JP2016042454A - リチウム二次電池用セパレータ、それを採用したリチウム二次電池及びその製造方法 - Google Patents
リチウム二次電池用セパレータ、それを採用したリチウム二次電池及びその製造方法 Download PDFInfo
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- JP2016042454A JP2016042454A JP2015051918A JP2015051918A JP2016042454A JP 2016042454 A JP2016042454 A JP 2016042454A JP 2015051918 A JP2015051918 A JP 2015051918A JP 2015051918 A JP2015051918 A JP 2015051918A JP 2016042454 A JP2016042454 A JP 2016042454A
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- Prior art keywords
- secondary battery
- separator
- lithium secondary
- coating layer
- dots
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 239000011247 coating layer Substances 0.000 claims abstract description 80
- 229920000642 polymer Polymers 0.000 claims abstract description 47
- 239000002245 particle Substances 0.000 claims abstract description 24
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- 230000009477 glass transition Effects 0.000 claims abstract description 16
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- -1 BaTiO 3 Inorganic materials 0.000 claims description 39
- 239000000758 substrate Substances 0.000 claims description 28
- 239000000178 monomer Substances 0.000 claims description 25
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- 239000010954 inorganic particle Substances 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 17
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
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- 239000002904 solvent Substances 0.000 description 13
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Abstract
Description
コンデンサ、温度計、単量体乳化液導入管、窒素ガス導入管及び撹拌器を装着したフラスコ反応器の内部を窒素で置き換え、軟水40重量部、及びドデシルベンゼンスルホン酸ナトリウム1.5重量部を添加し、70℃に昇温させた。次に、軟水40重量部、下記表1に示されているような組成の単量体乳化液の10重量%を反応器に添加し、5分間撹拌した後、過硫酸アンモニウムの5重量%水溶液10重量部を反応器に添加し、反応を開始させた。1時間後、残りの前記単量体乳化液を3時間にわたって反応器に滴加した。そのとき、過硫酸アンモニウムの5重量%水溶液6重量部を、同時に3時間にわたって滴加した。単量体乳化液体の滴加終了後、反応を2時間さらに続けた後、重合転化率は、98.2%であった。
単量体乳化液を下記表1に示された組成で使用したことを除いては、製造例1と同一の方法によって実施し、アクリル酸エステル系高分子水系エマルジョンA−2を得た。
単量体乳化液を、下記表1に示された組成で使用したことを除いては、製造例1と同一の方法によって実施し、アクリル酸エステル系高分子水系エマルジョンA−3を得た。
単量体乳化液を、下記表1に示された組成で使用したことを除いては、製造例1と同一の方法によって実施し、アクリル酸エステル系高分子水系エマルジョンB−1、及びアクリル酸エステル系高分子水系エマルジョンB−2を得た。
前記製造例1によって製造されたアクリル酸エステル系高分子水系エマルジョンA−1を、グラビアカッタを利用して、厚み18μmのポリエチレン多孔成膜(気孔度45%)の第1面に、乾燥厚が1.0μmになるようにコーティングし、80℃で乾燥させ、第1コーティング層を形成した。その後、前記アクリル酸エステル系高分子水系エマルジョンA−1を、グラビアカッタを利用して、前記ポリエチレン多孔成膜の第2面に、乾燥厚が1.0μmになるようにコーティングし、80℃で乾燥させ、第2コーティング層を形成することにより、セパレータを製造した。
製造例1によって製造されたアクリル酸エステル系高分子水系エマルジョンA−1の代わりに、製造例2及び製造例3によって製造されたアクリル酸エステル系高分子水系エマルジョンA−2及びA−3をそれぞれ使用したことを除いては、実施例1と同一の方法によって実施し、セパレータを製造した。
製造例1によって製造されたアクリル酸エステル系高分子水系エマルジョンA−1の代わりに、比較製造例1及び比較製造例2によって製造されたアクリル酸エステル系高分子水系エマルジョンB−1及びB−2をそれぞれ使用したことを除いては、実施例1と同一の方法によって実施し、セパレータを製造した。
正極活物質としてLiCoO2、バインダとしてポリフッ化ビニリデン(PVDF)、及び導電剤としてカーボンを、92:4:4の重量比で混合した後、N−メチル−2−ピロリドンに分散させ、正極スラリーを製造した。そのスラリーを、厚み20μmのアルミニウムホイルにコーティングした後、乾燥させて圧延し、正極を製造した。
実施例1によって得たセパレータの代わりに、実施例2,3のセパレータをそれぞれ使用したことを除いては、製作例1と同一の方法によって実施し、リチウム二次電池を製造した。
実施例1によって得たセパレータの代わりに、比較例1,2のセパレータをそれぞれ使用したことを除いては、製作例1と同一の方法によって実施し、リチウム二次電池を製造した。
示差走査熱量計(DSC)を利用して、前記製造例1ないし3及び比較製造例1,2によって製造されたアクリルエステル系高分子エマルジョンを利用して製造されたアクリルエステル系高分子のガラス転移温度を測定した。
前記実施例1ないし3及び比較例1,2のセパレータを使用して製造された製作例1ないし3、及び比較製作例1,2による積層型単電池のセパレータと電極との接着力について、UTM(universal testing machine)で、180゜接着強度(peel strength)を評価した。
前記実施例1ないし3、及び比較例1,2のセパレータ2枚を積層し、プレスを使用して、200kgfの圧力で40秒間プレスした後、セパレータ間の接着力を、UTMで180剥離(peel)強度を評価した。
前記実施例1ないし3、及び比較例1,2のセパレータを使用して製造された製作例1ないし3、及び比較製作例1,2のリチウム二次電池であるポーチセルを、25℃で、0.2C rateの電流で、電圧が4.2Vに至るまで定電流充電し、4.2Vを維持しながら、電流が0.01Cになるまで定電圧充電した。次に、放電時に、電圧が3.05Vに至るまで、0.2Cの定電流で放電した(化成段階)。
充放電効率=(1次サイクルでの放電容量/1次サイクルでの充電容量)×100
容量維持率=(30回目のサイクルでの放電容量/最初のサイクルでの放電容量)×100
13 ドット
20 リチウム二次電池
22 負極
23 正極
24 セパレータ
25 電池ケース
26 キャップアセンブリ
Claims (14)
- 多孔性基材、及び前記多孔性基材の一面に形成された第1コーティング層を含み、
前記第1コーティング層は、ガラス転移温度が10℃ないし60℃に調節された(メタ)アクリル酸エステル系高分子を含むリチウム二次電池用セパレータ。 - 前記第1コーティング層は、正極に対面するように配置される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セパレータ。
- 前記(メタ)アクリル酸エステル系高分子のガラス転移温度が、20℃ないし60℃である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セパレータ。
- 前記第1コーティング層は、多数のドットが、互いに所定間隔で離隔されて形成されたドットパターン層であることを特徴とする請求項1から3の何れか1項に記載のリチウム二次電池用セパレータ。
- 前記ドットの平均径は、0.1mmないし1mm、ドット間の間隔は、0.1mmないし10mm、ドットの平均厚は、0.3μmないし10μmであることを特徴とする請求項4に記載のリチウム二次電池用セパレータ。
- 前記多孔性基材の他の一面に、(メタ)アクリル酸エステル系高分子を含む第2コーティング層が形成されたことを特徴とする請求項1から5の何れか1項に記載のリチウム二次電池用セパレータ。
- 前記第2コーティング層は、多数のドットが、互いに所定間隔で離隔されて形成されたドットパターン層である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セパレータ。
- 前記ドットの平均径は、0.1mmないし1mm、ドット間の間隔は、0.1mmないし10mm、ドットの平均厚は、0.3μmないし10μmであることを特徴とする請求項7に記載のリチウム二次電池用セパレータ。
- 前記多孔性基材と第2コーティング層との間に、
コロイダルシリカ、α−アルミナ(α−Al2O3)、γ−アルミナ(γ−Al2O3)、ベーマイト(γ−AlO(OH))、ギブサイト(γ−Al(OH)3)、酸化ジルコニウム、フッ化マグネシウム、BaTiO3、SnO2、CeO2、MgO、NiO、CaO、ZnO、Y2O3、TiO2、SiCのうちから選択された一つ以上の無機粒子を含む無機コーティング層をさらに含むことを特徴とする請求項6から8の何れか1項に記載のリチウム二次電池用セパレータ。 - 前記多孔性基材と第1コーティング層との間に、
コロイダルシリカ、α−アルミナ(α−Al2O3)、γ−アルミナ(γ−Al2O3)、ベーマイト(γ−AlO(OH))、ギブサイト(γ−Al(OH)3)、酸化ジルコニウム、フッ化マグネシウム、BaTiO3、SnO2、CeO2、MgO、NiO、CaO、ZnO、Y2O3、TiO2、SiCのうちから選択された一つ以上の無機粒子を含む無機コーティング層をさらに含むことを特徴とする請求項1から9の何れか1項に記載のリチウム二次電池用セパレータ。 - 前記(メタ)アクリル酸エステル系高分子は、エチレン性不飽和カルボン酸エステル、及び前記エチレン性不飽和カルボン酸エステルと共重合可能な単量体の重合反応生成物であることを特徴とする請求項1から10の何れか1項に記載のリチウム二次電池用セパレータ。
- 正極と、
負極と、
それらの間に介在され、請求項1ないし11のうちいずれか1項に記載のセパレータと、を含むリチウム二次電池。 - 正極と負極とを含み、それらの間に請求項1ないし11のうちいずれか1項に記載のセパレータを介在させて電池組立体を形成する段階と、
前記電池組立体を巻き取るか、あるいは積層させ、それを80℃ないし120℃で熱圧着プレスによって一体化し、一体化された電池組立体を形成する段階と、
前記電池組立体に電解液を含浸する段階と、を含むリチウム二次電池の製造方法。 - 前記セパレータは、多孔性基材、及び前記多孔性基材の一面に(メタ)アクリル酸エステル系高分子粒子を含む水系エマルジョンをコーティングして乾燥させて製造することを特徴とする請求項13に記載のリチウム二次電池の製造方法。
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JP2018510472A (ja) * | 2015-04-02 | 2018-04-12 | エスケー イノベーション カンパニー リミテッドSk Innovation Co.,Ltd. | リチウム二次電池用融着型複合分離膜およびその製造方法 |
JP7073105B2 (ja) | 2015-04-02 | 2022-05-23 | エスケー イノベーション カンパニー リミテッド | リチウム二次電池用融着型複合分離膜およびその製造方法 |
JP2019503577A (ja) * | 2016-04-01 | 2019-02-07 | エルジー・ケム・リミテッド | 接着層を含む電気化学素子用分離膜及び該分離膜を含む電極組立体 |
WO2022163780A1 (ja) * | 2021-01-29 | 2022-08-04 | 日本ゼオン株式会社 | 電気化学素子機能層用組成物、電気化学素子用機能層、電気化学素子用積層体及び電気化学素子 |
WO2023234518A1 (ko) * | 2022-06-03 | 2023-12-07 | 주식회사 엘지에너지솔루션 | 리튬 이차전지용 분리막 및 이를 포함하는 리튬 이차전지 |
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KR20160020283A (ko) | 2016-02-23 |
KR102246767B1 (ko) | 2021-04-30 |
CN105374968A (zh) | 2016-03-02 |
EP3605650A1 (en) | 2020-02-05 |
US10217985B2 (en) | 2019-02-26 |
US20160049628A1 (en) | 2016-02-18 |
CN105374968B (zh) | 2021-03-26 |
JP6585906B2 (ja) | 2019-10-02 |
EP2985813A1 (en) | 2016-02-17 |
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