JP2012015100A - 蓄電装置及びその作製方法 - Google Patents
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Abstract
【解決手段】集電体と、集電体上に形成される混合層と、混合層上に形成される活物質層として機能する結晶性シリコン層とを有し、結晶性シリコン層は、結晶性シリコン領域と、結晶性シリコン領域上に突出する複数の突起を有するウィスカー状の結晶性シリコン領域とを有する蓄電装置である。ウィスカー状の結晶性シリコン領域は、屈曲または枝分かれした部位を有する突起を有する。
【選択図】図1
Description
本実施の形態では、本発明の一態様である蓄電装置の電極及びその作製方法について説明する。
本実施の形態では、蓄電装置の構造について、図3を用いて説明する。
本実施の形態では、実施の形態2で説明した蓄電装置の応用形態について図4を用いて説明する。
本実施の形態では、本発明の一態様に係る蓄電装置の一例である二次電池を、無線給電システム(以下、RF給電システムと呼ぶ。)に用いた場合の一例を、図5及び図6のブロック図を用いて説明する。なお、各ブロック図では、受電装置および給電装置内の構成要素を機能ごとに分類し、互いに独立したブロックとして示しているが、実際の構成要素は機能ごとに完全に切り分けることが困難であり、一つの構成要素が複数の機能に係わることもあり得る。
まず、二次電池の電極の作製工程を説明する。
上記工程により得られた結晶性シリコン層の平面SEM(scanning electron microscope)写真を図7に示す。
本実施例の二次電池の作製工程を示す。
次に、比較二次電池の電極の作製工程を説明する。本発明の一態様である二次電池と比較二次電池とは、活物質層の作製工程が異なる。それ以外の構成は共通しているため、基板、集電体等の構成は省略する。
比較二次電池の作製工程を示す。
充放電測定機を用いて、二次電池、比較二次電池の放電容量を測定した。充放電の測定には定電流方式を採用し、2.0mAの電流で充放電し、上限電圧を1.0V、下限電圧を0.03Vとして行った。すべての測定は、室温で行った。
まず、電極の作製工程を説明する。
上記工程により得られた結晶性シリコン層の平面SEM(scanning electron microscope)写真を図12(A)、(B)に示す。
103 活物質層
103a 結晶性シリコン領域
103b 結晶性シリコン領域
105 破線
107 混合層
109 金属酸化物層
111 集電体
114a 突起
114b 突起
114c 突起
115 基板
151 蓄電装置
153 外装部材
155 蓄電セル
157 端子部
159 端子部
163 負極
165 正極
167 セパレータ
169 電解質
171 負極集電体
173 負極活物質層
175 正極集電体
177 正極活物質層
200 集電体
202 活物質層
204 電極
206 筐体
210 セパレータ
220 リング状絶縁体
230 参照電極活物質層
232 参照電極
240 スペーサー
242 ワッシャー
244 筐体
300 自動車
302 蓄電装置
401 チタン膜
402 結晶性シリコン層
403 空隙
404 界面近傍
405 層
411 領域
412 領域
415 領域
416 領域
441 突起
450 突起
460 突起
600 受電装置
601 受電装置部
602 受電装置用アンテナ回路
603 信号処理回路
604 二次電池
605 整流回路
606 変調回路
607 電源回路
610 電源負荷部
700 給電装置
701 給電装置用アンテナ回路
702 信号処理回路
703 整流回路
704 変調回路
705 復調回路
706 発振回路
1301 モーターボート
1302 蓄電装置
1311 電気車椅子
1312 蓄電装置
Claims (11)
- 集電体と、
前記集電体上のシリコン及び金属元素を有する混合層と、
前記混合層上の活物質層として機能する結晶性シリコン層とを有し、
前記結晶性シリコン層は、結晶性シリコン領域と、前記結晶性シリコン領域上に突出する複数の突起を有するウィスカー状の結晶性シリコン領域とを有し、
前記ウィスカー状の結晶性シリコン領域は、屈曲した部位または枝分かれした部位を有する突起を有することを特徴とする蓄電装置。 - 請求項1において、前記ウィスカー状の結晶性シリコン領域が有する一の突起は、前記ウィスカー状の結晶性シリコン領域が有する他の突起と接する部分を有することを特徴とする蓄電装置。
- 請求項1または2において、前記ウィスカー状の結晶性シリコン領域が有する、前記屈曲した部位または前記枝分かれした部位を有する突起は、前記屈曲した部位または前記枝分かれした部位において、他の突起と接することを特徴とする蓄電装置。
- 請求項1乃至3のいずれか一項において、前記ウィスカー状の結晶性シリコン領域が有する前記複数の突起の軸の方向は、不揃いであることを特徴とする蓄電装置。
- 請求項1乃至4のいずれか一項において、前記集電体は、シリコンと反応してシリサイドを形成する金属元素を含んでいることを特徴とする蓄電装置。
- 請求項5において、前記シリコンと反応してシリサイドを形成する金属元素は、ジルコニウム、チタン、ハフニウム、バナジウム、ニオブ、タンタル、クロム、モリブデン、タングステン、コバルト、及びニッケルの一以上であることを特徴とする蓄電装置。
- 請求項1乃至6のいずれか一項において、前記混合層は、前記シリコン及び前記集電体に含まれる金属元素を有することを特徴とする蓄電装置。
- 請求項1乃至7のいずれか一項において、前記集電体は、箔状、板状、または網状であることを特徴とする蓄電装置。
- 請求項1乃至7のいずれか一項において、前記集電体は、基板上に膜状に形成されていることを特徴とする蓄電装置。
- 集電体上に、シリコンを含む堆積性ガスを原料ガスに用い、低圧化学蒸着法によりウィスカー状の結晶性シリコン領域を有する結晶性シリコン層を活物質層として形成し、
前記ウィスカー状の結晶性シリコン領域は、屈曲した部位または枝分かれした部位を有する突起を有することを特徴とする蓄電装置の作製方法。 - 請求項10において、前記低圧化学蒸着法は550℃より高い温度で行うことを特徴とする蓄電装置の作製方法。
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WO2011136028A1 (en) | 2010-04-28 | 2011-11-03 | Semiconductor Energy Laboratory Co., Ltd. | Power storage device and method for manufacturing the same |
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