JP2017027700A - リチウムイオン二次電池 - Google Patents
リチウムイオン二次電池 Download PDFInfo
- Publication number
- JP2017027700A JP2017027700A JP2015142841A JP2015142841A JP2017027700A JP 2017027700 A JP2017027700 A JP 2017027700A JP 2015142841 A JP2015142841 A JP 2015142841A JP 2015142841 A JP2015142841 A JP 2015142841A JP 2017027700 A JP2017027700 A JP 2017027700A
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- Prior art keywords
- polypropylene layer
- thickness
- acid
- layer
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 34
- -1 polypropylene Polymers 0.000 claims abstract description 131
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- 239000004743 Polypropylene Substances 0.000 claims abstract description 124
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000010248 power generation Methods 0.000 claims abstract description 10
- 239000003792 electrolyte Substances 0.000 claims abstract description 5
- 230000004927 fusion Effects 0.000 claims description 21
- 239000007774 positive electrode material Substances 0.000 claims description 21
- 239000007773 negative electrode material Substances 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 14
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- 239000000654 additive Substances 0.000 description 15
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
Description
なお、外装体の折り曲げ部400において、ポリプロピレン層71の厚さと酸変性ポリプロピレン層61の厚さとの比が2以上であることがより好ましい。すなわち、B4≧2A4という関係が成り立つことがさらに好ましい。
<正極の作製>
正極活物質としてニッケル・コバルト・マンガン酸リチウム(たとえば、NCM433、すなわちニッケル:コバルト:マンガン=4:3:3、リチウム:ニッケル=1:0.4)と、導電助剤としてカーボンブラック粉末と、バインダー樹脂としてPVDFとを、適切な固形分質量比で混合し、溶媒(たとえばN−メチル−2−ピロリドン(以下、「NMP」と称する。))に添加する。さらに、この混合物に有機系水分捕捉剤(たとえば無水シュウ酸)を添加した上で遊星方式の分散混合を実施することで、これらの材料を均一に分散させてスラリーを作製する。得られたスラリーを、正極集電体となるアルミニウム箔上に塗布する。次いで、スラリーを加熱し、NMPを蒸発させることにより正極活物質層を形成する。さらに、正極活物質層をプレスすることによって、正極集電体の片面上に正極活物質層を塗布した正極を作製することができる。
負極活物質として、黒鉛粉末と、非晶質性炭素粉末(ハードカーボン)とを適切な重量比で混合したものを用いる。この混合材料と、導電助剤としてカーボンブラック粉末と、バインダー樹脂としてPVDFとを、適切な固形分質量比で混合し、NMPに添加して撹拌し、これらの材料をNMP中に均一に分散させてスラリーを作製する。得られたスラリーを、負極集電体となる銅箔上に塗布する。次いで、スラリーを加熱し、NMPを蒸発させることにより負極活物質層を形成する。更に、負極活物質層をプレスすることによって、負極集電体の片面上に負極活物質層を塗布した負極を作製することができる。
上記のように作製した各負極と正極を、各々好適なサイズの矩形に切り出す。このうち、端子を接続するための未塗布部にアルミニウム製の正極リード端子を超音波溶接する。同様に、正極リード端子と同サイズのニッケル製の負極リード端子を負極板における未塗布部に超音波溶接する。ポリプロピレンからなるセパレータの両面に上記負極板と正極板とを両活物質層がセパレータを隔てて重なるように配置して電極板積層体を得る。一方、積層体としてアルミニウムラミネートフィルムを用意する。アルミニウムラミネートフィルムとして、たとえば、ポリエチレンテレフタレート製コーティング層(厚さ12μm)、ナイロン製コーティング層(厚さ15μm)、アルミニウム箔(厚さ80μm)、酸変性ポリプロピレン層(厚さ16μm)およびポリプロピレン層(厚さ64μm)を積層したラミネートフィルムを用いることができる。アルミニウムラミネートフィルムを、上記の正極、負極のサイズの少なくとも2倍以上の面積を有する矩形に切り出す。アルミニウムラミネートフィルムを半分に折り曲げる。半分に折り曲げた外装体に上記電極積層体を挿入し、短辺の一辺より正極リード端子を引き出し、短辺のもう一辺より負極リード端子を引き出す。正極リード端子または負極リード端子を引き出した側の短辺を熱融着させて、外装体を折り曲げ長辺に対向する辺が開口した袋状にする。非水電解液(例として、PCとECとDECとを適切な割合で混合した非水溶媒に、電解質塩としてのLiPF6を適切な濃度になるように溶解させたものに対して、添加剤(たとえばメチレンメタンジスルホン酸エステル(MMDS)とビニレンカーボネート(VC)とをそれぞれ濃度が1重量%となるように溶解させたもの)を外装体の開口部から注液して真空含浸させた後、減圧下にて開口部を熱融着により封止することによって、積層型リチウムイオン電池を得ることができる。
11 負極集電体
12 正極集電体
13 負極活物質層
15 正極活物質層
17 セパレータ
25 負極リード
27 正極リード
29 外装体
31 電解液
100 熱融着部
200 非融着部
300 境界部
400 折り曲げ部
500 折り返し部
291、292 積層体
41、42 コーティング層
51、52 金属基材
61、62 酸変性ポリプロピレン層
71、72 ポリプロピレン層
Claims (5)
- 正極活物質層が正極集電体に配置された正極と、
負極活物質層が負極集電体に配置された負極と、
セパレータと、
電解液と、
を含む発電要素を、外装体内部に含むリチウムイオン二次電池であって、
該外装体が、金属基材と酸変性ポリプロピレン層とポリプロピレン層とがこの順で積層された積層体から構成され、かつ該外装体内面は該ポリプロピレン層であり、
該外装体が、折り曲げ部を有し、
該外装体の該折り曲げ部において、該酸変性ポリプロピレン層の厚さが該ポリプロピレン層の厚さよりも薄い、前記リチウムイオン二次電池。 - 該外装体の該折り曲げ部において、該ポリプロピレン層の厚さと該酸変性ポリプロピレン層の厚さとの比が2以上である、請求項1に記載のリチウムイオン二次電池。
- 該外装体が熱融着部と非熱融着部とを有し、該熱融着部の一部が折り返されている、請求項1または2に記載のリチウムイオン二次電池。
- 該非熱融着部における該酸変性ポリプロピレン層の厚さの値と該ポリプロピレン層の厚さの値の和に対して、該外装体の該折り曲げ部における該酸変性ポリプロピレン層の厚さの値と該ポリプロピレン層の厚さの値の和の割合が50〜95%である、請求項3に記載のリチウムイオン二次電池。
- 該外装体の該折り曲げ部における該酸変性ポリプロピレン層の厚さが、該外装体の該非熱融着部における該酸変性ポリプロピレン層の厚さよりも薄い、請求項3または4に記載のリチウムイオン二次電池。
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CN111989794A (zh) * | 2018-04-19 | 2020-11-24 | 株式会社村田制作所 | 二次电池 |
KR20210077743A (ko) * | 2018-12-18 | 2021-06-25 | 엔지케이 인슐레이터 엘티디 | 리튬 이차 전지 |
WO2022014091A1 (ja) * | 2020-07-17 | 2022-01-20 | 株式会社村田製作所 | 二次電池 |
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JP2010205420A (ja) * | 2009-02-27 | 2010-09-16 | Sanyo Electric Co Ltd | ラミネート電池 |
JP2013157286A (ja) * | 2012-01-31 | 2013-08-15 | Toppan Printing Co Ltd | 蓄電デバイス |
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CN111989794A (zh) * | 2018-04-19 | 2020-11-24 | 株式会社村田制作所 | 二次电池 |
CN111989794B (zh) * | 2018-04-19 | 2023-03-24 | 株式会社村田制作所 | 二次电池 |
KR20210077743A (ko) * | 2018-12-18 | 2021-06-25 | 엔지케이 인슐레이터 엘티디 | 리튬 이차 전지 |
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