JP7433342B2 - リチウム二次電池用の正極、その製造方法及びそれを含むリチウム二次電池 - Google Patents
リチウム二次電池用の正極、その製造方法及びそれを含むリチウム二次電池 Download PDFInfo
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- JP7433342B2 JP7433342B2 JP2021567040A JP2021567040A JP7433342B2 JP 7433342 B2 JP7433342 B2 JP 7433342B2 JP 2021567040 A JP2021567040 A JP 2021567040A JP 2021567040 A JP2021567040 A JP 2021567040A JP 7433342 B2 JP7433342 B2 JP 7433342B2
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- positive electrode
- active material
- secondary battery
- electrode active
- solid electrolyte
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Images
Classifications
-
- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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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Description
集電体と、
前記集電体の少なくとも一面に位置し、第1正極活物質として、Lix(NiaCobMnc)O2(0.5<x<1.3,a≧0.6,0<b<1,0<c<1,a+b+c=1)を含む第1正極活物質層と、前記第1正極活物質に位置し、第2正極活物質として、LiCoO2、LiMn2O4、LiAl2O3、LiCoPO4、LiFePO4、Lix(NiaCobMnc)O2(0.5<x<1.3,a≦0.5,0<b<1,0<c<1,a+b+c=1)のうちいずれか一つまたはこれらの二種以上の混合物、及び固体電解質を含む第2正極活物質層と、を含むことを特徴とするリチウム二次電池用の正極に関する。
前記第2正極活物質は、前記固体電解質によってコーティングまたはドープされたことを特徴とするリチウム二次電池用の正極に関する。
前記第1正極活物質層の厚さは、前記第2正極活物質層の厚さと同一であるか、またはより厚いことを特徴とするリチウム二次電池用の正極に関する。
前記第1正極活物質の厚さは、20~60μmであることを特徴とするリチウム二次電池用の正極に関する。
前記第2正極活物質の厚さは、10~30μmであることを特徴とするリチウム二次電池用の正極に関する。
前記固体電解質の含量は、前記第2正極活物質層100重量部を基準で20重量部以上であることを特徴とするリチウム二次電池用の正極に関する。
前記固体電解質は、高分子系固体電解質、硫化物系固体電解質、酸化物系固体電解質のうちいずれか一つまたはこれらの混合物であることを特徴とするリチウム二次電池用の正極に関する。
前記固体電解質は酸化物系固体電解質であり、前記酸化物系固体電解質は、LLTO系化合物、Li6La2CaTa2O12、Li6La2ANb2O12(Aは、CaまたはSr)、Li2Nd3TeSbO12、Li3BO2.5N0.5、Li9SiAlO8、LAGP系化合物、LATP系化合物、Li1+xTi2-xAlxSiy(PO4)3-y(ここで、0≦x≦1、0≦y≦1)、LiAlxZr2-x(PO4)3(ここで、0≦x≦1、0≦y≦1)、LiTixZr2-x(PO4)3(ここで、0≦x≦1、0≦y≦1)、LISICON系化合物、LIPON系化合物、ペロブスカイト系化合物、ナシコン系化合物、LLZO系化合物のうちいずれか一種またはこれらの二種以上を含むことを特徴とするリチウム二次電池用の正極に関する。
前記リチウム二次電池は、リチウムイオン二次電池、リチウムポリマー二次電池、リチウム金属二次電池またはリチウムイオンポリマー二次電池のうちいずれか一つであることを特徴とするリチウム二次電池に関する。
第1正極活物質としてLix(NiaCobMnc)O2(0.5<x<1.3、a≧0.6、0<b<1、0<c<1、a+b+c=1)を含む第1正極活物質層が塗布及び乾燥された集電体を準備する段階と、
前記第1正極活物質層の表面に固体電解質及び第2正極活物質としてLiCoO2、LiMn2O4、LiAl2O3、LiCoPO4、LiFePO4、Lix(NiaCobMnc)O2(0.5<x<1.3、a≦0.5、0<b<1、0<c<1、a+b+c=1)のうちいずれか一つまたはこれらの二種以上の混合物が混合されたスラリーを塗布及び乾燥して第2正極活物質層を形成する段階と、を含むことを特徴とするリチウム二次電池用の正極の製造方法に関する。
前記第2正極活物質は、前記固体電解質によってコーティングまたはドープされたことを特徴とするリチウム二次電池用の正極の製造方法に関する。
集電体と、
前記集電体の少なくとも一面に位置し、第1正極活物質として、Lix(NiaCobMnc)O2(0.5<x<1.3,a≧0.6,0<b<1,0<c<1,a+b+c=1)を含む第1正極活物質層と、前記第1正極活物質に位置し、第2正極活物質として、LiCoO2、LiMn2O4、LiAl2O3、LiCoPO4、LiFePO4、Lix(NiaCobMnc)O2(0.5<x<1.3,a≦0.5,0<b<1,0<c<1,a+b+c=1)のうちいずれか一つまたはこれらの二種以上の混合物と固体電解質を含む第2正極活物質層と、を含むことを特徴とする。
第1正極活物質層100重量部を基準にして、第1正極活物質としてLiNi0.88Co0.09Mn0.03O2 95重量部、導電材としてカーボンブラック2.5重量部、バインダー高分子としてポリビニリデンフルオライド(PVDF)2.5重量部を、溶剤であるN-メチル-2-ピロリドンに添加して第1正極活物質スラリーを製造した。
第1正極活物質層の厚さを60μmに制御し、第2正極活物質の厚さを10μmに制御したことを除いては、実施例1と同様の方法でリチウム二次電池用の正極を製造した。
第1正極活物質の厚さを60μmに制御し、第2正極活物質の厚さを30μmに制御したことを除いては、実施例1と同様の方法でリチウム二次電池用の正極を製造した。
第2正極活物質スラリーの製造時、固体電解質を含まないことを除いては、実施例1と同様の方法でリチウム二次電池用の正極を製造した。
正極活物質としてLiNi0.88Co0.09Mn0.03O2を95重量部、導電材としてカーボンブラック2.5重量部及びバインダー高分子としてポリビニリデンフルオライド2.5重量部を、溶剤であるN-メチル-2-ピロリドンに添加して正極活物質スラリーを製造した。
前記実施例1~3及び比較例1、2で各々製造した正極を、リチウムメタル負極と分離膜と共に積層した後、EC:DMC:EMC(1:2:1)溶媒と1MのLiPF6を溶解した電解液を注入し、前記実施例1~3及び比較例1、2によるコイン型ハーフセルを製造した。
前記実施例1~3及び比較例1、2で各々製造した正極をリチウムメタル負極と分離膜と共に積層した後、EC:DMC:EMC(1:2:1)溶媒と1MのLiPF6を溶解した電解液を注入して前記実施例1~3及び比較例1、2によるコイン型ハーフセルを製造した。
Claims (11)
- 集電体と、
前記集電体の少なくとも一面に位置し、第1正極活物質として、Lix(NiaCobMnc)O2(0.5<x<1.3,a≧0.6,0<b<1,0<c<1,a+b+c=1)を含む第1正極活物質層と、
前記第1正極活物質層上であって、前記集電体と反対側の表面に位置し、第2正極活物質として、LiCoO2、LiMn2O4、LiAl2O3、LiCoPO4、LiFePO4、Lix(NiaCobMnc)O2(0.5<x<1.3,a≦0.5,0<b<1,0<c<1,a+b+c=1)のうちいずれか一つまたはこれらの二種以上の混合物、及び固体電解質を含む第2正極活物質層と、を含み、
前記固体電解質の含量が、前記第2正極活物質層100重量部を基準で25重量部以上であることを特徴とする、リチウム二次電池用の正極。 - 前記第2正極活物質が、前記固体電解質によってコーティングされたことを特徴とする、請求項1に記載のリチウム二次電池用の正極。
- 前記第1正極活物質層の厚さが、前記第2正極活物質層の厚さと同一であるか、またはより厚いことを特徴とする、請求項1または2に記載のリチウム二次電池用の正極。
- 前記第1正極活物質の厚さが、20~60μmであることを特徴とする、請求項3に記載のリチウム二次電池用の正極。
- 前記第2正極活物質の厚さが、10~30μmであることを特徴とする、請求項3または4に記載のリチウム二次電池用の正極。
- 前記固体電解質が、高分子系固体電解質、硫化物系固体電解質、酸化物系固体電解質のうちいずれか一つまたはこれらの混合物であることを特徴とする、請求項1から5のいずれか一項に記載のリチウム二次電池用の正極。
- 前記固体電解質が酸化物系固体電解質であり、前記酸化物系固体電解質が、LLTO系化合物、Li6La2CaTa2O12、Li6La2ANb2O12(Aは、CaまたはSr)、Li2Nd3TeSbO12、Li3BO2.5N0.5、Li9SiAlO8、LAGP系化合物、LATP系化合物、Li1+xTi2-xAlxSiy(PO4)3-y(ここで、0≦x≦1、0≦y≦1)、LiAlxZr2-x(PO4)3(ここで、0≦x≦1、0≦y≦1)、LiTixZr2-x(PO4)3(ここで、0≦x≦1、0≦y≦1)、LISICON系化合物、LIPON系化合物、ペロブスカイト系化合物、ナシコン系化合物、LLZO系化合物のうちいずれか一種またはこれらの二種以上を含むことを特徴とする、請求項6に記載のリチウム二次電池用の正極。
- 請求項1から7のいずれか一項に記載の正極、負極及び前記正極と前記負極との間に挟まれた分離膜を含む、リチウム二次電池。
- 前記リチウム二次電池は、リチウムイオン二次電池、リチウムポリマー二次電池、リチウム金属二次電池またはリチウムイオンポリマー二次電池のうちいずれか一つであることを特徴とする、請求項8に記載のリチウム二次電池。
- 第1正極活物質としてLix(NiaCobMnc)O2(0.5<x<1.3、a≧0.6、0<b<1、0<c<1、a+b+c=1)を含む第1正極活物質層が塗布及び乾燥された集電体を準備する段階と、
前記第1正極活物質層の表面に固体電解質及び第2正極活物質としてLiCoO2、LiMn2O4、LiAl2O3、LiCoPO4、LiFePO4、Lix(NiaCobMnc)O2(0.5<x<1.3、a≦0.5、0<b<1、0<c<1、a+b+c=1)のうちいずれか一つまたはこれらの二種以上の混合物が混合されたスラリーを塗布及び乾燥して第2正極活物質層を形成する段階と、を含み、
前記固体電解質の含量が、前記第2正極活物質層100重量部を基準で25重量部以上であることを特徴とする、リチウム二次電池用の正極の製造方法。 - 前記第2正極活物質が、前記固体電解質によってコーティングされたことを特徴とする、請求項10に記載のリチウム二次電池用の正極の製造方法。
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