JP2009076468A - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
- Publication number
- JP2009076468A JP2009076468A JP2008306569A JP2008306569A JP2009076468A JP 2009076468 A JP2009076468 A JP 2009076468A JP 2008306569 A JP2008306569 A JP 2008306569A JP 2008306569 A JP2008306569 A JP 2008306569A JP 2009076468 A JP2009076468 A JP 2009076468A
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- JP
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- Prior art keywords
- lithium
- negative electrode
- composite oxide
- positive electrode
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 239000002131 composite material Substances 0.000 claims abstract description 50
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- 239000007774 positive electrode material Substances 0.000 claims abstract description 17
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- 229910052744 lithium Inorganic materials 0.000 claims abstract description 15
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 13
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 13
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- SWAIALBIBWIKKQ-UHFFFAOYSA-N lithium titanium Chemical compound [Li].[Ti] SWAIALBIBWIKKQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 5
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- 229910008365 Li-Sn Inorganic materials 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910016243 LiMn1.5Ni0.45Mg0.05O4 Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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Images
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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- H01M10/0569—Liquid materials characterised by the solvents
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- 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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- H01—ELECTRIC ELEMENTS
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- 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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- 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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- 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
- H01M4/52—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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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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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
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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
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- Inorganic Chemistry (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
【解決手段】外装材と、EC又はPCとDECとを含み、DECの含有量が80〜95vol%である非水溶媒、非水溶媒に溶解する電解質としてLiBF4またはLiPF6を含む非水電解質と、満充電状態での正極電位が金属リチウムの電位に対して4.4Vよりも貴となる、リチウムコバルト酸化物、リチウムマンガン複合酸化物、リチウムニッケル複合酸化物、リチウムニッケル複合酸化物、リチウムマンガンコバルト複合酸化物、オリビン構造を有するリチウムリン酸化物から選ばれる正極活物質を有する正極と、負極活物質としてリチウムチタン複合酸化物、リチウム鉄複合硫化物、リチウムタングステン複合酸化物、リチウムモリブデン複合酸化物およびリチウムチタン複合硫化物のいずれかを有する負極と、セパレータとを具備する非水電解質二次電池。
【選択図】図1
Description
1)非水電解質
非水電解質は、電解質を非水溶媒に溶解し調製される液状非水電解質、液状電解質と高分子材料を複合化したゲル状非水電解質等が挙げられる。
正極は、正極集電体と、正極集電体の片面若しくは両面に担持され、正極活物質、正極導電剤及び結着剤を含む正極層とを有する。
負極は、負極集電体と、負極集電体の片面若しくは両面に担持され、負極活物質、負極導電剤および結着剤を含む負極層とを有する。
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、ポリエチレン又はポリプロピレンからなる多孔質フィルムは、一定温度において溶融し、電流を遮断することが可能であり、安全性向上の観点から好ましい。
外装材としては、肉厚0.2mm以下のラミネートフィルムや、肉厚0.5mm以下の金属製容器が挙げられる。肉厚0.2mm以下であるとより好ましい。形状としては、扁平型、角型、円筒型、コイン型、ボタン型、シート型、積層型等が挙げられる。なお、無論、携帯用電子機器等に積載される小型電池の他、二輪乃至四輪の自動車等に積載される大型電池でも良い。
<正極の作製>
正極活物質としてリチウムマンガンニッケル酸化物(LiMn1.5Ni0.45Mg0.05O4)と、正極導電剤として1200℃で焼成したコークス(d002=0.347、平均粒径5μm)と、結着剤としてポリフッ化ビニリデン(PVdF)と、を重量比90:5:5となるようにN−メチルピロリドン(NMP)溶液に加えて混合し、得られたスラリーを厚さ15μmのアルミニウム箔からなる正極集電体の両面に塗布した後、乾燥し、プレスし、電極密度が2.8g/cm3の正極を作製した。
負極活物質としてリチウムチタン複合酸化物(Li4Ti5O12)と、負極導電剤として1200℃で焼成したコークス(d002=0.347、平均粒径5μm)と、結着剤としてポリフッ化ビニリデン(PVdF)と、を重量比90:5:5となるようにN−メチルピロリドン(NMP)溶液に加えて混合し、得られたスラリーを厚さ15μmのアルミニウム箔からなる負極集電体の両面に塗布した後、乾燥し、プレスし、電極密度が2.4g/cm3の負極を作製した。
正極、厚さ25μmのポリエチレン製の多孔質フィルムからなるセパレータ、負極、セパレータの順に積層した後、渦巻き状に捲回した。これを約90℃で加熱プレスすることにより、幅30mm、厚さ3.0mmの偏平状電極群を作製した。得られた電極群を、厚さ0.1mmのラミネートフィルムからなるパックに収納し、約80℃で24時間真空乾燥を施した。
下記表1に示す非水溶媒に、表1に示す電解質を溶解させ、液状非水電解質を調製した。
電極群を収納したラミネートフィルムパック内に液状非水電解質を注入した後、パックをヒートシールにより完全密閉し、前述した図1に示す構造を有し、幅が35mm、厚さ3.2mm、高さ65mmの非水電解質二次電池を作製した。
負極活物質としてリチウムチタン複合硫化物(FeS)を用い、非水電解質を表2に示すように調製する他は、実施例A1と同様の非水電解質二次電池を作製した。
2 負極端子
3 正極
3a 正極集電体
3b 正極層
4 負極
4a 負極集電体
4b 負極層
5 セパレータ
6 捲回電極
7 外装材
Claims (4)
- 外装材と、
前記外装材内に充填され、エチレンカーボネート若しくはプロピレンカーボネートとジエチルカーボネートとを含み、前記ジエチルカーボネートの含有量が80体積%以上95体積%以下である非水溶媒、前記非水溶媒に溶解する電解質としてLiBF4またはLiPF6、を含む非水電解質と、
前記外装材内に収納され、満充電状態での正極電位が金属リチウムの電位に対して4.4Vよりも貴となる、リチウムコバルト酸化物、リチウムマンガン複合酸化物、リチウムニッケル複合酸化物、リチウムニッケル複合酸化物、リチウムマンガンコバルト複合酸化物、オリビン構造を有するリチウムリン酸化物から選ばれる少なくとも1種を正極活物質として有する正極と、
前記外装材内に収納され、負極活物質としてリチウムチタン複合酸化物、リチウム鉄複合硫化物、リチウムタングステン複合酸化物、リチウムモリブデン複合酸化物およびリチウムチタン複合硫化物の群から選択される少なくとも1つの複合酸化物または複合硫化物を有する負極と、
前記負極と前記正極とに挟まれ、前記非水電解質を含浸したセパレータとを具備することを特徴とする非水電解質二次電池。 - 前記非水電解質は、前記非水溶媒に溶解され、Li(CF3SO2)2N、Li(CF3SO2)(C2F5SO2)N及びLi(C2F5SO2)2Nから選ばれるイミド系リチウム塩を含むことを特徴とする請求項1に記載の非水電解質二次電池。
- 前記電解質の全含有量に対する前記イミド系リチウム塩の含有量は2モル%以上50モル%以下であることを特徴とする請求項2に記載の非水電解質二次電池。
- 前記負極は、負極集電体と、前記負極集電体の片面もしくは両面に厚さ10μm以上60μm以下で形成され、前記負極活物質、負極導電剤及び結着剤からなる負極層と、を具備することを特徴とする請求項1乃至3のいずれか1項に記載の非水電解質二次電池。
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Also Published As
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JP2006066341A (ja) | 2006-03-09 |
KR100772751B1 (ko) | 2007-11-01 |
KR20060050745A (ko) | 2006-05-19 |
JP4245532B2 (ja) | 2009-03-25 |
JP5286054B2 (ja) | 2013-09-11 |
US20060046155A1 (en) | 2006-03-02 |
US7601463B2 (en) | 2009-10-13 |
CN100377416C (zh) | 2008-03-26 |
CN1744368A (zh) | 2006-03-08 |
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