JP2022523812A - 貫通ホールが形成された金属プレートと貫通ホールを充填する多孔性補強材を含む電池用集電体及びそれを含む二次電池 - Google Patents
貫通ホールが形成された金属プレートと貫通ホールを充填する多孔性補強材を含む電池用集電体及びそれを含む二次電池 Download PDFInfo
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Abstract
Description
[数式1]
σ = t/(Rb×A)
アルミニウムホイルに多数の厚さ貫通形ホールを形成した。ポリエチレン樹脂、メチルエチルケトン(MEK)溶媒およびポリフッ化ビニリデン(PVdF)バインダーを100:30:5重量部で混合した溶液を、1次にドクターブレードを利用して表面にコーティングを行うと、溶液が貫通形ホールを詰め、残余物は箔の表面にコーティング層を形成することになる。このとき、2次にドクターブレードを利用して箔の表面の残余コーティング層を拭き取った。コーティング液の種類、組成による粘度と揮発性によって残余コーティング層が十分に除去されない場合には、3次に研磨を通じて残余コーティング層を除去した。
ポリエチレン樹脂の代わりにポリプロピレン樹脂を用いたことを除いては、実施例1と同様の方式で集電体を製造した。
アルミニウム箔に多数の厚さ貫通形ホールを形成した。ポリプロピレン短繊維およびメチルエチルケトン(MEK)溶媒を100:30重量部で混合した溶液を、上記アルミニウム箔の貫通形ホールに充填した。その次に、ロール圧着および乾燥の過程を経た。上記短繊維は、直径が20μmであり、長さと直径の比L/Dが50レベルである。
アルミニウム箔の代わりに銅箔を用いたことを除いては、実施例1と同様の方式で集電体を製造した。
アルミニウム箔に多数の厚さ貫通形ホールを形成した。
正極活物質としてNCM(LiNi0.8Co0.1Mn0.1O2)100重量部、導電材としてカーボンブラック(FX35、Denka)1.5重量部およびバインダー高分子としてポリビニリデンフルオライド(KF9700、Kureha)2.3重量部を溶剤であるNMP(N‐methyl‐2‐pyrrolidone)に添加して正極合剤層スラリーを製造した。上記正極合剤層スラリーを640mg/25cm2のローディング量で実施例1に係る集電体の一面にコーティングした後に真空乾燥して、正極を得た。
実施例1に係る集電体のホールに充填された多孔性補強材に対するイオン伝導度を測定した。イオン伝導度は、実施例1で製造された集電体のホールに充填された多孔性補強材の上部に、金(Au)電極を1mm径の円形でスパッタ(sputter)法を用いてコーティングした後、交流インピーダンス測定法を用いて温度に応じた測定を行った。上記イオン伝導度は、VMP3測定装備と4294Aを用いて、周波数帯域100MHz乃至0.1Hzで測定を行った。
比較例1で製造された集電体に対して、多様な大きさの張力を加え、それに伴う長さの変形及びミーゼス応力(von Mises Stress)を評価した。その結果は下記表1に図示した。
110、210、310:金属プレート
120、220、320:多孔性補強材
400:電極組立体
410:正極集電体
411:正極合剤層
420:負極集電体
421:負極合剤層
431:第1分離膜
432:第2分離膜
Claims (14)
- 多数の厚さ方向貫通ホールが形成された金属プレートと、
前記金属プレートの貫通ホールに充填された多孔性補強材と、を含む、電池用集電体。 - 前記多孔性補強材は、高分子物質、繊維、無機粒子および炭素材からなる群から選択される1種以上を含む、請求項1に記載の電池用集電体。
- 前記貫通ホールが形成された面積分率は、10~90%の範囲内にある、請求項1または2に記載の電池用集電体。
- 前記多孔性補強材は、10~90%の気孔率および100~4000s/100mLの通気度を有する、請求項1から3のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、20℃の条件でイオン伝導度が1×10-10S/cm以上である、請求項1から4のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、ポリエチレン(PE)、ポリプロピレン(PP)、ポリメチルメタクリレート(PMMA)、ポリフッ化ビニリデン(PVdF)、カルボキシメチルセルロース(CMC)、エポキシ樹脂およびウレタン樹脂のうち1種以上を含む、請求項1から5のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、直径が5~50μmであり、長さと直径の比L/Dが20以上の繊維が分散された構造である、請求項1から6のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、リチウム塩をさらに含み、
かつ前記リチウム塩は、
陽イオンとしてLi+を含み、陰イオンとしてF-、Cl-、Br-、I-、NO3 -、N(CN)2 -、BF4 -、ClO4 -、AlO4 -、AlCl4 -、PF6 -、SbF6 -、AsF6 -、BF2C2O4 -、BC4O8 -、(CF3)2PF4 -、(CF3)3PF3 -、(CF3)4PF2 -、(CF3)5PF-、(CF3)6P-、CF3SO3 -、C4F9SO3 -、CF3CF2SO3 -、(CF3SO2)2N-、(FSO2)2N-、CF3CF2(CF3)2CO-、(CF3SO2)2CH-、CF3(CF2)7SO3 -、CF3CO2 -、CH3CO2 -、SCN-及び(CF3CF2SO2)2N-からなる群から選択された1種以上を含む、請求項1から7のいずれか一項に記載の電池用集電体。 - 前記多孔性補強材は、BaTiO3、Pb(Zr、Ti)O3(PZT)、Pb1-aLaaZr1-bTibO3(PLZT、0<a<1、0<b<1)、Pb(Mg1/3Nb2/3)O3‐PbTiO3(PMN‐PT)、酸化ハフニウム(HfO2)、SrTiO3、SnO2、CeO2、MgO、NiO、CaO、ZnO、ZrO2、Y2O3、Al2O3、TiO2及びSiCからなる群から選択される1種の第1無機粒子をさらに含む、請求項1から8のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、リン酸リチウム(Li3PO4)、リン酸リチウムチタン(LicTid(PO4)3、0<d<2、0<d<3)、リン酸リチウムアルミニウムチタン(LiaAlbTic(PO4)3、0<a<2、0<b<1、0<c<3)、(LiAlTiP)aOb(0<a<4、0<b<13)、チタン酸ランタンリチウム(LiaLabTiO3、0<a<2、0<b<3)、チオリン酸リチウムゲルマニウム(LiaGebPcSd、0<a<4、0<b<1、0<c<1、0<d<5)、窒化リチウム(LiaNb、0<a<4、0<b<2)、LiaSibSc(0<a<3、0<b<2、0<c<4)及びLiaPbSc(0<a<3、0<b<3、0<c<7)からなる群から選択される1種の第2無機粒子をさらに含む、請求項1から9のいずれか一項に記載の電池用集電体。
- 前記多孔性補強材は、多孔性高分子基材および前記多孔性高分子基材の一面または両面に形成された多孔性コーティング層を含む、請求項1から10のいずれか一項に記載の電池用集電体。
- 正極、第1分離膜および負極を含む単位セルが繰り返しされ、かつ単位セルと単位セルの間に第2分離膜が介在した構造である電極組立体を含む二次電池であって、
前記正極および前記負極のいずれか一つ以上の電極は、
厚さ方向貫通ホールが形成された金属プレートと、
前記金属プレートの貫通ホールに充填された多孔性補強材とを含む集電体を含む、二次電池。 - 前記正極と前記負極は、それぞれ第1分離膜と対面する方向の集電体の一面に電極合剤層が積層された構造である、請求項12に記載の二次電池。
- 前記正極と前記負極は、それぞれ第1分離膜と対面する方向の集電体の一面に電極合剤層が積層された構造であり、
各集電体は、厚さ方向貫通ホールが形成された金属プレート、および前記金属プレートの貫通ホールに充填された多孔性補強材を含む、請求項12に記載の二次電池。
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2022117960A (ja) * | 2021-02-01 | 2022-08-12 | 本田技研工業株式会社 | 電極および蓄電デバイス |
JP7220313B2 (ja) | 2021-02-01 | 2023-02-09 | 本田技研工業株式会社 | 電極および蓄電デバイス |
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CN113826248A (zh) | 2021-12-21 |
US20220173405A1 (en) | 2022-06-02 |
EP3916861A1 (en) | 2021-12-01 |
EP3916861B1 (en) | 2024-04-17 |
JP7351918B2 (ja) | 2023-09-27 |
WO2021075687A1 (ko) | 2021-04-22 |
KR20210044507A (ko) | 2021-04-23 |
EP3916861A4 (en) | 2022-06-08 |
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