JP2015210928A - 非水系二次電池用正極及び非水系二次電池 - Google Patents
非水系二次電池用正極及び非水系二次電池 Download PDFInfo
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- JP2015210928A JP2015210928A JP2014091341A JP2014091341A JP2015210928A JP 2015210928 A JP2015210928 A JP 2015210928A JP 2014091341 A JP2014091341 A JP 2014091341A JP 2014091341 A JP2014091341 A JP 2014091341A JP 2015210928 A JP2015210928 A JP 2015210928A
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- positive electrode
- active material
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- secondary battery
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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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
- 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
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
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- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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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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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
前記第2正極活物質の長尺部分の平均長さをL1とし、前記第2正極活物質の短幅部分の平均長さをL2としたときのL1/L2の比率をアスペクト比とした場合、前記アスペクト比は1.5以上であることを特徴とする。
a)工程
第1正極活物質としてのLiNi5/10Co2/10Mn3/10O2を準備した。このLiNi5/10Co2/10Mn3/10O2の2次粒子の平均粒子径(D50)は6μmであった。針形状のLiFePO4を、炭素材料で被覆した。LiFePO4と炭素材料の合計質量を100質量%としたときに、LiFePO4の配合比は、97質量%であった。
集電体として厚み20μmのアルミニウム箔を準備した。該アルミニウム箔の表面に、a)工程で製造した分散液をのせ、ドクターブレードを用いて該分散液が膜状になるように塗布した。分散液を塗布したアルミニウム箔を80℃で20分間乾燥することで、NMPを揮発により除去し、アルミニウム箔表面に正極活物質層を形成させた。
圧縮装置として、ロールプレス機(大野ロール株式会社)を用いた。圧縮装置にb)工程の正極活物質層が形成されたアルミニウム箔を配置した。圧縮装置を起動させ、正極活物質層を圧縮した。得られた正極を120℃で6時間、真空乾燥機で加熱し、所定の形状(40mm×80mmの矩形状)に切り取り、実施例1の正極とした。
本比較例1の正極は、球形状の第2正極活物質を用いている他は、実施例1と同様である。本比較例1の正極のSEM断面観察において、第2正極活物質の長尺部分の平均長さL1は2μmであり、短幅部分の平均長さL2は2μmであり、アスペクト比(L1/L2)は1であった。
実施例1、比較例1のリチウムイオン二次電池につき、以下の方法で釘刺し試験を行い、内部短絡時のリチウムイオン二次電池の電圧挙動を測定した。
本比較例2の正極では、正極活物質のすべてが、第1正極活物質としてのLiNi5/10Co2/10Mn3/10O2からなり、第2正極活物質は含んでいない。
Claims (8)
- 第1正極活物質と、前記第1正極活物質よりも充放電電位の低い第2正極活物質とを有する非水系二次電池用正極であって、
前記第2正極活物質の長尺部分の平均長さをL1とし、前記第2正極活物質の短幅部分の平均長さをL2としたときのL1/L2の比率をアスペクト比とした場合、前記アスペクト比は1.5以上であることを特徴とする非水系二次電池用正極。 - 前記第2正極活物質のアスペクト比は、3以上である請求項1記載の非水系二次電池用正極。
- 前記第2正極活物質の形状は、針形状である請求項1又は2に記載の非水系二次電池用正極。
- 前記第2正極活物質の前記長尺部分の平均長さL1は、0.1μm以上10μm以下である請求項1〜3のいずれか1項に記載の非水系二次電池用正極。
- 前記第1正極活物質は、二次粒子を形成してなり、
前記第1正極活物質の二次粒子の平均粒径をL3としたときに、前記第1正極活物質の二次粒子の平均粒径L3に対する前記第2正極活物質の前記長尺部分の平均長さL1の比率(L1/L3)は0.01以上10以下である請求項1〜4のいずれか1項に記載の非水系二次電池用正極。 - 前記第1正極活物質と前記第2正極活物質との合計質量を100質量%としたときに、前記第2正極活物質の配合比は、24.5質量%を超えて多く且つ35質量%以下である請求項1〜5のいずれか1項に記載の非水系二次電池用正極。
- 前記第1正極活物質は、一般式:LiaNibCocMndDeOf(0.2≦a≦1.7、b+c+d+e=1、0≦e<1、DはLi、Fe、Cr、Cu、Zn、Ca、Mg、Zr、S、Si、Na、K、Alから選ばれる少なくとも1の元素、1.7≦f≦2.1)で表される化合物であり、
前記第2正極活物質は、リチウムホスフェート系材料からなる請求項1〜6のいずれか1項に記載の非水系二次電池用正極。 - 請求項1〜7のいずれか1項に記載の非水系二次電池用正極を備えたことを特徴とする非水径二次電池。
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JP2017188312A (ja) * | 2016-04-06 | 2017-10-12 | 住友金属鉱山株式会社 | 非水系電解質二次電池用正極材料、該正極材料を用いた非水系電解質二次電池、および非水系電解質二次電池用正極材料の製造方法。 |
JP2018037380A (ja) * | 2016-09-02 | 2018-03-08 | 株式会社豊田自動織機 | 正極及びリチウムイオン二次電池 |
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US20220013789A1 (en) * | 2018-10-30 | 2022-01-13 | Panasonic Intellectual Property Management Co., Ltd. | Secondary battery |
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