JP6272996B2 - 負極材、リチウムイオン二次電池用負極、リチウムイオン二次電池およびそれらの製造方法 - Google Patents
負極材、リチウムイオン二次電池用負極、リチウムイオン二次電池およびそれらの製造方法 Download PDFInfo
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- JP6272996B2 JP6272996B2 JP2016520814A JP2016520814A JP6272996B2 JP 6272996 B2 JP6272996 B2 JP 6272996B2 JP 2016520814 A JP2016520814 A JP 2016520814A JP 2016520814 A JP2016520814 A JP 2016520814A JP 6272996 B2 JP6272996 B2 JP 6272996B2
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- sio
- negative electrode
- secondary battery
- composite oxide
- lithium ion
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Images
Classifications
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H—ELECTRICITY
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Description
まず、図1を用いて本発明のLiイオン電池の概要について説明する。図1は本実施形態の円筒形の電池1の縦断面を示す図である。円筒形の電池1は、正極200と負極300とがセパレータ350を介して対向するように捲回された電極群3(図3参照)と、電解液が電池缶4の内部に注入されて作られる。
正極200を構成する正極材料202は、正極活物質、導電剤、バインダ、及び集電体から構成される。正極活物質を例示すると、LiCoO2、LiNiO2、及びLiMn2O4が代表例である。他には、LiMnO3、LiMn2O3、LiMnO2、Li4Mn5O1 2、LiMn2-xMxO2(ただし、M=Co、Ni、Fe、Cr、Zn、Tiからなる群から選ばれる少なくとも1種、x=0.01〜0.2)、Li2Mn3MO8(ただし、M=Fe、Co、Ni、Cu、Znからなる群から選ばれる少なくとも1種)、Li1-xAxMn2O4(ただし、A=Mg、B、Al、Fe、Co、Ni、Cr、Zn、Caからなる群から選ばれる少なくとも1種、x=0.01〜0.1)、LiNi1-xMxO2(ただし、M=Co、Fe、Gaからなる群から選ばれる少なくとも1種、x=0.01〜0.2)、LiFeO2、Fe2(SO4)3、LiCo1-xMxO2(ただし、M=Ni、Fe、Mnからなる群から選ばれる少なくとも1種、x=0.01〜0.2)、LiNi1-xMxO 2(ただし、M=Mn、Fe、Co、Al、Ga、Ca、Mgからなる群から選ばれる少なくとも1種、x=0.01〜0.2)、Fe(MoO4)3、FeF3、LiFePO4、及びLiMnPO4等を列挙することができる。
セパレータ350には、ポリエチレン、ポリプロピレン等からなるポリオレフィン系高分子シート、又はポリオレフィン系高分子と4フッ化ポリエチレンを代表とするフッ素系高分子シートを溶着させた2層構造等を使用することが可能である。電池温度が高くなったときにセパレータが収縮しないように、セパレータの表面にセラミックス及びバインダの混合物を薄層状に形成してもよい。これらのセパレータは、電池の充放電時にリチウムイオンを透過させる必要があるため、一般に細孔径が0.01〜10μm、気孔率が20〜90%であれば、リチウムイオン電池に使用可能である。
本発明の一実施形態で使用可能な電解液の代表例として、エチレンカーボネートにジメチルカーボネート、ジエチルカーボネート、又はエチルメチルカーボネート等を混合した溶媒に、電解質として六フッ化リン酸リチウム(LiPF6)、又はホウフッ化リチウム(LiBF4)を溶解させた溶液がある。本発明は、溶媒や電解質の種類、溶媒の混合比に制限されることなく、他の電解液も利用可能である。
負極300を構成する負極材302(図3参照)は、SiOにFeとSiO 2 の複合酸化物またはFeおよびFeとSiO 2 との複合酸化物からなる複合体で被覆された粒子に、更に炭素質で被覆された粒子である負極活物質が使用される。
ここでは、コア部30の外周にFeとSiO 2 の複合酸化物被覆層31を形成するまでの工程について説明する。SiOにSi―Feの複合酸化物を被覆する方法としては、SiOより粒子径の小さなFe含有化合物を乳鉢等で混合し、不活性雰囲気下で600℃〜1100℃程度で焼成する事が望ましい。SiOより粒子径の小さいFeを用いる理由としては、SiOの周りにFeの前駆体を均一に分布させるためである。SiOより大きな粒子を用いるとFeおよびその酸化物が偏在することがある。Feが偏在することにより、電極内の活物質の膨張収縮挙動に偏りが生じるため、電極の導電網が破壊されやすくなる。従って、本発明ではSiOよりも粒子径の小さいFeを用いてFeの被覆を作成し、電極の導電網の破壊を抑制している。
本形態の一実施形態における被覆炭素材には、液体および気体の有機化合物を使用できる。
平均粒径5μmに調整されたSiOに対し、平均粒径0.3μmのFe2O3粉末を物質量比でSi:Fe=80:20になるように混合し、自動乳鉢にて30分混練した。
実施例1で用いたFe 2 O 3 粉末の代わりにクエン酸Fe(III)を用いたこと以外は実施例1と同様である。
本実施例は用いたアルギン酸アンモニウムの代わりに、カルボキシメチルセルロース_アンモニウム塩を用いた点が実施例1と異なる。
実施例3において、用いた酸化鉄被覆SiO粉末(実施例1)から実施例2の粉末を用いたこと以外、実施例3と同様な手順で作製した。
実施例1においてSiOを何とも混合せず熱処理したこと以外は、実施例1と同様である。
実施例3において、酸化鉄被覆SiOのかわりに比較例1のSiOを用いた以外、実施例3と同様な手順で作製した。
実施例1においてSiOとFe 2 O 3 の混合粉末を空気中で焼成した以外は実施例1と同様である。
実施例2においてSiOとクエン酸鉄(III)の混合粉末を空気中で焼成した以外は実施例2と同様である。
実施例3において、比較例3で作製した複合粒子に変更にしたこと以外実施例3と同様な手順で作製した。
実施例4において、比較例4で作製した複合粒子に変更にしたこと以外実施例3と同様な手順で作製した。
2:軸芯
3:電極群
4:電池缶
5:絶縁板
6:電池蓋
7、8:導電リード
9:ガスケット
Claims (5)
- 正極と負極を有する電極群が電池缶に収納されたリチウムイオン二次電池において、
前記負極は、負極箔に担持された負極活物質を有し、
前記負極活物質は、SiOを主成分とするコア部と、当該コア部の表面に設けられたFeとSiO 2 との複合酸化物を含む複合酸化物被覆層と、前記複合酸化物被覆層の表面に設けられた炭素被覆層とを有し、
前記複合酸化物被覆層は、微細なFeが分散しており、
前記コア部の表面は、前記コア部を構成する前記SiOのダングリングボンドが前記複合酸化物被覆層に含まれる前記Feによって終端されたSi−O−Fe結合を有することを特徴とするリチウムイオン二次電池。 - 請求項1に記載のリチウムイオン二次電池において、
前記複合酸化物被覆層中の前記Feの物質量とSiの物質量比Fe/Siが50%以下であることを特徴とするリチウムイオン二次電池。 - 請求項2に記載のリチウムイオン二次電池において、
前記FeとSiO 2 との酸化物被覆層の厚さは5nm以上1μm以下であることを特徴とするリチウムイオン二次電池。 - SiO粒子と、前記SiO粒子よりも平均粒径が小さいFe酸化物粒子を混練して混合粉末を作製する工程と、
前記混合粉末を不活性ガス雰囲気下で、600℃から1100℃で加熱する工程と、
前記加熱する工程の後の混合粉末に炭素を被覆する工程を有することを特徴とする負極活物質の製造方法。 - 請求項4に記載の負極活物質の製造方法において、
前記加熱する工程の後の混合粉末に炭素を被覆する工程は、アルギン酸アンモニウム水溶液を添加して乾燥させた後に、800℃から1100℃に加熱する工程であることを特徴とする負極活物質の製造方法。
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