum and titanium starts by heating to Tm-10 (° C.) to form foamed aluminum. Actually, while the melting point of aluminum is 660 ° C., the melting start temperature is around 650 ° C. for atomized powder having a purity of about 98% to 99.7% distributed as pure aluminum powder.
他方、アルミニウムとチタンの包晶温度である665℃になり、さらに融解潜熱が入熱されるとアルミニウムの焼結体が融解することから、炉内雰囲気温度を685℃以下に保つ必要がある。 On the other hand, the peritectic temperature of aluminum and titanium is 665 ° C., and further, when the latent heat of fusion is input, the sintered body of aluminum melts, so it is necessary to keep the furnace atmosphere temperature at 685 ° C. or lower.
なお、焼結工程における加熱焼成は、アルミニウム粒子表面およびチタン粒子表面の酸化被膜の成長を抑制するため、非酸化性雰囲気にて行う必要がある。但し、加熱温度が400℃以下に30分間程度保持の条件であれば空気中で加熱してもアルミニウム粒子表面およびチタン粒子表面の酸化被膜はさほど成長しないので、例えば、焼結前成形体を、一旦空気中で300℃〜400℃に10分間程度加熱保持して脱バインダーした後、アルゴン雰囲気中で所定の温度に加熱して焼成してもよい。 In addition, in order to suppress the growth of the oxide film of the aluminum particle surface and the titanium particle surface, it is necessary to perform the heat baking in the sintering process in a non-oxidizing atmosphere. However, if the heating temperature is kept at 400 ° C. or lower for about 30 minutes, the oxide film on the aluminum particle surface and the titanium particle surface does not grow so much even if heated in air. After debinding by heating and holding at 300 ° C. to 400 ° C. for about 10 minutes in air, it may be fired at a predetermined temperature in an argon atmosphere.
これにより得られた発泡アルミニウムは、有孔金属焼結体からなる三次元網目構造の金属骨格を有し、金属骨格間に空孔を有している。また、有孔金属焼結体にAl−Ti化合物が分散しており、空孔が直線長さ1cm当たりに20ヶ以上形成されて、70〜90%の全体気孔率を有し、リチウムイオン二次電池や電気二重層型キャパシタの集電体として好適に用いられる。 The foamed aluminum thus obtained has a metal skeleton having a three-dimensional network structure made of a porous metal sintered body, and has pores between the metal skeletons. Further, the Al—Ti compound is dispersed in the perforated metal sintered body, 20 or more pores are formed per 1 cm of the linear length, and the total porosity is 70 to 90%. It is suitably used as a current collector for secondary batteries and electric double layer type capacitors.
なお、本発明は、上述の実施形態に何ら限定されるものでなく、例えば、チタンや水素化チタン以外の焼結助剤粉末を用いてもよく、焼結助剤元素としてチタンを含む焼結助剤粉末を用いればよい。 The present invention is not limited to the above-described embodiment. For example, a sintering aid powder other than titanium or titanium hydride may be used, and sintering including titanium as a sintering aid element. An auxiliary powder may be used.
本実施形態の発泡アルミニウムの製造方法によれば、アルミニウム混合原料粉末調製工程にてアルミニウム粉末に焼結助剤粉末としてチタンおよび/または水素化チタンを混合したアルミニウム混合原料粉末を、粘性組成物調製工程にて発泡させ、焼結工程にてTm−10(℃)≦T≦685(℃)にて加熱焼成することによってスポンジ骨格で囲まれる孔径600μm未満の整寸な気孔と、スポンジ骨格自体に形成される直線長さ100μmあたり2ヶ以上の微小気孔の2種類の形態の異なる気孔を有する高気孔率で均質な発泡アルミニウムを得ることができる。その際、水素化チタンは、そのチタン含有量が95質量%以上である上に、470〜530℃にて脱水素してチタンとなるため、上述の加熱焼成により熱分解してチタンとなる。従って、水素化チタンは、チタンと同様に、上述の加熱焼成によって発泡アルミニウムの製造に寄与するものと考えられる。 According to the method for producing foamed aluminum of this embodiment, an aluminum mixed raw material powder in which titanium and / or titanium hydride is mixed with aluminum powder as a sintering aid powder in the aluminum mixed raw material powder preparation step is prepared as a viscous composition. By foaming in the process and heating and firing at Tm-10 (° C.) ≦ T ≦ 685 (° C.) in the sintering process, the pores with a pore diameter of less than 600 μm surrounded by the sponge skeleton and the sponge skeleton itself A high-porosity and homogeneous foamed aluminum having pores with two different forms of two or more micropores per 100 μm of linear length to be formed can be obtained. At that time, the titanium hydride has a titanium content of 95% by mass or more and is dehydrogenated at 470 to 530 ° C. to be titanium, so that it is thermally decomposed by the above-mentioned heating and baking to become titanium. Therefore, it is considered that titanium hydride contributes to the production of foamed aluminum by the above-described heating and firing, as is the case with titanium.
さらに、粘性組成物調製工程と焼結工程との間に、帯状のポリエチレンシートの剥離剤塗布面に、粘性組成物を厚さ0.05mm〜5mmの厚さに引き延ばして塗布するなどして所定形状の焼結前成形体とする焼結前工程を有することによって、後工程の焼結工程を得ることにより、リチウムイオン二次電池や電気二重層型キャパシタの集電体などの用途に応じた発泡アルミニウムを得ることができる。 Further, between the viscous composition preparation step and the sintering step, the viscous composition is stretched and applied to a thickness of 0.05 mm to 5 mm on the stripping surface of the strip-shaped polyethylene sheet. By having a pre-sintering process to form a pre-sintered shaped body, and obtaining a post-sintering process, depending on the application such as a current collector of a lithium ion secondary battery or an electric double layer capacitor Foamed aluminum can be obtained.
(実施例1〜16)
次に、平均粒子径2.1μm、9.4μm、24μm、87μmおよび175μmのAl粉と、平均粒子径9.8μm、24μmおよび42μmのTi粉と、平均粒子径4.2μm、9.1μmおよび21μmのTiH2粉とを用意する。そして、上述の実施の形態に従って、表1に示す割合でAl粉にTi粉および/またはTiH2粉を混合したアルミニウム混合原料粉末1〜10を調製し、表2に示す配合組成でバインダー溶液1〜5を調製し、それらと非水溶性炭化水素系有機溶剤を表3に示す割合で混練して実施例1〜16の粘性組成物を製造した。
(Examples 1 to 16)
Next, an Al powder having an average particle size of 2.1 μm, 9.4 μm, 24 μm, 87 μm and 175 μm, a Ti powder having an average particle size of 9.8 μm, 24 μm and 42 μm, an average particle size of 4.2 μm, 9.1 μm and A 21 μm TiH 2 powder is prepared. Then, according to the above embodiment, the raw aluminum mixed powder 10 obtained by mixing Ti powder and / or TiH 2 powder to Al powder at a ratio shown in Table 1 were prepared, a binder solution 1 the formulation composition shown in Table 2 To 5 were prepared, and these and the water-insoluble hydrocarbon-based organic solvent were kneaded in the proportions shown in Table 3 to produce viscous compositions of Examples 1 to 16.
次いで、これらの実施例1〜16の粘性組成物を、ドクターブレード法にて剥離剤が塗布されたポリエチレンシートに引き伸ばして塗布し、温度および湿度を一定時間保持するよう管理して、気泡を整寸化した後、大気乾燥機にて温度70℃で乾燥させる。その際の粘性組成物の塗布厚さ並びに上記温度、湿度及び保持時間を表3に示す。そして、乾燥後の粘性組成物を、ポリエチレンシートから剥がして、直径100mmの円形に切り出して実施例1〜16の焼結前成形体を得る。 Next, the viscous compositions of Examples 1 to 16 were stretched and applied to a polyethylene sheet coated with a release agent by the doctor blade method, and the temperature and humidity were controlled to be maintained for a certain period of time to regulate bubbles. After sizing, it is dried at a temperature of 70 ° C. in an air dryer. Table 3 shows the application thickness of the viscous composition and the temperature, humidity and holding time. And the viscous composition after drying is peeled off from a polyethylene sheet, it cuts out into a circle with a diameter of 100 mm, and the molded object before sintering of Examples 1-16 is obtained.
そして、これらの実施例1〜16の焼結前成形体を、ジルコニア敷粉を敷いたアルミナセッターの上に載置して、アルゴン気流雰囲気中または大気中で脱バインダーを行った後に、加熱焼成して、発泡アルミニウムを得る。その際の加熱焼成温度と加熱焼成保持時間についても表3に示す。 Then, the pre-sintered compacts of Examples 1 to 16 were placed on an alumina setter on which zirconia powder was spread, and after debinding in an argon airflow atmosphere or in the air, heating and firing were performed. Thus, foamed aluminum is obtained. Table 3 also shows the heating and baking temperature and the heating and holding time at that time.
次に、これにより得られた実施例1〜16の発泡アルミニウムの収縮率と気孔率とを算出した。また、実体顕微鏡写真から3次元空孔数および走査型電子顕微鏡(SEM)写真から骨格の孔数をそれぞれ計測するとともに、同SEM写真にて液滴凝固の有無を確認し、さらには、電子線マイクロアナライザー(EPMA)による面分析によって発泡アルミニウムの骨格表面にAl−Ti化合物の有無を確認した。それらの結果を表5に示すとともに、実施例1の発泡アルミニウムのSEM写真を図1に、その一部拡大写真を図2にそれぞれ示した。 Next, the shrinkage | contraction rate and porosity of the foamed aluminum of Examples 1-16 obtained by this were computed. In addition, the number of three-dimensional vacancies and the number of skeletal holes from a scanning electron microscope (SEM) photograph are measured from a stereomicrograph, and the presence or absence of droplet solidification is confirmed by the SEM photograph. The presence or absence of an Al-Ti compound was confirmed on the surface of the skeleton of the foamed aluminum by surface analysis using a microanalyzer (EPMA). The results are shown in Table 5, and a SEM photograph of the foamed aluminum of Example 1 is shown in FIG. 1, and a partially enlarged photograph thereof is shown in FIG.
次に、実施例1〜16の発泡アルミニウムについて、それぞれ圧下率20%にてロール圧延テストを行って割れの有無を黙視にて確認した後に、20mm×50mmの矩形状に切り出して対向角部間の電気抵抗を測定した。次いで、これらの矩形状の発泡アルミニウムをそれぞれ直径5mmの円柱体の外周に巻きつけて、割れの有無を目視にて確認した。それらの結果を表5に示した。 Next, each of the foamed aluminums of Examples 1 to 16 was subjected to a roll rolling test at a rolling reduction of 20%, and after confirming the presence or absence of cracks, was cut out into a rectangular shape of 20 mm × 50 mm and between the opposing corners. The electrical resistance of was measured. Next, these rectangular aluminum foams were respectively wound around the outer periphery of a cylindrical body having a diameter of 5 mm, and the presence or absence of cracks was visually confirmed. The results are shown in Table 5.
(比較例1〜9)
次いで、実施例と同一のAl粉、Ti粉およびTiH2粉を用意して調製した比較アルミニウム混合原料粉末1〜5を上記アルミニウム混合原料粉末1〜9とともに用いて、表2に示すバインダー溶液1〜5によって非水溶性炭化水素系有機溶剤を表4に示す割合で混練した他は、実施例と同様にして比較例1〜9の発泡アルミニウムを製造した。そして、比較例1〜9の発泡アルミニウムを実施例と同様の方法にて評価して表5に示すとともに、比較例1の発泡アルミニウムのSEM写真を図3した。
(Comparative Examples 1-9)
Next, the comparative aluminum mixed raw material powders 1 to 5 prepared by preparing the same Al powder, Ti powder and TiH 2 powder as in the examples were used together with the aluminum mixed raw material powders 1 to 9, and the binder solution 1 shown in Table 2 The foamed aluminum of Comparative Examples 1 to 9 was produced in the same manner as in the Examples except that the water-insoluble hydrocarbon-based organic solvent was kneaded at a ratio shown in Table 4 according to -5. And while evaluating the foamed aluminum of Comparative Examples 1-9 by the method similar to an Example and showing in Table 5, the SEM photograph of the foamed aluminum of Comparative Example 1 was shown in FIG.
表5から判るように、実施例1〜16の発泡アルミニウムは、有孔金属焼結体の骨格長さ100μm当たりの孔数2〜4であるとともに、金属骨格間にある3次元空孔を1インチ当たり52ヶ以上有し、すなわち、1cm当たりに20ヶ以上有している。そして、発泡アルミニウムに液滴状の塊が生じることもなく、電機抵抗も低く、巻き付け試験による割れもなかった。従って、高出力化、高エネルギー密度化が要求される電池やキャパシタの正極集電体に適している。 As can be seen from Table 5, the foamed aluminum of Examples 1 to 16 has 2 to 4 holes per 100 μm of the skeleton length of the porous metal sintered body, and 1 three-dimensional void between the metal skeletons. There are 52 or more per inch, that is, 20 or more per 1 cm. Further, no droplet-like lump was formed in the foamed aluminum, the electric resistance was low, and there was no cracking due to the winding test. Therefore, it is suitable for a positive current collector of a battery or a capacitor that requires high output and high energy density.
次に、活物質としてコバルト酸リチウム(LiCoO2)粉末と、結着剤としてポリフッ化ビニリデン(PVdE)と、導電材として人造黒鉛粉とを重量比で86:6:8に混合して正極剤を調製し、この正極剤に溶剤としてN−メチル−2ピロリドンを混合して正極活物質スラリーを調製した。 Next, a lithium cobaltate (LiCoO 2 ) powder as an active material, polyvinylidene fluoride (PVdE) as a binder, and artificial graphite powder as a conductive material are mixed in a weight ratio of 86: 6: 8 to obtain a positive electrode agent. A positive electrode active material slurry was prepared by mixing N-methyl-2pyrrolidone as a solvent with this positive electrode agent.
次いで、この正極活物質スラリーに、実施例1〜16の発泡アルミニウムおよび従来例1の発泡アルミニウムを10分間浸漬し、取り出して乾燥させた後に、圧延して厚さ0.5mmの実施例1〜16のリチウムイオン電池の正極を作製した。 Next, in this positive electrode active material slurry, the foamed aluminum of Examples 1 to 16 and the foamed aluminum of Conventional Example 1 were immersed for 10 minutes, taken out and dried, then rolled and rolled into Examples 1 to 5 having a thickness of 0.5 mm. Sixteen lithium ion battery positive electrodes were prepared.
なお、従来例1の発泡アルミニウムとしては、従来技術の第2の方法であるスポンジウレタンを中子にした鋳型にアルミニウムを圧入する方法で製造した30PPIの発泡アルミニウムを用いた。また、これらの実施例1〜16の発泡アルミニウムおよび従来例1の発泡アルミニウムの正極活物質の充填密度は表5に示した。 In addition, as the foamed aluminum of Conventional Example 1, 30 PPI foamed aluminum produced by press-fitting aluminum into a mold having sponge urethane as a core, which is the second method of the prior art, was used. Further, the packing density of the positive electrode active materials of the foamed aluminum of Examples 1 to 16 and the foamed aluminum of Conventional Example 1 is shown in Table 5.
次いで、直径1mm、1.5mm、2mm、2.5mm、3mm、3.5mm、4mm、4.5mm、5mmの円柱体をそれぞれ用意して、実施例1〜16および従来例1のリチウムイオン電池の正極を巻き付けて、活物質が剥離するか否かを目視観察し、剥離が認められなかった最小径を表5に示した。 Next, cylindrical bodies having diameters of 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm were prepared, and the lithium ion batteries of Examples 1 to 16 and Conventional Example 1 were prepared. Each of the positive electrodes was wound, and whether or not the active material was peeled was visually observed. Table 5 shows the minimum diameter where no peeling was observed.
その結果、表5から判るように、実施例1〜16のリチウムイオン電池の正極は、直径1.5mm〜2.5mmの円柱体に巻き付けても活物質が剥離しなかったのに対して、従来例1の正極は、直径3mmの円柱体に巻き付けた段階で活物質が剥離してしまった。さらには、実施例1〜16のリチウムイオン電池の正極は、活物質の充填密度が4.1g/cm3以上であるのに対して、従来例1の正極は、活物質の充填密度が3.84.1g/cm3と小さかった。 As a result, as can be seen from Table 5, the positive electrodes of the lithium ion batteries of Examples 1 to 16 did not peel off the active material even when wound around a cylindrical body having a diameter of 1.5 mm to 2.5 mm. In the positive electrode of Conventional Example 1, the active material was peeled off when it was wound around a cylindrical body having a diameter of 3 mm. Furthermore, the positive electrode of the lithium ion batteries of Examples 1 to 16 has an active material packing density of 4.1 g / cm 3 or more, whereas the positive electrode of Conventional Example 1 has an active material packing density of 3 It was as small as 84.1 g / cm 3 .
発泡アルミニウムとして利用できる他、リチウムイオン二次電池や電気二重層型キャパシタの集電体として利用できる。 Besides being used as foamed aluminum, it can also be used as a current collector for lithium ion secondary batteries and electric double layer capacitors.
Claims (1)
上記有孔金属焼結体にAl−Ti化合物が分散しているとともに、上記空孔が直線長さ1cm当たりに20ヶ以上形成されることにより、全体気孔率が70〜99%であることを特徴とするアルミニウム多孔質焼結体。 A porous aluminum sintered body having a metal skeleton with a three-dimensional network structure made of a porous metal sintered body and having pores between the metal skeletons,
The Al-Ti compound is dispersed in the porous metal sintered body, and 20 or more pores are formed per linear length of 1 cm, so that the overall porosity is 70 to 99%. A porous aluminum sintered body.
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