JP2015535643A - アノード活物質スラリー、そのスラリーを用いたアノード及びそれを含む電気化学素子 - Google Patents
アノード活物質スラリー、そのスラリーを用いたアノード及びそれを含む電気化学素子 Download PDFInfo
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- JP2015535643A JP2015535643A JP2015541707A JP2015541707A JP2015535643A JP 2015535643 A JP2015535643 A JP 2015535643A JP 2015541707 A JP2015541707 A JP 2015541707A JP 2015541707 A JP2015541707 A JP 2015541707A JP 2015535643 A JP2015535643 A JP 2015535643A
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Abstract
Description
このとき、前記ポリアクリル酸カリウムは、ポリアクリル酸と水酸化カリウム(KOH)との中和反応によって形成することができる。
そして、前記ポリアクリル酸の重量平均分子量は、400,000ないし800,000であってもよい。
また、前記中和反応によって形成されたポリアクリル酸カリウムを含む水溶液の水素イオン濃度は、pH7ないしpH9であってもよい。
また、前記アノード活物質スラリーは、23℃、0.1ないし1s-1のせん断速度における粘度が7ないし56Pa・sであってもよい。
なお、前記アノード活物質スラリーは、水系バインダーをさらに含むことができる。
また、前記アノード活物質の平均直径が1μmないし30μmまたは5μmないし20μmであってもよい。
なお、前記アノード活物質は、リチウム金属、炭素材、金属化合物、金属酸化物、またはこれらの混合物を含むことができる。
ここで、前記電気化学素子は、リチウム二次電池であってもよい。
また、比較的小さい重量平均分子量のポリアクリル酸カリウムを使用しても剥離力の高いアノード活物質層を形成することができる。
なお、本発明によるアノード活物質スラリーは、固形分の含量が高いため、アノード活物質層の形成時、分散媒を経済的に乾燥することができる。
このような問題点を解決するために、本発明においては、ポリアクリル酸カリウムを含む高分子バインダーを使用する。
ここで、前記ポリアクリル酸カリウムは、ポリアクリル酸と水酸化カリウム(KOH)との中和反応によって形成することができる。
このとき、前記ポリアクリル酸の重量平均分子量は、400,000ないし800,000であってもよい。
ポリアクリル酸カリウムを含む水溶液は、ポリアクリル酸水溶液よりもすべてのせん断速度の領域において粘度が高いことが分かる。
また、前記アノード活物質スラリーは、水系バインダーをさらに含むことができる。
ここで、前記集電体の非制限的な例としては、金、ニッケルまたは銅合金、またはこれらの組合せによって製造されるホイルなどがある。
また、電気化学素子の外形は、特に制限はないが、缶を使用した円筒状、角形、ポーチ(pouch)型、またはコイン(coin)型などにすることができる。
その中で、代表的には、環形カーボネート、線形カーボネート、またはこれらの混合物であるカーボネート化合物を含むことができる。
(1)アノードの製造
重量平均分子量が450,000程度のポリアクリル酸(Sigma Aldrich社)を含むpH2.21の水溶液を、1Mの水酸化カリウム水溶液で滴定してpH7.94のポリアクリル酸カリウムを含む水溶液を製造した。
LiNi85Co10Al5O2カソード活物質を準備した。その後、カソード活物質:導電材:高分子バインダーを、89:5:6の重量比で混合してスラリーを作った後、通常の方法でアルミニウム(Al)ホイル集電体にコーティングし、乾燥してカソードを製造した。
前記製造されたカソード及びアノードの間にポリエチレン多孔性膜を介して作った電極組立体を用いてポーチ型フルセルを製造した。
ポリアクリル酸カリウムを含む水溶液ではない、pH6.78のカルボキシメチルセルロースを含む水溶液を使用して、pH5.48のアノード活物質スラリーを製造したことを除いては、実施例と同一の方法でアノードを製造した。
前記製造されたポーチ型フルセルを用いて、連続的な充放電条件で容量を測定した。
前記実施例及び比較例によって製造されたアノードに対して剥離力を測定した結果を下記の表1のように示した。
Claims (17)
- アノード活物質スラリーであって、
アノード活物質と、
スチレンブタジエンゴム及びポリアクリル酸カリウムを含む高分子バインダーと、
導電材と、及び
分散媒とを含んでなることを特徴とする、アノード活物質スラリー。 - 前記アノード活物質スラリーが、前記分散媒100重量部を基準として、
前記アノード活物質80ないし100重量部と、
前記高分子バインダー5ないし10重量部と、
前記導電材1ないし5重量部とを含んでなることを特徴とする、請求項1に記載のアノード活物質スラリー。 - 前記ポリアクリル酸カリウムが、ポリアクリル酸と水酸化カリウムとの中和反応によって形成されることを特徴とする、請求項1に記載のアノード活物質スラリー。
- 前記ポリアクリル酸の重量平均分子量が、400,000ないし800,000であることを特徴とする、請求項3に記載のアノード活物質スラリー。
- 前記中和反応によって形成されたポリアクリル酸カリウムを含む水溶液の水素イオン濃度が、pH7ないしpH9であることを特徴とする、請求項3に記載のアノード活物質スラリー。
- 前記アノード活物質スラリーが、23℃、0.1ないし1s-1のせん断速度における粘度が7ないし56Pa・sであることを特徴とする、請求項1に記載のアノード活物質スラリー。
- 前記アノード活物質スラリーが、水系バインダーをさらに含んでなることを特徴とする、請求項1に記載のアノード活物質スラリー。
- 前記水系バインダーが、カルボキシメチルセルロース、ポリテトラフルオロエチレン、ポリエチレン、ポリプロピレン、エチレンプロピレン共重合体、ポリブタジエン、ブチルゴム、フッ素ゴム、ポリエチレンオキサイド、ポリビニルピロリドン、ポリエピクロロヒドリン、ポリホスファゲン、ポリアクリロニトリル、ポリスチレン、エチレンプロピレンジエン共重合体、ポリビニルピリジン、クロロスルホン化ポリエチレン、ラテックス、ポリエステル樹脂、アクリル樹脂、フェノール樹脂、エポキシ樹脂、ポリビニルアルコール及びヒドロキシプロピルセルロースからなる群より選択される何れか一種又は二種以上の混合物を含むことを特徴とする、請求項7に記載のアノード活物質スラリー。
- 前記アノード活物質の平均直径が1μmないし30μmであることを特徴とする、請求項1に記載のアノード活物質スラリー。
- 前記アノード活物質が、リチウム金属、炭素材、金属化合物、金属酸化物、またはこれらの混合物を含むことを特徴とする、請求項1に記載のアノード活物質スラリー。
- 前記金属化合物が、Si、Ge、Sn、Pb、P、Sb、Bi、Al、Ga、In、Ti、Mn、Fe、Co、Ni、Cu、Zn、Ag、Mg、Sr及びBaからなる群より選択される何れか一種又は二種以上の混合物であることを特徴とする、請求項10に記載のアノード活物質スラリー。
- 前記金属酸化物が、珪素酸化物、すず酸化物、チタン酸化物及びリチウムバナジウム系酸化物からなる群より選択される、何れか一種又は二種以上の混合物であることを特徴とする、請求項10に記載のアノード活物質スラリー。
- 前記分散媒が、アセトン、テトラハイドロフラン、メチレンクロライド、クロロホルム、ジメチルホルムアミド、N−メチル−2−ピロリドン、シクロヘキサン及び水からなる群より選択される何れか一種又は二種以上の混合物であることを特徴とする、請求項1に記載のアノード活物質スラリー。
- アノードであって、
集電体と、
前記集電体の一面または両面上に形成されており、請求項1〜13の何れか一項に記載のアノード活物質スラリーの乾燥段階の結果物からなるアノード活物質層とを備えてなる、アノード。 - 前記乾燥段階が、120℃ないし140℃の温度で行われる第1乾燥段階と、及び
80℃ないし100℃の真空状態で行われる第2乾燥段階とを含むことを特徴とする、請求項14に記載のアノード。 - 電気化学素子であって、
カソードと、アノードと、前記カソードと前記アノードとの間に介されたセパレーターと、及び非水電解液とを備えてなり、
前記アノードが請求項14に記載のアノードであることを特徴とする、電気化学素子。 - 前記電気化学素子が、リチウム二次電池であることを特徴とする、請求項16に記載の電気化学素子。
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CN117334918A (zh) * | 2023-12-01 | 2024-01-02 | 宁德时代新能源科技股份有限公司 | 极片、二次电池和用电装置 |
CN117327216B (zh) * | 2023-12-01 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | 聚合物碱金属盐的多分子物及其在制备二次电池中的应用 |
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CN109585850A (zh) | 2019-04-05 |
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US9577263B2 (en) | 2017-02-21 |
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US20150037672A1 (en) | 2015-02-05 |
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