JP2014211977A - 二次電池負極用バインダーと二次電池負極及びリチウムイオン二次電池 - Google Patents
二次電池負極用バインダーと二次電池負極及びリチウムイオン二次電池 Download PDFInfo
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- JP2014211977A JP2014211977A JP2013086702A JP2013086702A JP2014211977A JP 2014211977 A JP2014211977 A JP 2014211977A JP 2013086702 A JP2013086702 A JP 2013086702A JP 2013086702 A JP2013086702 A JP 2013086702A JP 2014211977 A JP2014211977 A JP 2014211977A
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- Prior art keywords
- negative electrode
- secondary battery
- binder
- active material
- battery negative
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Links
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- 239000007773 negative electrode material Substances 0.000 claims abstract description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
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- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
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- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 1
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- ZLTPDFXIESTBQG-UHFFFAOYSA-N isothiazole Chemical group C=1C=NSC=1 ZLTPDFXIESTBQG-UHFFFAOYSA-N 0.000 description 1
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- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 1
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- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 108010064470 polyaspartate Proteins 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920002643 polyglutamic acid Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 238000001878 scanning electron micrograph Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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- 238000003980 solgel method Methods 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
本発明の二次電池負極は、集電体と、集電体の表面に形成された負極活物質層と、からなり、負極活物質層は、負極活物質と、本発明のバインダーと、を含む。
酢酸銅2gを純水20mlに溶解させ、それを撹拌しながら0.5NのNaOH水溶液10mlを滴下した。全量滴下後に2時間撹拌し、析出した沈殿を濾別して10mlの純水で2回洗浄し10mlのアセトンでリンスした後、真空下で3時間乾燥して青色の塩基性酢酸銅(化1式参照)の粉末1gを得た。
濃度46質量%のHF水溶液3mlと、濃度36質量%のHCl水溶液300mlとの混合溶液20mlを氷浴中で0℃とし、アルゴンガス気流中にてそこへ5gの二ケイ化カルシウム(CaSi2)を加えて撹拌した。発泡が完了したのを確認した後に室温まで昇温し、室温でさらに2時間撹拌した後、蒸留水20mlを加えてさらに5分間撹拌した。このとき黄色粉末が浮遊した。
得られた灰色粉末45質量部と、天然黒鉛粉末40質量部と、アセチレンブラック5質量部と、上記で得られたポリアクリル酸−塩基性酢酸銅化合物のNMP溶液10質量部とを混合してスラリーを調製した。このスラリーを、厚さ約20μmの電解銅箔(集電体)の表面にドクターブレードを用いて塗布し、銅箔上に負極活物質層を形成した。その後、ロールプレス機により、集電体と負極活物質層を強固に密着接合させた。これを100℃で2時間真空乾燥し、負極活物質層の厚さが16μmの負極を形成した。
酢酸銅2gを純水20mlに溶解させ、それを撹拌しながら0.5NのNaOH水溶液20mlを滴下した。全量滴下後に2時間撹拌し、析出した沈殿を濾別して10mlの純水で2回洗浄し10mlのアセトンでリンスした後、真空下で3時間乾燥して水酸化銅(化4式参照)の粉末1.5gを得た。この粉末の色調は、実施例1の塩基性酢酸銅粉末より緑がかった青色であった。
ポリアクリル酸−塩基性酢酸銅反応物のNMP溶液に代えてポリアクリル酸−銅反応物のNMP溶液を同量用いたこと以外は実施例1と同様にして、リチウムイオン二次電池を得た。
酢酸ニッケル2.1gを純水20mlに溶解させ、それを撹拌しながら0.5NのNaOH水溶液10mlを滴下した。全量滴下後に2時間撹拌し、析出した沈殿を濾別して10mlの純水で2回洗浄し10mlのアセトンでリンスした後、真空下で12時間乾燥して塩基性酢酸ニッケル[Ni(OH)(OOCCH3)]の粉末1.2gを得た。
ポリアクリル酸−塩基性酢酸銅反応物のNMP溶液に代えてポリアクリル酸−塩基性酢酸ニッケル反応物のNMP溶液を同量用いたこと以外は実施例1と同様にして、リチウムイオン二次電池を得た。
ポリアクリル酸−塩基性酢酸銅化合物のNMP溶液に代えて、実施例1と同様のポリアクリル酸0.8gを9.2gのN-メチル-2-ピロリドン(NMP)に溶解させたポリアクリル酸のNMP溶液を同量用いたこと以外は実施例1と同様にして、リチウムイオン二次電池を得た。
実施例1〜3及び比較例1のリチウムイオン二次電池について、温度25℃、電流0.2mAの条件で充電した際の初期の充電容量を測定し、結果を表2に示す。また電流0.2mAの条件で放電させた際の初期の放電容量を測定し、結果を表2に示す。さらに初期効率(初期充電容量/初期放電容量)を算出し、結果を表2に示す。
Claims (9)
- 少なくとも一部の側鎖にカルボキシル基をもつポリマーと、銅(Cu)、ニッケル(Ni)及びコバルト(Co)から選ばれる少なくとも一種の金属元素の化合物と、の反応物からなることを特徴とする二次電池負極用バインダー。
- 前記ポリマーはポリアクリル酸である請求項1に記載の二次電池負極用バインダー。
- 前記反応物は前記側鎖の末端にアシル基を有する請求項1又は請求項2に記載の二次電池負極用バインダー。
- 前記金属元素は前記ポリマー100質量部に対して0.01〜10質量部含まれている請求項1〜3のいずれかに記載の二次電池負極用バインダー。
- 集電体と、該集電体の表面に形成された負極活物質層と、からなり、該負極活物質層は、負極活物質と、請求項1〜4のいずれかに記載のバインダーと、を含むことを特徴とする二次電池負極。
- 前記負極活物質は、ケイ素原子で構成された六員環が複数連なった構造をなし組成式(SiH)nで示される層状ポリシランを熱処理することで製造されたナノシリコンからなる凝集粒子である請求項5に記載の二次電池負極。
- 非晶質の炭素からなり前記凝集粒子の少なくとも一部を覆って複合化された炭素層を有する請求項6に記載の二次電池負極。
- ケイ素と炭素との組成比は重量比でSi/C=3/1〜20/1である請求項7に記載の二次電池負極。
- 請求項5〜8のいずれかに記載の二次電池負極を有することを特徴とするリチウムイオン二次電池。
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