JP2011090917A - 非水二次電池およびその製造方法 - Google Patents
非水二次電池およびその製造方法 Download PDFInfo
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- JP2011090917A JP2011090917A JP2009244036A JP2009244036A JP2011090917A JP 2011090917 A JP2011090917 A JP 2011090917A JP 2009244036 A JP2009244036 A JP 2009244036A JP 2009244036 A JP2009244036 A JP 2009244036A JP 2011090917 A JP2011090917 A JP 2011090917A
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Abstract
【解決手段】 巻回電極体を有する非水二次電池であって、セパレータは、融点が80〜170℃の熱可塑性樹脂を主体とする多孔質層(A)と、前記多孔質層(A)よりも耐熱性が高い多孔質層(B)とを有する多層構造であり、正極および負極のうちのいずれか、一方の電極は、両面に2枚の前記セパレータが配置されており、かつ前記2枚のセパレータは、内端およびその近傍、並びに外端およびその近傍において、両者が直接対向しており、前記2枚のセパレータにおける少なくとも内端は、前記多孔質層(A)の構成成分と前記多孔質層(B)の構成成分とが混在した層を有する接合部により接合していることを特徴とする非水二次電池により、前記課題を解決する。
【選択図】 図1
Description
P = 100−(Σai/ρi)×(m/t) (1)
ここで、前記式中、ai:質量%で表した成分iの比率、ρi:成分iの密度(g/cm3)、m:セパレータの単位面積あたりの質量(g/cm2)、t:セパレータの厚み(cm)である。
<セパレータの作製>
有機バインダであるSBRのエマルジョン(固形分比率40質量%):150gと、水:6000gとを容器に入れ、均一に分散するまで室温で攪拌した。この分散液に耐熱温度が150℃以上のフィラーであるベーマイト粉末(板状、平均粒径1μm、アスペクト比10):2000gを4回に分けて加え、ディスパーにより2800rpmで5時間攪拌して均一なスラリー[多孔質層(B)形成用スラリー、固形分比率25.3質量%]を調製した。PE製微多孔膜[多孔質層(A):厚み12μm、空孔率40%、突き刺し強度400gf、PEの融点135℃]を引き取りつつ、その表面に、前記のスラリーをマイクログラビアコーターによって塗布し、乾燥して、厚みが4.0μmの多孔質層(B)を形成することでセパレータを作製した。
正極活物質であるLiCoO2:85質量部、導電助剤であるアセチレンブラック:10質量部、およびバインダであるPVDF:5質量部を、N−メチル−2−ピロリドン(NMP)を溶剤として均一になるように混合して、正極合剤含有ペーストを調製した。このペーストを、集電体となる厚み15μmのアルミニウム箔の両面に、塗布長が表面320mm、裏面250mmになるように間欠塗布し、乾燥した後、カレンダー処理を行って、全厚が150μmになるように正極合剤層の厚みを調整し、幅43mmになるように切断して、長さ340mm、幅43mmの正極を作製した。更にこの正極のアルミニウム箔の露出部にタブ付けを行った。
また、負極活物質である黒鉛:95質量部と、バインダであるPVDF:5質量部とを、NMPを溶剤として均一になるように混合して負極合剤含有ペーストを調製した。この負極合剤含有ペーストを、銅箔からなる厚み10μmの集電体の両面に間欠塗布し、乾燥した後、カレンダー処理を行って全厚が142μmになるように負極合剤層の厚みを調整し、幅45mmになるように切断して負極を作製した。更にこの負極の銅箔の露出部にタブ付けを行った。
前記2枚のセパレータを、互いの多孔質層(B)同士が対向するように重ね、それらの片端を、200℃に加熱しつつ切断して溶着し、前記2枚のセパレータの間に前記の正極を挟み、一方のセパレータの多孔質層(A)に前記の負極を重ねた後、前記2枚のセパレータの切断端同士を溶着した側の内周側として巻回して、巻回電極体を形成した。
前記の巻回電極体を押しつぶして扁平状とし、これを厚み6mm、高さ50mm、幅34mmのアルミニウム製外装缶に入れ、非水電解液(エチレンカーボネートとエチルメチルカーボネートを1:2の体積比で混合した溶媒に、LiPF6を1.2mol/lの濃度で溶解させた溶液)を注入した後に封止を行って、図2に示す構造で図3に示す外観の非水二次電池を得た。
多孔質層(A)に使用するPE製微多孔膜を、厚み12μm、空孔率46%、突き刺し強度300gfのものに変更した以外は、実施例1と同様にしてセパレータを作製し、このセパレータを用いた以外は、実施例1と同様にして非水二次電池を作製した。
巻回電極体の作製時に、2枚のセパレータを室温で切断した以外は、実施例1と同様にして非水二次電池を作製した。
実施例1でセパレータの作製に使用したPE製微多孔膜を、多孔質層(B)を形成せずにセパレータに用いた以外は、実施例1と同様にして非水二次電池を作製した。
PE製微多孔膜(厚み16μm、空孔率46%、突き刺し強度320gf、PEの融点135℃)を、多孔質層(B)を形成せずにセパレータに用いた以外は、実施例1と同様にして非水二次電池を作製した。
40、50 セパレータ
41、51 多孔質層(A)
42、52 多孔質層(B)
60、61 2枚のセパレータの接合部
Claims (8)
- 正極、負極およびセパレータを重ねて巻回した巻回電極体を有する非水二次電池であって、
前記セパレータは、融点が80〜170℃の熱可塑性樹脂を主体とする多孔質層(A)と、前記多孔質層(A)よりも耐熱性が高い多孔質層(B)とを有する多層構造であり、
正極および負極のうちのいずれか一方の電極は、両面に2枚の前記セパレータが配置されており、かつ前記2枚のセパレータは、内端およびその近傍、並びに外端およびその近傍において、両者が直接対向しており、
前記2枚のセパレータにおける少なくとも内端は、前記多孔質層(A)の構成成分と前記多孔質層(B)の構成成分とが混在した層を有する接合部により接合していることを特徴とする非水二次電池。 - 前記2枚のセパレータにおける外端が、多孔質層(A)の構成成分と多孔質層(B)の構成成分とが混在した層を有する接合部により接合している請求項1に記載の非水二次電池。
- セパレータは、静置したときに、いずれか一方の面方向に反りが生じるものである請求項1または2に記載の非水二次電池。
- 両面に2枚のセパレータが配置されている電極が正極である請求項1〜3のいずれかに記載の非水二次電池。
- 両面に2枚のセパレータが配置されている電極が負極である請求項1〜3のいずれかに記載の非水二次電池。
- セパレータにおける多孔質層(B)が、耐熱温度が150℃以上のフィラーを主体として含んでいる請求項1〜5のいずれかに記載の非水二次電池。
- セパレータの多孔質層(B)が正極に対向している請求項6に記載の非水二次電池。
- 請求項1〜7のいずれかに記載の非水二次電池を製造する方法であって、
2枚のセパレータを同時に加熱しつつ切断して、両セパレータの切断端同士を溶着する工程と、正極および負極のいずれか一方の電極の両面に前記2枚のセパレータを配置する工程と、前記2枚のセパレータのいずれか一方に対向させて他方の電極を配置する工程とを経て積層体を形成する工程、および
前記積層体を、前記2枚のセパレータの切断端同士を溶着した側を少なくとも内周側として巻回して巻回電極体を形成する工程を有しており、
前記積層体を形成する工程において、セパレータを加熱しつつ切断する際の温度を、多孔質層(A)の主体である熱可塑性樹脂の融点よりも高い温度であり、かつ多孔質層(B)の耐熱温度よりも低い温度とすることを特徴とする非水二次電池の製造方法。
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