JP2018107120A - 電気化学デバイスの製造方法 - Google Patents
電気化学デバイスの製造方法 Download PDFInfo
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- JP2018107120A JP2018107120A JP2017214100A JP2017214100A JP2018107120A JP 2018107120 A JP2018107120 A JP 2018107120A JP 2017214100 A JP2017214100 A JP 2017214100A JP 2017214100 A JP2017214100 A JP 2017214100A JP 2018107120 A JP2018107120 A JP 2018107120A
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- electrolyte
- electrochemical device
- gel electrolyte
- gel
- manufacturing
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Abstract
Description
本開示に係る電気化学デバイスの製造方法により得られる電気化学デバイスは、電気化学反応を利用したもの(化学エネルギーと電気エネルギーとを変換可能とするもの)であればよいが、基本的な構成としては、一対の電極と、これらの間に位置する電解質と、を備える構成であればよい。
次に、本開示における電気化学デバイスの代表的な例であるリチウムイオン電池の具体的な構成について、図1を参照して具体的に説明する。
次に、前述したリチウムイオン電池10を例に挙げて、本開示に係る電気化学デバイスの製造方法を図2および図3(A),(B)を参照して具体的に説明する。
[正極の作製]
正極活物質であるLiNi1/3Co1/3Mn1/3O2(NCM)を100g、導電助剤としてカーボンブラック(ティムカル・グラファイト&カーボン社製、製品名:Super−P)を7.8g、バインダ樹脂としてポリフッ化ビニリデン(PVDF,重量平均分子量Mw:約30万、株式会社クレハ製、製品名:#1300)を3.3g、分散媒としてN−メチル−2−ピロリドン(NMP)を38.4g秤量し、それぞれを遊星型ミキサーで混合し、固形分51%の正極活物質層の塗布液を調製した。この塗布液を塗布装置で厚み15μmのアルミニウム箔(正極基材)上にコーティングし、130℃で乾燥した後にロールプレス処理を行い、2.3mg/cm2 の正極活物質層を有する正極を得た。
以下の作業は露点−50℃以下の乾燥空気雰囲気下で実施した。溶媒としてエチレンカーボネート/ジエチルカーボネート=3/7(体積比)を100重量部、リチウムヘキサフルオロリン酸リチウム(LiPF6 )を18重量部、ビニリデンフルオライドとヘキサフルオロプロピレンとの共重合体(PVDF−HFP,重量平均分子量Mw:約38万、株式会社クレハ製、製品名:#8500)10重量部、およびメチルメタクリレート−オキセタニルメタクリレート共重合体(重量平均分子量Mw=約40万、第一工業製薬株式会社製、製品名:ELEXCEL ACG)を5重量部配合して混合した後、自転/公転ミキサーにより均一になるように混錬し、ゲル電解質の塗布液を調製した。
前記の通りに作製した正極に対して、前記の通りに作製したゲル電解質をアプリケータで膜厚が約40μmになるように塗布した後、直径14mmの円形状に打ち抜いて、正極およびゲル電解質で構成される打抜き体を得た。
得られた実施例1に係るリチウムイオン電池について、充放電試験装置(東洋システム株式会社製、製品名:TOSCAT3100)を用いて、25℃の条件下で、0.2C時間率で充電を実行するとともに、0.2Cから1C時間率の条件で放電を実行し、0.1C放電容量に対する1C放電容量の容量保持率(Q1C/Q0.1C)について評価した。その結果、実施例1に係るリチウムイオン電池は、90%の容量保持率を実現することができた。
ゲル電解質の塗布液の調製において、メチルメタクリレート−オキセタニルメタクリレート共重合体5重量部に代えて、四官能ポリエーテルアクリレート(重量平均分子量Mw=約11,000、第一工業製薬株式会社製、製品名:ELEXCEL TA-210)10重量部を配合するとともに、添加剤として、2,2’−アゾビス(2,4−ジメチルバレロニトリル)(和光純薬工業株式会社製、製品名:V−65)0.57重量部を配合した以外は、実施例1と同様にして、実施例2に係るリチウムイオン電池を得た。
ゲル電解質の塗布液の調製において、PVDF−HFPに代えてPVDF(株式会社クレハ製、製品名:#1300)を10重量部配合した以外は、実施例1と同様にして、実施例3に係るリチウムイオン電池を得た。
ゲル電解質の塗布液の調製において、メチルメタクリレート−オキセタニルメタクリレート共重合体5重量部を配合しなかった以外は、実施例1と同様にして、比較例に係るリチウムイオン電池を得た。
11 積層構造体
12 正極
13 負極
14 硬質ゲル電解質
15 封止材
16 ゲル電解質
21 正極基材
22 正極活物質層
31 負極基材
32 負極活物質層
40 封止体
Claims (8)
- 一対の電極と、これらの間に位置する電解質と、を備える電気化学デバイスの製造方法であって、
前記電解質は、少なくともマトリクス材および電解液により構成されるゲル状体であり、かつ、架橋可能な反応基を含む、ゲル電解質の硬化度を上昇させたものであり、
前記ゲル電解質が前記一対の電極の間に保持された状態で、前記反応基の架橋反応を進行させて、前記ゲル電解質の硬化度を上昇させるとともに、架橋反応の進行に伴って当該ゲル電解質から前記電解液を漏出させる、電解質硬化度上昇工程を含むことを特徴とする、
電気化学デバイスの製造方法。 - 前記一対の電極は、正極および負極であり、
これら正極および負極の少なくとも一方は、前記電解質への接触面が多孔質状であることを特徴とする、
請求項1に記載の電気化学デバイスの製造方法。 - 前記一対の電極の少なくとも一方は、前記電解質への接触面に形成された活物質層を含み、
当該活物質層は、活物質を含む塗布液の塗布により形成されることを特徴とする、
請求項1または2に記載の電気化学デバイスの製造方法。 - 前記塗布液には、前記ゲル電解質または前記ゲル電解質の硬化度を上昇させた硬質ゲル電解質が含まれていることを特徴とする、
請求項3に記載の電気化学デバイスの製造方法。 - 前記電解質硬化度上昇工程の前に行われ、前記一対の電極の間で前記ゲル電解質を保持した積層構造体を封止材により封止する封止工程を、さらに含むことを特徴とする、
請求項1から4のいずれか1項に記載の電気化学デバイスの製造方法。 - 前記電解質硬化度上昇工程では、前記ゲル電解質に対して前記積層構造体の外部からエネルギーを供給することにより、前記架橋反応を進行させることを特徴とする、
請求項5に記載の電気化学デバイスの製造方法。 - 前記電解質硬化度上昇工程では、さらに、前記ゲル電解質が、前記正極および前記負極の間に保持された状態で加圧されることを特徴とする、
請求項1から6のいずれか1項に記載の電気化学デバイスの製造方法。 - 前記電気化学デバイスが、リチウムイオン電池、色素増感太陽電池、または電気二重層キャパシタであることを特徴とする、
請求項1から7のいずれか1項に記載の電気化学デバイスの製造方法。
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WO2023075574A1 (ko) * | 2021-11-01 | 2023-05-04 | 주식회사 엘지에너지솔루션 | 겔 폴리머 전해질 이차전지의 제조방법 및 이에 의해 제조된 겔 폴리머 전해질 이차전지 |
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CA2625271A1 (en) | 2008-03-11 | 2009-09-11 | Hydro-Quebec | Method for preparing an electrochemical cell having a gel electrolyte |
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WO2023075574A1 (ko) * | 2021-11-01 | 2023-05-04 | 주식회사 엘지에너지솔루션 | 겔 폴리머 전해질 이차전지의 제조방법 및 이에 의해 제조된 겔 폴리머 전해질 이차전지 |
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