JP6936851B2 - 非水電解質二次電池およびその製造方法 - Google Patents
非水電解質二次電池およびその製造方法 Download PDFInfo
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- JP6936851B2 JP6936851B2 JP2019515157A JP2019515157A JP6936851B2 JP 6936851 B2 JP6936851 B2 JP 6936851B2 JP 2019515157 A JP2019515157 A JP 2019515157A JP 2019515157 A JP2019515157 A JP 2019515157A JP 6936851 B2 JP6936851 B2 JP 6936851B2
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- aqueous electrolyte
- positive electrode
- active material
- electrolyte secondary
- negative electrode
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 6
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- 239000007773 negative electrode material Substances 0.000 claims description 25
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- 239000010941 cobalt Substances 0.000 claims description 22
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/364—Composites as mixtures
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
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Description
前記正極が、リチウムイオンの脱離および挿入における平均作動電位が3.0V(vs.Li/Li+)以上4.5V(vs.Li/Li+)以下である正極活物質を含み、
さらに、前記正極が、コバルト含有量30重量%以上である化合物を含み、
前記コバルト含有量30重量%以上である化合物の重量をAとし、前記正極活物質の全重量をBとする場合に、0.01≦A/(A+B)≦0.15の関係を満たし、
前記負極が、リチウムイオンの脱離および挿入における平均作動電位が0.5V(vs.Li/Li+)以上2.0V(vs.Li/Li+)未満である負極活物質を含み、
前記非水電解質が、非水溶媒としてプロピレンカーボネートとジエチルカーボネートとを少なくとも含み、プロピレンカーボネートとジエチルカーボネートとの合計量が、前記非水溶媒100体積%に対して70体積%以上であり、
プロピレンカーボネートとジエチルカーボネートとの体積比が1:1〜1:19の範囲である非水電解質二次電池である。
非水電解質は、負極と正極との間のイオン伝達を媒介する。
正極は、リチウムイオンの挿入及び脱離により、非水電解質二次電池の充電及び放電が為され、リチウムイオン挿入及び脱離が可能な正極活物質を含む。
Li1+xMyMn2―x―yO4 (1)
(0≦x≦0.2、0<y≦0.6であり、かつMは2〜13族でかつ第3〜4周期に属する元素(但し、Mnは除く)よりなる群から選択される少なくとも1種の元素を含む)
Li1+xAlyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
Li1+xMgyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
Li1+xZnyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
Li1+xCryMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
が好ましく、
Li1+xAlyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
Li1+xMgyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
がより好ましく、
Li1+xAlyMn2―x―yO4(0≦x≦0.1、0<y≦0.1)、
が更に好ましい。
Li1+aMbMn1―a―bPO4 (2)
(0≦a≦0.1、0≦b≦0.3であり、かつMは2〜13族でかつ第3〜4周期に属する元素(但し、Mnは除く)よりなる群から選択される少なくとも1種の元素を含む)
Li1+aMgbMn1―a―bPO4(0≦a≦0.1、0≦b≦0.3)
Li1+aAlbMn1―a―bPO4(0≦a≦0.1、0≦b≦0.3)
Li1+aFebMn1―a―bPO4(0≦a≦0.1、0≦b≦0.3)
Li1+aMgcFeb−cMn1―a―bPO4
(0≦a≦0.1、0≦b≦0.3、0≦c≦0.1)
がより好ましい。
負極は、リチウムイオンの脱離および挿入における平均作動電位が0.5V(vs.Li/Li+)以上2.0V(vs.Li/Li+)未満である負極活物質を含み、例えば、金属酸化物やリチウム金属酸化物、金属有機構造体が好適に用いられ、チタン酸化合物、チタン酸リチウム、二酸化チタンなどのチタン含有酸化物もしくは金属有機構造体などが好適に用いられる。
セパレータは、正極と負極との間に設置され、これらの間の電子やホールの伝導を阻止しつつ、これらの間のリチウムイオンの伝導を仲介する媒体としての機能を有し、少なくとも電子やホールの伝導性を有さないものである。
封入体は、正極、負極およびセパレータを交互に積層または捲回してなる積層体、ならびに積層体を電気的に接続する端子を封入する部材である。
1≦B/A≦1.2 (3)
但し、Aは正極の面積、Bは負極の面積を示す。
1≦C/B≦1.5 (4)
但し、Bは負極の面積、Cはセパレータの面積を示す。
EC:エチレンカーボネート
PC:プロピレンカーボネート
DMC:ジメチルカーボネート
DEC:ジエチルカーボネート
EMC:エチルメチルカーボネート
正極活物質としてスピネル型のマンガン酸リチウム(Li1.1Al0.1Mn1.8O4)、コバルト含有化合物として、コバルト含有量60重量%(wt%)のコバルト酸リチウム、導電助材としてアセチレンブラック、およびバインダーとしてPVdFのそれぞれを固形分濃度で100重量部、5重量部、5重量部、および5重量部となるように混合し、正極スラリーを作製した。
各部材を表1に従い変更したこと以外は、実施例1と同じとした。
各部材を表1に従い変更したこと以外は、実施例1と同じとした。
実施例および比較例で作製した非水電解質二次電池を、充放電装置(HJ1005SD8、北斗電工社製)に接続し、エージング工程を経た後に充放電を行った。
200回目の容量維持率が80%以上を良好、80%未満を不良とし、かつ、200サイクル終了後のガス発生量が2.0cc未満を良好、2.0cc以上を不良とした。
実施例1〜14は、正極のコバルト含有化合物と溶媒組成の効果により、非水電解質の分解によるガス発生が抑制され、容量維持率の低下が少なく、評価基準を満足する優れたサイクル安定性を有する電池が得られた。これに対して、比較例1〜10は、正極のコバルト含有化合物の種類や量、溶媒組成が異なるために、ガス抑制効果が不十分であるため、評価基準を満足しなかった。
2 正極
3 セパレータ
6 非水電解質
8 封入体
10 非水電解質二次電池
Claims (9)
- 正極と、負極と、非水電解質とを少なくとも備える非水電解質二次電池であって、
前記正極が、リチウムイオンの脱離および挿入における平均作動電位が3.0V(vs.Li/Li+)以上4.5V(vs.Li/Li+)以下である正極活物質を含み、
さらに、前記正極が、コバルト含有量30重量%以上である化合物を含み、
前記コバルト含有量30重量%以上である化合物の重量をAとし、前記正極活物質の全重量をBとする場合に、0.01≦A/(A+B)≦0.15の関係を満たし、
前記負極が、リチウムイオンの脱離および挿入における平均作動電位が0.5V(vs.Li/Li+)以上2.0V(vs.Li/Li+)未満である負極活物質を含み、
前記非水電解質が、非水溶媒としてプロピレンカーボネートとジエチルカーボネートのみからなり、
プロピレンカーボネートとジエチルカーボネートとの体積比が1:1〜1:19の範囲であることを特徴とする、非水電解質二次電池。 - 前記プロピレンカーボネートと前記ジエチルカーボネートの体積比が1:1.5〜1:9の範囲であることを特徴とする、請求項1に記載の非水電解質二次電池。
- 前記コバルト含有量30重量%以上である化合物の重量Aと、前記正極活物質の全重量Bが、0.02≦A/(A+B)≦0.10の関係を満たすことを特徴とする、請求項1または2に記載の非水電解質二次電池。
- 前記コバルト含有量30重量%以上である化合物が、層状岩塩型構造を有しており、LiaNibCocMndXeO2(但し、Xは、B、Mg、Al、Si、Ti、V、Cr、Fe、Cu、Zn、Ga、Ge、Sr、Zr、Nb、Mo、InおよびSnからなる群から選択される少なくとも1種の元素、0<a≦1.2、0≦b≦0.5、0.5≦c≦1、0≦d≦0.5、0≦e≦0.5およびb+c+d+e=1)で表されるリチウム遷移金属複合酸化物であることを特徴とする、請求項1から3のいずれか1項に記載の非水電解質二次電池。
- 前記負極が、負極活物質としてチタン含有酸化物または金属有機構造体のいずれか少なくとも1つを含むことを特徴とする、請求項1から4のいずれか1項に記載の非水電解質二次電池。
- 前記非水溶媒におけるプロピレンカーボネートとジエチルカーボネートとの合計量が、前記非水溶媒100体積%に対して80体積%以上であることを特徴とする、請求項1から5のいずれか1項に記載の非水電解質二次電池。
- 前記正極活物質としてLi1+xMyMn2−x−yO4(0≦x≦0.2、0<y≦0.6、Mは2〜13族でかつ第3〜4周期に属する元素(但し、Mnは除く)からなる群から選択される少なくとも1種の元素)で表されるスピネル型マンガン酸リチウム、または、Li1+aMbMn1―a―bPO4(0≦a≦0.1、0≦b≦0.3、Mは2〜13族でかつ第3〜4周期に属する元素(但し、Mnは除く)からなる群から選択される少なくとも1種の元素)で表されるオリビン型リン酸マンガンリチウムを含むことを特徴とする、請求項1から6のいずれか1項に記載の非水電解質二次電池。
- 請求項1から7のいずれか1項に記載の非水電解質二次電池を複数個接続してなる組電池。
- 正極と、負極と、非水電解質とを備える非水電解質二次電池であって、
前記正極が、リチウムイオンの脱離および挿入における平均作動電位が3.0V(vs.Li/Li+)以上4.5V(vs.Li/Li+)以下である正極活物質を含み、
さらに、前記正極が、コバルト含有量30重量%以上である化合物を含み、
前記コバルト含有量30重量%以上である化合物の重量をAとし、前記正極活物質の全重量をBとする場合に、0.01≦A/(A+B)≦0.15の関係を満たし、
前記負極が、リチウムイオンの脱離および挿入における平均作動電位が0.5V(vs.Li/Li+)以上2.0V(vs.Li/Li+)未満である負極活物質を含み、
前記非水電解質が、非水溶媒としてプロピレンカーボネートとジエチルカーボネートのみからなり、
プロピレンカーボネートとジエチルカーボネートの体積比が1:1〜1:19の範囲であることを特徴とする、非水電解質二次電池の製造方法。
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