JP5365873B2 - 電極および電池 - Google Patents
電極および電池 Download PDFInfo
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- JP5365873B2 JP5365873B2 JP2010025789A JP2010025789A JP5365873B2 JP 5365873 B2 JP5365873 B2 JP 5365873B2 JP 2010025789 A JP2010025789 A JP 2010025789A JP 2010025789 A JP2010025789 A JP 2010025789A JP 5365873 B2 JP5365873 B2 JP 5365873B2
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- -1 chain carbonate ester Chemical class 0.000 claims description 24
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- WDAXFOBOLVPGLV-UHFFFAOYSA-N isobutyric acid ethyl ester Natural products CCOC(=O)C(C)C WDAXFOBOLVPGLV-UHFFFAOYSA-N 0.000 description 1
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- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
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- LGRLWUINFJPLSH-UHFFFAOYSA-N methanide Chemical compound [CH3-] LGRLWUINFJPLSH-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- NCKZHFSVCRZQGH-UHFFFAOYSA-N methylsulfinylmethane;phosphoric acid Chemical compound CS(C)=O.OP(O)(O)=O NCKZHFSVCRZQGH-UHFFFAOYSA-N 0.000 description 1
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- MPDOUGUGIVBSGZ-UHFFFAOYSA-N n-(cyclobutylmethyl)-3-(trifluoromethyl)aniline Chemical compound FC(F)(F)C1=CC=CC(NCC2CCC2)=C1 MPDOUGUGIVBSGZ-UHFFFAOYSA-N 0.000 description 1
- UUIQMZJEGPQKFD-UHFFFAOYSA-N n-butyric acid methyl ester Natural products CCCC(=O)OC UUIQMZJEGPQKFD-UHFFFAOYSA-N 0.000 description 1
- MCSAJNNLRCFZED-UHFFFAOYSA-N nitroethane Chemical compound CC[N+]([O-])=O MCSAJNNLRCFZED-UHFFFAOYSA-N 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Cell Electrode Carriers And Collectors (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Vapor Deposition ;化学気相成長)法などが挙げられる。液相法としては例えば鍍金が挙げられる。
本実施例では、上記実施の形態に対応した二次電池を作製した。
整した。
被覆領域22Aのマット面の表面粗さRz値を全て7.4μmとしつつ、シャイン面の表面粗さRz値を以下に示す表2のように変化させたことを除き、他は実施例1−5と同様にして実施例2−1〜2−6の二次電池を作製した。さらに、実施例2−1〜2−6に対する比較例2−1として、負極活物質層23を形成する前に負極集電体22の全面に亘ってプレス成型を行い、被覆領域22Aのシャイン面の表面粗さRz値についても1.7μmとしたことを除き、他は実施例2−1〜2−6と同様にして二次電池を作製した。これらの実施例2−1〜2−6および比較例2−1についても、実施例1−1〜1−8と同様にして放電容量維持率および抵抗の測定を行った。その結果を、実施例1−5および比較例1−1の結果と共に表2に示す。
露出領域22Sの表面粗さRz値を以下に示す表3のように変化させたことを除き、他は実施例1−5と同様にして実施例3−1〜3−3の二次電池を作製した。これらの実施例3−1〜3−3についても、実施例1−5と同様にして放電容量維持率および抵抗の測定を行った。その結果を、実施例1−5の結果と共に表3に示す。
露出領域22Sの平坦化を行う際、負極活物質層23についても一括してプレス成型したことを除き、他は実施例1−5と同様にして実施例4−1の二次電池を作製した。これらの実施例4−1についても、実施例1−5と同様にして放電容量維持率および抵抗の測定を行った。その結果を、実施例1−5の結果と共に表4に示す。
負極活物質層23に含まれる導電性粒子としてのケイ素粒子の平均粒子径を以下に示す表5のように変化させたことを除き、他は実施例1−5と同様にして実施例5−1〜5−5の二次電池を作製した。これらの実施例5−1〜5−5についても、実施例1−5と同様にして放電容量維持率および抵抗の測定を行った。その結果を、実施例1−5の結果と共に表5に示す。
負極活物質層23に含まれる結着材の種類をポリアミドイミド(実施例6−1)およびポリフッ化ビニリデン(実施例6−2)としたことを除き、他は実施例1−5と同様にして実施例6−1および6−2の二次電池を作製した。なお、実施例1−5では、上述したように、熱可塑性のポリイミドを使用した。また、表面粗さRz値が全面に亘って1.7μmである電解銅箔(厚み12μm)を負極集電体として用いたことを除き、他は実施例6−1,6−2および1−5とそれぞれ同様にして比較例6−1〜6−3としての二次電池を作製した。これらの実施例6−1および6−2、ならびに比較例6−1〜6−3についても、実施例1−5と同様にして放電容量維持率の測定を行った。その結果を、実施例1−5の結果と共に表6に示す。
巻回電極体30を作製する前に、負極20を減圧雰囲気において熱処理を行うようにしたことを除き、他は実施例1−5と同様にして実施例7−1〜7−5の二次電池を作製した。熱処理条件、すなわち、加熱温度(℃)および加熱時間(h)については以下の表7に示した通りである。なお、作成した負極20について断面を切り出し、負極集電体22と負極活物質層23との界面をAES(オージェ電子分光法;Auger electron spectroscopy )により分析を行ったところ、負極活物質層23に負極集電体22の銅の成分が拡散されていることが確認された。すなわち、負極集電体22と負極活物質層23とが合金化していることが確認された。これらの実施例7−1〜7−5についても、実施例1−5と同様にして放電容量維持率および抵抗の測定を行った。その結果を、実施例1−5の結果と共に表7に示す。
電解質に用いる溶媒として、炭酸エチレンの代わりにフルオロエチレンカーボネート(FEC)またはジフルオロエチレンカーボネート(DFEC)を用いたことを除き、他は実施例1−5と同様にして実施例8−1および8−2の二次電池を作製した。また、表面粗さRz値が全面に亘って1.7μmである電解銅箔(厚み12μm)を負極集電体として用いたことを除き、他は実施例8−1,8−2および1−5とそれぞれ同様にして比較例8−1〜8−3としての二次電池を作製した。これらの実施例8−1および8−2、ならびに比較例8−1〜8−3についても、実施例1−5と同様にして放電容量維持率の測定を行った。その結果を、実施例1−5の結果と共に表8に示す。
負極活物質層23を気相法により形成したことを除き、他は実施例1−5と同様にして実施例9−1の二次電池を作製した。また、実施例9−1に対する比較例9−1として、露出領域22Sをロールプレス機でプレス成型せずに、表面粗さの大きな状態のまま負極リード21を溶接したことを除き、他は実施例9−1と同様にして二次電池を作製した。また、比較例9−2として、負極活物質層23を形成する前に負極集電体22の全面に亘ってプレス成型を行い、被覆領域22Aの両面の表面粗さRz値をも1.7μmとしたことを除き、他は実施例9−1と同様にして二次電池を作製した。これらの実施例9−1および比較例9−1,9−2についても、実施例1−5と同様にして放電容量維持率および抵抗の測定を行った。その結果を表9に示す。
Claims (26)
- 基材上に粒子状の第1の突起部を有する活物質層形成領域、および前記基材上に電解析出法によって形成された粒子がプレス成型により塑性変形し平坦化された平滑領域を含む集電体と、
前記集電体の活物質層形成領域に設けられた活物質層と
を備え、
前記平滑領域に電極リードが接続されている電極。 - 前記活物質層形成領域における10点平均粗さRz値は、1.8μm以上10.0μm以下であり、
前記平滑領域における10点平均粗さRz値は、1.7μm以下である
請求項1に記載の電極。 - 前記平滑領域は、前記基材上に前記第1の突起部よりも高さの低い粒子状の第2の突起部を有し、
前記平滑領域における第2の突起部は、プレス成型により前記粒子が塑性変形したものである
請求項1または請求項2に記載の電極。 - 前記第1の突起部は、電解析出法によって形成されたものである
請求項1から請求項3のいずれか1項に記載の電極。 - 前記電極リードはニッケル(Ni)を含む金属材料からなる請求項1記載の電極。
- 前記集電体は銅(Cu)または銅合金を含んでおり、前記活物質層はケイ素(Si)を含んでいる
請求項1記載の電極。 - 前記活物質層は前記集電体の両面に形成されている請求項1記載の電極。
- 前記集電体と前記活物質層とは、界面の少なくとも一部において合金化している請求項1記載の電極。
- 前記活物質層は、ケイ素を含む導電性粒子と結着材との混合物を含む
請求項1記載の電極。 - 前記活物質層における導電性粒子の平均粒子径は、0.5μm以上5.0μm以下である
請求項9記載の電極。 - 前記活物質層は、前記結着材として、熱可塑性樹脂および熱硬化性樹脂のうちの少なくとも一方を含む
請求項9記載の電極。 - 前記活物質層は、前記結着材として、水素結合性を有する熱可塑性樹脂と、エポキシ樹脂,フェノール樹脂,ポリイミド,ポリウレタン,メラミン樹脂,ウレア樹脂からなる群のうちの少なくとも1種の熱硬化性樹脂とを含む
請求項9記載の電極。 - 正極および負極と共に電解質を備えた電池であって、
前記正極および負極のうちの少なくとも一方は、
基材上に粒子状の第1の突起部を有する活物質層形成領域、および前記基材上に電解析出法によって形成された粒子がプレス成型により塑性変形し平坦化された平滑領域を含む集電体と、
前記集電体の活物質層形成領域に設けられた活物質層と
を備え、
前記平滑領域に電極リードが接続される
電池。 - 前記活物質層形成領域における10点平均粗さRz値は、1.8μm以上10.0μm以下であり、
前記平滑領域における10点平均粗さRz値は、1.7μm以下である
請求項13に記載の電池。 - 前記平滑領域は、前記基材上に前記第1の突起部よりも高さの低い粒子状の第2の突起部を有し、
前記平滑領域における第2の突起部は、プレス成型により前記粒子が塑性変形したものである
請求項13または請求項14に記載の電池。 - 前記第1の突起部は、電解析出法によって形成されたものである
請求項13から請求項15のいずれか1項に記載の電池。 - 前記電極リードはニッケル(Ni)を含む金属材料からなる
請求項13記載の電池。 - 前記集電体は銅(Cu)または銅合金を含んでおり、前記活物質層はケイ素(Si)を含んでいる請求項13記載の電池。
- 前記活物質層は前記集電体の両面に形成されている請求項13記載の電池。
- 前記集電体と前記活物質層とは、界面の少なくとも一部において合金化している
請求項13記載の電池。 - 前記活物質層は、ケイ素を含む導電性粒子と結着材との混合物を含む
請求項13記載の電池。 - 前記活物質層における導電性粒子の平均粒子径は、0.5μm以上5.0μm以下である
請求項21記載の電池。 - 前記活物質層は、前記結着材として、熱可塑性樹脂および熱硬化性樹脂のうちの少なくとも一方を含む
請求項21記載の電池。 - 前記活物質層は、前記結着材として、水素結合性を有する熱可塑性樹脂と、エポキシ樹脂,フェノール樹脂,ポリイミド,ポリウレタン,メラミン樹脂,ウレア樹脂からなる群のうちの少なくとも1種の熱硬化性樹脂とを含む
請求項21記載の電池。 - 前記電解質は、鎖状炭酸エステルおよび環状炭酸エステルのうちの少なくとも1種を含む溶媒を有する
請求項13記載の電池。 - 前記鎖状炭酸エステルは、炭酸フルオロメチルメチル、炭酸ビス(フルオロメチル)および炭酸ジフルオロメチルメチルのうちの少なくとも1種を含み、
前記環状炭酸エステルは、4−フルオロ−1,3−ジオキソラン−2−オンおよび4,5−ジフルオロ−1,3−ジオキソラン−2−オンのうちの少なくとも1種を含む
請求項25記載の電池。
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