WO2014068930A1 - 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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- WO2014068930A1 WO2014068930A1 PCT/JP2013/006326 JP2013006326W WO2014068930A1 WO 2014068930 A1 WO2014068930 A1 WO 2014068930A1 JP 2013006326 W JP2013006326 W JP 2013006326W WO 2014068930 A1 WO2014068930 A1 WO 2014068930A1
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- positive electrode
- active material
- secondary battery
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- electrode active
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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
- H01M10/058—Construction or manufacture
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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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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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
- H01M4/62—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
- 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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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
- 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
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery in which the positive electrode active material content in the positive electrode mixture layer is increased.
- High energy density as a driving power source for portable electronic devices such as today's mobile phones, portable personal computers, portable music players, as well as power sources for hybrid electric vehicles (HEV, PHEV) and electric vehicles (EV)
- HEV hybrid electric vehicles
- PHEV PHEV
- EV electric vehicles
- Non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries having a high capacity are widely used.
- These non-aqueous electrolyte secondary batteries generally include a positive electrode plate in which a positive electrode mixture layer including a positive electrode active material that occludes and releases lithium ions is formed on both surfaces of a positive electrode core made of an elongated sheet-like aluminum foil. And a negative electrode plate in which a negative electrode mixture layer containing a negative electrode active material that absorbs and releases lithium ions is formed on both sides of a negative electrode core made of an elongated sheet-like copper foil.
- These non-aqueous electrolyte secondary batteries are wound in a cylindrical or elliptical shape with the positive electrode plate and the negative electrode plate insulated from each other via a separator as disclosed in, for example, Patent Document 1 below.
- Non-aqueous electrolyte secondary batteries have a high energy density and a high capacity, and therefore there is a constant demand for improvement in battery capacity per volume or mass.
- As a method for increasing the battery capacity per volume or mass of the non-aqueous electrolyte secondary battery there is a method of increasing the content of the active material in the active material mixture layer formed on the electrode plate.
- an increase in the content of the active material means that the contents of the conductive agent and the binder are relatively reduced, so that the state of the battery electrode plate is made normal in proportion to the increase in the content of the active material. The difficulty of keeping increases.
- PVdF polyvinylidene fluoride
- Patent Document 2 discloses a positive electrode mixture paste for a lithium secondary battery containing a PVdF-based resin having a carboxyl group and a lithium secondary battery using the paste. There is no suggestion about increasing the content to 95% by mass or more and the cycle characteristics at that time.
- a positive electrode plate in which a positive electrode active material layer that occludes and releases lithium ions, a conductive agent, and a binder is formed, and a lithium ion that is occluded /
- the content of the positive electrode active material in the layer is 97% by mass or more, and the content ratio of the conductive agent and the binder in the positive electrode mixture layer is 1.00 to 1.67
- a non-aqueous electrolyte secondary battery is provided in which the binder is PVdF having a carboxyl group or a carboxyl group derivative as a terminal functional group.
- the nonaqueous electrolyte secondary battery of one embodiment of the present invention even when the content of the positive electrode active material in the positive electrode mixture layer is 97% by mass or more, the high capacity nonaqueous electrolyte secondary battery with improved cycle characteristics is obtained. A secondary battery is obtained.
- FIG. 1 is a perspective view of a laminated nonaqueous electrolyte secondary battery according to an embodiment.
- FIG. 2 is a perspective view of the wound electrode body of FIG.
- the positive electrode active material made of lithium cobalt composite oxide (LiCoO 2 ) used in Experimental Examples 1 to 10 and 13 to 15 was prepared as follows.
- As the cobalt source tricobalt tetroxide (Co 3 O 4 ) obtained by thermal decomposition reaction of cobalt carbonate (CoCO 3 ) was used. This was mixed with lithium carbonate (Li 2 CO 3 ) as a lithium source and fired at 850 ° C. for 20 hours in an air atmosphere to obtain a lithium cobalt composite oxide. This was ground to an average particle size of 14 ⁇ m with a mortar.
- the positive electrode active material composed of lithium-nickel-manganese composite oxide containing cobalt used in Experimental Example 11 and 12 was prepared as follows.
- lithium carbonate (Li 2 CO 3 ) was used as a lithium source, and a coprecipitated hydroxide represented by Ni 0.5 Co 0.2 Mn 0.3 (OH) 2 was used as a transition metal source.
- NMP N-methyl-2-pyrrolidone
- methylcellulose is mixed in advance with a part of the NMP solution, and further a conductive agent is mixed to prepare a paste.
- a positive electrode active material and a binder were added and mixed, and finally the rest of the NMP solution was added and mixed to form a slurry.
- the positive electrode active material mixture slurry obtained as described above was applied to both surfaces of a 15 ⁇ m thick aluminum positive electrode current collector with a uniform thickness by the doctor blade method, and then passed through a dryer to dry NMP. By removing, a positive electrode mixture layer was formed on the positive electrode current collector. Thereafter, this positive electrode plate was rolled by a roll press and cut into a predetermined size to produce positive electrode plates used in Experimental Examples 1 to 15.
- the negative electrode plate common to Experimental Examples 1 to 12, 14, and 15 was produced as follows. Graphite powder as a negative electrode active material, carboxymethyl cellulose (CMC) as a thickener, and styrene butadiene rubber (SBR) as a binder are uniformly mixed in a ratio of 95: 3: 2 (mass ratio). Then, it was dispersed in an appropriate amount of water to prepare a negative electrode active material mixture slurry. The negative electrode active material mixture slurry was applied to both surfaces of a negative electrode current collector made of copper foil having a thickness of 10 ⁇ m by a doctor blade method, and then passed through a drier to dry and remove water, thereby removing the negative electrode current collector. Negative electrode active material mixture layers were formed on both sides. Thereafter, the negative electrode plate was rolled with a roll press and cut into a predetermined size to produce a negative electrode plate commonly used in Experimental Examples 1 to 12, 14, and 15.
- CMC carboxymethyl cellulose
- SBR styrene
- the presence or absence of the carbon material coating treatment on the surface of SiOx and the treatment temperature during the carbon material coating treatment are arbitrary.
- a carbon material is coated on the surface of SiOx, a known method may be used as it is.
- the coating amount is more preferably 1% by mass or more in the silicon oxide particles including the carbon material.
- the average particle size of SiO was measured using a laser diffraction particle size distribution analyzer (SALD-2000A manufactured by Shimadzu Corporation), using water as a dispersion medium and a refractive index of 1.70-0.01i.
- SALD-2000A laser diffraction particle size distribution analyzer
- the average particle size was a particle size at which the cumulative particle amount on a volume basis was 50%.
- This negative electrode active material mixture slurry was applied to both sides of a copper current collector having a thickness of 8 ⁇ m by a doctor blade method to form a negative electrode active material mixture layer, then dried to remove moisture, and then compressed.
- the negative electrode plate used in Experimental Example 13 was produced by rolling to a predetermined thickness using a roller and cutting to a predetermined size.
- the current collector tabs are welded to the positive electrode plate and the negative electrode plate according to each experimental example produced as described above, and then wound with a separator made of a polyethylene microporous film having a thickness of 12 ⁇ m interposed therebetween.
- a flat wound electrode body according to each experimental example was produced by winding with a machine, attaching an insulating winding stop tape to the winding end portion, and pressing.
- non-aqueous electrolyte solution As a non-aqueous electrolyte solution, as an electrolyte salt, a non-aqueous solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed so that the volume ratio at 1 atm and 25 ° C. is 70:30. Of lithium hexafluorophosphate (LiPF 6 ) was dissolved at 1 mol / L to prepare a non-aqueous electrolyte commonly used in Experimental Examples 1 to 15.
- EC ethylene carbonate
- MEC methyl ethyl carbonate
- the flat wound electrode body and the nonaqueous electrolyte were inserted into the cup-shaped electrode body storage space in a glove box under an argon atmosphere. Thereafter, the inside of the laminate exterior body was decompressed to impregnate the separator with a nonaqueous electrolyte, and the opening of the laminate exterior body was sealed.
- a nonaqueous electrolyte secondary battery having a height of 62 mm, a width of 35 mm, and a thickness of 3.6 mm (a dimension excluding the sealing portion) was produced.
- the design capacity of the obtained nonaqueous electrolyte secondary battery was 800 mAh with a charge end voltage of 4.50 V (lithium reference).
- a laminate-type nonaqueous electrolyte secondary battery 10 includes a laminate outer body 12, a positive electrode plate and a negative electrode plate, and is connected to a spirally wound electrode body 14 and a positive electrode plate of the spirally wound electrode body 14. And the negative electrode current collecting tab 18 connected to the negative electrode plate of the wound electrode body 14.
- the wound electrode body 14 has a positive electrode plate, a negative electrode plate, and a separator each having a strip shape, and is configured such that the positive electrode plate and the negative electrode plate are wound in a state of being insulated from each other via the separator. Yes.
- a concave portion 22 is formed in the laminate outer package 12, and one end side of the laminate outer package 12 is folded back so as to cover the opening portion of the concave portion 22.
- the end portion 24 around the concave portion 22 is folded and welded to the opposite portion, so that the inside of the laminate outer package 12 is sealed.
- a wound electrode body 14 is accommodated in the sealed laminate outer body 12 together with a non-aqueous electrolyte.
- the positive electrode current collecting tab 16 and the negative electrode current collecting tab 18 are arranged so as to protrude from the laminated outer package 12 sealed with the resin member 26, respectively. The electric power is supplied to the outside through this.
- a resin member 26 is disposed between each of the positive electrode current collecting tab 16 and the negative electrode current collecting tab 18 and the laminate outer package 12 for the purpose of improving adhesion and preventing a short circuit through the aluminum alloy layer of the laminate material. .
- the battery swelling after the high temperature cycle is dramatically suppressed.
- the content ratio of the conductive agent and the binder is 1.00 to about 100% by mass if the positive electrode active material content in the positive electrode mixture is 97% by mass or more. It can be seen that 1.67 is preferable.
- compositions of the positive electrode mixture layers of Experimental Examples 14 and 15 shown in Table 4 are the same as those of Experimental Example 4 and except that NMP solution does not contain methylcellulose as a dispersant when preparing the positive electrode active material mixture slurry.
- 1 is the same as the composition of the positive electrode mixture layer.
- the positive electrode plate surface resistance of Experimental Example 14 is significantly higher than that of Experimental Example 4, and the positive electrode plate surface resistance of Experimental Example 15 is significantly higher than that of Experimental Example 1. This indicates that the magnitude of the positive electrode plate surface resistance can be taken as an index of the dispersibility of the conductive agent.
- the surface resistance of the positive electrode plate is preferably 900 ⁇ or less. If the surface resistance is greater than 900 ⁇ , the resistance is so large that it is difficult to smoothly occlude / release lithium in the positive electrode active material, leading to a decrease in cycle characteristics as shown in Experimental Examples 14 and 15.
- Examples 1 to 9 and 11 to 15 described above examples in which carboxyl group-containing PVdF was used as a binder were shown, but carboxyl group derivative-containing PVdF can also be used.
- Examples 1 to 11 and 13 described above examples using methyl cellulose as the dispersant were shown, but water-soluble cellulose esters such as hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose, and polyvinyl propanol can also be used.
- lithium cobalt composite oxide and cobalt-containing lithium nickel manganese composite oxide were used as the positive electrode active material.
- the lithium transition represented by LiMO 2 (wherein M is at least one of Co, Ni, and Mn) capable of reversibly occluding and releasing lithium ions as the positive electrode active material.
- a lithium cobalt composite oxide added with different metal elements such as zirconium, magnesium, and aluminum can be used.
- Examples 1 to 15 the examples using graphite and silicon oxide composite graphite as the negative electrode active material were shown.
- the material is not particularly limited as long as it can reversibly store and release lithium.
- titanium oxides such as LiTiO 2 and TiO 2
- metalloid elements such as silicon and tin, Sn—Co alloys, and the like can be used.
- nonaqueous solvent examples include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC), and fluorinated cyclic esters.
- cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC)
- fluorinated cyclic esters examples include fluorinated cyclic esters.
- Carbonic acid esters such as ⁇ -butyrolactone ( ⁇ -BL), ⁇ -valerolactone ( ⁇ -VL), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), methyl propyl carbonate (MPC), chain carbonates such as dibutyl carbonate (DBC), fluorinated chain carbonates, chain carboxylates such as methyl pivalate, ethyl pivalate, methyl isobutyrate, methyl propionate, N, N'-dimethylformamide Amide compounds such as N- methyl-oxazolidinone, sulfur compounds such as sulfolane, etc.
- ⁇ -BL ⁇ -butyrolactone
- ⁇ -VL dimethyl carbonate
- EMC ethyl methyl carbonate
- DEC diethyl carbonate
- MPC methyl propyl carbonate
- chain carbonates such as dibutyl carbonate (DBC)
- ambient temperature molten salt such as tetrafluoroboric acid 1-ethyl-3-methylimidazolium
- molten salt such as tetrafluoroboric acid 1-ethyl-3-methylimidazolium
- a lithium salt generally used as an electrolyte salt in a nonaqueous electrolyte secondary battery can be used as an electrolyte salt dissolved in a nonaqueous solvent.
- Such lithium salts include LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , LiN (CF 3 SO 2 ) (C 4 F 9 SO 2 ), LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO 2 ) 3 , LiAsF 6 , LiClO 4 , Li 2 B 10 Cl 10 , Li 2 B 12 Cl 12 , and mixtures thereof Illustrated.
- LiPF 6 lithium hexafluorophosphate
- the amount of electrolyte salt dissolved in the non-aqueous solvent is preferably 0.8 to 1.5 mol / L.
- Examples 1 to 15 described above an example of a laminated nonaqueous electrolyte secondary battery was shown in order to allow a good confirmation of the increase in battery thickness, but the present invention uses a metal outer can.
- the present invention can also be applied to the cylindrical nonaqueous electrolyte secondary battery and the rectangular nonaqueous electrolyte secondary battery.
- Nonaqueous electrolyte secondary battery 12 Laminate exterior body 14: Winding electrode body 16: Positive electrode current collection tab 18: Negative electrode current collection tab 22: Recessed part 24: End part 26: Resin member
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Abstract
Description
実験例1~10、13~15で使用したリチウムコバルト複合酸化物(LiCoO2)からなる正極活物質は次のようにして調製した。コバルト源としては、炭酸コバルト(CoCO3)を熱分解反応させて得た四酸化三コバルト(Co3O4)を用いた。これに、リチウム源としての炭酸リチウム(Li2CO3)を混合し、空気雰囲気下において850℃で20時間焼成して、リチウムコバルト複合酸化物を得た。これを乳鉢で平均粒径14μmまで粉砕した。
実験例1~12、14、15に共通する負極極板は次のようにして作製した。負極活物質としての黒鉛粉末と、増粘剤としてのカルボキシメチルセルロース(CMC)と、結着剤としてのスチレンブタジエンゴム(SBR)とを、95:3:2(質量比)の割合で均一に混合した後、適量の水に分散させて負極活物質合剤スラリーを調製した。この負極活物質合剤スラリーを厚さ10μmの銅箔製の負極集電体の両面に、ドクターブレード法により塗布した後、乾燥機内に通して水を乾燥除去することで、負極集電体の両面に負極活物質合剤層を形成した。その後、負極極板をロールプレス機によって圧延し、所定の大きさに切り出して、実験例1~12、14、15で共通して使用する負極極板を作製した。
実験例13の負極極板は次のようにして作製した。
(1)酸化ケイ素負極活物質の調製
組成がSiOx(x=1)の粒子を粉砕・分級して平均粒子径が6μmとなるように粒度を調整した後、約1000℃に昇温し、アルゴン雰囲気下でCVD法によりこの粒子の表面を炭素で被覆した。そして、これを解砕・分級して酸化ケイ素負極活物質を調製した。
核となる鱗片状人造黒鉛と、この核の表面を被覆して非晶質炭素となる炭素前駆体としての石油ピッチとを準備した。これらを不活性ガス雰囲気下で加熱しながら混合し、焼成した。その後、粉砕・分級して、平均粒径が22μmであり、表面が非晶質炭素で被覆された黒鉛を調製した。
上述のようにして調製された黒鉛と酸化ケイ素とを質量比で96.5:3.5となるように混合したシリコン酸化物複合黒鉛を負極活物質として用いた。この負極活物質と、増粘剤としてのカルボキシメチルセルロース(CMC)と、結着剤としてのスチレンブタジエンゴム(SBR)とを、負極活物質(黒鉛+SiO):CMC:SBRの質量比が97:1.5:1.5となるように水に分散させて負極活物質合剤スラリーを調製した。この負極活物質合剤スラリーを、厚さ8μmの銅製の集電体の両面にドクターブレード法により塗布して負極活物質合剤層を形成し、次いで、乾燥して水分を除去した後、圧縮ローラーを用いて所定厚さに圧延し、所定サイズに裁断して、実験例13で使用する負極極板を作製した。
上記のようにして作製された各実験例に係る正極極板と負極極板とにそれぞれ集電タブを溶接した後、厚さ12μmのポリエチレン製微多孔膜からなるセパレータを間に挟んで巻き取り機により巻回し、巻回終端部に絶縁性の巻き止めテープを取り付け、プレスすることによって、各実験例に係る偏平状の巻回電極体を作製した。
非水電解液としては、エチレンカーボネ一ト(EC)及びメチルエチルカーボネート(MEC)を、1気圧、25℃での体積比で70:30となるよう混合した非水溶媒に、電解質塩としてのヘキサフルオロリン酸リチウム(LiPF6)を1mol/Lとなるように溶解させ、実験例1~15で共通して使用する非水電解液を調製した。
上記のようにして作製した正極極板及び負極極板を、ポリエチレン製微多孔質膜からなるセパレータを介して巻回し、最外周にポリプロピレン製のテープを張り付けて円筒状の巻回電極体を作製した。次いで、これをプレスして偏平状の巻回電極体とした。また、樹脂層(ポリプロピレン)/接着剤層/アルミニウム合金層/接着剤層/樹脂層(ポリプロピレン)の5層構造からなるシート状のラミネート材を用意し、このラミネート材を折り返して底部を形成するとともにカップ状の電極体収納空間を形成した。次いで、アルゴン雰囲気下のグローブボックス内で偏平状の巻回電極体と非水電解質とをカップ状の電極体収納空間に挿入した。この後、ラミネート外装体内部を減圧してセパレータ内部に非水電解質を含浸させ、ラミネート外装体の開口部を封止した。このようにして、高さ62mm、幅35mm、厚み3.6mm(封止部を除外した寸法)の非水電解質二次電池を作製した。得られた非水電解質二次電池の設計容量は、充電終止電圧が4.50V(リチウム基準)で、800mAhであった。
ここで、実験例1~15に共通するラミネート形非水電解質二次電池の構成について、図1を用いて説明する。ラミネート形非水電解質二次電池10は、ラミネート外装体12と、正極板と負極板とを備え、偏平状に形成された巻回電極体14と、この巻回電極体14の正極板に接続された正極集電タブ16と、この巻回電極体14の負極板に接続された負極集電タブ18とを有している。巻回電極体14は、それぞれが帯状である正極板、負極板及びセパレータを有し、正極板と負極板とがセパレータを介して互いに絶縁された状態で巻回されるようにして構成されている。
以上のようにして得られた実験例1~14に係る非水電解質二次電池について、それぞれ以下の充放電試験により高温充放電サイクル後の容量維持率を測定した。まず、50℃において、1It(=800mA)の定電流で電池電圧が4.4V(正極電位はリチウム基準で4.5V)となるまで充電し、電池電圧が4.4Vに達した後は4.4Vの定電圧で1/50It(=16mA)となるまで充電を行った。そして、1It(=800mA)の定電流で電池電圧が2.75Vになるまで放電し、電池電圧が2.75Vに達した後の電池厚みD1を測定した。
実験例1、4、13及び14については、正極極板作製後20mm×50mmのサイズに切り出して2端子法で電気抵抗を測定することで、正極極板表面の電気抵抗を測定した。結果を実験例14及び15の測定結果を実験例4及び1の測定結果とともに表4に、それぞれまとめて示した。
12 :ラミネート外装体
14 :巻回電極体
16 :正極集電タブ
18 :負極集電タブ
22 :凹部
24 :端部
26 :樹脂部材
Claims (3)
- リチウムイオンを吸蔵・放出する正極活物質と、導電剤と、結着剤とを含む正極合剤層が形成された正極極板と、
リチウムイオンを吸蔵・放出する負極活物質を含む負極合剤層が形成された負極極板と、
非水電解液と、
セパレータと、
を備え、
前記正極合剤層は分散剤を含有しており、
前記正極合剤層中の前記正極活物質量の含有量は97質量%以上であり、
前記正極合剤層中の前記導電剤と前記結着剤との含有比率は1.00~1.67であり、
前記結着剤はカルボキシル基ないしカルボキシル基誘導体を末端官能基に有するポリフッ化ビニリデンである、
非水電解質二次電池。 - 前記分散剤は、メチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシプロピルメチルセルロース及びポリビニルプロパノールから選択された少なくとも1種である、請求項1に記載の非水電解質二次電池。
- 前記正極極板の表面抵抗は900Ω以下である、請求項1又は2に記載の非水電解質二次電池。
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US14/434,317 US9640798B2 (en) | 2012-10-30 | 2013-10-25 | Nonaqueous electrolyte secondary battery |
JP2014544272A JP6282595B2 (ja) | 2012-10-30 | 2013-10-25 | 非水電解質二次電池 |
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JP2017188203A (ja) * | 2016-04-01 | 2017-10-12 | 住友金属鉱山株式会社 | リチウムイオン二次電池用正極材スラリーの安定性評価方法 |
JP2018174107A (ja) * | 2017-03-31 | 2018-11-08 | Tdk株式会社 | 正極、及びリチウムイオン二次電池 |
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JP2002134113A (ja) * | 2000-10-30 | 2002-05-10 | Matsushita Electric Ind Co Ltd | 非水系二次電池 |
JP2010033957A (ja) * | 2008-07-30 | 2010-02-12 | Toyo Ink Mfg Co Ltd | リチウム二次電池用正極合剤ペースト |
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JP2018174107A (ja) * | 2017-03-31 | 2018-11-08 | Tdk株式会社 | 正極、及びリチウムイオン二次電池 |
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US9640798B2 (en) | 2017-05-02 |
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