JP5827122B2 - リチウム二次電池用非水電解質及びそれを含むリチウム二次電池 - Google Patents
リチウム二次電池用非水電解質及びそれを含むリチウム二次電池 Download PDFInfo
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Description
Rは−(CH2)n−であり、
nは1〜10の整数であり得る。〕
本発明による非水電解質は、非水電解質100重量部に対し、1〜5重量部のジニトリル系化合物を含む。該含量が1重量部未満であれば、高温寿命性能及び安定性が低下し、5重量部を超過すれば、正極との副反応が増加して気体発生が多くなることで電池の厚さが増加する。
エチレンカーボネート(EC):ジエチルカーボネート(DEC):プロピレンカーボネート(PC)=2:7:1の体積比で混合した溶媒にLiPF6を添加して1M LiPF6溶液を製造した後、非水電解質100重量部に対して1,3‐(1‐プロペン)スルトン(PRS)1重量部、ビニルエチレンカーボネート(VEC)1重量部、フルオロエチレンカーボネート(FEC)5.38重量部、及びコハク酸ニトリル(SN)1重量部を添加して非水電解質を製造した。
ジエチルカーボネートの代わりにジエチルカーボネートとエチルメチルカーボネートとの1:1混合物を使用したことを除き、実施例1と同様の方法で非水電解質を製造した。
エチレンカーボネート(EC):ジエチルカーボネート(DEC):プロピレンカーボネート(PC)=2:7:1の体積比で混合した溶媒にLiPF6を添加して1M LiPF6溶液を製造し、非水電解質とした。
コハク酸ニトリルを使用しないことを除き、実施例1と同様の方法で非水電解質を製造した。
1,3‐(1‐プロペン)スルトン(PRS)を使用しないことを除き、実施例1と同様の方法で非水電解質を製造した。
実施例1〜2及び比較例1〜3によって製造した非水電解質を含み、正極としてLiCoO2、負極として人造黒鉛を使用して通常の方法で円筒型のリチウム二次電池を製造した。製造した電池を23℃及び45℃で400回充放電した後、初期容量に対する容量変化及び厚さ変化を測定した。23℃における容量変化及び厚さ変化の測定データは図1に示し、45℃における容量変化及び厚さ変化の測定データは図2に示した。
Claims (7)
- リチウム二次電池であって、リチウム含有遷移金属酸化物よりなる正極と、リチウムイオンを吸蔵及び放出できる炭素材よりなる負極と、及び非水電解質とを備えてなり、
前記非水電解質が、
リチウム塩と、有機溶媒を含んでなり、
前記非水電解質100重量部に対し、
環状構造内に炭素‐炭素不飽和結合を有するスルトン系化合物1〜5重量部と、
4‐エテニル‐1,3‐ジオキソラン‐2‐オン、4‐エテニル‐4‐メチル‐1,3‐ジオキソラン‐2‐オン、4‐エテニル‐4‐エチル‐1,3‐ジオキソラン‐2‐オン、4‐エテニル‐4‐n‐プロピル‐1,3‐ジオキソラン‐2‐オン、4‐エテニル‐5‐メチル‐1,3‐ジオキソラン‐2‐オン、4‐エテニル‐5‐エチル‐1,3‐ジオキソラン‐2‐オン及び4‐エテニル‐5‐n‐プロピル‐1,3‐ジオキソラン‐2‐オンからなる群より選択されるいずれか一種またはこれらのうち二種以上の混合物である、ビニル基を有する環状カーボネート化合物1〜5重量部と、
ハロゲンに置換された環状カーボネート化合物5〜10重量部と、及び
ジニトリル系化合物1〜5重量部とを含んでなり、
前記の環状構造内に炭素‐炭素不飽和結合を有するスルトン系化合物および前記のビニル基を有する環状カーボネート化合物が重合して前記の負極の表面上にSEI膜が形成されてなる、リチウム二次電池。 - 前記環状構造内に炭素‐炭素不飽和結合を有するスルトン系化合物が、1,3‐(1‐プロペン)スルトンである、請求項1又は2に記載のリチウム二次電池。
- 前記ハロゲンに置換された環状カーボネート化合物が、フルオロエチレンカーボネートである、請求項1〜3のいずれか一項にリチウム二次電池。
- 前記リチウム塩が、LiPF6、LiBF4、LiSbF6、LiAsF6、LiClO4、LiN(C2F5SO2)2、LiN(CF3SO2)2、CF3SO3Li及びLiC(CF3SO2)3からなる群より選択されるいずれか一種またはこれらのうち二種以上の混合物である、請求項1〜5の何れか一項に記載のリチウム二次電池。
- 前記有機溶媒が、プロピレンカーボネート、エチレンカーボネート、ジエチルカーボネート、ジメチルカーボネート、エチルメチルカーボネート、ジプロピルカーボネート、ジメチルスルホキシド、アセトニトリル、ジメトキシエタン、ジエトキシエタン、ビニレンカーボネート、スルホラン、γ‐ブチロラクトン、エチレンスルファート、プロピレンスルファート、テトラヒドロフランからなる群より選択されるいずれか一種またはこれらのうち二種以上の混合物である、請求項1〜6の何れか一項に記載のリチウム二次電池。
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KR20080038767 | 2008-04-25 | ||
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PCT/KR2009/002167 WO2009131419A2 (en) | 2008-04-25 | 2009-04-24 | Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery having the same |
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JP4605133B2 (ja) * | 2006-06-05 | 2011-01-05 | ソニー株式会社 | 非水電解質およびこれを用いた非水電解質電池、並びに非水電解質の製造方法 |
JP4470917B2 (ja) * | 2006-06-29 | 2010-06-02 | ソニー株式会社 | 電極集電体、電池用電極及び二次電池 |
KR100814827B1 (ko) * | 2007-04-05 | 2008-03-20 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 전해질 및 이를 포함하는 리튬 이차 전지 |
US20100266905A1 (en) * | 2007-09-19 | 2010-10-21 | Lg Chem, Ltd. | Non-aqueous electrolyte lithium secondary battery |
KR100980207B1 (ko) * | 2007-10-17 | 2010-09-03 | 주식회사 엘지화학 | 리튬 이차전지용 비수 전해액 및 이를 함유한 리튬이차전지 |
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KR101495296B1 (ko) | 2015-02-24 |
EP2274790A2 (en) | 2011-01-19 |
US8697293B2 (en) | 2014-04-15 |
WO2009131419A2 (en) | 2009-10-29 |
EP2274790B1 (en) | 2014-12-31 |
DK2274790T3 (en) | 2015-03-23 |
JP2011519133A (ja) | 2011-06-30 |
US20110111306A1 (en) | 2011-05-12 |
EP2274790A4 (en) | 2013-01-23 |
CN102017270A (zh) | 2011-04-13 |
KR20120034698A (ko) | 2012-04-12 |
CN102017270B (zh) | 2014-07-16 |
WO2009131419A3 (en) | 2010-02-04 |
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