JP2023542595A - 電極板、二次電池及びその製造方法、二次電池を含む装置 - Google Patents
電極板、二次電池及びその製造方法、二次電池を含む装置 Download PDFInfo
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Images
Classifications
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- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
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- 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
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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Abstract
Description
本願は、2020年12月09日に提出された名称が「電極板、二次電池及びその製造方法、二次電池を含む装置」の中国特許出願番号202011433363.6の優先権を主張しており、同出願の内容の全ては、ここに参照として取り込まれる。
無水硫酸マグネシウム:MgSO4+7H2O(l)⇔MgSO4・7H2O(s)(2)
無水塩化アルミニウム:Al3++6H2O(l)⇔Al2O3・3H2O(s)+6H+(3)
下記実施例は、本願に開示された内容をより具体的に記述するものであり、これらの実施例は、単に例示的な説明のためにのみ使用される。これは、本願に開示された内容の範囲内で様々な修正及び変更が行われることが当業者にとって明らかであるためである。別段の宣言がない限り、以下の実施例で報告されるすべての部、パーセント、及び比率は、いずれも重量ベースであり、且つ実施例で使用されるすべての試薬は、いずれも市販又は従来の方法で合成して得られ、且つ処理することなく直接使用することができ、実施例で使用される器具は、市販されることができる。
25℃の環境で、各実施例と比較例で製造されたナトリウムイオン電池に対して一回目の充放電を行い、0.1C(すなわち10h内に理論容量を完全に放電する電流値)の充電電流倍率で上限カットオフ電圧4Vまで定電流充電を行い、その後に電流≦0.05Cまで定電圧充電を行い、初回サイクルの充電容量を記録し、5min静置し、0.1Cの放電電流倍率で下限カットオフ電圧2Vまで定電流放電を行い、初回サイクルの放電容量を記録する。上記方法に従って電池に対して15回の充放電サイクルを行い、15回目のサイクルの放電容量を記録する。二次電池のサイクル容量維持率(%)=(15回目のサイクルの放電容量/初回サイクルの放電容量)×100%を計算する。
二次電池の初回放電比容量(mAh/g)=初回サイクルの放電容量(mAh)/二次電池の質量(g)
二次電池の初回充放電効率(%)=初回サイクルの放電容量/初回サイクルの充電容量
(一)正極板は、本願の電極板を採用する
実施例1
正極板の製造
正極活物質Na2MnFe(CN)4、水固定剤の無水硫酸ナトリウム、導電剤カーボンナノチューブ(CNT)、バインダーのポリビニリデンフルオライド(PVDF)を80:5:10:5の重量比で混合し、溶媒NMP内に十分に撹拌して混合し、均一な正極スラリーを形成する。正極スラリーを正極集電体アルミホイルの両側の表面に塗布し、乾燥、冷間プレスを経た後、正極板を得る。
負極活物質のハードカーボン、導電剤のアセチレンブラック、バインダーのスチレンブタジエンゴム(SBR)及び増稠剤のカルボキシメチルセルロースナトリウム(CMC-Na)を96:2:1:1の重量比で脱イオン水溶媒内に十分に撹拌して混合し、均一な負極スラリーを形成する。負極スラリーを負極集電体銅箔の両側の表面に塗布し、乾燥、冷間プレスを経た後、負極板を得る。
ECとPCを1:1の体積比で均一に混合し、溶媒を得て、電解質NaPF6を上記溶媒内に溶解し、均一に混合し、電解液を得て、ここではNaPF6の濃度は、1mol/Lである。
正極板、ガラス繊維多孔質セパレータ、負極板を順番に積層した後、巻き取って電極アセンブリを得て、電極アセンブリをアルミニウム製のハードケースの外装に入れ、電解液を注入してパッケージングし、二次電池を得る。
二次電池の製造は、実施例1と類似しており、正極板の関連製造パラメータが調整されていることが異なり、その内容の詳細は、表1に示すとおりである。
二次電池の製造は、実施例1と類似しており、正極活物質層における水固定剤がヘキサメチルジシラザンに置換されており、ここでは、ヘキサメチルジシラザンの揮発を防止するために、極板の乾燥温度が100℃を超えないことが異なり、その他の内容の詳細は、表1に示すとおりである。
実施例11
二次電池の製造方法は、(一)と類似しており、相違点は、以下の通りである。
正極活物質のNa2MnFe(CN)4、導電剤のカーボンナノチューブ(CNT)、バインダーのポリビニリデンフルオライド(PVDF)を80:10:10の重量比で混合し、溶媒NMP内に十分に撹拌して混合し、均一な正極スラリーを形成する。正極スラリーを正極集電体アルミホイルの両側の表面に塗布し、乾燥、冷間プレスを経た後、正極板を得る。
負極活物質のハードカーボン、水固定剤の無水硫酸ナトリウム、導電剤のアセチレンブラック、バインダーのスチレンブタジエンゴム(SBR)及び増稠剤のカルボキシメチルセルロースナトリウム(CMC-Na)を95:1:2:1:1の重量比で脱イオン水溶媒内に十分に撹拌して混合し、均一な負極スラリーを形成する。負極スラリーを負極集電体銅箔の両側の表面に塗布し、乾燥、冷間プレスを経た後、負極板を得る。
二次電池の製造は、実施例1と類似しており、負極板の関連製造パラメータが調整されていることが異なり、その内容の詳細は、表3に示すとおりである。
二次電池の製造は、実施例1と類似しており、負極活物質層における水固定剤がヘキサメチルジシラザンに置換されていることが異なり、その内容の詳細は、表3に示すとおりである。
2 上ケース
3 下ケース
4 電池モジュール
5 二次電池
10 電極板
51 ハウジング
52 電極アセンブリ
53 蓋板
101 集電体
102 活物質層
Claims (18)
- 集電体と前記集電体の少なくとも一つの表面に設けられる活物質層とを含む電極板であって、
前記活物質層は、活物質と水分を固定することができる固体状の水固定剤とを含む、電極板。 - 前記水固定剤は、物理的吸収及び/又は化学的ボンディングによって水分を固定する、請求項1に記載の電極板。
- 前記水固定剤は、結晶水の形式で水分を固定する、請求項1又は2に記載の電極板。
- 水分を固定した前記水固定剤の80℃での30min熱処理後の含水量WH≦5%×前記水固定剤の飽和吸水量であり、任意選択的に、WH≦1%×前記水固定剤の飽和吸水量である、請求項1~3のいずれか一項に記載の電極板。
- 前記電極板の150℃での30min熱処理後の重量損失率RWL≦15%であり、任意選択的に、RWLは、1%~10%であり、さらに任意選択的に、RWLは、2%~6%である、請求項1~4のいずれか一項に記載の電極板。
- 前記水固定剤の飽和吸水率RSA≧40%であり、任意選択的に、RSA≧80%であり、さらに任意選択的に、RSA≧100%である、請求項1~5のいずれか一項に記載の電極板。
- 前記水固定剤は、10nm~100μmの体積平均粒径Dv50を有する粉体であり、任意選択的に、前記水固定剤のDv50は、50nm~10μmである、請求項1~6のいずれか一項に記載の電極板。
- 前記水固定剤は、無機除水材料を含み、任意選択的に無水硫酸ナトリウム、無水硫酸カルシウム、無水塩化カルシウム、無水硫酸マグネシウム、無水過塩素酸マグネシウム、無水三塩化アルミニウム、活性アルミナとシリカゲルのうちの一つ又は複数を含み、さらに任意選択的に無水硫酸ナトリウムと無水硫酸マグネシウムのうちの一つ又は複数を含む、請求項1~7のいずれか一項に記載の電極板。
- 前記活物質層における前記水固定剤の質量割合は、0.1%~10%であり、任意選択的に、0.5%~5%である、請求項1~8のいずれか一項に記載の電極板。
- 前記電極板は、正極板であり、前記正極板は、正極集電体と前記正極集電体の少なくとも一つの表面に設けられる正極活物質層とを含み、前記正極活物質層は、正極活物質と前記水固定剤とを含む、請求項1~9のいずれか一項に記載の電極板。
- 前記正極活物質層における前記水固定剤の質量割合は、1%~5%である、請求項10に記載の電極板。
- 前記正極活物質は、遷移金属シアン化物を含み、任意選択的に、Na2MnFe(CN)4、Na2FeFe(CN)4、Na2NiFe(CN)4、Na2CuFe(CN)4のうちの一つ又は複数を含む、請求項10又は11に記載の電極板。
- 前記電極板は、負極板であり、前記負極板は、負極集電体と前記負極集電体の少なくとも一つの表面に設けられる負極活物質層とを含み、前記負極活物質層は、負極活物質と前記水固定剤とを含む、請求項1~9のいずれか一項に記載の電極板。
- 前記負極活物質層における前記水固定剤の質量割合は、0.5%~3%である、請求項13に記載の電極板。
- 前記負極活物質は、金属ナトリウム、ソフトカーボン、ハードカーボン、人造グラファイト、天然グラファイト、シリコン、シリコン酸化物、シリコン窒化物、シリコン炭素複合体、遷移金属シアン化物、ナトリウムと合金を形成可能な金属、ポリアニオン化合物、ナトリウム含有遷移金属酸化物のうちの一つ又は複数を含む、請求項13又は14に記載の電極板。
- 正極板と負極板とを含み、前記正極板及び/又は前記負極板は、請求項1~15のいずれか一項に記載の電極板である、二次電池。
- 二次電池の製造方法であって、
活物質と水固定剤を含むスラリーを提供するステップ、
スラリーを集電体の少なくとも一つの表面に塗布し、乾燥、冷間プレスを経た後、電極板を得るステップにより、前記二次電池の前記電極板を製造することを含み、
前記電極板における前記水固定剤は、固体状であり、且つ前記水固定剤は、水分を固定することができる、二次電池の製造方法。 - 請求項16に記載の二次電池及び/又は請求項17に記載の方法で製造された二次電池を含む装置。
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CN112216814B (zh) * | 2020-12-09 | 2021-04-27 | 江苏时代新能源科技有限公司 | 电极极片、二次电池及其制备方法和含有二次电池的装置 |
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US20230187638A1 (en) | 2023-06-15 |
JP7527466B2 (ja) | 2024-08-02 |
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