JP6234594B2 - アモルファスリチウム含有化合物を作製するための蒸着方法 - Google Patents
アモルファスリチウム含有化合物を作製するための蒸着方法 Download PDFInfo
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Description
例示的リチウム含有酸化物化合物としてホウケイ酸リチウム(Li4SiO4・Li3BO3)を考える。本発明のいくつかの実施形態によると、この材料は成分元素リチウム、酸素及び2つのガラス形成元素(ホウ素及びケイ素)から形成される。ホウケイ酸リチウムのいくつかの試料は、上記実施形態によるこれらの成分元素の蒸着を使用することにより一連の基板温度において作製され、それらの構造及び特性を判断するためにラマン分光法を使用することにより特徴付けられた。蒸着は、文献(Guerin, S. and Hayden, B. E., Journal of Combinatorial Chemistry 8, 2006, pages 66-73)に既に説明された物理的蒸着(PVD:physical vapour deposition)システムにおいて行われた。温度を除いて、すべての試料は、原子状酸素の源として酸素プラズマ源を利用して同一条件下で蒸着された。酸化物材料(ケイ酸リチウム及びホウ酸リチウム)はケイ素及びホウ素の両方の最も高い酸化状態(それぞれ4+及び3+)を必要とし、従って、分子状酸素ではなく原子状酸素の使用は、O2を2Oへ分解するために必要な解離工程を除去し、高反応性化学種を供給して、ケイ素及びホウ素を材料Li4SiO4及びLi3BO3において必要なそれらの最も高い酸化状態へ酸化させる。リチウムはクヌーセンセル源から蒸着された。ケイ素及びホウ素は両方とも電子銃(E-Gun)源から蒸着された。
説明したように、ホウケイ酸リチウム薄膜は225℃を含む高温で作製された。加熱が結晶化を引き起こすという理解に基づく予想に反し、これらの薄膜はアモルファスであるということが観測された。
ホウケイ酸リチウムの上記作製は、他のリチウム含有酸化物及び酸窒化化合物の製造へのその柔軟性及び適用可能性を実証するために修正された。混合酸素−窒素フラックスを供給するために酸素プラズマ源への気体送り中に窒素を導入することにより窒素ドープホウケイ酸リチウムが生成された。リチウム、ホウ素及びケイ素は先に説明したように供給され、基板の温度は225℃だった。非ドープホウケイ酸リチウムに対して実証されたものと同様な基板温度の範囲(すなわち、約180℃〜約350℃)がまた窒素ドープ材料へ適用可能であり、約180℃〜約275℃のより狭い範囲により、簡単なやり方で(例えばリチウム喪失に合わせて調整する必要無しに)高品質材料を生成する可能性が高い。
非ドープ及びドープホウケイ酸リチウムのアモルファス性質及び付随高イオン伝導性は、これらの薄膜が薄膜電池中の電解質としての使用に好適であるということを示す。様々な薄膜電池が、上述の蒸着プロセスを使用することにより生成され、完全な機能を示すように特徴付けられた。
上述のように、本発明によると、基板は、約180℃を越えるまで(場合により180℃〜350℃の範囲まで)加熱される。実際に選択される実際の温度は、様々な要因に依存することになる。本発明下で利用可能なかなり広範囲の動作温度は、基板温度を製作工程中の他の処理工程に必要な温度に合わせることを容易にするので魅力的である。例えば、調整を最小限にするために、陰極蒸着などのプロセス内の他の工程に必要な温度と同じ又はそれと同等な温度が選択され得る。結晶陰極又は他の層を含む装置については、範囲の上限方向の温度が好適かもしれない。一方、エネルギー使用及び従って製造コストを低減することに関心があれば、範囲の下限の基板温度が魅力的かもしれない。従って、本発明を実施するための動作パラメータを選択する際に利用可能な自由度があり、温度は、他の必要要件に最適となるように選択され得る。範囲の下限からの温度、例えば180℃から250℃又は275℃、又は範囲の中央の温度、例えば200℃から300℃、又は範囲の上限からの温度、例えば250℃から350℃が、状況によって選択され得る。
これまで、アモルファスホウケイ酸リチウム及び窒素ドープホウケイ酸リチウムの作製が説明された。しかしながら、本発明はこれらの材料に限定されなく、加熱された基板上への直接の成分元素の蒸着の過程は、他のリチウム含有酸化物及び酸窒化化合物の製造へ適用可能である。材料の別の例としては、ケイ酸リチウム及びホウ酸リチウムが挙げられ、ホウ素、ケイ素、ゲルマニウム、アルミニウム、ヒ素、及びアンチモンを含むガラス形成元素を含む他の化合物が挙げられる。アモルファス酸化物及び酸窒化物は本発明による方法により作製されると予想され得る、2価酸化物の化学作用は3価酸化物/酸窒化物ガラスのものに非常に似ていると予想され得る。
本明細書では提示された実験結果は、チタン及び白金被覆サファイア基板ならびにチタン及び白金被覆ケイ素基板上へ蒸着された薄膜に関する。しかしながら、好むならば、他の基板も利用され得る。他の好適な例としては、石英、シリカ、ガラス、サファイア、及びフォイルを含む金属基板が挙げられるが、当業者は、他の基板材料もまた好ましいということを理解することになる。基板の必要要件は、適切な蒸着表面が提供され、そして必要な加熱に耐え得るということである。そうでなければ基板材料は、蒸着された化合物が適用される用途を参照して要望通り選択され得る。
本発明に従って蒸着されることができる材料のアモルファス性質は、優れたイオン伝導性と相まって、材料を薄膜電池中の電解質としての使用に好適なものにする。これは主用途であると予想される。本発明の方法は、センサ、太陽電池及び集積回路などの装置内の電池部品の製造に容易に適応可能である。しかしながら、材料は電解質としての使用に限定されなく、本方法は任意の他の用途のアモルファスリチウム含有酸化物又は酸窒化化合物の層を蒸着するために使用され得る。可能な例としては、エレクトロクロミック装置内のセンサ、リチウムセパレータ、界面改質剤及びイオン伝導体が挙げられる。
これまで論述されたように、アモルファスリチウム含有酸化物及び酸窒化化合物の頑強な試料は、高基板温度を使用することにより成分元素の蒸発源から蒸着され得る。しかしながら、先に述べたように、低基板温度で(酸素蒸発源が分子状酸素を供給すれば最大約100℃まで)アモルファス化合物を得ることも可能である。従って、その後高温に晒されれば結晶化に対する耐性が無いこともあり得るアモルファス化合物を必要とするならば、基板を加熱することなく、又は(分子状酸素が使用されれば)基板を適度の量だけ加熱することにより、上述の蒸着方法を利用し得る。
[1]Julien, C. M.; Nazri, G. A., Chapter 1. Design and Optimisation of Solid State Batteries. In Solid State Batteries: Materials Design and Optimization, 1994
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[5]Machida, N.; Tatsumisago, M.; Minami, T., Preparation of amorphous films in the systems Li 2O-SiO 2 and Li 2O-B 2O 3-SiO 2 by RF-sputtering and their ionic conductivity. Yogyo-Kyokai-Shi 1987,95, (1), 135-7
[6](Hu, Z.; Xie, K.; Wei, D.; Ullah, N., Influence of sputtering pressure on the structure and ionic conductivity of thin film amorphous electrolyte. Journal of Materials Science 2011, 46, (23), 7588-7593
[7]Choi, C. H.; Cho, W. I.; Cho, B. W.; Kim, H. S.; Yoon, Y. S.; Tak, Y. S., Radio-Frequency Magnetron Sputtering Power Effect on the Ionic Conductivities of Lipon Films. Electrochemical and Solid-State Letters 2002, 5, (1), A14-A17
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[10]国際公開第2013/011326号
[11]国際公開第2013/011327号
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Claims (26)
- リンを含有しないアモルファスリチウム含有酸化物又は酸窒化化合物を作製する蒸着方法であって、
前記化合物の各成分元素の蒸発源であって、少なくとも、リチウムの源と、酸素の源と、1つ又は複数のガラス形成元素の源又は源群と、を含む蒸発源を提供する工程と、
基板を180℃以上まで加熱する工程と、
前記蒸発源からの成分元素を前記加熱された基板上に共蒸着する工程であって、前記成分元素同士は前記基板上で反応して前記アモルファス化合物を形成する、工程と、を含む方法。 - 前記基板を180℃〜350℃に加熱する工程を含む、請求項1に記載の蒸着方法。
- 前記蒸発源はさらに窒素の源を含み、前記アモルファス化合物は、リンを含有しないリチウム含有酸窒化化合物である、請求項1又は2に記載の蒸着方法。
- 酸素の前記蒸発源は原子状酸素の蒸発源である、請求項1〜3のいずれか1項に記載の蒸着方法。
- 原子状酸素の前記蒸発源はオゾン源を含む、請求項4に記載の蒸着方法。
- 原子状酸素の前記蒸発源はプラズマ源を含む、請求項4に記載の蒸着方法。
- 前記アモルファス化合物は、リンを含有しないリチウム含有酸窒化化合物であり、
前記蒸着方法は、前記加熱された基板上への共蒸着のための混合酸素−窒素プラズマを供給するために窒素を前記プラズマ源の送りへ導入する工程を含む、請求項6に記載の蒸着方法。 - 1つ又は複数のガラス形成元素の前記源又は源群はホウ素の源とケイ素の源とを含み、前記アモルファス化合物はホウケイ酸リチウムである、請求項1、2、4、5及び6のいずれか1項に記載の蒸着方法。
- 前記蒸発源はまた、窒素の源を含み、前記アモルファス化合物は窒素ドープホウケイ酸リチウムである、請求項8に記載の蒸着方法。
- 前記基板を180℃〜275℃まで加熱する工程を含む、請求項8又は9に記載の蒸着方法。
- 前記基板を225℃まで加熱する工程を含む、請求項10に記載の蒸着方法。
- リンを含有しない前記アモルファスリチウム含有酸化物又は酸窒化化合物は、ケイ酸リチウム、酸窒化物ケイ酸リチウム、ホウ酸リチウム、又は酸窒化物ホウ酸リチウムである、請求項1〜7のいずれか1項に記載の蒸着方法。
- 1つ又は複数のガラス形成元素の前記源又は源群は、ホウ素、ケイ素、ゲルマニウム、アルミニウム、ヒ素及びアンチモンのうちの1つ又は複数のものの源を含む、請求項1〜7のいずれか1項に記載の蒸着方法。
- 前記成分元素を前記加熱された基板上へ共蒸着する工程は、前記成分元素を前記加熱された基板の表面上へ直接共蒸着する工程を含む、請求項1〜13のいずれか1項に記載の蒸着方法。
- 前記加熱された基板上へ前記成分元素を共蒸着する工程は、前記基板上に支持された1つ又は複数の層上へ前記成分元素を共蒸着する工程を含む、請求項1〜13のいずれか1項に記載の蒸着方法。
- 電池を作製する方法であって、請求項1〜15のいずれか1項に記載の蒸着方法を使用することにより、前記電池の電解質を、リンを含有しないアモルファスリチウム含有酸化物又は酸窒化化合物の層として蒸着する工程を含む方法。
- リンを含有しないアモルファスリチウム含有酸化物又は酸窒化化合物を作製する蒸着方法であって、
前記化合物の各成分元素の蒸発源であって、少なくとも、リチウムの源と、分子状酸素の源と、1つ又は複数のガラス形成元素の源又は源群と、を含む蒸発源を提供する工程と、
基板を100℃未満の温度で提供する工程と、
前記蒸発源から前記成分元素を前記基板上へ共蒸着する工程であって、前記成分元素同士は前記基板上で反応して前記アモルファス化合物を形成する、工程と、を含む方法。 - 前記基板を18℃〜30℃に加熱する工程を含む、請求項17に記載の蒸着方法。
- 前記基板を25℃まで加熱する工程を含む、請求項17に記載の蒸着方法。
- 前記蒸発源はさらに窒素の源を含み、前記アモルファス化合物は、リンを含有しないリチウム含有酸窒化化合物である、請求項17〜19のいずれか1項に記載の蒸着方法。
- 1つ又は複数のガラス形成元素の前記源又は源群はホウ素の源とケイ素の源とを含み、前記アモルファス化合物はホウケイ酸リチウムである、請求項17〜19のいずれか1項に記載の蒸着方法。
- 前記蒸発源はまた、窒素の源を含み、前記アモルファス化合物は窒素ドープホウケイ酸リチウムである、請求項21に記載の蒸着方法。
- リンを含有しない前記アモルファスリチウム含有酸化物又は酸窒化化合物は、ケイ酸リチウム、酸窒化物ケイ酸リチウム、ホウ酸リチウム、又は酸窒化物ホウ酸リチウムである、請求項17〜21のいずれか1項に記載の蒸着方法。
- 1つ又は複数のガラス形成元素の前記源又は源群は、ホウ素、ケイ素、ゲルマニウム、アルミニウム、ヒ素及びアンチモンのうちの1つ又は複数のものの源を含む、請求項17〜22のいずれか1項に記載の蒸着方法。
- 前記成分元素を前記基板上へ共蒸着する工程は、前記成分元素を前記基板の表面上へ直接共蒸着する工程を含む、請求項17〜24のいずれか1項に記載の蒸着方法。
- 前記基板上へ前記成分元素を共蒸着する工程は、前記基板上に支持された1つ又は複数の層上へ前記成分元素を共蒸着する工程を含む、請求項17〜24のいずれか1項に記載の蒸着方法。
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