JP2010501995A - リチウム挿入が可能な高可逆性電極活物質及びその製造方法、これを備えた電極並びに二次電池 - Google Patents
リチウム挿入が可能な高可逆性電極活物質及びその製造方法、これを備えた電極並びに二次電池 Download PDFInfo
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- 239000007772 electrode material Substances 0.000 title claims abstract description 41
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 28
- 230000002441 reversible effect Effects 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000013078 crystal Substances 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 29
- 238000003780 insertion Methods 0.000 claims abstract description 23
- 230000037431 insertion Effects 0.000 claims abstract description 23
- ZMBHCYHQLYEYDV-UHFFFAOYSA-N trioctylphosphine oxide Chemical compound CCCCCCCCP(=O)(CCCCCCCC)CCCCCCCC ZMBHCYHQLYEYDV-UHFFFAOYSA-N 0.000 claims abstract description 19
- RMZAYIKUYWXQPB-UHFFFAOYSA-N trioctylphosphane Chemical compound CCCCCCCCP(CCCCCCCC)CCCCCCCC RMZAYIKUYWXQPB-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002243 precursor Substances 0.000 claims abstract description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 16
- 229920000642 polymer Polymers 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 8
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 5
- 125000004437 phosphorous atom Chemical group 0.000 claims description 5
- 239000011149 active material Substances 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 25
- 239000006182 cathode active material Substances 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007599 discharging Methods 0.000 abstract description 8
- 230000002427 irreversible effect Effects 0.000 abstract description 7
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052718 tin Inorganic materials 0.000 description 18
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 13
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- -1 CoP 3 Chemical class 0.000 description 6
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- 229910020929 Sn-Sn Inorganic materials 0.000 description 5
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- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 4
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 229910006710 Li—P Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910009044 Sn—P—P—Sn Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
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- 238000003487 electrochemical reaction 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
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 150000003839 salts Chemical group 0.000 description 2
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- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
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- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000003795 desorption Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 239000001177 diphosphate Substances 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 1
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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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5805—Phosphides
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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
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- C01B25/00—Phosphorus; Compounds thereof
- C01B25/08—Other phosphides
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Abstract
本発明は、涙滴状の単結晶SnP0.94の粒子をリチウム二次電池の陰極活物質として適用することによって、炭素陰極の2倍程度の可逆容量を有し、不可逆容量が非常に少なく、充放電によるリチウムイオンの挿入/脱離に対しても構造的に非常に安定しているため、体積変化がほとんど起こらず、優れたサイクル特性を有する陰極を提供することができる。
Description
(1)リチウム挿入(Li−intercalation)
MPn ⇔ LixMPn
(2)メタライゼーション又は金属との合金化 (metallization or metal alloying)
MPn ⇔ M(LixM)+LixP
a)Snの前駆体、トリオクチル(TOP)及びトリオクチルホスフィンオキシド(TOPO)を混合した溶液を製造するステップ、及び
b)前記溶液を加熱するステップ、
を含む方法で製造することができる。
本明細書に記載のSnP0.94粉末を電極活物質として含む電極は、当業界で公知の方法で製造することができる。例えば、前記電極は、本発明によって上記の物質を活物質として使用し、これに加えて、電気伝導性を付与するための導電剤、材料とコレクターとの間で接着を可能にするための結合剤をさらに使用することができる。
SnP0.94の合成は、トリオクチルホスフィン(TOP、[CH3(CH2)7]3P)とトリオクチルホスフィンオキシド(TOPO、[CH3(CH2)7]3PO)からなる高温溶液内で、スズアセテート(Sn(C2H3O2)2)を反応させる方法で行った。TOPO溶液にTOP−Sn錯体を注入する代わりに、0.36gのスズアセテート、10mlのTOP及び5gのTOPOを同時に混合して390℃で1時間加熱した。加熱中、煙が発生し、溶液が黒色に変色した。
図1の(a)及び(b)に、実施例1によってTOPとTOPOとの混合溶液内で熱分解方法で製造したリン化スズのTEMイメージを示した。
SnP0.94の合成において、TOPOを使用せず、0.36gのスズアセテートと10mlのTOPとを混合した以外は、実施例1と同様にして粉末の製造及び分析を行った。
Sn金属とPとを4:3モル比でボールミル粉砕を行い(24時間、1000rpm)、Sn4P3を合成した。初期充電容量は、900mAh/g程度の値を示したが(0V−1.2V)、30回目の後は、初期容量に対して5%の容量保持率を示した。
Claims (17)
- SnPx(0.9≦x≦0.98)の組成を有する、電極活物質。
- xが、0.94であり、
前記電極活物質の粒子が、単結晶であることを特徴とする、請求項1に記載の電極活物質。 - 六方晶系結晶格子のc軸方向に沿って選択的に異方性成長することを特徴とする、請求項1に記載の電極活物質。
- 前記活物質の粒子が、涙滴状であり、100nm〜1μm範囲の長さ、1.0〜10.0範囲のアスペクト比(長軸の長さ/短軸の長さ)の粒子サイズを有することを特徴とする、請求項1に記載の電極活物質。
- 涙滴状のテール部とヘッド部とを結ぶ長軸が、六方晶系結晶格子のc軸方向であることを特徴とする、請求項4に記載の電極活物質。
- 前記電極活物質が、六方晶系層状結晶構造を有し、スズ原子が単位格子内で六方充填されており、2種類のリン原子対が密接に連結され、前記層状のスラブが、−[Sn−P−P−Sn]− ジグザグ結合のポリマーネットワークをなすことを特徴とする、請求項1に記載の電極活物質。
- 充放電の際にリチウムが可逆的に挿入、脱離することを特徴とする、請求項1に記載の電極活物質。
- リチウムの挿入/脱離によっても結晶構造が変化しないことを特徴とする、請求項1に記載の電極活物質。
- リチウムの可逆的挿入/離脱によってもSnの酸化状態に変化がなく、Snイオン周辺の局部的な構造変異によって電荷補償が行われることを特徴とする、請求項1に記載の電極活物質。
- 充電の際に、リチウムが結晶格子の層間インタースティシャル位置に挿入されることを特徴とする、請求項1に記載の電極活物質。
- 0〜1.2Vにおいて、600〜900mAh/gの容量を有することを特徴とする、請求項1に記載の電極活物質。
- 40回目サイクルを行った後の容量保持率が90%以上であることを特徴とする、請求項1に記載の電極活物質。
- 最初充放電の際に、可逆効率が80%以上であることを特徴とする、請求項1に記載の電極活物質。
- Snの前駆体、トリオクチルホスフィン(TOP)及びトリオクチルホスフィンオキシド(TOPO)を混合した溶液を製造するステップ、及び
前記溶液を加熱するステップを含んでなり、
SnPx(0.9≦x≦0.98)の組成を有する電極活物質を製造する方法。 - Snの前駆体が、Snアセテートであることを特徴とする、請求項14に記載の製造方法。
- 請求項1〜13の何れか一項に記載の電極活物質を含んでなる、電極。
- 請求項16に記載の電極を備えてなる、リチウム二次電池。
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