JP7267269B2 - リチウム金属二次電池及びそれを含む電池モジュール - Google Patents
リチウム金属二次電池及びそれを含む電池モジュール Download PDFInfo
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- JP7267269B2 JP7267269B2 JP2020520608A JP2020520608A JP7267269B2 JP 7267269 B2 JP7267269 B2 JP 7267269B2 JP 2020520608 A JP2020520608 A JP 2020520608A JP 2020520608 A JP2020520608 A JP 2020520608A JP 7267269 B2 JP7267269 B2 JP 7267269B2
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- pressure
- lithium metal
- secondary battery
- metal secondary
- charging
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Classifications
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H01M4/044—Activating, forming or electrochemical attack of the supporting material
- H01M4/0445—Forming after manufacture of the electrode, e.g. first charge, cycling
- H01M4/0447—Forming after manufacture of the electrode, e.g. first charge, cycling of complete cells or cells stacks
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- H01—ELECTRIC ELEMENTS
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
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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
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Description
負極、正極、及び前記負極と前記正極との間に介在されるセパレータを含む電極組立体と、
前記電極組立体に含浸される非水電解液と、
前記電極組立体及び前記非水電解液を収納する電池ケースとを含むリチウム金属二次電池であって、
前記負極は、負極集電体及び前記負極集電体の少なくとも一面上に形成されたリチウム金属層を含み、
前記リチウム金属二次電池の充放電条件が、加圧状態で充電され、未加圧状態または加圧状態で放電する条件であって、前記加圧状態で放電する場合、放電時に加えられた圧力が充電時に加えられた圧力よりも小さく制御されるリチウム金属二次電池に関する。
前記充電時に加えられる圧力が3~150psiであるリチウム金属二次電池に関する。
前記充電時に加えられる圧力が40~100psiであるリチウム金属二次電池に関する。
前記加圧状態で放電する場合、前記放電時に加えられる圧力が1~10psiであるリチウム金属二次電池に関する。
前記充電時の電流密度が0.01~4mA/cm2であるリチウム金属二次電池に関する。
前記充電時の電流密度が0.05~3.5mA/cm2であるリチウム金属二次電池に関する。
前記充電時の温度が25~45℃であるリチウム金属二次電池に関する。
25~45℃の温度、40~100psiの加圧状態、0.05~3.5mA/cm2の充電電流密度で充電され、未加圧または1~10psiの加圧状態で放電したリチウム金属二次電池に関する。
パウチ型リチウム金属二次電池であるリチウム金属二次電池に関する。
複数の単位セル及び前記複数の単位セルを収納するモジュールケースを含む電池モジュールであって、
前記単位セルが第1具現例~第9具現例のうちいずれか一具現例に記載のリチウム金属二次電池である電池モジュールに関する。
前記リチウム金属二次電池がパウチ型リチウム金属二次電池である電池モジュールに関する。
前記モジュールケースがゴム素材を含む電池モジュールに関する。
前記モジュールケースの前記単位セルの大面積面と当接する部分がゴム素材からなる電池モジュールに関する。
(1)正極の製造
正極活物質として95重量部のLiNi1/3Mn1/3Co1/3O2、導電材として2.5重量部のスーパーP、及びバインダーとして2.5重量部のポリフッ化ビニリデン(PVdF)を、溶剤であるN-メチルピロリドン(NMP)に添加して正極活物質スラリーを製造した後、前記正極活物質スラリーをアルミニウム集電体の一面に65μmの厚さでコーティングし、それを乾燥及び圧延してから一定サイズで打ち抜いて正極を製造した。
厚さ10μmの銅集電体の一面に20μm厚さのリチウム金属ホイルを貼り付けて負極を製造した。
上記のように製造した正極と負極との間に、セパレータ(ポリエチレン系多孔性高分子基材の両面に、アルミナとPVdFバインダーとの混合物から形成された多孔性コーティング層を形成)を介在させた電極組立体を、パウチ型電池ケースに挿入した。その後、前記電池ケースにフルオロエチレンカーボネート(FEC)とエチルメチルカーボネート(EMC)とを30:70の体積比で混合した溶媒に、添加剤としてビニレンカーボネート(VC)1重量%と、1M LiPF6が溶解された電解液を注入した。次いで、完全に密封することでリチウム金属二次電池を製造した。
上記のように製造したリチウム金属二次電池を、下記表1に示されたように充放電加圧条件を変化させて、定電流/定電圧(CC/CV)条件で4.25Vまで充電した後、電流密度2mA/cm2で定電流(CC)条件で3Vまで放電した(放電温度25℃)。このような充/放電過程を50サイクル繰り返して行い、測定した容量維持率を表1に示した。
Claims (5)
- リチウム金属二次電池の充放電方法であって、
前記リチウム金属二次電池が、
負極、正極、及び前記負極と前記正極との間に介在されるセパレータを含む電極組立体と、
前記電極組立体に含浸される非水電解液と、
前記電極組立体及び前記非水電解液を収納する電池ケースと、を含み、
前記負極は、負極集電体及び前記負極集電体の少なくとも一面上に形成されたリチウム金属層を含み、
前記リチウム金属二次電池の充放電条件が、加圧状態で充電され、未加圧状態で放電する条件であり、
前記充電時に加えられる圧力が40~100psiであり、
前記充電時の電流密度が0.01~4mA/cm2であり、
前記加圧状態が、定圧加圧型、又は、定圧/定位混合型の加圧方式で制御され、
前記定圧加圧型の加圧方式は、前記リチウム金属二次電池が載置される載置部材と、前記リチウム金属二次電池を介在して前記載置部材と対向し、前記載置部材との距離を変更自在に設けられた加圧部材と、前記加圧部材を前記載置部材に向かって押すか又は引くことで、前記載置部材に載置されたリチウム金属二次電池を厚さ方向に加圧する加圧手段と、時間間隔を置いて前記加圧部材に印加される加圧力及び前記載置部材と加圧部材との距離を測定する測定手段と、時間間隔を置いて前記測定手段から加圧力測定値及び前記載置部材と加圧部材との距離測定値の入力を受け、前記加圧手段によって前記加圧部材に印加される加圧力を一定に維持するように、前記載置部材と加圧部材との距離を一定に維持するか又は変化させる制御部と、を備えた加圧装置によって行われる、リチウム金属二次電池の充放電方法。 - 前記充電時の電流密度が0.05~3.5mA/cm2である、請求項1に記載のリチウム金属二次電池の充放電方法。
- 前記充電時の温度が25~45℃である、請求項1又は2に記載のリチウム金属二次電池の充放電方法。
- 25~45℃の温度、40~100psiの加圧状態、0.05~3.5mA/cm2の充電電流密度で充電され、未加圧または1~10psiの加圧状態で放電した、請求項1から3の何れか一項に記載のリチウム金属二次電池の充放電方法。
- パウチ型リチウム金属二次電池である、請求項1から4の何れか一項に記載のリチウム金属二次電池の充放電方法。
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JP2020537309A (ja) | 2020-12-17 |
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