WO2014132578A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- WO2014132578A1 WO2014132578A1 PCT/JP2014/000691 JP2014000691W WO2014132578A1 WO 2014132578 A1 WO2014132578 A1 WO 2014132578A1 JP 2014000691 W JP2014000691 W JP 2014000691W WO 2014132578 A1 WO2014132578 A1 WO 2014132578A1
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- negative electrode
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- nonaqueous electrolyte
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- 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
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- 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
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
- 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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery.
- Metal materials that can be alloyed with lithium such as silicon, germanium, tin and zinc instead of carbonaceous materials such as graphite as negative electrode active materials, and these metals for higher energy density and higher output of lithium ion batteries
- silicon, germanium, tin and zinc instead of carbonaceous materials such as graphite as negative electrode active materials, and these metals for higher energy density and higher output of lithium ion batteries
- carbonaceous materials such as graphite
- Patent Document 1 discloses a non-aqueous electrolyte secondary battery in which a film containing metallic lithium powder is formed on a negative electrode in order to compensate for irreversible capacity.
- the non-aqueous electrolyte secondary battery of Patent Document 1 has a problem that the initial charge / discharge efficiency and the cycle characteristics cannot be sufficiently improved.
- a non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a porous layer disposed on the negative electrode, a separator, and a non-aqueous electrolyte.
- a positive electrode a negative electrode
- a porous layer disposed on the negative electrode
- a separator a non-aqueous electrolyte.
- the flat voids included in the porous layer are formed by filling lithium ions in the negative electrode active material with flat lithium particles.
- the initial charge / discharge efficiency and the cycle characteristics can be improved.
- a nonaqueous electrolyte secondary battery which is an example of an embodiment of the present invention includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, a porous layer disposed on the negative electrode, and a nonaqueous solvent including a nonaqueous solvent.
- a water electrolyte and a separator are provided.
- the non-aqueous electrolyte secondary battery there is a structure in which an electrode body in which a positive electrode and a negative electrode are wound via a separator and a non-aqueous electrolyte are housed in an exterior body.
- the positive electrode is preferably composed of a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector.
- a positive electrode current collector for example, a conductive thin film, particularly a metal foil or alloy foil that is stable in the potential range of the positive electrode such as aluminum, or a film having a metal surface layer such as aluminum is used.
- the positive electrode active material layer preferably contains a conductive material and a binder in addition to the positive electrode active material.
- the positive electrode active material is not particularly limited, but is preferably a lithium-containing transition metal oxide.
- the lithium-containing transition metal oxide may contain non-transition metal elements such as Mg and Al. Specific examples include lithium-containing transition metal oxides such as lithium cobaltate, olivine-type lithium phosphate represented by lithium iron phosphate, Ni—Co—Mn, Ni—Mn—Al, and Ni—Co—Al. It is done. These positive electrode active materials may be used alone or in combination of two or more.
- carbon materials such as carbon black, acetylene black, ketjen black, graphite, and a mixture of two or more thereof can be used.
- binder polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl acetate, polyacrylonitrile, polyvinyl alcohol, and a mixture of two or more thereof can be used.
- the negative electrode preferably includes a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector.
- a negative electrode current collector for example, a conductive thin film, particularly a metal foil or alloy foil that is stable in the potential range of the negative electrode such as copper, or a film having a metal surface layer such as copper is used.
- the negative electrode active material layer preferably contains a binder in addition to the negative electrode active material.
- the binder polytetrafluoroethylene or the like can be used as in the case of the positive electrode, but styrene-butadiene rubber (SBR), polyimide, or the like is preferably used.
- SBR styrene-butadiene rubber
- the binder may be used in combination with a thickener such as carboxymethylcellulose.
- the negative electrode active material includes a metal material alloyed with lithium and an oxide of these metals.
- the negative electrode active material is a metal material whose volume change due to charge and discharge is alloyed with lithium and other negative electrode active materials smaller than oxides of these metals, such as graphite, from the viewpoint of achieving both higher capacity and improved cycle characteristics. It is preferable to use a mixture with a carbon material such as hard carbon.
- the covering layer is a conductive layer made of a material having higher conductivity than Si or SiO x .
- the conductive material constituting the coating layer is preferably an electrochemically stable material, and is preferably at least one selected from the group consisting of a carbon material, a metal, and a metal compound.
- the negative electrode active material is a mixture of a metal material that is alloyed with lithium or an oxide of these metals and a carbon material such as graphite or hard carbon
- the metal material that is alloyed with lithium or an oxide and carbon of these metals is used.
- the mass ratio with the material is preferably 1:99 to 20:80. If the mass ratio is within the range, it is easy to achieve both higher capacity and improved cycle characteristics.
- the ratio of the metal material alloyed with lithium or the oxide of these metals to the total mass of the negative electrode active material is lower than 1% by mass, the metal material alloyed with lithium or the oxide of these metals is added. This reduces the merit of higher capacity.
- the porous layer includes a flat void.
- the minor axis direction of the flat void has a direction substantially perpendicular to the surface direction of the porous layer, and the major axis direction has a direction substantially horizontal to the surface direction of the porous layer.
- the cross section of the flat void in the plane direction of the porous layer is substantially circular.
- the flat void is formed by arranging a layer including flat lithium particles on the negative electrode, and then electrochemically occluding lithium in the negative electrode active material, as illustrated in FIG. It is preferable to form a porous layer comprising
- the layer including flat lithium particles is preferably formed by rolling a layer including spherical lithium particles.
- the rolling conditions are not limited as long as the spherical lithium particles in the layer are deformed into flat lithium particles, but rolling is preferably performed under a linear pressure of 10 kgf / cm to 1000 kgf / cm.
- the ratio of the major axis to the minor axis of the flat gap is preferably 1.2 to 5.0 mm, more preferably 1.4 to 2.2 mm. If it is in the said range, the penetration rate of the electrolyte solution in the surface direction in the porous layer becomes faster, and the electrolyte solution acceptability in the surface direction becomes better. If the ratio of the major axis to the minor axis is too small, the electrolyte acceptability in the surface direction tends to decrease, and if too large, the shape of the porous layer tends to be difficult to maintain.
- the flat voids are preferably present in a concave shape on the surface of the porous layer on the side not facing the negative electrode. Due to the concave gap on the surface, the electrolyte acceptability is further improved.
- the flat void has an area ratio of 20 to 90%, more preferably 40 to 80% with respect to a cross section substantially perpendicular to the surface direction of the porous layer. If the area ratio is too small, the electrolyte acceptability in the surface direction tends to decrease, and if the area ratio is too large, the strength of the porous layer is weakened and the shape of the porous layer tends to be difficult to maintain. is there.
- the size of the flat gap is preferably 1 to 35 ⁇ m in the minor axis direction and 2 to 70 ⁇ m in the major axis direction.
- the surface of the flat void is preferably provided with an organic film. This is because when the layer containing lithium particles is formed, the deactivation reaction due to moisture in the air is suppressed when the surface of the lithium particles is covered with an organic film.
- the organic film is preferably composed of an electrochemically stable material that is not alloyed with lithium.
- it is preferably at least one selected from the group consisting of organic rubber, organic resin, and metal carbonate.
- the porous layer preferably contains a conductive material.
- a conductive material it is preferable to use a conductive material used for the positive electrode or the negative electrode.
- the conductive material is included in the porous layer, lithium supplementation to the negative electrode active material layer is likely to proceed.
- the thickness of the porous layer varies depending on the irreversible capacity of the negative electrode active material layer, and is adjusted as appropriate.
- the layer provided with lithium particles flat in the surface direction is formed on the negative electrode.
- the porous layer is preferably formed on the negative electrode.
- the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
- the nonaqueous electrolyte is not limited to a liquid electrolyte (nonaqueous electrolyte solution), and may be a solid electrolyte using a gel polymer or the like.
- Examples of non-aqueous solvents that can be used include esters, ethers, nitriles (acetonitrile, etc.), amides (dimethylformamide, etc.), and a mixture of two or more of these.
- esters examples include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate, butylene carbonate, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate (DEC), methyl propyl carbonate, ethyl propyl carbonate, methyl isopropyl carbonate, and the like.
- carboxylic acid esters such as chain carbonate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, and ⁇ -butyrolactone.
- ethers examples include cyclic ethers such as 1,3-dioxolane, tetrahydrofuran, 2-methyltetrahydrofuran, propylene oxide, 1,2-butylene oxide, 1,3-dioxane, furan, 1,8-cineol, , 2-dimethoxyethane, ethyl vinyl ether, ethyl phenyl ether, 1,2-diethoxyethane, 1,2-dibutoxyethane, diethylene glycol dimethyl ether, 1,1-dimethoxymethane, 1,1-diethoxyethane, triethylene glycol
- chain ethers such as dimethyl ether.
- non-aqueous solvent it is preferable to use at least a cyclic carbonate among the solvents exemplified above, and it is more preferable to use a cyclic carbonate and a chain carbonate in combination.
- the electrolyte salt is preferably a lithium salt.
- lithium salts include LiPF 6 , LiBF 4 , LiAsF 6 , LiN (SO 2 CF 3 ) 2 , LiN (SO 2 CF 5 ) 2 , LiPF 6-x (C n F 2n + 1 ) x (1 ⁇ x ⁇ 6, n is 1 or 2). These lithium salts may be used alone or in combination of two or more.
- the concentration of the lithium salt is preferably 0.8 to 1.8 mol per liter of the nonaqueous solvent.
- separator a porous sheet having ion permeability and insulating properties is used.
- the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric.
- material of the separator polyolefin such as polyethylene and polypropylene is suitable.
- Example 1 [Production of positive electrode] Lithium cobaltate, acetylene black, and polyvinylidene fluoride were mixed with an appropriate amount of N-methylpyrrolidone in a mixer so that the mass ratio was 100: 1.5: 1.5, to prepare a positive electrode mixture slurry.
- This positive electrode mixture slurry was applied to both sides of a positive electrode current collector sheet made of an Al foil having a thickness of 15 ⁇ m, dried, and after rolling, cut into a size corresponding to a battery case made of a predetermined laminate material.
- the positive electrode used with a lithium ion battery was obtained.
- the packing density of the positive electrode active material layer was 3.8 g / mL.
- SLMP manufactured by FMC (Preparation of a layer containing lithium particles)
- acetylene black, and polyvinylidene fluoride were mixed together with an appropriate amount of N-methylpyrrolidone with a mixer so that the mass ratio was 64:16:20 to prepare a slurry.
- This slurry was applied on the negative electrode active material layer and dried.
- SLMP manufactured by FMC is a spherical lithium particle having an organic film on the surface.
- Test Cell C1 A tab was attached to each of the electrodes, and the positive electrode and the negative electrode were spirally wound through a separator so that the tab was positioned on the outermost peripheral portion, thereby producing an electrode body.
- the electrode body is inserted into an exterior body made of an aluminum laminate sheet and vacuum-dried at 105 ° C. for 2 hours, and then the non-aqueous electrolyte is injected to seal the opening of the exterior body, and the test cell C1 Was made.
- the design capacity of the test cell C1 is 800 mAh.
- Example 1 After forming the layer containing lithium particles on the negative electrode active material layer, a test cell R1 was obtained in the same manner as in Example 1 except that rolling was not performed.
- Example 2 A test cell R2 was obtained in the same manner as in Example 1 except that the layer containing lithium particles was not formed on the negative electrode active material layer.
- C1 obtained by rolling a layer containing lithium particles is superior in initial charge and discharge efficiency and cycle characteristics to R1 which does not roll a layer containing lithium particles. This is because, in C1, since flat voids are formed in the surface direction in the porous layer, compared to R1 in which spherical voids are formed in the porous layer, the voids in the surface direction of the porous layer This is thought to be due to improved electrolyte acceptability.
- the negative electrode was taken out from the batteries C1 and R1 after the first charge / discharge, and a cross section in the thickness direction of the negative electrode (cross section perpendicular to the plane direction) was prepared using a cross section polisher, and SEM observation was performed. An area having a length of 1 mm was extracted from this cross section as a measurement area, and the area occupancy of the flat gap and the short axis and long axis of the gap were measured from the SEM image.
- Area occupancy total area of flat voids / (maximum thickness of porous layer in measurement region ⁇ 1 mm)
- Table 2 shows the average values of the area occupancy ratio, the minor axis, the major axis, and the ratio of the minor axis to the major axis.
- the minimum value of the ratio between the short axis and the long axis in C1 was 1.4, and the maximum value was 2.2.
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Abstract
Description
実施形態の説明で参照する図面は、模式的に記載されたものであり、図面に描画された構成要素の寸法比率などは、現物と異なる場合がある。具体的な寸法比率等は、以下の説明を参酌して判断されるべきである。本明細書において「略**」とは、「略同等」を例に挙げて説明すると、全く同一はもとより、実質的に同一と認められるものを含む意図である。
正極は、正極集電体と、正極集電体上に形成された正極活物質層とで構成されることが好適である。正極集電体には、例えば、導電性を有する薄膜体、特にアルミニウムなどの正極の電位範囲で安定な金属箔や合金箔、アルミニウムなどの金属表層を有するフィルムが用いられる。正極活物質層は、正極活物質の他に、導電材及び結着剤を含むことが好ましい。
負極は、負極集電体と、負極集電体上に形成された負極活物質層とを備えることが好適である。負極集電体には、例えば、導電性を有する薄膜体、特に銅などの負極の電位範囲で安定な金属箔や合金箔、銅などの金属表層を有するフィルムが用いられる。負極活物質層は、負極活物質の他に、結着剤を含むことが好適である。結着剤としては、正極の場合と同様にポリテトラフルオロエチレン等を用いることもできるが、スチレン-ブタジエンゴム(SBR)やポリイミド等を用いることが好ましい。結着剤は、カルボキシメチルセルロース等の増粘剤と併用されてもよい。
ことが好適である。
以下、多孔質層について詳説する。
図1に例示するように、多孔質層は、扁平な空隙を備える。上記扁平な空隙の短軸方向は多孔質層の面方向に略垂直な方向を有し、長軸方向は多孔質層の面方向に略水平な方向を有する。なお、扁平な空隙の、多孔質層の面方向に水平な断面は、略円状である。
非水電解質は、非水溶媒と、非水溶媒に溶解した電解質塩とを含む。非水電解質は、液体電解質(非水電解液)に限定されず、ゲル状ポリマー等を用いた固体電解質であってもよい。非水溶媒には、例えば、エステル類、エーテル類、ニトリル類(アセトニトリル等)、アミド類(ジメチルホルムアミド等)、及びこれらの2種以上の混合溶媒などを用いることができる。
セパレータには、イオン透過性及び絶縁性を有する多孔性シートが用いられる。多孔性シートの具体例としては、微多孔薄膜、織布、不織布等が挙げられる。セパレータの材質としては、ポリエチレン、ポリプロピレン等のポリオレフィンが好適である。
[正極の作製]
コバルト酸リチウム、アセチレンブラック及びポリフッ化ビニリデンを質量比で100:1.5:1.5となるように、適量のN-メチルピロリドンとともにミキサーで混合し、正極合剤スラリーを調製した。この正極合剤スラリーを厚さ15μmのAl箔からなる正極集電体シートの両面に塗布し、乾燥させ、圧延後に所定のラミネート材製の電池ケースに対応する大きさに裁断し、実験例1のリチウムイオン電池で使用する正極を得た。正極活物質層の充填密度は、3.8g/mLであった。
(負極活物質層の作製)
導電性炭素材料で被覆された平均粒径(D50)6μmのSiO粒子と、平均粒径(D50)25μmの黒鉛と、カルボキシメチルセルロースと、スチレンブタジエンラバーとを、質量比で10:90:1:1となるように、適量の水とともにミキサーで混合し、負極合剤スラリーを調製した。この負極合剤スラリーを厚さ10μmの銅箔からなる負極集電体シートの両面に塗布し、乾燥させ、圧延した。負極活物質層の充填密度は、1.60g/mLであった。
FMC社製SLMPと、アセチレンブラック及びポリフッ化ビニリデンを質量比で64:16:20となるように、適量のN-メチルピロリドンとともにミキサーで混合し、スラリーを調製した。このスラリーを、負極活物質層上に塗布し、乾燥させた。なお、FMC社製SLMPは、表面に有機物膜を備える球状のリチウム粒子である。
負極上に形成し乾燥させたリチウム粒子を含む層を、直径65mmのロールの間を300kgf/cmの線圧を印加して圧延した。所定のラミネート材製の電池ケースに対応する大きさに裁断し、実験例1のリチウムイオン電池で使用する負極を得た。
EC:DEC=3:7(容積比)となるように混合した非水溶媒に、LiPF6を1.0mol/Lとなるように添加して非水電解液を調製した。
上記各電極にタブをそれぞれ取り付け、タブが最外周部に位置するようにセパレータを介して上記正極及び上記負極を渦巻き状に巻回して電極体を作製した。当該電極体をアルミニウムラミネートシートで構成される外装体に挿入して、105℃で2時間真空乾燥した後、上記非水電解液を注入し、外装体の開口部を封止して試験セルC1を作製した。なお、試験セルC1の設計容量は800mAhである。
負極活物質層上へのリチウム粒子を含む層の形成後、圧延を行わなかったこと以外は、実施例1と同様にして試験セルR1を得た。
負極活物質層上へリチウム粒子を含む層を形成しなかったこと以外は、実施例1と同様にして試験セルR2を得た。
電池C1、R1及びR2について、初回充放電効率及びサイクル特性の評価を行い、表1に示した。
・充電;0.5Itの電流で電圧が4.3Vになるまで定電流充電を行い、その後電圧が4.3Vで0.05Itの電流になるまで定電圧充電を行った。
・放電;0.2Itの電流で電圧が2.75Vになるまで定電流放電を行った。
・休止;上記充電と上記放電との間の休止時間は10分とした。
1サイクル目の充電容量に対する1サイクル目の放電容量の割合を、初回充放電効率とした。
初回充放電効率(%)
=(1サイクル目の放電容量/1サイクル目の充電容量)×100
上記充放電条件で各試験セルについてサイクル試験を行った。
1サイクル目の放電容量に対する50サイクル目の放電容量の割合を、サイクル特性とした。
サイクル特性(%)
=(50サイクル目の放電容量/1サイクル目の放電容量)×100
初回充放電後の電池C1、R1から負極を取り出し、クロスセクションポリッシャを用いて、負極の厚み方向の断面(面方向に垂直な断面)を作製し、SEM観察を行った。この断面のうち、1mmの長さの領域を測定領域として抜き出し、扁平状の空隙の面積占有率および空隙の短軸、長軸をSEM画像より測定した。
面積占有率
=扁平状の空隙の総面積/(測定領域内における多孔質層の最大厚み × 1mm)
面積占有率、短軸、長軸および短軸と長軸の比率の平均値を表2に示した。C1における短軸と長軸の比率の最小値は1.4であり、最大値は2.2であった。
Claims (5)
- 非水電解質二次電池であって、
正極と、負極と、前記負極上に配置された多孔質層と、セパレータと、非水電解質と、を備え、
前記多孔質層は、扁平な空隙を備え、
前記扁平な空隙の短軸方向は多孔質層の面方向に垂直であり、長軸方向は多孔質層の面方向に水平である、非水電解質二次電池。 - 請求項1に記載の非水電解質二次電池であって、
前記空隙の、前記短軸に対する前記長軸の比が、1.4~2.2である、非水電解質二次電池。 - 請求項1または請求項2のいずれか1項に記載の非水電解質二次電池であって、
前記空隙が、前記多孔質層の負極と対向していない側の表面上に、凹状に存在する、非水電解質二次電池。 - 請求項1~請求項3のいずれか1項に記載の非水電解質二次電池であって、
前記多孔質層の面方向に垂直な断面における、前記空隙の占める面積比率が40~80%である、非水電解質二次電池。 - 請求項1~請求項4のいずれか1項に記載の非水電解質二次電池であって、
前記空隙の表面は、有機物膜を備える、非水電解質二次電池。
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US14/761,740 US9947928B2 (en) | 2013-02-28 | 2014-02-10 | Nonaqueous electrolyte secondary battery |
CN201480010974.6A CN105027329B (zh) | 2013-02-28 | 2014-02-10 | 非水电解质二次电池 |
JP2015502744A JP6414545B2 (ja) | 2013-02-28 | 2014-02-10 | 非水電解質二次電池 |
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