JP2013105704A - 電極、非水電解質電池および電池パック - Google Patents
電極、非水電解質電池および電池パック Download PDFInfo
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- JP2013105704A JP2013105704A JP2011250549A JP2011250549A JP2013105704A JP 2013105704 A JP2013105704 A JP 2013105704A JP 2011250549 A JP2011250549 A JP 2011250549A JP 2011250549 A JP2011250549 A JP 2011250549A JP 2013105704 A JP2013105704 A JP 2013105704A
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Images
Classifications
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- 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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
【課題】入出力特性が改善された電極、非水電解質電池及び電池パックを提供する。
【解決手段】実施形態によれば、集電体と、集電体に形成された活物質含有層とを含む電極が提供される。活物質は、Li吸蔵電位が0.4V(vs.Li/Li+)以上である。水銀圧入法による細孔径分布に、0.01μm以上0.1μm以下のモード径を有する第1のピークと、0.2μmを超え、かつ1μm以下のモード径を有する第2のピークとを有する。水銀圧入法による細孔の体積が電極重量(集電体の重量を除く)1g当り0.1mL以上0.3mL以下である。
【選択図】図1
Description
を含む非水電解質電池が提供される。
第1の実施形態によると、集電体と、集電体に形成された活物質含有層とを含む電極が提供される。活物質含有層は、集電体の片面もしくは両面に形成されることが可能である。活物質含有層に含まれる活物質は、Li吸蔵電位が0.4V(vs.Li/Li+)以上である。水銀圧入法による細孔径分布に、0.01μm以上0.1μm以下のモード径を有する第1のピークと、0.2μmを超え、かつ1μm以下のモード径を有する第2のピークとを有する。水銀圧入法による細孔の体積が、電極の重量(集電体の重量を除く)1g当り0.1mL以上0.3mL以下である。
第2の実施形態によれば、正極と、負極として第1の実施形態に係る電極と、非水電解質とを含む非水電解質電池を提供することができる。
この正極は、正極集電体と、前記正極集電体の片面もしくは両面に担持され、活物質及び結着剤を含む正極活物質含有層とを有する。
セパレータには多孔質セパレータを用いる。多孔質セパレータとしては、例えば、ポリエチレン、ポリプロピレン、セルロース、またはポリフッ化ビニリデン(PVdF)を含む多孔質フィルム、合成樹脂製不織布等を挙げることができる。中でも、ポリエチレンか、あるいはポリプロピレン、または両者からなる多孔質フィルムは、二次電池の安全性を向上できるため、好ましい。
この非水電解質には、液状非水電解質を使用することができる。
外装部材としては、板厚0.5mm以下の金属製容器や、板厚0.2mm以下のラミネートフィルム製容器を用いることができる。金属製容器には、アルミニウム、アルミニウム合金、鉄、ステンレスなどからなる金属缶で角形、円筒形の形状のものが使用できる。金属製容器の板厚は0.2mm以下にすることがより望ましい。
負極端子は、リチウムイオン金属に対する電位が0.4V以上3V以下の範囲における電気的安定性と導電性とを備える材料から形成することができる。具体的には、Mg、Ti、Zn、Mn、Fe、Cu、Si等の元素を含むアルミニウム合金、アルミニウムが挙げられる。接触抵抗を低減するために、負極集電体と同様の材料が好ましい。
正極端子は、リチウムイオン金属に対する電位が3V以上5V以下の範囲における電気的安定性と導電性とを備える材料から形成することができる。具体的には、Mg、Ti、Zn、Mn、Fe、Cu、Si等の元素を含むアルミニウム合金、アルミニウムが挙げられる。接触抵抗を低減するために、正極集電体と同様の材料が好ましい。
第3の実施形態に係る電池パックは、第2の実施形態に係る非水電解質電池を1または複数有する。第2の実施形態に係る非水電解質電池を単電池とし、単電池を電気的に直列もしくは並列に接続し、組電池を構成することが望ましい。
<負極の作製>
負極活物質として、単独の一次粒子と、一次粒子が凝集した二次粒子とを含み、一次粒子径が1.0μmで、二次粒子径が15μmで、平均Li吸蔵電位が1.6V(vs.Li/Li+)で、N2吸着によるBET法での比表面積が20m2/gのTiO2(B)を用意した。負極活物質の粒径は、レーザー回折式粒度分布測定器(日機装マイクロトラックMT3000)により測定した。
ここで、Pは加える圧力、Dは細孔直径、γは水銀の表面張力(480dyne・cm-1)、は水銀と細孔壁面の接触角で140°である。γ、θは定数であるからWashbμrnの式より、加えた圧力Pと細孔径Dの関係が求められ、そのときの水銀浸入容積を測定することにより、細孔径とその容積分布を導くことができる。測定法・原理等の詳細は、神保元二ら「微粒子ハンドブック」朝倉書店、(1991)、早川宗八郎編:「粉体物性測定法」朝倉書店(1978)などを参照されたい。
レート特性は以下に説明する方法で3極式セルを作製し測定した。
3c…空隙、4…負極、4a…負極集電体、4b…負極活物質含有層、4c…空隙、5…
セパレータ、6…正極端子、7…負極端子、P1…正極材料、P2…負極材料、21…単電池、22…組電池、23…粘着テープ、24…プリント配線基板、25…サーミスタ、26…保護回路、27…通電用端子、28…正極側配線、29…正極側コネクタ、30…負極側配線、31…負極側コネクタ、31a,31b,32…配線、33…保護ブロック、35…収納容器、36…蓋。
Claims (6)
- 集電体と、前記集電体に形成された活物質含有層とを含む電極であって、
前記活物質含有層の前記活物質は、Li吸蔵電位が0.4V(vs.Li/Li+)以上であり、
水銀圧入法による細孔径分布に、0.01μm以上0.1μm以下のモード径を有する第1のピークと、0.2μmを超え、かつ1μm以下のモード径を有する第2のピークとを有し、
水銀圧入法による細孔の体積が前記電極の重量(前記集電体の重量を除く)1g当り0.1mL以上0.3mL以下であることを特徴とする電極。 - 前記活物質は、単斜晶系β型構造を有するチタン複合酸化物を含むことを特徴とする請求項1記載の電極。
- 前記単斜晶系β型構造を有するチタン複合酸化物のBET法による比表面積は1m2/g以上30m2/g以下であることを特徴とする請求項2記載の電極。
- 前記電極の密度は1.9g/cm3以上2.1g/cm3未満であること特徴とする請求項1〜3いずれか1項記載の電極。
- 正極と、
負極として請求項1〜4いずれか1項記載の電極と、
非水電解質と
を含むことを特徴とする非水電解質電池。 - 請求項5記載の非水電解質電池を含むことを特徴とする電池パック。
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CN201210382094.4A CN103117376B (zh) | 2011-11-16 | 2012-08-31 | 电极、非水电解质电池以及电池包 |
US13/679,182 US9231248B2 (en) | 2011-11-16 | 2012-11-16 | Electrode, nonaqueous electrolyte battery, and battery pack |
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JP2017059394A (ja) * | 2015-09-16 | 2017-03-23 | 株式会社東芝 | 非水電解質電池用電極、非水電解質電池、電池パック及び自動車 |
WO2022137516A1 (ja) | 2020-12-25 | 2022-06-30 | 株式会社 東芝 | 電極、電池、及び電池パック |
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JP6193285B2 (ja) * | 2015-03-19 | 2017-09-06 | 株式会社東芝 | リチウムイオン二次電池用負極、リチウムイオン二次電池、電池パック及び車 |
JP6573150B2 (ja) * | 2015-03-20 | 2019-09-11 | 株式会社Gsユアサ | 蓄電素子 |
US10868299B2 (en) * | 2016-10-31 | 2020-12-15 | Panasonic Intellectual Property Management Co., Ltd. | Non-aqueous electrolyte secondary battery |
CN110291665B (zh) * | 2017-02-21 | 2022-07-05 | 日本碍子株式会社 | 锂复合氧化物烧结体板 |
JP7080584B2 (ja) | 2017-03-17 | 2022-06-06 | 株式会社東芝 | 二次電池、電池パック、および車両 |
KR102651696B1 (ko) * | 2020-10-19 | 2024-03-26 | 에스케이온 주식회사 | 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지 |
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JP2008243729A (ja) * | 2007-03-28 | 2008-10-09 | Toshiba Corp | 非水電解質電池、電池パック及び自動車 |
JP2009158396A (ja) * | 2007-12-27 | 2009-07-16 | Toshiba Corp | 非水電解質電池 |
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JP2008243729A (ja) * | 2007-03-28 | 2008-10-09 | Toshiba Corp | 非水電解質電池、電池パック及び自動車 |
JP2009158396A (ja) * | 2007-12-27 | 2009-07-16 | Toshiba Corp | 非水電解質電池 |
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