AU2018346985B2 - Multilayer nanoporous separator - Google Patents

Multilayer nanoporous separator Download PDF

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Publication number
AU2018346985B2
AU2018346985B2 AU2018346985A AU2018346985A AU2018346985B2 AU 2018346985 B2 AU2018346985 B2 AU 2018346985B2 AU 2018346985 A AU2018346985 A AU 2018346985A AU 2018346985 A AU2018346985 A AU 2018346985A AU 2018346985 B2 AU2018346985 B2 AU 2018346985B2
Authority
AU
Australia
Prior art keywords
separator
boehmite
coating
layer
nanoporous
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.)
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AU2018346985A
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English (en)
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AU2018346985A1 (en
Inventor
David W. Avison
Steven A. Carlson
Benjamin Sloan
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LG Energy Solution Ltd
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LG Energy Solution Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LG Energy Solution Ltd filed Critical LG Energy Solution Ltd
Publication of AU2018346985A1 publication Critical patent/AU2018346985A1/en
Assigned to LG ENERGY SOLUTION, LTD. reassignment LG ENERGY SOLUTION, LTD. Request for Assignment Assignors: OPTODOT CORPORATION
Priority to AU2023200585A priority Critical patent/AU2023200585B2/en
Application granted granted Critical
Publication of AU2018346985B2 publication Critical patent/AU2018346985B2/en
Priority to AU2024205059A priority patent/AU2024205059A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • 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
    • H01M50/409—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
    • 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
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/431—Inorganic material
    • H01M50/434—Ceramics
    • 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
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
    • 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
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
    • 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
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
    • 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
    • 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
    • H01M50/491—Porosity
    • 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
    • H01M50/497—Ionic conductivity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Ceramic Engineering (AREA)
  • Cell Separators (AREA)
  • Laminated Bodies (AREA)
  • Secondary Cells (AREA)
AU2018346985A 2017-10-13 2018-10-15 Multilayer nanoporous separator Active AU2018346985B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2023200585A AU2023200585B2 (en) 2017-10-13 2023-02-03 Multilayer nanoporous separator
AU2024205059A AU2024205059A1 (en) 2017-10-13 2024-07-24 Multilayer nanoporous separator

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201762572083P 2017-10-13 2017-10-13
US62/572,083 2017-10-13
PCT/US2018/055862 WO2019075457A2 (en) 2017-10-13 2018-10-15 NANOPOROUS MULTILAYER SEPARATOR

Related Child Applications (1)

Application Number Title Priority Date Filing Date
AU2023200585A Division AU2023200585B2 (en) 2017-10-13 2023-02-03 Multilayer nanoporous separator

Publications (2)

Publication Number Publication Date
AU2018346985A1 AU2018346985A1 (en) 2020-05-07
AU2018346985B2 true AU2018346985B2 (en) 2023-02-23

Family

ID=64184195

Family Applications (3)

Application Number Title Priority Date Filing Date
AU2018346985A Active AU2018346985B2 (en) 2017-10-13 2018-10-15 Multilayer nanoporous separator
AU2023200585A Active AU2023200585B2 (en) 2017-10-13 2023-02-03 Multilayer nanoporous separator
AU2024205059A Pending AU2024205059A1 (en) 2017-10-13 2024-07-24 Multilayer nanoporous separator

Family Applications After (2)

Application Number Title Priority Date Filing Date
AU2023200585A Active AU2023200585B2 (en) 2017-10-13 2023-02-03 Multilayer nanoporous separator
AU2024205059A Pending AU2024205059A1 (en) 2017-10-13 2024-07-24 Multilayer nanoporous separator

Country Status (12)

Country Link
US (7) US10998536B2 (enExample)
EP (2) EP4485666A3 (enExample)
JP (2) JP7485596B2 (enExample)
CN (6) CN116632454A (enExample)
AU (3) AU2018346985B2 (enExample)
CA (1) CA3078958A1 (enExample)
ES (1) ES2988674T3 (enExample)
HR (1) HRP20241471T1 (enExample)
HU (1) HUE069169T2 (enExample)
PL (1) PL3695447T3 (enExample)
RS (1) RS66001B1 (enExample)
WO (1) WO2019075457A2 (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021080052A1 (ko) * 2019-10-25 2021-04-29 주식회사 그리너지 리튬 메탈 음극 구조체, 이를 포함하는 전기화학소자, 및 상기 리튬 메탈 음극 구조체의 제조방법
EP4052328A1 (en) * 2019-10-31 2022-09-07 Pacific Industrial Development Corporation Inorganic materials for composite separator in electrochemical cells
CN112290161B (zh) * 2020-09-28 2023-08-04 佛山市金辉高科光电材料股份有限公司 一种超低水分陶瓷涂覆锂离子电池隔膜及其制备方法
CN112624165B (zh) * 2020-12-15 2023-04-18 安徽壹石通材料科技股份有限公司 一种勃姆石溶液的制备方法及含有该溶液的电解液
US20220276185A1 (en) * 2021-02-26 2022-09-01 Honeywell Limited BOEHMITE DETECTION AND WARNING SYSTEM, AND CONCENTRATION INDICATOR FOR LiB SEPARATOR SHEET MANUFACTURING
CN114744363B (zh) * 2022-03-29 2024-05-28 中材锂膜(宁乡)有限公司 锂离子电池隔膜浆料、其制备方法及隔膜
CN115663400A (zh) * 2022-10-21 2023-01-31 重庆造纸工业研究设计院有限责任公司 一种电池隔板及其制备方法
GB2639961A (en) * 2024-03-28 2025-10-08 Hunt Tech Limited Laminate
CN119833885A (zh) * 2025-01-08 2025-04-15 河北金力新能源科技股份有限公司 聚合物-陶瓷一体化锂电池隔膜涂层及其制备方法与应用

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160172705A1 (en) * 2014-12-12 2016-06-16 Samsung Sdi Co., Ltd. Wound electrode assembly for nonaqueous electrolyte rechargeable battery, nonaqueous electrolyte rechargeable battery including the same, and method for manufacturing the same

Family Cites Families (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024323A (en) * 1975-02-06 1977-05-17 Evans Products Company Battery separator
US5210114A (en) 1990-10-25 1993-05-11 Graphics Technology International Inc. Process for preparing stable dispersions useful in transparent coatings
US6194098B1 (en) * 1998-12-17 2001-02-27 Moltech Corporation Protective coating for separators for electrochemical cells
EP1115166A4 (en) 1999-06-22 2004-09-15 Mitsubishi Electric Corp SEPARATOR FOR CELL, CELL AND METHOD FOR PRODUCING THE SEPARATOR
US6432586B1 (en) 2000-04-10 2002-08-13 Celgard Inc. Separator for a high energy rechargeable lithium battery
JP2001319689A (ja) * 2000-05-08 2001-11-16 Matsushita Electric Ind Co Ltd リチウムポリマー二次電池
KR100775310B1 (ko) 2004-12-22 2007-11-08 주식회사 엘지화학 유/무기 복합 다공성 분리막 및 이를 이용한 전기 화학소자
TWI330136B (en) 2005-11-28 2010-09-11 Lg Chemical Ltd Organic/inorganic composite porous membrane and electrochemical device using the same
US7638241B2 (en) 2005-12-06 2009-12-29 Lg Chem, Ltd. Organic/inorganic composite separator having morphology gradient, manufacturing method thereof and electrochemical device containing the same
CN101218695B (zh) * 2005-12-08 2011-07-20 日立麦克赛尔株式会社 电化学元件用隔板及其制造方法以及电化学元件及其制造方法
US8883354B2 (en) 2006-02-15 2014-11-11 Optodot Corporation Separators for electrochemical cells
KR101223081B1 (ko) * 2006-09-07 2013-01-17 히다치 막셀 가부시키가이샤 전지용 세퍼레이터 및 리튬 2차 전지
US8906537B2 (en) * 2006-11-20 2014-12-09 Teijin Limited Separator for non-aqueous secondary battery, process for producing same, and non-aqueous secondary battery separator for non-aqueous secondary battery, process for producing same, and non-aqueous secondary battery
KR101479822B1 (ko) 2007-01-30 2015-01-06 아사히 가세이 이-매터리얼즈 가부시키가이샤 다층 다공막 및 그의 제조 방법
KR100727248B1 (ko) 2007-02-05 2007-06-11 주식회사 엘지화학 다공성 활성층이 코팅된 유기/무기 복합 분리막 및 이를구비한 전기화학소자
KR20100051710A (ko) * 2007-10-03 2010-05-17 히다치 막셀 가부시키가이샤 전지용 세퍼레이터 및 비수전해액 전지
JP4575521B2 (ja) * 2008-08-19 2010-11-04 帝人株式会社 非水系二次電池用セパレータ
US8697290B2 (en) * 2009-01-12 2014-04-15 A123 Systems Llc Laminated battery cell comprising multilayer composite separator and methods for creating the same
JP4836297B2 (ja) 2009-05-21 2011-12-14 旭化成イーマテリアルズ株式会社 多層多孔膜
KR101117126B1 (ko) 2010-04-19 2012-02-24 한국과학기술연구원 금속산화물 초극세 섬유-기반 내열성 복합 분리막 및 이를 이용한 이차전지
EP2596538B1 (en) 2010-07-19 2018-12-19 Optodot Corporation Separators for electrochemical cells
JP5796367B2 (ja) 2011-06-22 2015-10-21 日産自動車株式会社 耐熱絶縁層付セパレータ
JP6003041B2 (ja) 2011-11-10 2016-10-05 日産自動車株式会社 耐熱絶縁層付セパレータ
JP2015028840A (ja) 2011-11-29 2015-02-12 日立マクセル株式会社 非水電解液電池用セパレータおよび非水電解液電池
JP6179125B2 (ja) 2012-04-09 2017-08-16 株式会社Ｇｓユアサ 蓄電素子
JP5741982B2 (ja) 2012-08-23 2015-07-01 Jnc株式会社 耐熱性に優れた複合多孔質膜
JP5751454B2 (ja) 2012-12-14 2015-07-22 トヨタ自動車株式会社 非水電解質二次電池
KR102423012B1 (ko) 2013-03-15 2022-07-19 암테크 리서치 인터내셔널 엘엘씨 독립형 치수적 안정한 미공성 웹
US10079379B2 (en) * 2013-03-19 2018-09-18 Murata Manufacturing Co., Ltd. Separator, battery, battery pack, electronic apparatus, electric vehicle, power storage device, and electric power system
DE112014002202T5 (de) * 2013-04-29 2016-04-14 Madico, Inc. Nanoporöse Separatoren aus Verbundwerkstoff mit erhöhter Wärmeleitfähigkeit
CN103383925B (zh) 2013-07-02 2015-06-03 京东方科技集团股份有限公司 显示设备、裸眼3d功能面板的信号基板及其制造方法
JP5923747B2 (ja) * 2013-12-04 2016-05-25 パナソニックＩｐマネジメント株式会社 ナトリウム二次電池
US9548362B2 (en) * 2014-10-10 2017-01-17 Taiwan Semiconductor Manufacturing Company, Ltd. High mobility devices with anti-punch through layers and methods of forming same
CA2975321A1 (en) 2015-01-28 2016-08-04 Hercules Llc Ceramic binder composition for ceramic coated separator for lithium ion batteries, methods of producing same, and uses thereof
US10381623B2 (en) * 2015-07-09 2019-08-13 Optodot Corporation Nanoporous separators for batteries and related manufacturing methods
WO2017010780A1 (ko) * 2015-07-10 2017-01-19 주식회사 엘지화학 세퍼레이터 및 이를 포함하는 전기화학소자
KR102544227B1 (ko) * 2016-04-12 2023-06-16 에스케이이노베이션 주식회사 리튬이차전지용 분리막 및 이를 포함하는 리튬이차전지
KR101940166B1 (ko) * 2016-04-14 2019-01-18 삼성에스디아이 주식회사 다공성 내열층 조성물, 다공성 내열층을 포함하는 분리막, 및 상기 분리막을 이용한 전기 화학 전지
KR20180000561A (ko) * 2016-06-23 2018-01-03 에스케이이노베이션 주식회사 내열성 및 전해액 함침성이 우수한 세퍼레이터

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160172705A1 (en) * 2014-12-12 2016-06-16 Samsung Sdi Co., Ltd. Wound electrode assembly for nonaqueous electrolyte rechargeable battery, nonaqueous electrolyte rechargeable battery including the same, and method for manufacturing the same

Also Published As

Publication number Publication date
AU2024205059A1 (en) 2024-08-15
RS66001B1 (sr) 2024-10-31
US20200266414A1 (en) 2020-08-20
WO2019075457A3 (en) 2019-05-31
CN111448683B (zh) 2023-05-26
AU2023200585B2 (en) 2024-06-13
US11973181B2 (en) 2024-04-30
US20240266593A1 (en) 2024-08-08
US20250158106A1 (en) 2025-05-15
US12412923B2 (en) 2025-09-09
CN111448683A (zh) 2020-07-24
CN116722310A (zh) 2023-09-08
US12412924B2 (en) 2025-09-09
KR20200070316A (ko) 2020-06-17
CN116914372A (zh) 2023-10-20
ES2988674T3 (es) 2024-11-21
JP7485596B2 (ja) 2024-05-16
JP2020537307A (ja) 2020-12-17
EP4485666A2 (en) 2025-01-01
AU2023200585A1 (en) 2023-03-09
EP3695447A2 (en) 2020-08-19
US11769903B2 (en) 2023-09-26
CN116722311A (zh) 2023-09-08
US20220094018A1 (en) 2022-03-24
US20210242536A1 (en) 2021-08-05
CN116632454A (zh) 2023-08-22
US20250167289A1 (en) 2025-05-22
CN116581479A (zh) 2023-08-11
HUE069169T2 (hu) 2025-02-28
EP3695447B1 (en) 2024-09-11
PL3695447T3 (pl) 2025-01-07
WO2019075457A2 (en) 2019-04-18
CA3078958A1 (en) 2019-04-18
AU2018346985A1 (en) 2020-05-07
HRP20241471T1 (hr) 2025-01-03
US10998536B2 (en) 2021-05-04
US12412922B2 (en) 2025-09-09
US20250158107A1 (en) 2025-05-15
EP3695447C0 (en) 2024-09-11
EP4485666A3 (en) 2025-10-29
JP2024105412A (ja) 2024-08-06

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