JP6870676B2 - 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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- JP6870676B2 JP6870676B2 JP2018501598A JP2018501598A JP6870676B2 JP 6870676 B2 JP6870676 B2 JP 6870676B2 JP 2018501598 A JP2018501598 A JP 2018501598A JP 2018501598 A JP2018501598 A JP 2018501598A JP 6870676 B2 JP6870676 B2 JP 6870676B2
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- positive electrode
- aqueous electrolyte
- electrode plate
- active material
- mass
- Prior art date
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims description 52
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 32
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 31
- 239000007774 positive electrode material Substances 0.000 claims description 25
- 239000002131 composite material Substances 0.000 claims description 21
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical group [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 150000001555 benzenes Chemical class 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- YTZKOQUCBOVLHL-UHFFFAOYSA-N tert-butylbenzene Chemical compound CC(C)(C)C1=CC=CC=C1 YTZKOQUCBOVLHL-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000007773 negative electrode material Substances 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- HHNHBFLGXIUXCM-GFCCVEGCSA-N cyclohexylbenzene Chemical group [CH]1CCCC[C@@H]1C1=CC=CC=C1 HHNHBFLGXIUXCM-GFCCVEGCSA-N 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 4
- ZQBFAOFFOQMSGJ-UHFFFAOYSA-N hexafluorobenzene Chemical compound FC1=C(F)C(F)=C(F)C(F)=C1F ZQBFAOFFOQMSGJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004305 biphenyl Substances 0.000 claims description 3
- 235000010290 biphenyl Nutrition 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- AJKNNUJQFALRIK-UHFFFAOYSA-N 1,2,3-trifluorobenzene Chemical compound FC1=CC=CC(F)=C1F AJKNNUJQFALRIK-UHFFFAOYSA-N 0.000 claims description 2
- QHTJSSMHBLGUHV-UHFFFAOYSA-N 2-methylbutan-2-ylbenzene Chemical compound CCC(C)(C)C1=CC=CC=C1 QHTJSSMHBLGUHV-UHFFFAOYSA-N 0.000 claims description 2
- XTBFPVLHGVYOQH-UHFFFAOYSA-N methyl phenyl carbonate Chemical compound COC(=O)OC1=CC=CC=C1 XTBFPVLHGVYOQH-UHFFFAOYSA-N 0.000 claims description 2
- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 claims description 2
- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 18
- -1 polyethylene Polymers 0.000 description 13
- 239000010410 layer Substances 0.000 description 11
- 239000002002 slurry Substances 0.000 description 10
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000003125 aqueous solvent Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
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- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 4
- 229910013870 LiPF 6 Inorganic materials 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000002612 dispersion medium Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910003002 lithium salt Inorganic materials 0.000 description 3
- 159000000002 lithium salts Chemical class 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 2
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- 229910013063 LiBF 4 Inorganic materials 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000001733 carboxylic acid esters Chemical class 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BHIWKHZACMWKOJ-UHFFFAOYSA-N methyl isobutyrate Chemical compound COC(=O)C(C)C BHIWKHZACMWKOJ-UHFFFAOYSA-N 0.000 description 2
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 2
- 239000012982 microporous membrane Substances 0.000 description 2
- 238000009783 overcharge test Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- VUAXHMVRKOTJKP-UHFFFAOYSA-M 2,2-dimethylbutanoate Chemical compound CCC(C)(C)C([O-])=O VUAXHMVRKOTJKP-UHFFFAOYSA-M 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910015608 LiNi0.82Co0.15Al0.03O2 Inorganic materials 0.000 description 1
- 229910015720 LiNi0.85Co0.12Al0.03O2 Inorganic materials 0.000 description 1
- 229910015746 LiNi0.88Co0.09Al0.03O2 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 125000006267 biphenyl group Chemical group 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000004651 carbonic acid esters Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- OZJPLYNZGCXSJM-UHFFFAOYSA-N delta-Valerolactone Natural products O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- HHEIMYAXCOIQCJ-UHFFFAOYSA-N ethyl 2,2-dimethylpropanoate Chemical compound CCOC(=O)C(C)(C)C HHEIMYAXCOIQCJ-UHFFFAOYSA-N 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- WDAXFOBOLVPGLV-UHFFFAOYSA-N isobutyric acid ethyl ester Natural products CCOC(=O)C(C)C WDAXFOBOLVPGLV-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Description
正極活物質は一般式LixNiyM(1-y)O2(0<x≦1.2、0.85≦y≦0.99、MはAl、Co、Fe、Cu、Mg、Ti、Zr、Ce、及びWから選ばれる少なくとも1種の元素)で表されるリチウムニッケル複合酸化物であり、正極活物質の質量に対して0.01質量%以上0.2質量%以下の炭酸リチウムが正極板に添加されていることを特徴としている。
正極活物質は一般式LixNiyM(1-y)O2(0<x≦1.2、0.88≦y≦0.99、MはAl、Co、Fe、Cu、Mg、Ti、Zr、Ce、及びWから選ばれる少なくとも1種の元素)で表されるリチウムニッケル複合酸化物であり、正極活物質の質量に対して0.01質量%以上0.2質量%以下の炭酸リチウムが正極板に添加されていることを特徴としている。
(正極板の作製)
複合酸化物中の金属元素の総モル数に対する水酸化リチウムのモル数の比が1.025となるように、水酸化リチウムとNi0.85Co0.12Al0.03O2で表される複合酸化物を混合した。その混合物を750℃の酸素雰囲気下で18時間焼成することにより、LiNi0.85Co0.12Al0.03O2で表されるリチウムニッケル複合酸化物を作製した。
負極活物質としての黒鉛が97質量部、結着剤としてのスチレンブタジエンゴムが1.5質量部、増粘剤としてのカルボキシメチルセルロースが1.5質量部となるように混合した。その混合物を分散媒としての水へ投入し、混練して負極合剤スラリーを作製した。その負極合剤スラリーを銅箔からなる負極集電体の両面に塗布し、乾燥して負極合剤層を形成した。その負極合剤層を所定厚みになるように圧縮し、圧縮後の極板を所定寸法に切断した。最後に、負極合剤層が形成されていない負極集電体の露出部に負極タブ14を接合して負極板13を作製した。
正極板11と負極板13をポリエチレン製微多孔膜からなるセパレータ15を介して巻回することにより、電極体16を作製した。電極体16の巻き終り部のセパレータの端部は粘着テープで固定した。
エチレンカーボネート(EC)とジメチルカーボネート(DMC)を3:7の体積比(1気圧、25℃)で混合して非水溶媒を調製した。その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1.0mol/Lの濃度で溶解して非水電解質を調製した。
端子キャップ22、弁体23、環状の絶縁板24、及び端子板25を積層して封口体21を作製した。弁体23及び端子板25はアルミニウム板からなり、弁体23は電池内圧の増加に伴って変形することができる。弁体23が電池内圧を受けるように端子板25には複数の通気孔を設けた。電池内圧が所定値に達すると、弁体23と端子板25の接合部が破断して封口体内部の電流経路が遮断される。このように本実験例では、弁体23、絶縁板24、及び端子板25から電流遮断機構を構成した。
電極体16の上部及び下部にそれぞれ上部絶縁板17及び下部絶縁板18を配置し、電極体16を外装缶20へ挿入した。負極タブ14を外装缶20の底部に接続し、正極タブ12を封口体21に接続した。非水電解質を外装缶20の内部へ注入した後、封口体21を外装缶20の開口部にガスケット19を介してかしめ固定して実験例1に係る非水電解質二次電池10を作製した。
炭酸リチウムの添加量を表1に記載された値としたこと以外は実験例1と同様にして実験例2〜5に係る非水電解質二次電池10を作製した。なお、表1に記載された炭酸リチウムの添加量は正極活物質の質量に対する百分率で表している。
非水電解質がシクロヘキシルベンゼンを含むこと以外は実験例1と同様にして実験例6に係る非水電解質二次電池10を作製した。シクロヘキシルベンゼンの含有量は非水溶媒の質量に対して1質量%とした。
非水電解質がtert−ブチルベンゼンを含むこと以外は実験例1と同様にして実験例7に係る非水電解質二次電池10を作製した。tert−ブチルベンゼンの含有量は非水溶媒の質量に対して1質量%とした。
正極活物質としてLiNi0.88Co0.09Al0.03O2で表されるリチウムニッケル複合酸化物を用い、炭酸リチウムの添加量を表1に記載された値としたこと以外は実験例1と同様にして実験例8〜12に係る非水電解質二次電池10を作製した。
正極活物質としてLiNi0.91Co0.06Al0.03O2で表されるリチウムニッケル複合酸化物を用い、炭酸リチウムの添加量を表1に記載された値としたこと以外は実験例1と同様にして実験例13〜17に係る非水電解質二次電池10を作製した。
正極活物質としてLiNi0.82Co0.15Al0.03O2で表されるリチウムニッケル複合酸化物を用い、炭酸リチウムの添加量を表1に記載された値としたこと以外は実験例1と同様にして実験例18〜22に係る非水電解質二次電池10を作製した。
炭酸リチウムの添加量を正極活物質の質量に対して0.3質量%としたこと以外は実験例8〜12と同様にして実験例23に係る非水電解質二次電池10を作製した。
実験例1〜22の各電池を0.3Itの定電流で充電し、電流遮断機構が作動したときの充電深度(SOC)と最高到達温度を測定した。表1に測定結果を示す。
実験例8〜12及び23の各電池を0.3Itの定電流で電池電圧が4.2Vになるまで充電し、次いで4.2Vの低電圧で電流が0.02Itになるまで充電した。その後、各電池を0.5Itの定電流で電池電圧が2.5Vになるまで放電した。この充放電サイクルを45℃の環境下で1000サイクル繰り返した。1サイクル目の放電容量に対する1000サイクル目の放電容量の百分率を容量維持率として算出した。その結果を表2に示す。
11 正極板
13 負極板
15 セパレータ
20 外装缶
21 封口体
Claims (3)
- 正極活物質を含む正極板と、負極活物質を含む負極板と、前記正極板及び前記負極板の間に介在するセパレータと、非水電解質と、有底筒状の外装缶と、所定の電池内圧で作動する電流遮断機構を有する封口体と、を備え、
前記正極活物質は一般式LixNiyM(1-y)O2(0<x≦1.2、0.85≦y≦0.99、MはAl、Co、Fe、Cu、Mg、Ti、Zr、Ce、及びWから選ばれる少なくとも1種の元素)で表されるリチウムニッケル複合酸化物であり、
前記正極活物質の質量に対して0.01質量%以上0.2質量%以下の炭酸リチウムが前記正極板に添加されている、
非水電解質二次電池。 - 正極活物質を含む正極板と、負極活物質を含む負極板と、前記正極板及び前記負極板の間に介在するセパレータと、非水電解質と、有底筒状の外装缶と、所定の電池内圧で作動する電流遮断機構を有する封口体と、を備え、
前記正極活物質は一般式LixNiyM(1-y)O2(0<x≦1.2、0.88≦y≦0.99、MはAl、Co、Fe、Cu、Mg、Ti、Zr、Ce、及びWから選ばれる少なくとも1種の元素)で表されるリチウムニッケル複合酸化物であり、
前記正極活物質の質量に対して0.01質量%以上0.2質量%以下の炭酸リチウムが前記正極板に添加されている、
非水電解質二次電池。 - 前記非水電解質が、シクロヘキシルベンゼン、tert−ブチルベンゼン、tert−ペンチルベンゼン、ビフェニル、フルオロベンゼン、トリフルオロベンゼン、ベンゼン、ヘキサフルオロベンゼン、フェニルラクトン、ジフェニルエーテル、ジフェニルカーボネート、及び、メチルフェニルカーボネートから選ばれる少なくとも1種のベンゼン誘導体を含む請求項1又は2に記載の非水電解質二次電池。
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