JP2005149881A - 非水電解液二次電池 - Google Patents
非水電解液二次電池 Download PDFInfo
- Publication number
- JP2005149881A JP2005149881A JP2003384965A JP2003384965A JP2005149881A JP 2005149881 A JP2005149881 A JP 2005149881A JP 2003384965 A JP2003384965 A JP 2003384965A JP 2003384965 A JP2003384965 A JP 2003384965A JP 2005149881 A JP2005149881 A JP 2005149881A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- electrolyte secondary
- group
- nonaqueous electrolyte
- positive electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 65
- -1 sodium carbonate anhydride Chemical class 0.000 claims abstract description 62
- 229920001577 copolymer Polymers 0.000 claims abstract description 28
- 125000005936 piperidyl group Chemical group 0.000 claims abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 7
- 150000005678 chain carbonates Chemical class 0.000 claims description 6
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 6
- 150000002170 ethers Chemical class 0.000 claims description 5
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 4
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003125 aqueous solvent Substances 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 150000004862 dioxolanes Chemical class 0.000 claims description 2
- 150000002596 lactones Chemical class 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 2
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- 239000011149 active material Substances 0.000 claims 1
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- 229920000089 Cyclic olefin copolymer Polymers 0.000 abstract description 5
- 230000020169 heat generation Effects 0.000 abstract description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 4
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 3
- 150000001408 amides Chemical class 0.000 abstract description 3
- 159000000000 sodium salts Chemical class 0.000 abstract description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 2
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- 125000001931 aliphatic group Chemical group 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
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- 125000002723 alicyclic group Chemical group 0.000 description 6
- 125000003118 aryl group Chemical group 0.000 description 6
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical class C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
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- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 5
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- 239000000047 product Substances 0.000 description 5
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- 125000000217 alkyl group Chemical group 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 150000001412 amines Chemical group 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
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- 238000005259 measurement Methods 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- 238000009783 overcharge test Methods 0.000 description 4
- 125000003386 piperidinyl group Chemical group 0.000 description 4
- 150000005846 sugar alcohols Polymers 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
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- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 3
- 239000006230 acetylene black Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 125000002947 alkylene group Chemical group 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
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- 239000003431 cross linking reagent Substances 0.000 description 3
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 3
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- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
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- 239000003381 stabilizer Substances 0.000 description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
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- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical group [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 1
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- 239000003549 soybean oil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- WUPCFMITFBVJMS-UHFFFAOYSA-N tetrakis(1,2,2,6,6-pentamethylpiperidin-4-yl) butane-1,2,3,4-tetracarboxylate Chemical compound C1C(C)(C)N(C)C(C)(C)CC1OC(=O)CC(C(=O)OC1CC(C)(C)N(C)C(C)(C)C1)C(C(=O)OC1CC(C)(C)N(C)C(C)(C)C1)CC(=O)OC1CC(C)(C)N(C)C(C)(C)C1 WUPCFMITFBVJMS-UHFFFAOYSA-N 0.000 description 1
- NZNAAUDJKMURFU-UHFFFAOYSA-N tetrakis(2,2,6,6-tetramethylpiperidin-4-yl) butane-1,2,3,4-tetracarboxylate Chemical compound C1C(C)(C)NC(C)(C)CC1OC(=O)CC(C(=O)OC1CC(C)(C)NC(C)(C)C1)C(C(=O)OC1CC(C)(C)NC(C)(C)C1)CC(=O)OC1CC(C)(C)NC(C)(C)C1 NZNAAUDJKMURFU-UHFFFAOYSA-N 0.000 description 1
- YODZTKMDCQEPHD-UHFFFAOYSA-N thiodiglycol Chemical compound OCCSCCO YODZTKMDCQEPHD-UHFFFAOYSA-N 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
【解決手段】正極、負極、セパレータ及び非水電解液を用いた二次電池において、上記正極、負極又は上記セパレータに、(1)無水マレイン酸−α−オレフィン共重合体にイミド化を行い、2,2,6,6−テトラメチル−4−アミノピペリジンを反応させて得られる特定の構成単位及び(2)上記無水マレイン酸−α−オレフィン共重合体に無水炭酸ナトリウム等を反応させてナトリウム塩としたり、上記無水マレイン酸−α−オレフィン共重合体に2,2,6,6−テトラメチル−4−アミノピペリジンを反応させてアミド化した後、一部をアルカリ金属塩にしてアニオン化することにより得られる特定の構成単位からなる群から選択される1種以上より構成され平均分子量が1000〜500000であるピペリジル基含有共重合体を添加してなる非水電解液二次電池。
【選択図】なし
Description
また、上記一般式(2)に示される構成単位は、上記無水マレイン酸−α−オレフィン共重合体に無水炭酸ナトリウム等を反応させてナトリウム塩としたり、あるいは、上記無水マレイン酸−α−オレフィン共重合体に2,2,6,6−テトラメチル−4−アミノピペリジンを反応させてアミド化した後、一部をアルカリ金属塩にしてアニオン化することにより得ることができる。
また、これらの方法で得られる構成単位から構成されるピペリジル基含有共重合体中のピペリジル基を、過酸化水素等で酸化させてN−オキシルとすることも出来る。また、必要に応じて、ピペリジル基のN−OHとイソシアネート化合物とを反応させて末端をN置換カルバモイルオキシ基にすることも出来る。
上記芳香族エポキシ化合物としては、例えば、ハイドロキノン、レゾルシノール、ビスフェノールA、ビスフェノールF、4,4’−ジヒドロキシビフェニル、ノボラック、テトラブロモビスフェノールA、2,2−ビス(4−ヒドロキシフェニル)−1,1,1,3,3,3−ヘキサフルオロプロパン等の多価フェノールのグリシジルエーテル化合物が挙げられる。上記脂環族エポキシ化合物としては、少なくとも1個以上の脂環族環を有する多価アルコールのポリグリシジルエーテル又はシクロヘキセンやシクロペンテン環含有化合物を酸化剤でエポキシ化することによって得られるシクロヘキセンオキサイドやシクロペンテンオキサイド含有化合物が挙げられる。その具体例としては、水素添加ビスフェノールAジグリシジルエーテル、2,2−ビス(3,4−エポキシシクロヘキシル)プロパン、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロヘキシルカルボキシレート、3,4−エポキシ−1−メチルシクロヘキシル−3,4−エポキシ−1−メチルヘキサンカルボキシレート、6−メチル−3,4−エポキシシクロヘキシメチル−6−メチル−3,4−エポキシシクロヘキサンカルボキシレート、3,4−エポキシ−3−メチルシクロヘキシルメチル−3,4−エポキシ−3−メチルシクロヘキサンカルボキシレート、3,4−エポキシ−5−メチルシクロヘキシルメチル−3,4−エポキシ−5−メチルシクロヘキサンカルボキシレート、ビス(3,4−エポキシシクロヘキシルメチル)アジペート、メチレンビス(3,4−エポキシシクロヘキサン)、2,2−ビス(3,4−エポキシシクロヘキシル)プロパン、ジシクロペンタジエンジエポキサイド、エチレンビス(3,4−エポキシシクロヘキサンカルボキシレート)、エポキシヘキサヒドロフタル酸ジオクチル、エポキシヘキサヒドロフタル酸ジ−2−エチルへキシル等が挙げられる。上記脂肪族エポキシ化合物としては、脂肪族多価アルコール又はそのアルキレンオキサイド付加物のポリグリシジルエーテル、脂肪族長鎖多塩基酸のポリグリシジルエステル、グリシジルアクリレート又はグリシジルメタクリレートのビニル重合により合成したホモポリマー、グリシジルアクリレート又はグリシジルメタクリレートとその他のビニルモノマーとのビニル重合により合成したコポリマー等が挙げられる。代表的な化合物としては、1,4−ブタンジオールジグリシジルエーテル、1,6−ヘキサンジオールジグリシジルエーテル、グリセリンのトリグリシジルエーテル、トリメチロールプロパンのトリグリシジルエーテル、ソルビトールのテトラグリシジルエーテル、ジペンタエリスリトールのヘキサグリシジルエーテル、ポリエチレングリコールのジグリシジルエーテル、ポリプロピレングリコールのジグリシジルエーテル等の多価アルコールのグリシジルエーテル、またプロピレングリコール、トリメチロールプロパン、グリセリン等の脂肪族多価アルコールに1種又は2種以上のアルキレンオキサイドを付加することにより得られるポリエーテルポリオールのポリグリシジルエーテル、脂肪族長鎖二塩基酸のジグリシジルエステルが挙げられる。さらに、脂肪族高級アルコールのモノグリシジルエーテルや、フェノール、クレゾール、ブチルフェノール、また、これらにアルキレンオキサイドを付加することによって得られるポリエーテルアルコールのモノグリシジルエーテル、高級脂肪酸のグリシジルエステル、エポキシ化大豆油、エポキシステアリン酸オクチル、エポキシステアリン酸ブチル、エポキシ化ポリブタジエン等が挙げられる。
上記正極としては、正極活物質と結着剤と導電材とをスラリー化したものを集電体に塗布し、乾燥してシート状にしたものが使用される。該正極活物質としては、リチウムを含有する遷移金属化合物、特に複合酸化物が好ましく、具体的には、LiCoO2 、LiNiO2 、LiMn2 O4 、LiMnO2 、LiV2 O3 等が挙げられる。正極活物質の結着剤としては、例えば、ポリフッ化ビニリデン(PVDF)、EPDM、SBR、NBR、フッ素ゴム等が挙げられるが、これらに制限されるものではない。
攪拌装置、温度計、窒素導入管及びジムロート冷却管を付けた四つ口1000mlフラスコに、無水マレイン酸−イソブチレン共重合物((株)クラレ製;イソバン10;重量平均分子量165,000)462.5g(カルボン酸無水物として0.3モル)、及びN,N−ジメチルアセトアミドを433g仕込み攪拌、溶解した。次に、この溶液に110〜120℃で2,2,6,6−テトラメチル−4−ピペリジルアミン45.5g(0.29モル)をゆっくり滴下した。滴下終了後、徐々に温度を上げ150〜155℃にて11時間反応させ、イミド化を完了した。反応後、反応系をメタノール300mlで希釈し、アセトン4200mlへ滴下して再沈精製を行った。析出物を濾過、洗浄した後、減圧乾燥して薄黄色固体78.6g(収率91%、重量平均分子量310,000)を得た。得られた薄黄色固体は、IRによる分析により、目的とする中間体であるイミド体であることを確認した。IR分析結果を以下に示す。
<IR分析結果>
3442cm-1(N−H)、1698cm-1(イミド)、1778cm-1(酸無水物)
<IR分析結果>
1700cm-1(イミド)
合成例1と同様にして得た酸化反応終了後の反応液の濃縮物に、85%リン酸6.5gを水500mlに溶解した溶液を加えた後、テトラヒドロフラン50ml及び飽和食塩水50mlを順に加えて析出物を得た。得られた析出物を濾過、洗浄し減圧乾燥して橙色固体62.0g(収率75%、重量平均分子量325,000)を得た。得られた橙色固体は、IR分析により目的物(化合物No.2)であることを確認した。IR分析結果を以下に示す。また、ESR測定により、得られた化合物No.2の各単位構造に含まれるN−O・化率は61.8%と算出された。
<IR分析結果>
3448cm-1(O−H)、1700cm-1(イミド)
合成例2で得られた化合物No.2を25.0g、トリエチルアミンを0.17g、及びN,N−ジメチルアセトアミドを270g仕込み加熱攪拌した。ここへ、80℃でエポキシ樹脂(EHPE−3150:ダイセル化学工業(株)製) 2.2gとN,N−ジメチルアセトアミド2.2gとの混合液を仕込み、124〜127℃で50分間反応させた。反応物をメタノール1200g中に投入し、析出物を濾過、メタノール洗浄して固体を得た(20.2g、収率74%)。得られた固体は、IR分析により目的物(化合物No.3)であることを確認した。IR分析結果を以下に示す。また、ESR測定により、得られた化合物No.3の各単位構造に含まれるN−O・化率は54.3%と算出された。
<IR分析結果>
3448cm-1(O−H)、1698cm-1(イミド)
攪拌装置、温度計、窒素導入管及びジムロート冷却管を付けた四つ口500mlフラスコに、無水マレイン酸−イソブチレン共重合物((株)クラレ製;イソバン04;重量平均分子量60,000)を27.8g(カルボン酸無水物として0.18モル)、メタノール21.7g及び水162.3gを仕込み攪拌した後、室温で2,2,6,6−テトラメチル−4−ピペリジルアミン29.0g(0.18モル)を滴下した。滴下後80〜85℃まで加熱し2時間反応させた。40℃以下まで冷却した後、水酸化リチウム一水和物6.4gを仕込み1時間攪拌した。この溶液にケイタングステン酸0.14g及びデイクエスト2046(三菱モンサント化成(株)製)0.3gを加えた後、55℃に加熱した。そこに30%過酸化水素水51.0g(0.45モル)を55〜60℃の温度に保ちながら約1時間で滴下した後、1時間該温度で攪拌した。反応後、反応系を2800mlのアセトン溶媒中に滴下し、沈殿した結晶をろ別した後、アセトンで洗浄し乾燥して結晶を得た(収量50.6g、収率85%、重量平均分子量130,000)。得られた結晶は、IR分析により目的物(化合物No.4)であることを確認した。IR分析結果を以下に示す。
<IR分析結果>
3450cm-1(N−H)、1635cm-1、1560cm-1(アミド+カルボキシレート)
2,2,6,6−テトラメチル−4−ピペリジルアミンの使用量を23.9g(0.15モル)とし、水酸化リチウム一水和物の使用量を8.8gとした以外は、上記合成例4と同様の操作法により結晶を得た(収量45.7g、収率82%、重量平均分子量120,000)。得られた結晶は、IR分析により目的物(化合物No.5)であることを確認した。IR分析結果を以下に示す。
<IR分析結果>
3448cm-1(N−H)、1633cm-1、1560cm-1(アミド+カルボキシレート)
1.正極の作製
正極活物質としてLiNiO280質量部、導電剤としてアセチレンブラック10質量部、結着剤としてPVDF10質量部、及び試料化合物として合成例1〜4でそれぞれ得られた化合物No.1〜4(表1参照)5質量部の混合物に、N−メチルピロリドンを溶媒として加えてスラリーを調製した。該スラリーを15μm集電体のアルミニウム箔の両面に塗布し、乾燥プレス後、幅55mm、長さ800mmにスリットした後、120℃の真空乾燥を行ない、正極を作製した。
カーボン95質量部及び結着剤5質量部の混合物に、N−メチルピロピドンを溶媒として加えてスラリーを調製した。該スラリーを10μm集電体の銅箔に両面に塗布し、乾燥プレス後、幅60mm、長さ900mmにスリットした後、120℃の真空乾燥を行ない、負極を作製した。
エチレンカーボネートとジエチルカーボネートとの体積比1:1の混合溶媒に、LiPF6 を1モル/リットル溶かして非水電解液を調製した。
上記正極と上記負極との間に、微孔を有するポリエチレンフィルムからなるセパレータを介在させて、スパイラル状に巻回して極群を形成した。この極群をケースに収納した後、上記非水電解液を注入し、蓋をして密閉し、直径18mm、長さ650mmサイズの非水電解液二次電池を作製した。作製した非水電解液二次電池(円筒型のリチウム二次電池)の内部構造を示す斜視図を図1に、該リチウム二次電池の基本構成を図2に、それぞれ示す。
得られた非水電解液二次電池について、4.1Vまで定電流−定電圧充電を行ない満充電状態とした後、定電流で連続的に電流を流し続けて発煙に至らない場合の最大電流値(許容過充電電流値)を測定した。結果を表1に示す。
上記の方法にて作製した正極及び負極を円形に打ち抜き、これらに、微孔を有するポリエチレンフィルムからなるセパレータを介在させ挟み込むことにより、簡易的なセルを作製した。このセルを4.5Vまで定電流−定電圧充電を行ない満充電状態とした後、集電箔から正極及び負極を剥がし取り、これに一定量のセパレータと電解液を加え、室温〜300℃での発熱量を測定した。結果を表1に示す。尚、表1に示す結果は、下記比較例1における測定値を100とした相対値である。
正極に試料化合物を添加せず、負極に試料化合物(表1参照)を添加した以外は、実施例1と同様に、非水電解液二次電池を作製し、過充電試験及び過充電による発熱量の測定を行なった。結果を表1に示す。
正極に試料化合物を添加せず、試料化合物(表1参照)を添加したポリエチレンフィルムをセパレータとして用いた以外は、実施例1と同様に、非水電解液二次電池を作製し、過充電試験及び過充電による発熱量の測定を行なった。結果を表1に示す。
正極に試料化合物を添加しなかった以外は、実施例1と同様に、非水電解液二次電池を作製し、過充電試験及び過充電による発熱量の測定を行なった。結果を表1に示す。
正極に試料化合物として比較化合物1を添加した以外は、実施例1と同様に、非水電解液二次電池を作製し、過充電試験及び過充電による発熱量の測定を行なった。結果を表1に示す。
正極に試料化合物として比較化合物2を添加した以外は、実施例1と同様に、非水電解液二次電池を作製し、過充電試験及び過充電による発熱量の測定を行なった。結果を表1に示す。
表2記載の試料化合物を用いて、実施例1と同様の方法で正極を作製した。得られた正極を、実施例1と同様にして調製した非水電解液に室温で48時間浸漬した後、アルミニウム箔からの正極の剥がれの有無を目視観察し、以下の評価基準により、正極と非水電解液との親和性を評価した。結果を表2に示す。
(評価基準)
○:平滑な表面を維持して剥がれが認められない。
△:電極表面が若干凸凹して剥がれが発生した。
×:剥がれが著しく表面全体が凸凹になった。
1’ 負極板
1” 負極リード
2 負極集電体
3 正極
3’ 正極板
3” 正極リード
4 正極集電体
5 電解液
6 セパレータ
7 正極端子
8 負極端子
10 非水電解液二次電池
11 ケース
12 絶縁板
13 ガスケット
14 安全弁
15 PTC素子
Claims (9)
- 上記正極に、上記ピペリジル基含有共重合体を添加してなる請求項1記載の非水電解液二次電池。
- 上記正極が、リチウムを含有する遷移金属化合物を活物質とするものである請求項1又は2記載の非水電解液二次電池。
- 上記ピペリジル基含有共重合体が、上記一般式(2)に示される構成単位からなる群から選択される1種以上より構成され平均分子量が1000〜500000である請求項1〜3のいずれかに記載の非水電解液二次電池。
- 上記一般式(2)において、R4及びR6の一方が上記一般式(3)で表される基であり、上記一般式(3)におけるR0が酸素遊離基であり、R4及びR6の他方がリチウムである請求項4記載の非水電解液二次電池。
- 上記非水電解液において使用される有機溶媒が、カーボネート類、ラクトン類、エーテル類、スルホラン類及びジオキソラン類からなる非水溶媒の群から選択される1種以上を含有する請求項1〜5のいずれかに記載の非水電解液二次電池。
- 上記有機溶媒が、環状カーボネートの少なくとも1種及び鎖状カーボネートの少なくとも1種を含有する請求項6記載の非水電解液二次電池。
- 上記環状カーボネートが、エチレンカーボネート及び1,2−ブチレンカーボネートからなる群から選択される1種以上であり、かつ、上記鎖状カーボネートが、ジメチルカーボネート、エチルメチルカーボネート及びジエチルカーボネートからなる群から選択される1種以上である請求項7記載の非水電解液二次電池。
- 上記ピペリジル基含有共重合体が、架橋構造を有する請求項1〜8のいずれかに記載の非水電解液二次電池。
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