JP2005196970A - 非水電解質二次電池用負極とその製造方法ならびにそれを用いた非水電解質二次電池 - Google Patents
非水電解質二次電池用負極とその製造方法ならびにそれを用いた非水電解質二次電池 Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
【解決手段】 リチウムを可逆的に吸蔵および放出できる非水電解質二次電池用負極であって、集電体(2)と、集電体(2)上に配置された薄膜状の負極材料(3)とを含み、負極材料(3)は、リチウム吸蔵性を有する元素を含む結晶粒(4)を含み、結晶粒(4)の長軸方向が、薄膜状の負極材料(3)の主面に垂直な面に対して傾斜していることを特徴とする負極(1)とする。
【選択図】 図2
Description
(i)集電体上にリチウム吸蔵性を有する元素を配置することによって、前記元素を含む結晶粒を含む薄膜状の負極材料を前記集電体上に形成する工程を含み、
前記工程(i)において、前記元素を前記集電体の主面に垂直な方向から角度ωだけ傾けて前記集電体の主面に入射することによって、前記結晶粒の長軸方向が前記薄膜状の負極材料の主面に垂直な面に対して傾斜するように前記元素を配置することを特徴としている。
(i)集電体上にリチウム吸蔵性を有する元素を配置することによって、上記元素を含む結晶粒を含む薄膜状の負極材料を集電体上に形成する工程を含むことを特徴としている。また、上記工程(i)において、上記元素を集電体の主面に垂直な方向から角度ωだけ傾けて集電体の主面に入射することによって、結晶粒の長軸方向が薄膜状の負極材料の主面に(集電体の主面に)垂直な面に対して傾斜するように上記元素を配置することを特徴としている。
実施例1では、真空蒸着法によって、薄膜状の負極材料を集電体上に形成した負極を作製した後に、上記負極を用いて電池を作製し、その特性を評価した。最初に、負極の作製方法を述べる。
実施例2では、実施例1と同様にして負極を作製した。ただし、実施例1とは異なり、集電体の表面の平均表面粗さRaと、負極作製時における角度ωとを各サンプル間で変化させた。その他の負極の構成、製造方法などは実施例1と同様とした。実施例2では、実施例としてRaと角度ωとを変化させたサンプルを12種類(サンプル5〜サンプル16)準備し、比較例としてRaのみを変化させた(角度ω=0°)サンプルを4種類(実施例1におけるサンプルA、サンプルB〜サンプルD)準備した。
実施例3では、真空蒸着法によって、薄膜状の負極材料を集電体上に形成した負極を作製した後に、上記負極を用いて電池を作製し、その特性を評価した。最初に、負極の作製方法を述べる。
実施例4では、実施例3と同様にして負極を作製した。ただし、実施例3とは異なり、集電体の表面の平均表面粗さRaと、負極作製時における角度ω1およびω2とを各サンプル間で変化させた。その他の負極の構成、製造方法などは実施例3と同様とした。実施例4では、実施例としてRaと角度ω1およびω2とを変化させたサンプルを15種類(サンプル22〜サンプル36)準備し、比較例としてRaのみを変化させた(角度ω1およびω2を0°に固定)サンプルを5種類(実施例3におけるサンプルE、サンプルF〜サンプルI)準備した。
2 集電体
3 負極材料
4 結晶粒
5 下地層
11 電池
12 セパレータ
13 正極
14 電池ケース
15 封口板
16 絶縁ガスケット
17 タブ
21 巻出しロール
22 マスク
23、23a、23b ターゲット
24a、24b 成膜ロール
25 巻取りロール
26 真空容器
27 真空ポンプ
Claims (14)
- リチウムを可逆的に吸蔵および放出できる非水電解質二次電池用負極であって、
集電体と、前記集電体上に配置された薄膜状の負極材料とを含み、
前記負極材料は、リチウム吸蔵性を有する元素を含む結晶粒を含み、
前記結晶粒の長軸方向が、前記薄膜状の負極材料の主面に垂直な面に対して傾斜していることを特徴とする非水電解質二次電池用負極。 - 前記長軸方向と前記垂直な面とが成す角度θが、10°〜50°の範囲である請求項1に記載の非水電解質二次電池用負極。
- 前記結晶粒が、略柱状である請求項1に記載の非水電解質二次電池用負極。
- 前記結晶粒が一定方向に湾曲している請求項3に記載の非水電解質二次電池用負極。
- 前記元素がケイ素である請求項1に記載の非水電解質二次電池用負極。
- 前記集電体と前記負極材料との間に、下地層がさらに配置されている請求項1に記載の非水電解質二次電池用負極。
- 前記集電体の表面および前記下地層の表面から選ばれる少なくとも1つの表面におけるJIS B 0601(1994)に規定の平均表面粗さRaが、0.01μm〜1μmの範囲である請求項1〜6のいずれかに記載の非水電解質二次電池用負極。
- 請求項1〜7のいずれかに記載の非水電解質二次電池用負極と、リチウムを可逆的に吸蔵および放出できる正極と、リチウム伝導性を有する電解質とを含む非水電解質二次電池。
- リチウム吸蔵性を有する元素を含む結晶粒を含んだ薄膜状の負極材料と集電体とを含み、前記負極材料が前記集電体上に配置された非水電解質二次電池用負極の製造方法であって、
(i)集電体上にリチウム吸蔵性を有する元素を配置することによって、前記元素を含む結晶粒を含む薄膜状の負極材料を前記集電体上に形成する工程を含み、
前記工程(i)において、前記元素を前記集電体の主面に垂直な方向から角度ωだけ傾けて前記集電体の主面に入射することによって、前記結晶粒の長軸方向が前記薄膜状の負極材料の主面に垂直な面に対して傾斜するように前記元素を配置することを特徴とする非水電解質二次電池用負極の製造方法。 - 前記角度ωが、20°〜67°の範囲である請求項9に記載の非水電解質二次電池用負極の製造方法。
- 前記工程(i)において、前記角度ωを増加させながら前記元素を配置する請求項11に記載の非水電解質二次電池用負極の製造方法。
- 前記工程(i)が、CVD法(化学気相反応法)、スパッタリング法および真空蒸着法から選ばれる少なくとも1つの方法によって行われる請求項9に記載の非水電解質二次電池用負極の製造方法。
- 前記元素がSiである請求項9に記載の非水電解質二次電池用負極の製造方法。
- 前記工程(i)の前に、
(a)前記集電体上に下地層を形成する工程を含む請求項9に記載の非水電解質二次電池用負極の製造方法。
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Cited By (58)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060275662A1 (en) * | 2005-06-01 | 2006-12-07 | Takakazu Hirose | Anode for secondary battery, secondary battery, and method of manufacturing anode for secondary battery |
WO2007015419A1 (ja) | 2005-08-02 | 2007-02-08 | Matsushita Electric Industrial Co., Ltd. | リチウム二次電池用負極およびその製造方法 |
WO2007046322A1 (ja) * | 2005-10-21 | 2007-04-26 | Matsushita Electric Industrial Co., Ltd. | 電池 |
WO2007052803A1 (ja) | 2005-11-07 | 2007-05-10 | Matsushita Electric Industrial Co., Ltd. | リチウム二次電池用電極、リチウム二次電池およびその製造法 |
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