JP2012206916A - リチウムイオン電池用正極活物質用熱処理容器およびその製造方法 - Google Patents
リチウムイオン電池用正極活物質用熱処理容器およびその製造方法 Download PDFInfo
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Abstract
【課題】 リチウム含有化合物用熱処理容器及びその製造方法を提供すること。
【解決手段】 本発明のリチウム含有化合物用熱処理容器は、リチウム含有化合物を熱処理するときにリチウム含有化合物が配されるリチウム含有化合物用熱処理容器において、60〜95mass%でアルミナを含有する基部と、20〜80mass%でスピネルを含有してなり、基部と一体に形成された表面部と、を有することを特徴とする。また、本発明の製造方法は、アルミナ系粉末を配置する工程と、スピネル系粉末をアルミナ系粉末の上方に配置する工程と、圧縮して成形する工程と、焼成する工程と、を有することを特徴とする。
【選択図】 なし
Description
本発明の熱処理容器は、耐熱性の高い材質よりなる基部と、被熱処理化合物に対して反応性の低い材質を多量に含む(主な構成成分とし)表面部と、が一体に形成されていることを特徴とする。
本発明のリチウム含有化合物用熱処理容器(以下、本発明の熱処理容器と称する)は、リチウム含有化合物を熱処理するときにリチウム含有化合物が配されるリチウム含有化合物用熱処理容器である。本発明の熱処理容器において、熱処理されるリチウム含有化合物は、その化学式中にリチウム(Li)を含んでいる化合物であればよく、さらにリチウムを含んでいる化合物を混合した混合物であってもよい。
本発明の熱処理容器の製造方法は、上記の熱処理容器、及び上記熱処理容器をリチウム含有化合物の熱処理に適用するリチウム含有化合物用熱処理容器の製造方法である。すなわち、本発明の製造方法は、それぞれの熱処理容器を製造する製造方法である。
本発明のリチウム含有化合物用熱処理容器の製造方法は、まず、60〜95mass%でアルミナ(Al2O3)を含有するアルミナ系粉末を非圧縮状態で配置する工程を施す。アルミナ系粉末を非圧縮の状態で配置することで、その後の工程で成形したときに、基部の界面が絡み合った界面となり、熱処理容器において基部が界面で剥離しなくなる。また、熱処理容器の体積変化を、より規制することができる。
アルミナ粉末,ムライト粉末,コーディエライト粉末及びその他の添加剤を、表1に示した質量部で秤量し、十分に混合した。これにより、試料A〜Cのアルミナ系粉末を調整した。
試料1〜6の熱処理容器として、リチウム含有化合物(LiNi1/3Co1/3Mn1/3O2)の焼成を行い、試験中の弾性率の変化及び焼成後の状態を観察した。
試料1〜9の熱処理容器の20回の焼成試験後の各試料の断面を観察した。
上記の繰り返しの焼成試験中、試料1〜6の熱処理容器の弾性率を測定した。
試料2,5において、表面部を形成するためのスピネル系粉末において、試料Aまたは試料Cとスピネルの混合割合を変化させた混合粉末を用いたこと以外は、実施例1の時と同様にして、試料10〜19の熱処理容器を製造した。試料10〜19の熱処理容器の表面部の原料の割合を、表3に示した。ここで、試料12と試料17は、それぞれ試料2,試料5と同じである。
試料2,5において、表面部を形成するためのスピネル系粉末において、試料Aまたは試料Cとスピネルの混合割合を変化させた混合粉末を用いたこと以外は、実施例1の時と同様にして、試料20〜25の熱処理容器を製造した。
上記の実施例では、板状の熱処理容器を用いて、ペレット状のリチウム含有化合物の焼成を行ったが、熱処理容器の形状及びリチウム含有化合物の配置形態は、これらに限定されるものではない。
本発明のリチウムイオン電池用正極活物質用熱処理容器(以下、本発明の熱処理容器と称する)は、リチウムイオン電池用正極活物質の原料粉末を熱処理するときに原料粉末が配されるリチウムイオン電池用正極活物質用熱処理容器である。本発明の熱処理容器において、熱処理されるリチウムイオン電池用正極活物質の原料粉末は、その化学式中にリチウム(Li)を含んでいる化合物であればよく、さらにリチウムを含んでいる化合物を混合した混合物であってもよい。
本発明の熱処理容器の製造方法は、上記の熱処理容器、及び上記熱処理容器をリチウムイオン電池用正極活物質の原料粉末の熱処理に適用するリチウムイオン電池用正極活物質用熱処理容器の製造方法である。すなわち、本発明の製造方法は、それぞれの熱処理容器を製造する製造方法である。
本発明のリチウムイオン電池用正極活物質用熱処理容器の製造方法は、まず、60〜95mass%でアルミナ(Al2O3)を含有するアルミナ系粉末を非圧縮状態で配置する工程を施す。アルミナ系粉末を非圧縮の状態で配置することで、その後の工程で成形したときに、基部の界面が絡み合った界面となり、熱処理容器において基部が界面で剥離しなくなる。また、熱処理容器の体積変化を、より規制することができる。
Claims (12)
- リチウム含有化合物を熱処理するときに該リチウム含有化合物が配されるリチウム含有化合物用熱処理容器において、
基部全体を100mass%としたときに、60〜95mass%でアルミナを含有する基部と、
表面部全体を100mass%としたときに、20〜80mass%でスピネルを含有してなり、該基部と一体に形成され、該リチウム含有化合物用熱処理容器のうち該リチウム含有化合物と当接する表面を形成する表面部と、
を有することを特徴とするリチウム含有化合物用熱処理容器。 - 前記表面部は、残部が前記基部を形成する材質よりなる請求項1記載のリチウム含有化合物用熱処理容器。
- 前記表面部は、前記リチウム含有化合物用熱処理容器全体を100mass%としたときに、5〜40mass%で含まれる請求項1〜2のいずれかに記載のリチウム含有化合物用熱処理容器。
- 前記基部は、該基部全体を100mass%としたときに、5〜30mass%でシリカを含有する請求項1〜3のいずれかに記載のリチウム含有化合物用熱処理容器。
- 前記基部は、アルミナとムライトから形成される請求項1〜4のいずれかに記載のリチウム含有化合物用熱処理容器。
- 前記表面部は、前記基部側の界面が、凹凸形状をなしている請求項1〜5のいずれかに記載のリチウム含有化合物用熱処理容器。
- 前記基部は、10〜30%の気孔率を有する請求項1〜6のいずれかに記載のリチウム含有化合物用熱処理容器。
- 60〜95mass%でアルミナを含有するアルミナ系粉末を非圧縮状態で配置する工程と、
20〜80mass%でスピネルを含有するスピネル系粉末を、該アルミナ系粉末の上方に、非圧縮状態で配置する工程と、
該アルミナ系粉末と該スピネル系粉末が重なった方向に圧縮して、成形する工程と、
成形体を焼成する工程と、
を有することを特徴とするリチウム含有化合物用熱処理容器の製造方法。 - 前記スピネル系粉末は、残部が前記アルミナ系粉末である請求項8記載のリチウム含有化合物用熱処理容器の製造方法。
- 前記スピネル系粉末は、全体を100mass%としたときに、20〜80mass%で含まれる請求項8〜9のいずれかに記載のリチウム含有化合物用熱処理容器の製造方法。
- 前記アルミナ系粉末は、全体を100mass%としたときに、5〜30mass%でシリカ粉末を含有する請求項8〜10のいずれかに記載のリチウム含有化合物用熱処理容器の製造方法。
- 前記アルミナ系粉末は、アルミナ粉末とムライト粉末の混合粉末である請求項8〜11のいずれかに記載のリチウム含有化合物用熱処理容器の製造方法。
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