JP2015162412A - 電極合剤の製造方法及び電極の製造方法 - Google Patents
電極合剤の製造方法及び電極の製造方法 Download PDFInfo
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- JP2015162412A JP2015162412A JP2014037930A JP2014037930A JP2015162412A JP 2015162412 A JP2015162412 A JP 2015162412A JP 2014037930 A JP2014037930 A JP 2014037930A JP 2014037930 A JP2014037930 A JP 2014037930A JP 2015162412 A JP2015162412 A JP 2015162412A
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- Prior art keywords
- composite oxide
- lithium metal
- metal composite
- electrode mixture
- lithium
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 107
- 239000002905 metal composite material Substances 0.000 claims abstract description 83
- 239000007864 aqueous solution Substances 0.000 claims abstract description 34
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 30
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002033 PVDF binder Substances 0.000 claims abstract description 28
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 18
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- 238000000034 method Methods 0.000 claims description 28
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 18
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- 238000001035 drying Methods 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
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- 239000000243 solution Substances 0.000 abstract description 11
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- 150000003839 salts Chemical class 0.000 description 42
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- 239000002994 raw material Substances 0.000 description 31
- 229910052751 metal Inorganic materials 0.000 description 20
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- 239000011572 manganese Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 239000003513 alkali Substances 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 10
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical group [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 10
- 239000007774 positive electrode material Substances 0.000 description 10
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- 229910052808 lithium carbonate Inorganic materials 0.000 description 2
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- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 description 1
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- 230000035484 reaction time Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
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- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000011366 tin-based material Substances 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
Abstract
Description
Mg(NO3)2 + 2LiOH → Mg(OH)2 + 2LiNO3 ・・・(1)
リチウム金属複合酸化物は、電極活物質として用いられる化合物である。リチウム金属複合酸化物は、その酸化還元電位が比較的高いために、主に正極活物質として用いられることが多く、場合によっては負極活物質として用いられることもある。
接触工程では、リチウム金属複合酸化物を硝酸塩水溶液に接触させる。
・硝酸塩水溶液にリチウム金属複合酸化物を浸漬し、必要に応じて撹拌機などで撹拌する。その後、フィルターなどの濾過装置で層状化合物を硝酸塩水溶液から分離する。
・硝酸塩水溶液をリチウム金属複合酸化物にシャワー掛けする。
・硝酸塩水溶液の流水中にリチウム金属複合酸化物を置く。
混合工程では、上記の接触工程、及び必要に応じて乾燥工程を行ったリチウム金属複合酸化物に、結着剤としてのPVdFを混合して電極合剤を形成する。電極合剤は、流動性をもつスラリー状を呈している。
上記で製造された電極合剤が集電体の表面に塗布されることで、電極が形成される。集電体の表面に電極合剤を塗布する方法には、ロールコート法、ダイコート法、ディップコート法、ドクターブレード法、スプレーコート法、カーテンコート法などの従来から公知の方法が挙げられる。電極合剤は、集電体の表面に塗布後、乾燥する。溶剤としては、電極密度を高めるべく、乾燥後のものを圧縮しても良い。
上記のように本発明の製造方法により製造された電極は、他方の電極及び電解質とともに電池を構成する。上記のように本発明の製造方法により製造された電極は、正極として用いられることが多く、負極と電解質とともに電池を構成することができる。特に、二次電池を構成することができ、電解質として非水系電解液を用いる場合には非水系二次電池を構成することができる。
まず、溶融塩法で合成されたリチウム金属複合酸化物LiNi0.5Co0.2Mn0.3O2(NCM)を準備した。LiNi0.5Co0.2Mn0.3O2は、層状岩塩構造をもつ。LiNi0.5Co0.2Mn0.3O2(NCM)、導電助剤としてのアセチレンブラック(AB)、結着材としてのポリフッ化ビニリデン(PVdF)、N−メチル−2−ピロリドン(NMP)を、質量比で、NCM:AB:PVdF:NMP=54.2:1.8:3:41の割合で混合して、正極用スラリー(電極合剤)を作製した(混合工程)。得られた正極用スラリーは比較例1とした。
LiNi0.5Co0.2Mn0.3O2に、接触工程及び乾燥工程を行った。接触工程では、LiNi0.5Co0.2Mn0.3O2をMg(NO3)2水溶液で洗浄した。Mg(NO3)2水溶液は、水にMg(NO3)2を溶解させている。Mg(NO3)2水溶液のMg(NO3)2濃度は5mM(5mmol/L)であった。Mg(NO3)2水溶液(常温)0.2リットルをビーカーに入れた。Mg(NO3)2水溶液1リットル当たりLiNi0.5Co0.2Mn0.3O2を60g投入し、撹拌器で10分間撹拌した。
実施例2では、Mg(NO3)2水溶液のMg(NO3)2濃度が50mMである点を除いて、実施例1と同様に正極用スラリーを作成した。
実施例2では、Mg(NO3)2水溶液のMg(NO3)2濃度が100mMである点を除いて、実施例1と同様に正極用スラリーを作成した。
実施例2では、Mg(NO3)2水溶液のMg(NO3)2濃度が200mMである点を除いて、実施例1と同様に正極用スラリーを作成した。
実施例2では、Mg(NO3)2水溶液のMg(NO3)2濃度が500mMである点を除いて、実施例1と同様に正極用スラリーを作成した。
実施例1〜5及び比較例1の正極用スラリーの初期粘度と2日(48時間)経過後の粘度を測定した。粘度は、B型粘度計により測定した。その結果を表1に示した。表1において、「水溶液中のMg(NO3)2濃度」は、Mg(NO3)2水溶液1リットル当たりに溶解しているMg(NO3)2のモル濃度を示している。「初期粘度」は、リチウム金属複合酸化物に、AB、PVdF及びNMPを混合して正極用スラリーを作製した直後の正極用スラリーの粘度を示している。「2日後粘度」は、AB、PVdF及びNMPを混合して正極用スラリーを作製してから2日経過したときの正極用スラリーの粘度を示している。「粘度上昇率(%)」は、100×(2日後粘度―初期粘度)/初期粘度から算出される。
Claims (7)
- リチウム金属複合酸化物を、硝酸塩を有する硝酸塩水溶液に接触させる接触工程と、
接触工程を行ったリチウム金属複合酸化物を、ポリフッ化ビニリデン及び溶剤と混合する混合工程と、を有することを特徴とする電極合剤の製造方法。 - 前記硝酸塩は、Mg(NO3)2を有する請求項1記載の電極合剤の製造方法。
- 前記Mg(NO3)2水溶液1リットルの中のMg(NO3)2の濃度は、5mmol/L以上200mmol/L以下である請求項2記載の電極合剤の製造方法。
- 接触工程の後には、前記リチウム金属複合酸化物を乾燥させる乾燥工程を行う請求項1〜3のいずれか1項に記載の電極合剤の製造方法。
- 前記溶剤は、N−メチル−2−ピロリドンを有する請求項1〜4のいずれか1項に記載の電極合剤の製造方法。
- 前記リチウム金属複合酸化物は、層状岩塩構造を有する請求項1〜5のいずれか1項に記載の電極合剤の製造方法。
- 請求項1〜6のいずれか1項に記載の電極合剤の製造方法により製造された正極合剤を集電体に塗布することを特徴とする電極の製造方法。
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JP2003123755A (ja) * | 2001-10-12 | 2003-04-25 | Matsushita Electric Ind Co Ltd | 非水電解質二次電池用正極活物質およびその製造方法 |
WO2012073874A1 (ja) * | 2010-11-30 | 2012-06-07 | 三洋電機株式会社 | 非水電解質二次電池用導電剤、非水電解質二次電池用正極、及び非水電解液二次電池 |
JP2013503449A (ja) * | 2009-08-27 | 2013-01-31 | エンビア・システムズ・インコーポレイテッド | 金属酸化物でコーティングされたリチウム系電池用正極材料 |
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JP2003123755A (ja) * | 2001-10-12 | 2003-04-25 | Matsushita Electric Ind Co Ltd | 非水電解質二次電池用正極活物質およびその製造方法 |
JP2013503449A (ja) * | 2009-08-27 | 2013-01-31 | エンビア・システムズ・インコーポレイテッド | 金属酸化物でコーティングされたリチウム系電池用正極材料 |
WO2012073874A1 (ja) * | 2010-11-30 | 2012-06-07 | 三洋電機株式会社 | 非水電解質二次電池用導電剤、非水電解質二次電池用正極、及び非水電解液二次電池 |
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