JP6249497B2 - 面積が互いに異なる電極を含んでいる電極積層体及びこれを含む二次電池 - Google Patents
面積が互いに異なる電極を含んでいる電極積層体及びこれを含む二次電池 Download PDFInfo
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- JP6249497B2 JP6249497B2 JP2015549287A JP2015549287A JP6249497B2 JP 6249497 B2 JP6249497 B2 JP 6249497B2 JP 2015549287 A JP2015549287 A JP 2015549287A JP 2015549287 A JP2015549287 A JP 2015549287A JP 6249497 B2 JP6249497 B2 JP 6249497B2
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- 229920005608 sulfonated EPDM Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 235000015041 whisky Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Description
陽極、陰極及び多孔性高分子膜は、最外側電極が陰極になるように、平面を基準に高さ方向に積層されており、
陽極材コーティング層のコーティング面積は陰極材コーティング層のコーティング面積より広い構造になっている。
Mは、Al、Mg、Ni、Co、Fe、Cr、V、Ti、Cu、B、Ca、Zn、Zr、Nb、Mo、Sr、Sb、W、Ti及びBiからなる群から選択される一つ以上の元素であり、
Aは−1または−2価の一つ以上の陰イオンである。
この場合、前記リチウム金属酸化物はLiNi0.5Mn1.5O4またはLiNi0.4Mn1.6O4であることができるが、これに限定されるものではない。
a及びbは0.1≦a≦4;0.2≦b≦4の範囲でM’の酸化数(oxidation number)によって決定され、
cは0≦c<0.2の範囲で酸化数によって決定され、
Aは−1または−2価の一つ以上の陰イオンである。
a及びbは0.5≦a≦3;1≦b≦2.5の範囲でM’の酸化数によって決定され、
cは0≦c<0.2の範囲で酸化数によって決定され、
Aは−1または−2価の一つ以上の陰イオンである。
LiNi0.5Mn1.5O4の組成を持つ陽極活物質を使用し、陽極活物質:Super−P:SBR/CMCの量が重量比で95:2.5:2.5となるように計量した後、ミキサーに入れてミキシング(mixing)して陽極合剤を製造した後、20μm厚さのアルミニウムホイルに前記陽極合剤を200μmの厚さでコートした後、圧延及び乾燥して陽極を製造した。
最外層と同様な方法で二つの陽極の間に多孔性高分子膜を介して一つの陰極を挟んだ電極積層体を使ったことを除き、実施例1と同様の方法で電池を製作した。
陽極材コーティング層のコーティング面積が陰極材コーティング層のコーティング面積の90%であり、二つの陽極の間に多孔性高分子膜を介して一つの陰極を挟んだ電極積層体を使ったことを除き、実施例1と同様の方法で電池を製作した。
陽極材コーティング層のコーティング面積が陰極材コーティング層のコーティング面積の90%である電極積層体を使ったことを除き、実施例1と同様の方法で電池を製作した。
実施例1と比較例1、2及び3の電池を用い、25℃の条件で、1C充電、1C放電の条件で充放電を100回繰り返し実施してサイクル特性を評価し、その結果を図5及び図6のグラフで示した。
Claims (13)
- 陽極集電体上に陽極材コーティング層が形成されている陽極;陰極集電体上に陰極材コーティング層が形成されている陰極;及び陽極と陰極の間に挟まれている多孔性高分子膜;を含む電極積層体であって、
陽極、陰極及び多孔性高分子膜は、平面を基準に高さ方向に積層されており、
前記電極積層体の積層方向における両端が陰極であり、
陽極材コーティング層のコーティング面積は陰極材コーティング層のコーティング面積より広く、
前記陰極材コーティング層は、Li 1.33 Ti 1.67 O 4 またはLiTi 2 O 4 を含み、
前記陽極材コーティング層は、下記化学式2で表現されるスピネル構造のリチウム金属酸化物を含んでおり、
陰極の全容量は陽極の全容量より少ないか同じ(N/P ratio≦1)ものであり、
前記電極積層体は、前記陰極が前記陽極間に位置し、前記陽極と前記陰極の間には前記多孔性高分子膜が挟まれている構造の第1単位体と、前記陽極が前記陰極の間に位置し、前記陽極と前記陰極の間には前記多孔性高分子膜が挟まれている構造の第2単位体との組合せからなっており、
前記第1単位体と前記第2単位体の間に挟まれている多孔性高分子膜は、電極端子が形成されていない前記第1単位体及び前記第2単位体のそれぞれの側面を包んでいる分離シートであることを特徴とする、電極積層体:
Li x Ni y Mn 2−y O 4 (2)
前記式で、0.9≦x≦1.2、0.4≦y≦0.5である。 - 単位面積当たり陽極活物質の質量が単位面積当たり陰極活物質の質量より大きいことを特徴とする、請求項1に記載の電極積層体。
- 単位面積当たり陰極の可逆容量に対する単位面積当たり陽極の可逆容量の比は1以下であることを特徴とする、請求項1に記載の電極積層体。
- 陽極厚さは陰極の厚さと同一であることを特徴とする、請求項1に記載の電極積層体。
- 陽極厚さは陰極の厚さより厚いことを特徴とする、請求項1に記載の電極積層体。
- 陽極材コーティング層の体積は陰極材コーティング層の体積と同一であることを特徴とする、請求項1に記載の電極積層体。
- 陽極材コーティング層の体積は陰極材コーティング層の体積より大きく、前記陰極材コーティング層のコーティング体積は、前記陽極材コーティング層のコーティング体積の90%であることを特徴とする、請求項1に記載の電極積層体。
- 前記リチウム金属酸化物は、LiNi0.5Mn1.5O4またはLiNi0.4Mn1.6O4であることを特徴とする、請求項1に記載の電極積層体。
- 前記電極積層体は、分離シート上に第1単位体と第2単位体を配列し、分離シートを巻き取るか折り曲げることで製作されることを特徴とする、請求項1に記載の電極積層体。
- 請求項1〜9のいずれか一項による電極積層体をケースに内蔵された状態でケースを密封したことを特徴とする、リチウム二次電池。
- 25℃の温度で1Cの充電速度で充電し1Cの放電速度で充放電を繰り返すとき、100回での容量維持率が70%以上であることを特徴とする、請求項10に記載のリチウム二次電池。
- 前記リチウム二次電池はリチウムイオン電池であることを特徴とする、請求項10に記載のリチウム二次電池。
- 前記リチウム二次電池はリチウムイオンポリマー電池であることを特徴とする、請求項10に記載のリチウム二次電池。
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JP5689175B2 (ja) * | 2010-07-14 | 2015-03-25 | エルジー・ケム・リミテッド | 電極アセンブリのための折り畳み装置 |
JP2012033279A (ja) * | 2010-07-28 | 2012-02-16 | Nec Energy Devices Ltd | リチウムイオン二次電池 |
KR101334609B1 (ko) * | 2010-12-21 | 2013-11-29 | 주식회사 엘지화학 | 음극 활물질 및 이를 이용한 이차전지 |
JP5691828B2 (ja) | 2011-05-17 | 2015-04-01 | 日本電気株式会社 | 二次電池 |
KR20130011670A (ko) * | 2011-07-22 | 2013-01-30 | 주식회사 엘지화학 | 전기적 안전성이 향상된 리튬 이차전지 |
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- 2014-04-08 US US14/652,862 patent/US9666909B2/en active Active
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EP2919314B1 (en) | 2019-06-12 |
JP2016506603A (ja) | 2016-03-03 |
EP2919314A1 (en) | 2015-09-16 |
US9666909B2 (en) | 2017-05-30 |
KR20140122814A (ko) | 2014-10-21 |
CN104956537B (zh) | 2018-01-26 |
US20160087312A1 (en) | 2016-03-24 |
EP2919314A4 (en) | 2016-05-25 |
WO2014168398A1 (ko) | 2014-10-16 |
CN104956537A (zh) | 2015-09-30 |
KR101603635B1 (ko) | 2016-03-15 |
PL2919314T3 (pl) | 2019-12-31 |
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