JP2019117716A - 二次電池 - Google Patents
二次電池 Download PDFInfo
- Publication number
- JP2019117716A JP2019117716A JP2017250737A JP2017250737A JP2019117716A JP 2019117716 A JP2019117716 A JP 2019117716A JP 2017250737 A JP2017250737 A JP 2017250737A JP 2017250737 A JP2017250737 A JP 2017250737A JP 2019117716 A JP2019117716 A JP 2019117716A
- Authority
- JP
- Japan
- Prior art keywords
- active material
- porous
- electrode
- secondary battery
- current collector
- 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
- 239000011149 active material Substances 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 239000011148 porous material Substances 0.000 claims abstract description 33
- 239000007773 negative electrode material Substances 0.000 claims abstract description 29
- 239000007774 positive electrode material Substances 0.000 claims abstract description 24
- 150000003839 salts Chemical class 0.000 claims abstract description 17
- 239000008151 electrolyte solution Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 35
- 150000002500 ions Chemical class 0.000 description 16
- 235000002639 sodium chloride Nutrition 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 14
- -1 phosphoric acid compound Chemical class 0.000 description 14
- 239000004020 conductor Substances 0.000 description 12
- 238000011049 filling Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000002131 composite material Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 239000011800 void material Substances 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 239000011267 electrode slurry Substances 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
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- 239000002612 dispersion medium Substances 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
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- 239000002904 solvent Substances 0.000 description 4
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 3
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- 229910013870 LiPF 6 Inorganic materials 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
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- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 2
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- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 2
- 229910013063 LiBF 4 Inorganic materials 0.000 description 2
- 229910013684 LiClO 4 Inorganic materials 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
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- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 2
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 2
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- 238000000576 coating method Methods 0.000 description 2
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- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 150000005676 cyclic carbonates Chemical class 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 150000004862 dioxolanes Chemical class 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 150000002240 furans Chemical class 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
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- 239000010931 gold Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- DMEJJWCBIYKVSB-UHFFFAOYSA-N lithium vanadium Chemical compound [Li].[V] DMEJJWCBIYKVSB-UHFFFAOYSA-N 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
- ZXMGHDIOOHOAAE-UHFFFAOYSA-N 1,1,1-trifluoro-n-(trifluoromethylsulfonyl)methanesulfonamide Chemical compound FC(F)(F)S(=O)(=O)NS(=O)(=O)C(F)(F)F ZXMGHDIOOHOAAE-UHFFFAOYSA-N 0.000 description 1
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 1
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- ILPJNWCKZTZRJZ-UHFFFAOYSA-N 2,2,3,3-tetramethylthiolane 1,1-dioxide Chemical compound CC1(C)CCS(=O)(=O)C1(C)C ILPJNWCKZTZRJZ-UHFFFAOYSA-N 0.000 description 1
- SJMSHBHQMICGBL-UHFFFAOYSA-N 2,2-dimethylpentan-3-yl hydrogen carbonate Chemical compound CCC(C(C)(C)C)OC(O)=O SJMSHBHQMICGBL-UHFFFAOYSA-N 0.000 description 1
- HTWIZMNMTWYQRN-UHFFFAOYSA-N 2-methyl-1,3-dioxolane Chemical compound CC1OCCO1 HTWIZMNMTWYQRN-UHFFFAOYSA-N 0.000 description 1
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- OYOKPDLAMOMTEE-UHFFFAOYSA-N 4-chloro-1,3-dioxolan-2-one Chemical compound ClC1COC(=O)O1 OYOKPDLAMOMTEE-UHFFFAOYSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
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- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
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- 229920002943 EPDM rubber Polymers 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
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- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
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- 239000004743 Polypropylene Substances 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
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- 230000002411 adverse Effects 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
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- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- ROCSCYHXUBXLGH-UHFFFAOYSA-N hexan-3-yl hydrogen carbonate Chemical compound CCCC(CC)OC(O)=O ROCSCYHXUBXLGH-UHFFFAOYSA-N 0.000 description 1
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- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
-
- 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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Abstract
Description
多孔質集電体と、正極活物質及び負極活物質のうちの一方の活物質を含み前記多孔質集電体の孔表面に形成された活物質層と、を有する多孔質電極と、
前記多孔質電極の孔表面に該孔の空隙が残るように形成されたイオン伝導性の絶縁膜と、
前記正極活物質及び前記負極活物質のうちの他方の活物質と支持塩とを含み、前記絶縁膜が形成された前記多孔質電極の前記空隙に充填された液状電極と、
を備えた、ものである。
正極活物質74として層状岩塩型構造を有するLi(Ni1/3Mn1/3Co1/3)O2(粒径約5.0μm)を90.5質量%、導電材としてアセチレンブラックを8.0質量%、及び、バインダーとしてPVdFを1.5質量%含む正極合材を、適量の分散媒(N−メチル−2−ピロリドン)を用いて混合し、正極スラリーを得た。この正極スラリーを、網目構造のNi金属発泡体(住友電工製のセルメット、品番#6)である5×5×35mmの多孔質集電体72のうちの、5×5×20mmの部分にディップ法により塗布・乾燥して活物質層76を形成し、多孔質正極70を作製した。活物質層76の厚みは50μmであった。活物質層76には、0.72gの正極合材が含まれていた。つづいて、多孔質正極70のうち活物質層76の形成されていない多孔質集電体部分にNi製の正極タブ78を溶接した。
得られた多孔質正極70の表面に、VdF−HFPの共重合体を含むスラリーを、ディップ法により塗布・乾燥して、絶縁膜80を形成した。絶縁膜80の膜厚は、モデル実験などから、2〜10μm程度と推察された。絶縁膜80が形成された多孔質電極70を、放射光を線源に用いたCTにより観察したところ、多孔質電極70の孔の空隙が約60体積%残っていることが確認された。
エチレンカーボネートとジエチルカーボネートとを体積比3:7で混合した混合溶媒に、LiPF6を2mol/Lとなるように溶解して電解液96を調製した。得られた電解液96に負極活物質94としての人造黒鉛粉末(粒径約10μm)を懸濁させ、スラリー状の液状負極90を得た。液状負極90において、負極活物質94の濃度は65質量%とした。
絶縁膜80が形成された多孔質正極70を液状負極90に浸漬させ、さらに真空引きすることにより、液状負極90を多孔質正極70の空隙に充填して電極複合体65を作製した。このとき、絶縁膜80には、液状負極90の一部の電解液96が含浸され、ゲルポリマー電解質となる。続いて、この電極複合体65を若干の余剰液状負極90と共にアルミラミネート袋62に挿入し、さらに集電体を兼ねるNi製の負極タブ98を液状負極90と接触するように挿入し、熱溶着によって密封した。この二次電池60には、0.55gの負極活物質94が含まれていた。
作製した二次電池60を用いて、3.0−4.2Vの範囲で、0.2C(16mA)の定電流充放電試験を実施した。その結果、初回の放電容量として76.6mAhが得られ、活物質層76が形成された部位の多孔質正極サイズ換算で465Wh/Lという高エネルギー密度を実現できた。市販のリチウム二次電池のエネルギー密度は、200〜400Wh/L程度が一般的であるが、実施例では、そうしたものに比してエネルギー密度(電池容量)を高めることができ、また、従来のシート対向型電池(上述した捲回型や積層型など)で同容量のものと比較すると出力の低下を抑制できることがわかった。
Claims (8)
- 多孔質集電体と、正極活物質及び負極活物質のうちの一方の活物質を含み前記多孔質集電体の孔表面に形成された活物質層と、を有する多孔質電極と、
前記多孔質電極の孔表面に該孔の空隙が残るように形成されたイオン伝導性の絶縁膜と、
前記正極活物質及び前記負極活物質のうちの他方の活物質と支持塩とを含み、前記絶縁膜が形成された前記多孔質電極の前記空隙に充填された液状電極と、
を備えた、二次電池。 - 前記多孔質集電体は、10μm以上2000μm以下の空隙が三次元的に連結した多孔体である、請求項1に記載の二次電池。
- 前記多孔質集電体は、50μm以上600μm以下の空隙が三次元的に連結した多孔体である、請求項1又は2に記載の二次電池。
- 前記活物質層は、厚みが5μm以上1000μm以下である、請求項1〜3のいずれか1項に記載の二次電池。
- 前記活物質層は、厚みが25μm以上250μm以下である、請求項1〜4のいずれか1項に記載の二次電池。
- 前記多孔質集電体は、金属製もしくは炭素製である、請求項1〜5のいずれか1項に記載の二次電池。
- 前記多孔質集電体は、網目構造、ジャイロイド構造、逆オパール構造、ファイバー構造からなる群より選ばれる1以上の構造を有している、請求項1〜6のいずれか1項に記載の二次電池。
- 前記液状電極は、電解液に粉末状の前記他方の活物質を分散させたものである、請求項1〜7のいずれか1項に記載の二次電池。
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