JP2022172307A - 全固体電池の製造方法 - Google Patents
全固体電池の製造方法 Download PDFInfo
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Abstract
Description
一方文献2においてはスラリーの溶媒分を揮発させるのに80℃で30分を要する為リチウムイオンバッテリーの例えば100m/分の現行ラインスピードの代替にするには余りにもラインが長くなりすぎるか、ラインスピードを落とさざるを得ない課題があった。
またいずれの方式もスラリーのバインダーを無くするか、僅少にすると一般的な循環装置ではスラリーが滞りやすい箇所で粒子の沈殿が発生しリチウム電池の電極形成で使用されているダイヘッドでは塗工ができなかった。
本発明では固体電解質粒子である硫化物系、酸化物系の種類を問わない。また正極用または負極用活物質粒子の種類を問わない。
例えば電解質が硫化物系の例えばLPSの場合、正極はリチウム硫黄(Li2S)粒子または硫黄(S8)で良く、負極はグラファイトとシリコンの粒子で良い。
対象物とは正極層、負極層、電解質層及び集電体である。電極スラリー粒子を付着させる場合の対象物は集電体または電解質層であり、電解質スラリー粒子を付着させる場合は主に正極、負極層である。電解質粒子を正極、負極の活物質などの粒子と一緒に集電体に付着させて電極にすることも含まれる。
そのため付着する効率も通常のスプレイの30~50%程度に対して95%以上と高く経済的でもある。
パルスで行うことにより例えば導電助剤などの塗布量を通常のスプレイの10分の1以下にすることもできるので活物質との比率を調整する場合極めて便利である。
距離が短いほど、スプレイパターン角度が狭いほどインパクトは向上する。
同様に正極用集電体に正極用活物質と電解質用スラリーを交互に積層することができる。更に図示していないヘッドを追加して導電助剤のスラリーをパルス的に微量に23あるいは24のヘッドと交互にスプレイできる。
ロールを回転させ、溝に充填されたスラリーを圧縮ガスで粒子化させ対象物に付着させることができる。対象物のスピードは理論的に毎分当たり100メートル以上にすることができる。対象物の移動方向に直交してスラリーの数分、また積層回数の数分のロール装置を配置したら良い。
また同じく本発明人が発明した特開平06-86956を応用しても良い。対象物の幅より広い幅の円筒スクリーンまたはシームレスベルトに貫通した無数の孔例えば直径150マイクロメートル程度の孔にスラリーを充填し対象物と対峙した箇所で液化ガスや圧縮ガスで吹き出すことにより微細に粒子化して対象物に全面に均一に付着する。市販のスクリーン印刷用のロータリースクリーン用のスクリーンを代用すると安価である。また対象物より幅広の円筒パイプに例えば直径0.3mm または0.5mm程度の孔をピッチ1.5mmで千鳥に開けて同様な効果を得ることができる。
上記二つの方法は粒子化して吹き出す位置と対象物の距離は70ミリメートル以下にした方がインパクト効果が向上するので良い。
また上記二つの方法は容積式供給方法を兼ね回転スピードを変えることによりライン追従もできるので高価なポンプやコントローラーなどが不要であり、かつロールコーターやロータリースクリーンプリンターのRoll to Rollの延長線上で装置設計や製造ができるので一部の従来のリチウム電池の電極ラインを改造して利用することも可能である。
移動はパルス的に行うと付着効率とインパクトが高まるのでなお良い。
2,4 電極用活物質スプレイ粒子
2’ 電極用活物質
3,5 電解質スプレイ粒子
3’ 電解質粒子
6 溶媒等スプレイ粒子
7 電極用活物質スプレイ粒子群
8 電解質スプレイ粒子群
10 負極集電体
11 正極層
12 電解質層
13 負極層
21,22,23,24,25 スプレイヘッド
31,31’ ロール
Claims (3)
- 正極用集電体、正極層、電解質層、負極層、負極用集電体が積層された全固体電池の製造方法であって、正極層、負極層、電解質層、集電体から対象物を選択する工程と、前記正極層、電解質層、負極層形成は処理スピードを上げるためスラリーをダイコート、ロールコート、カーテンコート、スクリーンコートから選択して前記対象物に塗布し電極層又は電解質層を形成する工程と、少なくとも電極層または電解質の界面はスラリーを粒子化しインパクトを持って衝突させて少なくとも微細な凹凸表面を形成する工程と、前記接触面積を広くした該凹凸面に相手側のスラリーを塗布しアンカーエフェクト効果で密着性を高め電極層と電解質層の界面抵抗を低くする工程よりなることを特徴とする全固体電池の製造方法。
- 正極用集電体、正極層、電解質層、負極層、負極用集電体が積層された全固体電池の製造方法であって、正極層、負極層、電解質層、集電体から対象物を選択する工程と、広幅ロールの幅方向に複数の溝をピッチごとに設け、該広幅ロール幅方向が対象物の移動方向と直交するように前記ロール装置を設置し、ロールを回転させ前記溝に充填された電極用スラリーまたは電解質用スラリーを圧縮気体で粒子化させる工程と、粒子化させる位置と対象物の距離を70ミリメートル以下としてインパクトを持って粒子化したスラリーを対象物に衝突付着させ、前記対象物の移動方向にスラリーの数(かず)分または積層回数分のロール装置を設置しスラリーを対象物に積層することを特徴とする全固体電池の製造方法。
- 正極用集電体、正極層、電解質層、負極層、負極用集電体が積層された全固体電池の製造方法であって、正極層、負極層、電解質層、集電体から対象物を選択する工程と、円筒スクリーン、シームレスベルト、円筒ロールから選択した少なくともいずれかの貫通した無数の孔に電極用スラリーまたは電解質スラリーを充填し回転させて前記スラリーの容積式供給をする工程と、前記孔部が対象物に対峙した箇所で液化ガスまたは圧縮ガスで噴き出し前記スラリーを微細に粒子化する工程と、対象物との距離を70ミリメートル以下としてインパクトを持って微細に粒子化したスラリーを対象物に衝突付着させ、スラリーの数分または積層回数分のロール装置を設置しスラリーを対象物に積層することを特徴とする全固体電池の製造方法。
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