JP2019535110A5 - - Google Patents
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- JP2019535110A5 JP2019535110A5 JP2019519248A JP2019519248A JP2019535110A5 JP 2019535110 A5 JP2019535110 A5 JP 2019535110A5 JP 2019519248 A JP2019519248 A JP 2019519248A JP 2019519248 A JP2019519248 A JP 2019519248A JP 2019535110 A5 JP2019535110 A5 JP 2019535110A5
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- anode
- slurry according
- carbon
- active material
- 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.)
- Pending
Links
- 239000002002 slurry Substances 0.000 claims 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 10
- 239000006183 anode active material Substances 0.000 claims 8
- 239000002245 particle Substances 0.000 claims 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 5
- 229910001416 lithium ion Inorganic materials 0.000 claims 5
- 239000002904 solvent Substances 0.000 claims 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims 3
- 239000011230 binding agent Substances 0.000 claims 3
- 229910052799 carbon Inorganic materials 0.000 claims 3
- 239000006258 conductive agent Substances 0.000 claims 3
- 239000000463 material Substances 0.000 claims 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 3
- -1 polytetrafluoroethylene Polymers 0.000 claims 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims 2
- 229920000459 Nitrile rubber Polymers 0.000 claims 2
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims 2
- 239000000783 alginic acid Substances 0.000 claims 2
- 229920000615 alginic acid Polymers 0.000 claims 2
- 235000010443 alginic acid Nutrition 0.000 claims 2
- 229960001126 alginic acid Drugs 0.000 claims 2
- 150000004781 alginic acids Chemical class 0.000 claims 2
- 239000006256 anode slurry Substances 0.000 claims 2
- 229920001577 copolymer Polymers 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 2
- 229910021389 graphene Inorganic materials 0.000 claims 2
- 229910002804 graphite Inorganic materials 0.000 claims 2
- 239000010439 graphite Substances 0.000 claims 2
- 239000002931 mesocarbon microbead Substances 0.000 claims 2
- 229920000058 polyacrylate Polymers 0.000 claims 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims 2
- 150000003839 salts Chemical class 0.000 claims 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims 1
- KXJGSNRAQWDDJT-UHFFFAOYSA-N 1-acetyl-5-bromo-2h-indol-3-one Chemical compound BrC1=CC=C2N(C(=O)C)CC(=O)C2=C1 KXJGSNRAQWDDJT-UHFFFAOYSA-N 0.000 claims 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims 1
- XCKPLVGWGCWOMD-YYEYMFTQSA-N 3-[[(2r,3r,4s,5r,6r)-6-[(2s,3s,4r,5r)-3,4-bis(2-cyanoethoxy)-2,5-bis(2-cyanoethoxymethyl)oxolan-2-yl]oxy-3,4,5-tris(2-cyanoethoxy)oxan-2-yl]methoxy]propanenitrile Chemical compound N#CCCO[C@H]1[C@H](OCCC#N)[C@@H](COCCC#N)O[C@@]1(COCCC#N)O[C@@H]1[C@H](OCCC#N)[C@@H](OCCC#N)[C@H](OCCC#N)[C@@H](COCCC#N)O1 XCKPLVGWGCWOMD-YYEYMFTQSA-N 0.000 claims 1
- 239000004925 Acrylic resin Substances 0.000 claims 1
- 229920000178 Acrylic resin Polymers 0.000 claims 1
- 229920000049 Carbon (fiber) Polymers 0.000 claims 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims 1
- 229920008347 Cellulose acetate propionate Polymers 0.000 claims 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims 1
- 239000002033 PVDF binder Substances 0.000 claims 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 claims 1
- 239000004952 Polyamide Substances 0.000 claims 1
- 239000005062 Polybutadiene Substances 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 claims 1
- 239000004642 Polyimide Substances 0.000 claims 1
- 239000004721 Polyphenylene oxide Substances 0.000 claims 1
- 239000004793 Polystyrene Substances 0.000 claims 1
- 239000004372 Polyvinyl alcohol Substances 0.000 claims 1
- 229910018540 Si C Inorganic materials 0.000 claims 1
- 229910006404 SnO 2 Inorganic materials 0.000 claims 1
- 229920002125 Sokalan® Polymers 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 229920000800 acrylic rubber Polymers 0.000 claims 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims 1
- 229910021383 artificial graphite Inorganic materials 0.000 claims 1
- 230000002902 bimodal effect Effects 0.000 claims 1
- 238000009835 boiling Methods 0.000 claims 1
- RDHPKYGYEGBMSE-UHFFFAOYSA-N bromoethane Chemical compound CCBr RDHPKYGYEGBMSE-UHFFFAOYSA-N 0.000 claims 1
- 229920005549 butyl rubber Polymers 0.000 claims 1
- 239000006229 carbon black Substances 0.000 claims 1
- 239000004917 carbon fiber Substances 0.000 claims 1
- 239000002134 carbon nanofiber Substances 0.000 claims 1
- 239000002041 carbon nanotube Substances 0.000 claims 1
- 229910021393 carbon nanotube Inorganic materials 0.000 claims 1
- 239000001768 carboxy methyl cellulose Substances 0.000 claims 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims 1
- 150000001768 cations Chemical class 0.000 claims 1
- 229920002301 cellulose acetate Polymers 0.000 claims 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 claims 1
- 239000011246 composite particle Substances 0.000 claims 1
- 239000008367 deionised water Substances 0.000 claims 1
- 229910021641 deionized water Inorganic materials 0.000 claims 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims 1
- 239000012153 distilled water Substances 0.000 claims 1
- 239000003822 epoxy resin Substances 0.000 claims 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims 1
- 229920001973 fluoroelastomer Polymers 0.000 claims 1
- 229920002313 fluoropolymer Polymers 0.000 claims 1
- 229910021385 hard carbon Inorganic materials 0.000 claims 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims 1
- 229920002681 hypalon Polymers 0.000 claims 1
- 229920000126 latex Polymers 0.000 claims 1
- 239000004816 latex Substances 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 claims 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000002064 nanoplatelet Substances 0.000 claims 1
- 229910021382 natural graphite Inorganic materials 0.000 claims 1
- 239000005011 phenolic resin Substances 0.000 claims 1
- 229920001568 phenolic resin Polymers 0.000 claims 1
- 229920002755 poly(epichlorohydrin) Polymers 0.000 claims 1
- 229920002627 poly(phosphazenes) Polymers 0.000 claims 1
- 229920002401 polyacrylamide Polymers 0.000 claims 1
- 239000004584 polyacrylic acid Substances 0.000 claims 1
- 229920002239 polyacrylonitrile Polymers 0.000 claims 1
- 229920002647 polyamide Polymers 0.000 claims 1
- 229920002857 polybutadiene Polymers 0.000 claims 1
- 229920005646 polycarboxylate Polymers 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 229920000728 polyester Polymers 0.000 claims 1
- 229920000570 polyether Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 229920001721 polyimide Polymers 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 229920000193 polymethacrylate Polymers 0.000 claims 1
- 229920002223 polystyrene Polymers 0.000 claims 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 1
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- 229920002689 polyvinyl acetate Polymers 0.000 claims 1
- 239000011118 polyvinyl acetate Substances 0.000 claims 1
- 229920002451 polyvinyl alcohol Polymers 0.000 claims 1
- 229920002717 polyvinylpyridine Polymers 0.000 claims 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims 1
- 229910010271 silicon carbide Inorganic materials 0.000 claims 1
- 239000011856 silicon-based particle Substances 0.000 claims 1
- 229910021384 soft carbon Inorganic materials 0.000 claims 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims 1
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201662406405P | 2016-10-11 | 2016-10-11 | |
| US62/406,405 | 2016-10-11 | ||
| PCT/CN2017/104248 WO2018068663A1 (en) | 2016-10-11 | 2017-09-29 | Anode slurry for lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2019535110A JP2019535110A (ja) | 2019-12-05 |
| JP2019535110A5 true JP2019535110A5 (enExample) | 2020-11-12 |
Family
ID=61905151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2019519248A Pending JP2019535110A (ja) | 2016-10-11 | 2017-09-29 | リチウムイオン電池用アノードスラリー |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US10727489B2 (enExample) |
| EP (1) | EP3526845A4 (enExample) |
| JP (1) | JP2019535110A (enExample) |
| KR (1) | KR102319176B1 (enExample) |
| CN (1) | CN109923697B (enExample) |
| SG (1) | SG11202000093PA (enExample) |
| TW (1) | TW201824622A (enExample) |
| WO (1) | WO2018068663A1 (enExample) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108844878A (zh) * | 2018-05-24 | 2018-11-20 | 宁德时代新能源科技股份有限公司 | 负极极片、极片活性比表面积的测试方法及电池 |
| US11611097B2 (en) | 2018-11-06 | 2023-03-21 | Utility Global, Inc. | Method of making an electrochemical reactor via sintering inorganic dry particles |
| US11539053B2 (en) | 2018-11-12 | 2022-12-27 | Utility Global, Inc. | Method of making copper electrode |
| US11761100B2 (en) | 2018-11-06 | 2023-09-19 | Utility Global, Inc. | Electrochemical device and method of making |
| US11603324B2 (en) | 2018-11-06 | 2023-03-14 | Utility Global, Inc. | Channeled electrodes and method of making |
| JP2022512964A (ja) | 2018-11-06 | 2022-02-07 | ユティリティ グローバル，インコーポレイテッド | 燃料電池を製造し、その構成要素を処理する方法 |
| WO2020102140A1 (en) * | 2018-11-12 | 2020-05-22 | Utility Global, Inc. | Manufacturing method with particle size control |
| KR102764219B1 (ko) * | 2019-10-31 | 2025-02-05 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 전해액 및 이를 포함하는 리튬 이차 전지 |
| EP4073853A4 (en) * | 2019-12-13 | 2024-02-28 | Sicona Battery Technologies Pty Ltd | MULTIFUNCTIONAL POLYMER BINDER FOR ANODE AND METHOD FOR PRODUCING THE SAME |
| US11978902B2 (en) | 2019-12-25 | 2024-05-07 | Ningde Amperex Technology Limited | Anode and method for preparing the same |
| WO2022255745A1 (ko) * | 2021-06-01 | 2022-12-08 | 주식회사 엘지에너지솔루션 | 전고체 리튬 이차전지 및 이의 제조 방법 |
| FR3127634A1 (fr) * | 2021-09-27 | 2023-03-31 | Arkema France | Revetement d’anode pour batterie li-ion tout solide |
| CN114420927B (zh) * | 2022-01-24 | 2023-08-08 | 蜂巢能源科技股份有限公司 | 一种负极材料及其制备方法和负极片 |
| KR20230139409A (ko) * | 2022-03-25 | 2023-10-05 | 주식회사 엘지에너지솔루션 | 음극 슬러리, 음극 슬러리의 제조 방법, 음극 슬러리를 포함하는 리튬 이차 전지용 음극 및 리튬 이차 전지용 음극의 제조 방법 |
| EP4539148A1 (en) * | 2022-12-26 | 2025-04-16 | LG Energy Solution, Ltd. | Anode composition, method for preparing same, anode slurry, anode, and lithium secondary battery |
Family Cites Families (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002216754A (ja) * | 2001-01-17 | 2002-08-02 | Nippon Steel Corp | リチウム二次電池用負極活物質およびリチウム二次電池 |
| JP4135348B2 (ja) * | 2001-10-03 | 2008-08-20 | 株式会社ジーエス・ユアサコーポレーション | 非水電解質電池 |
| CN100492721C (zh) | 2006-03-15 | 2009-05-27 | 浙江南都电源动力股份有限公司 | 高倍率锂离子电池极片及其制备方法 |
| CN101154720A (zh) | 2006-09-29 | 2008-04-02 | 深圳市比克电池有限公司 | 一种锂电池的负极浆料、制备方法及锂电池 |
| CN101425605B (zh) * | 2007-11-01 | 2011-09-21 | 深圳市慧通天下科技股份有限公司 | 一种镍钴锰酸锂高功率锂离子电池 |
| CN101436654B (zh) * | 2007-11-13 | 2011-06-15 | 深圳市慧通天下科技股份有限公司 | 磷酸铁锂型安全高功率锂离子电池 |
| JP4968183B2 (ja) * | 2007-11-14 | 2012-07-04 | ソニー株式会社 | 非水電解質二次電池および非水電解質二次電池の製造方法 |
| CN101651234B (zh) * | 2008-08-13 | 2012-10-17 | 比亚迪股份有限公司 | 一种锂离子二次电池 |
| CN101499530B (zh) | 2009-03-04 | 2011-05-04 | 深圳市崧鼎实业有限公司 | 一种高倍率充放电锂离子电池及其制备方法 |
| CN101651227A (zh) * | 2009-08-31 | 2010-02-17 | 山东神工电池新科技有限公司 | 一种高寿命水溶性锂电池及其制作工艺 |
| JP5673545B2 (ja) * | 2009-09-25 | 2015-02-18 | 日本ゼオン株式会社 | リチウムイオン二次電池負極及びリチウムイオン二次電池 |
| JP2012181967A (ja) * | 2011-02-28 | 2012-09-20 | Sanyo Electric Co Ltd | 非水電解質二次電池の製造方法および非水電解質二次電池用塗布極板の乾燥装置 |
| WO2012132958A1 (ja) * | 2011-03-31 | 2012-10-04 | 三洋電機株式会社 | リチウム二次電池及びその製造方法 |
| JP5743150B2 (ja) * | 2011-08-25 | 2015-07-01 | トヨタ自動車株式会社 | 非水二次電池製造方法 |
| JP5679206B2 (ja) * | 2011-10-06 | 2015-03-04 | トヨタ自動車株式会社 | リチウムイオン二次電池用負極の製造方法およびリチウムイオン二次電池の製造方法 |
| JP5614592B2 (ja) * | 2011-10-12 | 2014-10-29 | トヨタ自動車株式会社 | 二次電池用電極の製造方法 |
| CN102544461A (zh) | 2012-02-17 | 2012-07-04 | 电子科技大学 | 一种锂离子电池负极材料及其制备方法 |
| JP6201989B2 (ja) * | 2012-06-07 | 2017-09-27 | 日本ゼオン株式会社 | 負極スラリー組成物、リチウムイオン二次電池負極及びリチウムイオン二次電池 |
| JP5880964B2 (ja) * | 2012-06-28 | 2016-03-09 | トヨタ自動車株式会社 | 非水電解質二次電池 |
| CN104393235A (zh) * | 2014-04-21 | 2015-03-04 | 天津锦美碳材科技发展有限公司 | 一种锂盐改性锂离子电池负极材料及其制备方法 |
| CN105149186A (zh) | 2014-05-27 | 2015-12-16 | 中信国安盟固利动力科技有限公司 | 锂电池极片涂布过程中极片的烘干方法及烘干装置 |
| KR20160005555A (ko) * | 2014-07-07 | 2016-01-15 | 삼성에스디아이 주식회사 | 리튬전지 |
| HUE044433T2 (hu) * | 2014-07-30 | 2019-10-28 | Zeon Corp | Készítmény nemvizes akkumulátor funkcionális rétegeihez, funkcionális réteggel ellátott hordozó nemvizes akkumulátorhoz, eljárás laminátum elõállítására nemvizes akkumulátorhoz, valamint nemvizes akkumulátor |
| JP6488592B2 (ja) * | 2014-08-27 | 2019-03-27 | 日本ゼオン株式会社 | リチウムイオン二次電池負極用スラリー組成物、リチウムイオン二次電池用負極およびリチウムイオン二次電池 |
| US20160118685A1 (en) * | 2014-10-24 | 2016-04-28 | Battelle Memorial Institute | Methods and compositions for lithium ion batteries |
| WO2016084364A1 (ja) * | 2014-11-25 | 2016-06-02 | 日本ゼオン株式会社 | 非水系二次電池用バインダー、非水系二次電池機能層用組成物、非水系二次電池用機能層および非水系二次電池 |
| CN104766944B (zh) * | 2015-03-30 | 2018-08-07 | 深圳市斯盛能源股份有限公司 | 一种锂离子二次电池负极极片及制备方法 |
-
2017
- 2017-09-29 CN CN201780062734.4A patent/CN109923697B/zh active Active
- 2017-09-29 WO PCT/CN2017/104248 patent/WO2018068663A1/en not_active Ceased
- 2017-09-29 EP EP17860243.9A patent/EP3526845A4/en not_active Withdrawn
- 2017-09-29 KR KR1020197010466A patent/KR102319176B1/ko active Active
- 2017-09-29 US US16/313,944 patent/US10727489B2/en active Active
- 2017-09-29 JP JP2019519248A patent/JP2019535110A/ja active Pending
- 2017-09-29 SG SG11202000093PA patent/SG11202000093PA/en unknown
- 2017-10-05 TW TW106134402A patent/TW201824622A/zh unknown
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