JP2023515156A - 負極、前記負極の製造方法、二次電池、および前記二次電池の製造方法 - Google Patents
負極、前記負極の製造方法、二次電池、および前記二次電池の製造方法 Download PDFInfo
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- JP2023515156A JP2023515156A JP2022550997A JP2022550997A JP2023515156A JP 2023515156 A JP2023515156 A JP 2023515156A JP 2022550997 A JP2022550997 A JP 2022550997A JP 2022550997 A JP2022550997 A JP 2022550997A JP 2023515156 A JP2023515156 A JP 2023515156A
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- negative electrode
- active material
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- negative
- ethylene carbonate
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- 125000001475 halogen functional group Chemical group 0.000 description 1
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- 229920001519 homopolymer Polymers 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
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- YAMHXTCMCPHKLN-UHFFFAOYSA-N imidazolidin-2-one Chemical compound O=C1NCCN1 YAMHXTCMCPHKLN-UHFFFAOYSA-N 0.000 description 1
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- 239000003273 ketjen black Substances 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
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- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- CASZBAVUIZZLOB-UHFFFAOYSA-N lithium iron(2+) oxygen(2-) Chemical class [O-2].[Fe+2].[Li+] CASZBAVUIZZLOB-UHFFFAOYSA-N 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical group [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 150000004706 metal oxides Chemical class 0.000 description 1
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- 238000013508 migration Methods 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
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- 235000019698 starch Nutrition 0.000 description 1
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229920005608 sulfonated EPDM Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Abstract
Description
本発明が解決しようとする他の課題は、電解液濡れ性が改善された二次電池およびその製造方法を提供することにある。
本明細書において、「比表面積」は、BET法により測定したものであって、具体的には、BEL Japan社のBELSORP-mini IIを用いて、液体窒素温度下(77K)での窒素ガス吸着量から算出することができる。
1.負極
本発明の一実施形態に係る負極は、負極集電体と、前記負極集電体上に配置される第1負極活物質層、および前記第1負極活物質層上に配置される第2負極活物質層を含む負極活物質層と、を含み、前記第1負極活物質層は、エチレンカーボネートを含んでもよい。
本発明の他の実施形態に係る負極の製造方法は、エチレンカーボネートを含む第1負極スラリーにより負極集電体上に第1負極活物質層を形成すること、および第2負極スラリーにより第2負極活物質層を形成することを含むステップを含み、前記第2負極活物質層は、前記第1負極活物質層上に配置されてもよい。これにより製造される負極は、上述した実施形態の負極と同一であってもよい。前記エチレンカーボネート、前記負極集電体、前記第1負極活物質層、前記第2負極活物質層は、負極に関する上述した実施形態にて説明したエチレンカーボネート、負極集電体、第1負極活物質層、第2負極活物質層と同様であるため、その説明は省略する。
第1方法として、前記第1負極スラリーを前記負極集電体上に塗布および乾燥させて前記第1負極活物質層を形成した後、前記第1負極活物質層上に前記第2負極スラリーを塗布および乾燥させて前記第2負極活物質層を形成してもよい。圧延工程は、前記第1負極スラリーの乾燥直後と第2負極スラリーの乾燥直後に行われてもよく、第2負極スラリーの乾燥後にのみ行われてもよい。
本発明のまた他の実施形態に係る二次電池は、負極および電解液を含み、
前記負極は、負極集電体と、前記負極集電体上に配置される第1負極活物質層と、前記第1負極活物質層上に配置される第2負極活物質層と、を含み、前記第1負極活物質層は、エチレンカーボネートを含んでもよい。前記負極集電体および前記第2負極活物質層は、負極に関して上述した実施形態の負極集電体および第2負極活物質層と同様であるため、その説明は省略する。
前記非水系有機溶媒としては、例えば、N-メチル-2-ピロリジノン、プロピレンカーボネート、エチレンカーボネート、ブチレンカーボネート、ジメチルカーボネート、ジエチルカーボネート、γ-ブチロラクトン、1,2-ジメトキシエタン、テトラヒドロフラン、2-メチルテトラヒドロフラン、ジメチルスルホキシド、1,3-ジオキソラン、ホルムアミド、ジメチルホルムアミド、ジオキソラン、アセトニトリル、ニトロメタン、ギ酸メチル、酢酸メチル、リン酸トリエステル、トリメトキシメタン、ジオキソラン誘導体、スルホラン、メチルスルホラン、1,3-ジメチル-2-イミダゾリジノン、プロピレンカーボネート誘導体、テトラヒドロフラン誘導体、エーテル、プロピオン酸メチル、プロピオン酸エチルなどの非プロトン性有機溶媒が用いられてもよい。
本発明のさらに他の実施形態に係る二次電池の製造方法は、負極、正極、およびセパレータを含む電極組立体を製造するステップと、前記電極組立体を電解液に含浸させるステップと、を含んでもよい。前記負極は、負極に関して上述した実施形態の負極と同様である。また、前記正極、前記セパレータ、前記電解液は、二次電池に関して上述した実施形態の正極およびセパレータと同様であるため、その説明は省略する。
実施例および比較例
実施例1:負極および二次電池の製造
(1)負極の製造
負極活物質として人造黒鉛、バインダーとしてカルボキシメチルセルロース(CMC)とスチレンブタジエンゴム(SBR)、導電材としてスーパーP(Super P)、および固相のエチレンカーボネートを溶媒である水に混合および撹拌し、第1負極スラリーを製造した。前記第1負極スラリー中の前記負極活物質、バインダー、導電材、およびエチレンカーボネートの重量比は91:4:1:4であった。
非水溶媒にLi[Ni0.8Co0.1Mn0.1]O2、カーボンブラック、およびPVDFを混合して正極スラリーを製造した後、前記正極スラリーを集電体の両面に塗布した後に乾燥して圧延し、正極活物質層を含む正極を製造した。前記正極活物質層において、Li[Ni0.8Co0.1Mn0.1]O2は95重量%、カーボンブラック(導電材)は2.5重量%、PVDFは2.5重量%で含まれた。
前記セパレータの一面に正極を、他面に負極を位置させた後、貼り合わせて電極組立体を製造した。この際、電極組立体を80℃、5kgf/cmの条件でロール(roll)ラミネート(laminate)した。
前記製造された電極組立体をパウチ型電池ケースに収納し、前記電解液を注入して二次電池を製造した。
第1負極スラリーに投入されるエチレンカーボネートの含量を異にし、前記第1負極活物質層内にエチレンカーボネートが6重量%で含まれるようにしたことを除いては、実施例1と同様の方法で負極および二次電池を製造した。
第1負極スラリーに投入されるエチレンカーボネートの含量を異にし、前記第1負極活物質層内にエチレンカーボネートが2重量%で含まれるようにしたことを除いては、実施例1と同様の方法で負極および二次電池を製造した。
第1負極スラリーの製造時にエチレンカーボネートを投入していないことを除いては、実施例1と同様の方法で負極および二次電池を製造した。
実施例および比較例の二次電池に対して、SOC 0%からSOC 95%まで充電範囲を定めた後(2.5V~4.2V)、1番目のサイクルは、0.2Cの電流速度で充電および放電させつつ放電容量を測定した。2番目のサイクルは、0.5Cの電流速度でSOC 50%まで充電した後、2.5Cで10秒間瞬間放電させ、3番目から100番目のサイクルまで0.5Cの電流速度で充電および放電させた後、容量維持率を確認した。容量維持率は、3番目のサイクル放電容量を100%としたときを基準とし、100番目のサイクルの放電容量から容量維持率を評価し、それを表1に示した。また、100番目のサイクル以後に発生する電圧の減少を印加電流で割って抵抗を計算(DCIR測定法)した後、表1に示した。
210:第1負極活物質層
220:第2負極活物質層
Claims (14)
- 負極集電体と、
前記負極集電体上に配置される第1負極活物質層、および前記第1負極活物質層上に配置される第2負極活物質層を含む負極活物質層と、を含み、
前記第1負極活物質層は、エチレンカーボネートを含む、負極。 - 前記エチレンカーボネートは、前記第1負極活物質層内に0.5重量%~15重量%で含まれる、請求項1に記載の負極。
- 前記エチレンカーボネートは、前記第1負極活物質層内に3重量%~6重量%で含まれる、請求項1に記載の負極。
- 前記第1負極活物質層のローディング量は、50mg/25m2~400mg/25m2である、請求項1に記載の負極。
- 前記負極活物質層のローディング量は、50mg/25m2~600mg/25m2である、請求項1に記載の負極。
- エチレンカーボネートを含む第1負極スラリーにより負極集電体上に第1負極活物質層を形成すること、および第2負極スラリーにより第2負極活物質層を形成することを含むステップを含み、
前記第2負極活物質層は、前記第1負極活物質層上に配置されている、負極の製造方法。 - 前記エチレンカーボネートは、前記第1負極スラリーの固形分中に0.5重量%~15重量%で含まれる、請求項6に記載の負極の製造方法。
- 前記エチレンカーボネートは固相である、請求項6に記載の負極の製造方法。
- 負極、正極、セパレータ、および電解液を含み、
前記負極は、
負極集電体と、
前記負極集電体上に配置される第1負極活物質層と、
前記第1負極活物質層上に配置される第2負極活物質層と、を含み、
前記第1負極活物質層は、エチレンカーボネートを含む、二次電池。 - 前記第1負極活物質層は、孔隙を含み、
前記第1負極活物質層の孔隙率は、前記第2負極活物質層の孔隙率よりも1%~5%さらに大きい、請求項9に記載の二次電池。 - 前記エチレンカーボネートは液相である、請求項9に記載の二次電池。
- 前記電解液は、有機溶媒を含み、
前記有機溶媒は、エチレンカーボネートを含む、請求項9に記載の二次電池。 - 請求項1に記載の負極、正極、およびセパレータを含む電極組立体を製造するステップと、
前記電極組立体を電解液に含浸させるステップと、を含む、二次電池の製造方法。 - 前記電解液は、有機溶媒を含み、
前記有機溶媒は、エチレンカーボネートを含む、請求項13に記載の二次電池の製造方法。
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