JP2011113826A - 扁平形非水二次電池 - Google Patents
扁平形非水二次電池 Download PDFInfo
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- 239000011255 nonaqueous electrolyte Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 54
- 239000003795 chemical substances by application Substances 0.000 claims description 17
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- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 2
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- 238000001035 drying Methods 0.000 description 1
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- 239000003273 ketjen black Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
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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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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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Abstract
【解決手段】 外装ケースと封口ケースとが絶縁ガスケットを介してカシメ封口されて形成された空間内に、複数の正極と複数の負極とをセパレータを介して積層した電極群および非水電解液を有している扁平形非水二次電池であって、正極は、本体部と、本体部から突出した、本体部よりも幅の狭い集電タブ部とを有しており、両側が負極と対向する正極の両面には、正極の本体部を覆う主体部と正極の集電タブ部の一部を覆う張り出し部とを有し、方向Aの熱収縮率が、方向Aに直交する方向Bの熱収縮率よりも大きなセパレータが、方向Bが正極の集電タブ部が本体部から突出する方向に略平行となるように配置されていて、前記2枚のセパレータが、主体部の周縁部の少なくとも一部において、互いに直接溶着された接合部を有している扁平形非水二次電池により、前記課題を解決する。
【選択図】 図4
Description
熱収縮率(%) = 100×(投入前寸法−投入後寸法)/(投入前寸法)
<正極の作製>
正極活物質としてLiCoO2を、導電助剤としてカーボンブラックを、バインダとしてPVDFを、それぞれ用いて正極を作製した。まず、LiCoO2:93部とカーボンブラック:3部とを混合し、得られた混合物とPVDF:4部を予めN−メチル−2−ピロリドン(NMP)に溶解させておいたバインダ溶液とを混合して正極合剤含有ペーストを調製した。得られた正極合剤含有ペーストを厚さ15μmのアルミニウム箔からなる正極集電体の両面にアプリケータにより塗布した。なお、正極合剤含有ペーストの塗布に際しては、塗布部と未塗布部とが5cmおきに連続するように、かつ表面で塗布部とした箇所は、裏面でも塗布部となるようにした。続いて、塗布した正極合剤含有ペーストを乾燥して正極合剤層を形成し、その後、ロールプレスし、所定の大きさに切断して、帯状の正極を得た。なお、この正極は、幅を40mmとし、正極合剤層形成部の厚みを140μmとなるようにした。
PE製微多孔膜セパレータ(厚み16μm、方向Aにおける熱収縮率Caが4%、方向Bにおける熱収縮率Cbが2%で、Ca/Cb=2)を、図4および図5に示す形状(図5中iの長さが5mm、iiの長さが0.8mm)で、方向Bが、張り出し部が主体部から突出する方向に平行となるように切り出した。
負極活物質として黒鉛を、バインダとしてPVDFを、それぞれ用いて負極を作製した。前記黒鉛:94部とPVDF:6部と予めNMPに溶解させておいたバインダ溶液とを混合して、負極合剤含有ペーストを調製した。得られた負極合剤含有ペーストを厚さ10μmの銅箔からなる負極集電体の片面または両面にアプリケータにより塗布した。なお、負極合剤含有ペーストの塗布に際しては、塗布部と未塗布部とが5cmおきに連続するように、かつ集電体の両面に塗布したものでは、表面で塗布部とした箇所は、裏面でも塗布部となるようにした。続いて、塗布した負極合剤含有ペーストを乾燥して負極合剤層を形成し、その後、ロールプレスし、所定の大きさに切断して、帯状の負極を得た。なお、この負極は、幅を40mmとし、負極合剤層形成部の厚みを、集電体の両面に形成したものでは190μm、集電体の片面に形成したものでは100μmとなるようにした。
前記のセパレータと一体化した電池用正極7枚と、集電体の両面に負極合剤層を形成した電池用負極6枚と、集電体の片面に負極合剤層を形成した電池用負極2枚(このうち1枚は、集電体の露出面にPETフィルムを貼り付けたもの)とを用い、集電体の片面に負極合剤層を形成した電池用負極が最外部の電極になるように、電池用正極と電池用負極とを交互に重ねた。そして、各電池用正極の集電タブ部を纏めて溶接し、また、各電池用負極の集電タブ部を纏めて溶接して、電極群を形成した。外装ケース内に前記の電極群を、PETフィルムが外装ケース内面と対向するように入れ、纏められた正極の集電タブ部を外装ケース内面に溶接した。また、封口ケースに絶縁ガスケットを装着し、非水電解液(LiPF6をエチレンカーボネートとメチルエチルカーボネートとの体積比1:2の混合溶媒に、1.2mol/lの濃度で溶解した溶液)200mgを入れた後、電極群を収容した外装ケースを被せ、周囲をかしめて、直径20mm、厚み3.2mmの扁平形非水二次電池を得た。なお、前記の扁平形非水二次電池は、電流値14mAでの放電で、放電容量が70mAhとなるように設計したものである。
PE製微多孔膜セパレータに、厚み16μmで、方向Aにおける熱収縮率Caが3%、方向Bにおける熱収縮率Cbが2%で、Ca/Cb=1.5のものを使用した以外は、実施例1と同様にして扁平形非水二次電池を作製した。
PE製微多孔膜セパレータに、厚み16μmで、方向Aにおける熱収縮率Caが4%、方向Bにおける熱収縮率Cbが4%で、Ca/Cb=1のものを使用した以外は、実施例1と同様にして扁平形非水二次電池を作製した。
実施例1と同じPE製微多孔膜セパレータを、図4および図5に示す形状(図5中iの長さが5mm、iiの長さが0.8mm)で、方向Aが、張り出し部が主体部から突出する方向に平行となるように切り出して用いた以外は、実施例1と同様にして扁平形非水二次電池を作製した。
2 外装ケース
3 封口ケース
4 絶縁ガスケット
5 正極
5a 正極の本体部
5b 正極の集電タブ部
6 負極
6a 負極の本体部
6b 負極の集電タブ部
7 セパレータ
7a セパレータの主体部
7b セパレータの張り出し部
7c 接合部
Claims (3)
- 外装ケースと封口ケースとが絶縁ガスケットを介してカシメ封口されて形成された空間内に、複数の正極と複数の負極とがセパレータを介して交互に積層された電極群および非水電解液を有している扁平形非水二次電池であって、
前記正極は、本体部と、平面視で、前記本体部から突出した、前記本体部よりも幅の狭い集電タブ部とを有しており、前記正極の本体部には、集電体の片面または両面に正極活物質を含む正極合剤層が形成されており、前記正極の集電タブ部では、前記集電体に正極合剤層が形成されておらず、
前記負極は、本体部と、平面視で、前記本体部から突出した、前記本体部よりも幅の狭い集電タブ部とを有しており、前記負極の本体部には、集電体の片面または両面に負極活物質を含む負極剤層が形成されており、前記負極の集電タブ部では、前記集電体に負極剤層が形成されておらず、
少なくとも、両側が負極と対向している正極の両面には、任意の方向Aにおける100℃での熱収縮率Caが1〜20%であり、かつ前記方向Aに直交する方向Bにおける100℃での熱収縮率をCb(%)としたとき、熱収縮率Caと熱収縮率Cbとの比Ca/Cbが1.5以上である熱可塑性樹脂製の微多孔膜からなるセパレータが配置されており、
前記2枚のセパレータは、前記正極の本体部全面を覆う主体部と、前記主体部から突出し、前記正極の集電タブ部の、少なくとも本体部との境界部を含む部分を覆う張り出し部とを有していて、それらの方向Bが、前記正極の集電タブ部が本体部から突出する方向に略平行となるように配置されており、かつ前記2枚のセパレータは、その主体部の周縁部の少なくとも一部において、互いに直接溶着された接合部を有していることを特徴とする扁平形非水二次電池。 - 正極の両面に配置された2枚のセパレータの、前記主体部における外縁の全長さのうちの40%以上が接合部である請求項1に記載の扁平形非水二次電池。
- セパレータを構成する熱可塑性樹脂が、ポリオレフィンである請求項1または2に記載の扁平形非水二次電池。
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