JP6995194B2 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
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Description
正極合剤層41aは、前記乾燥後、適度にプレスすることにより、厚さや密度を調整することができる。前記正極集電体上に形成された正極合剤層41aは、エネルギー密度と入出力特性とのバランスが良くなることから、2.0~4.2g/cm3の密度とすることが好ましく、2.6~3.2g/cm3の密度とすることがさらに好ましい。
本実施例では、まず、正極活物質としてのLiNixCoyMnzO2(x+y+z=1、x:y:z=6:2:2、以下、NCM622と略記する)と、導電助剤としてのアセチレンブラック(AB)と、バインダーとしてのポリフッ化ビニリデン(PVdF)とを、NCM622:AB:PFdV=94:3:3(質量比)となるようにして、N-メチルピロリドン(NMP)と混合し、固形分比が55質量%となるように調整することにより、正極スラリーを作成した。次に、厚さ15μmのアルミニウム箔を正極集電体とし、該正極集電体に前記正極スラリーを塗布、乾燥させて24mg/cm2の正極合剤層41aを形成した。
次に、図3に示すように、アルミナ(Al2O3)とポリエチレン(PE)との二層構造からなるセパレータ43,44の間に、それぞれ正極41と負極42とを配置して扁平状に捲き回すことにより、電極体素子40を形成した。次に、電極体素子40の正極集電体端部を正極集電板21の接合片23に、負極集電体端部を負極集電板22の接合片24に、それぞれ超音波溶接にて接合し、発電要素組立体5を形成した。
本比較例では、気体を生成する固体電解質層を全く形成しなかった以外は、実施例1と全く同一にしてリチウムイオン二次電池1を形成した。
本実施例では、負極42及び電解液を次のようにした以外は、実施例1と全く同一にしてリチウムイオン二次電池1を形成した。
本実施例では、実施例2と全く同一にして負極42及び電解液を形成し、気体を生成する固体電解質層を次のようにした以外は、実施例1と全く同一にしてリチウムイオン二次電池1を形成した。
本比較例では、気体を生成する固体電解質層を全く形成しなかった以外は、実施例2と全く同一にしてリチウムイオン二次電池1を形成した。
Claims (8)
- 容器内に、正極合剤層と正極集電体とを有する正極と、該正極集電体の正極合剤層未形成部と電気的に接続する容器内正極端子と、負極合剤層と負極集電体とを有する負極と、該負極集電体の負極合剤層未形成部と電気的に接続する容器内負極端子と、非水電解液と、該容器の内圧が上昇したときに該容器内正極端子又は該容器内負極端子と該容器外部との通電を遮断可能な通電遮断機構とを備える非水電解質二次電池において、
該正極合剤層未形成部、該負極合剤層未形成部、該容器内正極端子及び該容器内負極端子からなる群から選択される少なくとも1つの部材に、該非水電解質二次電池の最大動作電力以上の電圧により反応して該容器の内圧を上昇させ該通電遮断機構を作動可能とする気体を生成する固体電解質層を備えることを特徴とする非水電解質二次電池。 - 請求項1記載の非水電解質二次電池において、前記通電遮断機構は、容器の内圧が上昇したときに形状を変形可能な形状可変部材と、該形状可変部材の変形に伴って脆弱部が破断することにより、前記容器内正極端子又は前記容器内負極端子と前記容器外部との通電を遮断することを特徴とする非水電解質二次電池。
- 請求項2記載の非水電解質二次電池において、前記形状可変部材はダイアフラムであることを特徴とする非水電解質二次電池。
- 請求項1記載の非水電解質二次電池において、前記固体電解質層は、LiF、LiCl、LiI、Li2O、Li2S、Li3N、Li3P、Li10GeP2S12(LGPS)、Li3PS4、Li6PS5Cl、Li7P2S8I、LixPOyNz(x=2y+3z-5、LiPON)、Li7La3Zr2O12(LLZO)、Li3xLa2/3-xTiO3(LLTO)、Li1+xAlxTi2-x(PO4)3(LATP)、Li1.5Al0.5Ge1.5(PO4)3(LAGP)、Li1+x+yAlxTi2-xSiyP3-yO12、Li1+x+yAlx(Ti,Ge)2-xSiyP3-yO12、Li4-2xZnxGeO4(LISICON)から選択される少なくとも1種の材料であることを特徴とする非水電解質二次電池。
- 請求項1記載の非水電解質二次電池において、前記固体電解質層は、正極合剤層未形成部又は正極端子に形成されることを特徴とする非水電解質二次電池。
- 請求項5記載の非水電解質二次電池において、前記固体電解質層は、Li1.5Al0.5Ge1.5(PO4)3(LAGP)、Li7La3Zr2O12(LLZO)又はLi1+xAlxTi2-x(PO4)3(LATP)から選択される少なくとも1種の材料であることを特徴とする非水電解質二次電池。
- 請求項1記載の非水電解質二次電池において、前記固体電解質層は、負極合剤層未形成部又は負極端子に形成されることを特徴とする非水電解質二次電池。
- 請求項7記載の非水電解質二次電池において、前記固体電解質層は、Li4-2xZnxGeO4(LISICON)であることを特徴とする非水電解質二次電池。
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JP2018089474 | 2018-05-07 | ||
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PCT/JP2019/009941 WO2019216018A1 (ja) | 2018-05-07 | 2019-03-12 | 非水電解質二次電池 |
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US (1) | US11417874B2 (ja) |
JP (1) | JP6995194B2 (ja) |
CN (1) | CN112042038B (ja) |
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US9232687B2 (en) | 2010-09-15 | 2016-01-12 | Dawn Equipment Company | Agricultural systems |
JP7328166B2 (ja) * | 2020-03-12 | 2023-08-16 | マクセル株式会社 | 全固体二次電池 |
Citations (3)
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JP2004152619A (ja) | 2002-10-30 | 2004-05-27 | Sony Corp | 非水電解質電池 |
WO2014049848A1 (ja) | 2012-09-28 | 2014-04-03 | 日立ビークルエナジー株式会社 | 角形二次電池 |
JP2017016796A (ja) | 2015-06-29 | 2017-01-19 | トヨタ自動車株式会社 | 全固体電池 |
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Patent Citations (3)
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JP2004152619A (ja) | 2002-10-30 | 2004-05-27 | Sony Corp | 非水電解質電池 |
WO2014049848A1 (ja) | 2012-09-28 | 2014-04-03 | 日立ビークルエナジー株式会社 | 角形二次電池 |
JP2017016796A (ja) | 2015-06-29 | 2017-01-19 | トヨタ自動車株式会社 | 全固体電池 |
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CN112042038A (zh) | 2020-12-04 |
WO2019216018A1 (ja) | 2019-11-14 |
US20210234156A1 (en) | 2021-07-29 |
JPWO2019216018A1 (ja) | 2021-04-22 |
CN112042038B (zh) | 2024-03-08 |
US11417874B2 (en) | 2022-08-16 |
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