JP2022515669A - 二次電池用コーティング分離膜及びその製造方法 - Google Patents
二次電池用コーティング分離膜及びその製造方法 Download PDFInfo
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- JP2022515669A JP2022515669A JP2021538283A JP2021538283A JP2022515669A JP 2022515669 A JP2022515669 A JP 2022515669A JP 2021538283 A JP2021538283 A JP 2021538283A JP 2021538283 A JP2021538283 A JP 2021538283A JP 2022515669 A JP2022515669 A JP 2022515669A
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- separation membrane
- secondary battery
- coating
- titanate
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- KQJBQMSCFSJABN-UHFFFAOYSA-N octadecan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCCCCCCCCCCCCCCCC[O-].CCCCCCCCCCCCCCCCCC[O-].CCCCCCCCCCCCCCCCCC[O-].CCCCCCCCCCCCCCCCCC[O-] KQJBQMSCFSJABN-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H01—ELECTRIC ELEMENTS
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/431—Inorganic material
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
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Abstract
Description
M(OH)x
前記式で、MはB、Al、Mg、Co、Cu、Fe、Ni、Ti、Au、Hg、Zn、Sn、Zr又はこれらの酸化物であり、xは1~4の整数である。
M(OH)x
(前記式で、MはB、Al、Mg、Co、Cu、Fe、Ni、Ti、Au、Hg、Zn、Sn、Zr又はこれらの酸化物であり、xは1~4の整数)
重量平均分子量が500,000であり、ヘキサフルオロプロピレンの含量が15重量部であるポリビニリデンフルオリド-ヘキサフルオロプロピレン32重量%、重量平均分子量が400,000であるシアノエチルポリビニルアルコール1.5重量%、無機物としてD50が800nmであるアルミニウム水酸化物(Al(OH)3)65重量%、チタン系カップリング剤であるオレイルチタネート(Oleyl titanate)1.5重量%をアセトンに投入してから混合して分離膜コーティング層用スラリーを製造した。最終のスラリー内での固形分の含量は16重量%である。
前記実施例1で、オレイルチタネート1.5重量%の代わりにシラン系カップリング剤であるビニルトリメトキシシラン(vinyl trimethoxysilane)1.5重量%を使った点を除き、前記実施例1と同様な方法で二次電池用コーティング分離膜を製造した。
前記実施例1で、シアノエチルポリビニルアルコール1.5重量%とオレイルチタネート1.5重量%の代わりにシアノエチルポリビニルアルコール3重量%を使った点を除き、前記実施例1と同様な方法で二次電池用コーティング分離膜を製造した。
前記実施例1で、オレイルチタネート1.5重量%の代わりに脂肪酸系分散剤1.5重量%を使った点を除き、前記実施例1と同様な方法で二次電池用コーティング分離膜を製造した。
長さ60mm及び幅25mmの電極4個と、前記実施例1、実施例2、比較例1及び比較例2で製造された長さ70mm及び幅25mmの分離膜とを準備する。前記それぞれの電極と前記それぞれの分離膜が重なるようにし、90℃、8.5MPaの条件で1秒間加圧して電極と分離膜を付着する。
前記実施例1、実施例2、比較例1及び比較例2で製造されたスラリーを分散分析器(Dispersion Analyzer)(製品名:Lumisizer、製造社:LUM)に入れ、1,000rpmの速度で回転させながら遠心力を加えた後、時間による沈降速度を測定した。
前記実施例1、実施例2、比較例1及び比較例2で製造された分離膜を長さ50mm及び幅50mmのサイズに裁断した後、対流式オーブン(convection oven)に入れ、150℃で30分間放置した後、収縮率を測定した(MD/TD)。
Claims (12)
- 多孔性高分子樹脂からなる分離膜基材、及び前記分離膜基材の少なくとも一面にコートされたコーティング層を含み、
前記コーティング層は無機物及びカップリング剤を含み、
前記無機物は金属又は金属酸化物の水酸化物であり、前記カップリング剤はチタン系(titanate)又はシラン(silane)系カップリング剤である、二次電池用コーティング分離膜。 - 前記金属又は金属酸化物の水酸化物は下記の式で表現される、請求項1に記載の二次電池用コーティング分離膜。
M(OH)x
前記式で、MはB、Al、Mg、Co、Cu、Fe、Ni、Ti、Au、Hg、Zn、Sn、Zr又はこれらの酸化物であり、xは1~4の整数である。 - 前記カップリング剤は、アルキル(alkyl)基、アルコキシ(alkoxyl)基又はエステル(ester)基の中で少なくとも1種以上の作用基を含む物質である、請求項1に記載の二次電池用コーティング分離膜。
- 前記カップリング剤の含量は、前記無機物の含量100重量部を基準に、0.5重量部~30重量部である、請求項1に記載の二次電池用コーティング分離膜。
- 前記コーティング層は分散剤をさらに含む、請求項1に記載の二次電池用コーティング分離膜。
- 前記分散剤は、油溶性ポリアミン、油溶性アミン化合物、脂肪酸類、脂肪アルコール類、及びソルビタン脂肪酸エステルの中から選択されるいずれか1種以上である、請求項5に記載の二次電池用コーティング分離膜。
- 前記コーティング層はバインダーをさらに含む、請求項1に記載の二次電池用コーティング分離膜。
- 前記バインダーは、ポリビニリデンフルオリド-ヘキサフルオロプロピレン(polyvinylidene fluoride-hexafluoropropylene)、ポリビニリデンフルオリド-トリクロロエチレン(polyvinylidene fluoride-trichloroethylene)、ポリメチルメタクリレート(polymethylmethacrylate)、ポリブチルアクリレート(polybutylacrylate)、ポリアクリロニトリル(polyacrylonitrile)、ポリビニルピロリドン(polyvinylpyrrolidone)、ポリビニルアセテート(polyvinylacetate)、ポリエチレンビニルアセテート共重合体(polyethylene-co-vinylacetate)、ポリエチレンオキシド(polyethyleneoxide)、ポリアリレート(polyarylate)、セルロースアセテート(cellulose acetate)、セルロースアセテートブチレート(cellulose acetate butyrate)、セルロースアセテートプロピオネート(cellulose acetate propionate)、シアノエチルプルラン(cyanoethylpullulan)、シアノエチルポリビニルアルコール(cyanoethylpolyvinylalcohol)、シアノエチルセルロース(cyanoethylcellulose)、シアノエチルスクロース(cyanoethylsucrose)、プルラン(pullulan)及びカルボキシルメチルセルロース(carboxylmethylcellulose)からなる群から選択されるいずれか1種又は2種以上の混合物である、請求項7に記載の二次電池用コーティング分離膜。
- 前記チタン系カップリング剤は、モノアルコキシチタネート、ネオアルコキシチタネート、イソプロピルトリジオクチルホスフェートチタネート、イソプロピルトリジオクチルピロホスフェートチタネート、オレイルチタネート、イソプロピルトリオレイルチタネート、イソプロピルトリステアリルチタネート及びイソプロピルトリイソステアリルチタネート、ジ(ジオクチルピロホスフェート)エチルチタネート、モノアルコキシ-ホスフェート系、モノアルコキシホスフェートエステル系及びモノアルコキシピロホスフェート系からなる群から選択されるいずれか1種又は2種以上の混合物である、請求項1に記載の二次電池用コーティング分離膜。
- 前記シラン系カップリング剤は、ビニル基、エポキシ基、アミノ基、アクリルオキシ基、メタクリルオキシ基、メトキシ基、エトキシ基、スチリル基、イソシアヌレート基及びイソシアネート基からなる群から選択される2種以上の作用基を含む、請求項1に記載の二次電池用コーティング分離膜。
- 無機物は金属酸化物をさらに含み、前記金属酸化物は、誘電定数が5以上の金属酸化物、圧電性(piezoelectricity)を有する金属酸化物及びリチウムイオン伝達能力を有する金属酸化物からなる群から選択される1種以上である、請求項1に記載の二次電池用コーティング分離膜。
- 請求項1~11のいずれか一項に記載の二次電池用コーティング分離膜を含む、二次電池。
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