JP2008091132A - Electrode active material - Google Patents

Electrode active material Download PDF

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JP2008091132A
JP2008091132A JP2006269041A JP2006269041A JP2008091132A JP 2008091132 A JP2008091132 A JP 2008091132A JP 2006269041 A JP2006269041 A JP 2006269041A JP 2006269041 A JP2006269041 A JP 2006269041A JP 2008091132 A JP2008091132 A JP 2008091132A
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active material
electrode active
niaben
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electrode
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JP5151108B2 (en
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Satoru Tsumeda
覚 爪田
Shunzo Suematsu
俊造 末松
Kenji Tamamitsu
賢次 玉光
Hidenori Uchi
秀則 内
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Nippon Chemi Con Corp
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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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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode active material decreasing voltage dependency of charge quantities facilitating the monitoring of power storage amounts. <P>SOLUTION: The electrode active material is a polymer transition metal complex compound having specific structure, and the transition metal complex compound is comprised of an N,N'-bisaminobenzal compound, for example, N,N'-bis(2-aminobenzal)ethylene diaminate nickel, connected with a divalent aliphatic group or a saturated or unsaturated aromatic group, and having Ni, Pb, Co, Cu, Fe as the transition metal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電荷量の電圧依存性の少ない電極活物質に関するものである。   The present invention relates to an electrode active material having less voltage dependency of charge amount.

近年、地球の環境問題などから、エンジン駆動であるガソリン車やディーゼル車に代わり、電気自動車やハイブリッド車への期待が高まっている。これらの電気自動車やハイブリッド車では、モーターを駆動させるための電源としては、高エネルギー密度かつ高出力密度特性を有する電気化学素子が用いられる。このような電気化学素子としては、二次電池、電気二重層キャパシタがある。   In recent years, due to environmental problems on the earth, there are increasing expectations for electric vehicles and hybrid vehicles in place of engine-driven gasoline vehicles and diesel vehicles. In these electric vehicles and hybrid vehicles, an electrochemical element having high energy density and high output density characteristics is used as a power source for driving the motor. Such electrochemical elements include secondary batteries and electric double layer capacitors.

しかしながら、二次電池では出力性能が不足しており、電気二重層キャパシタでは容量が不足しているという問題点がある。これを解決する電極材料として導電性高分子を用いた電極材料が提案されている。これは導電性高分子に対する電解質イオンのドープ反応及び脱ドープ反応を原理としている。このような導電性高分子としては、ポリアニリン、ポリチオフェン、ポリピリジン等が研究されている。   However, there is a problem that the output performance of the secondary battery is insufficient, and the capacity of the electric double layer capacitor is insufficient. As an electrode material for solving this problem, an electrode material using a conductive polymer has been proposed. This is based on the principle of doping and dedoping reactions of electrolyte ions on conductive polymers. As such a conductive polymer, polyaniline, polythiophene, polypyridine and the like have been studied.

これらのなかで、ポリ３−メチルチオフェンは、高い導電性を有し、且つ、熱安定性にも優れる有機機能性材料であり、その特性を利用してコンデンサや電池、電気化学キャパシタなど様々な用途への応用が検討されている（非特許文献１参照）。
Ｊｏｕｒｎａｌ ｏｆ Ｐｏｗｅｒ Ｓｏｕｒｃｅｓ １５８，７８９−７９４（２００６） Among these, poly-3-methylthiophene is an organic functional material having high conductivity and excellent thermal stability, and various properties such as capacitors, batteries, and electrochemical capacitors are utilized by utilizing the characteristics. Application to applications has been studied (see Non-Patent Document 1).
Journal of Power Sources 158, 789-794 (2006)

しかしながら、このポリ３−メチルチオフェンは、電圧によって電荷量が不規則に変化するため、蓄電量のモニタリングがやりにくいといった問題点があった。   However, this poly-3-methylthiophene has a problem in that it is difficult to monitor the amount of stored electricity because the amount of charge varies irregularly depending on the voltage.

本発明は、上述したような従来技術の問題点を解消するために提案されたものであり、その目的は、蓄電量のモニタリングが容易になる、電荷量の電圧依存性の少ない電極活物質を提供することにある。   The present invention has been proposed in order to solve the above-described problems of the prior art, and an object of the present invention is to provide an electrode active material that is easy to monitor the amount of charge and has little voltage dependency on the amount of charge. It is to provide.

本発明者は、上記課題を解決すべく、電荷量の電圧依存性の少ない電極活物質について鋭意検討を重ねた結果、本発明を完成させるに至ったものである。すなわち、下記の化学式（１）で示される構成単位、または、化学式（１）の誘導体からなる構成単位を有する高分子遷移金属錯体化合物からなる電極活物質は、電荷量の電圧依存性が低いことを見出した。
In order to solve the above-mentioned problems, the present inventor has intensively studied an electrode active material having a small amount of charge depending on voltage, and as a result, has completed the present invention. That is, an electrode active material composed of a polymer transition metal complex compound having a structural unit represented by the following chemical formula (1) or a structural unit composed of a derivative of the chemical formula (1) has a low voltage dependency of charge amount. I found.

本発明によれば、蓄電量のモニタリングが容易になる、電荷量の電圧依存性の少ない電極活物質を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the electrode active material with little voltage dependency of the electric charge amount which becomes easy to monitor the amount of electrical storage can be provided.

本発明に係る電極活物質は、以下のようにして得ることができる。
なお、以下の説明においては、上記化学式（１）の「Ｍｅ（Ｍｅｔａｌ）」としてニッケル（Ｎｉ）を用いたＮｉＡＢＥＮ（Ｎ，Ｎ’−Ｂｉｓ（２−ａｍｉｎｏｂｅｎｚａｌ）ｅｔｈｙｌｅｎｅｄｉａｍｉｎａｔｏｎｉｃｋｅｌ）を例に挙げて説明する。 The electrode active material according to the present invention can be obtained as follows.
In the following description, NiABEN (N, N′-Bis (2-aminobenzal) ethyladiaminekel) using nickel (Ni) as “Me (Metal)” in the chemical formula (1) will be described as an example. .

（電極活物質）
本発明に係る電極活物質は、例えば、下記の化学式（２）で示される構成単位、または、化学式（２）の誘導体からなる構成単位を有する高分子遷移金属錯体化合物（ＮｉＡＢＥＮ）を、支持電解質としてのイオン性物質を含む電解溶液中で電解酸化重合することにより得られる。
(Electrode active material)
The electrode active material according to the present invention includes, for example, a polymer electrolyte metal complex compound (NiABEN) having a structural unit represented by the following chemical formula (2) or a structural unit composed of a derivative of the chemical formula (2), as a supporting electrolyte. It can be obtained by electrolytic oxidation polymerization in an electrolytic solution containing an ionic substance.

（イオン性物質）
上記イオン性物質とは、電解酸化重合時に支持電解質としての機能を発揮すると共に、電解酸化重合により生成したポリマー（ポリＮｉＡＢＥＮ）に陰イオンをドーピングするための物質であり、例えば、過塩素酸イオンを生成する過塩素酸、過塩素酸ナトリウム、過塩素酸カリウムのような物質をいう。その他の陰イオンについても、同様に陰イオンの源となる物質を意味する。 (Ionic substances)
The ionic substance is a substance that exhibits a function as a supporting electrolyte at the time of electrolytic oxidation polymerization and is used to dope anions into a polymer (poly NiABEN) produced by electrolytic oxidation polymerization. A substance such as perchloric acid, sodium perchlorate, or potassium perchlorate that produces Other anions also mean substances that are sources of anions.

（支持電解質）
上記の電解酸化重合に際して用いる支持電解質としては、溶媒に可溶で、且つ、陰イオンを解離しやすい塩を使用する。より具体的には、過塩素酸テトラブチルアンモニウム、過塩素酸テトラエチルアンモニウム、過塩素酸リチウムなどの過塩素酸塩；テトラフルオロホウ酸ナトリウム、テトラフルオロホウ酸リチウム、テトラフルオロホウ酸テトラエチルアンモニウム、テトラフルオロホウ酸テトラブチルアンモニウムなどのテトラフルオロホウ酸塩；トルエンスルホン酸ナトリウム、トリフルオロメタンスルホン酸リチウムなどのスルホン酸；塩ヨウ化リチウムなどのヨウ素酸塩；臭化リチウムなどの臭化水素酸塩；塩化リチウムなどの塩酸塩などが挙げられる。 (Supporting electrolyte)
As the supporting electrolyte used in the electrolytic oxidation polymerization, a salt that is soluble in a solvent and easily dissociates anions is used. More specifically, perchlorate such as tetrabutylammonium perchlorate, tetraethylammonium perchlorate, lithium perchlorate; sodium tetrafluoroborate, lithium tetrafluoroborate, tetraethylammonium tetrafluoroborate, tetra Tetrafluoroborate such as tetrabutylammonium fluoroborate; sulfonic acid such as sodium toluenesulfonate, lithium trifluoromethanesulfonate; iodate such as lithium chloroiodide; hydrobromide such as lithium bromide; Examples thereof include hydrochlorides such as lithium chloride.

これらの中でも、過塩素酸テトラブチルアンモニウム、テトラフルオロホウ酸テトラエチルアンモニウム及びテトラフルオロホウ酸テトラブチルアンモニウムがより好ましい。   Among these, tetrabutylammonium perchlorate, tetraethylammonium tetrafluoroborate, and tetrabutylammonium tetrafluoroborate are more preferable.

（電解酸化重合に使用する溶媒）
この電解酸化重合に使用する溶媒は、支持電解質をよく溶解するものが好ましく、具体的には、非プロトン性有機溶媒、エチレンカーボネート、プロピレンカーボネート、ブチレンカーボネート、γ−ブチロラクトン、γ−バレロラクトン、アセトニトリル、グルタロニトリル、アジポニトリル、メトキシアセトニトリル、３−メトキシプロピオンニトリル、Ｎ，Ｎ−ジメチルホルムアミド、Ｎ，Ｎ−ジメチルアセトアミド、Ｎ−メチルピロリジノン、Ｎ−メチルオキサゾリジノン、Ｎ，Ｎ’−ジメチルイミダゾリジノン、ニトロメタン、ニトロエタン、スルホラン、ジメチルスルホキシスルホキシド、トリメチルホスフェイト、ジメチルカーボネート、エチルメチルカーボネート、ジエチルカーボネートなどが挙げられる。これらの溶媒の中では、アセトニトリル、プロピレンカーボネートがより好ましい。 (Solvent used for electrolytic oxidation polymerization)
The solvent used for this electrolytic oxidation polymerization is preferably one that dissolves the supporting electrolyte well. Specifically, an aprotic organic solvent, ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, γ-valerolactone, acetonitrile Glutaronitrile, adiponitrile, methoxyacetonitrile, 3-methoxypropiononitrile, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidinone, N-methyloxazolidinone, N, N′-dimethylimidazolidinone, Examples thereof include nitromethane, nitroethane, sulfolane, dimethylsulfoxy sulfoxide, trimethyl phosphate, dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate. Among these solvents, acetonitrile and propylene carbonate are more preferable.

なお、上記溶媒中のＮｉＡＢＥＮの濃度は、１〜２０ｍｍｏｌ／リットル程度が好ましく、５〜１０ｍｍｏｌ／リットル程度がより好ましい。また、上記溶媒中の支持電解質の濃度は、０．０１〜１モル／リットル程度が好ましく、０．５〜１モル／リットル程度がより好ましい。   The concentration of NiABEN in the solvent is preferably about 1 to 20 mmol / liter, more preferably about 5 to 10 mmol / liter. The concentration of the supporting electrolyte in the solvent is preferably about 0.01 to 1 mol / liter, and more preferably about 0.5 to 1 mol / liter.

（電解方法）
電解は、定電流法、定電位法、電位走査法等のいずれの方法により行なっても良く、また、２極法でも３極法でも行なうことができる。３極法で行なう場合に用いる参照電極としては、Ａｇ／Ａｇ+が好ましい。また、電極としては、導電性ガラス、Ｐｔ、カーボン電極などを用いることができる。例えば、定電位法の場合の電位は、通常０．２〜１．０Ｖｖｓ．Ａｇ／Ａｇ+の範囲であり、より好ましくは０．４〜０．６Ｖｖｓ．Ａｇ／Ａｇ+程度である。なお、アセトニトリル系の溶媒を用いた場合には、約０．４Ｖプラスした電位とすることが好ましい。 (Electrolysis method)
The electrolysis may be performed by any method such as a constant current method, a constant potential method, and a potential scanning method, and can be performed by a bipolar method or a tripolar method. As the reference electrode used in the case of the triode method, Ag / Ag + is preferable. Further, as the electrode, conductive glass, Pt, carbon electrode, or the like can be used. For example, the potential in the case of the constant potential method is usually 0.2 to 1.0 Vvs. It is the range of Ag / Ag + , More preferably, it is 0.4-0.6Vvs. It is about Ag / Ag + . In the case where an acetonitrile-based solvent is used, it is preferable that the potential is about 0.4 V plus.

上記のような条件下で電解重合を行なうことにより、導電性ガラス、Ｐｔ、カーボン電極等の陽極表面上に、定電流法、定電位法、電位走査法等により、フィルム状のポリＮｉＡＢＥＮが次第に形成される。   By performing electropolymerization under the above conditions, film-like poly-NiABEN is gradually formed on the surface of the anode of conductive glass, Pt, carbon electrode, etc. by the constant current method, constant potential method, potential scanning method, etc. It is formed.

（化学重合）
本発明に係るポリＮｉＡＢＥＮは、ＮｉＡＢＥＮを溶媒中で酸化剤の存在下で化学的に重合させることによっても得ることができる。この重合反応における溶媒としては、プロピレンカーボネート、アセトニトリル、クロロホルム等を用いることが好ましく、クロロホルムがより好ましい。また、化学的重合反応における溶媒中のＮｉＡＢＥＮの濃度は、１〜２０ｍｍｏｌ／リットル程度が好ましく、５〜１０ｍｍｏｌ／リットル程度がより好ましい。 (Chemical polymerization)
The poly-NiABEN according to the present invention can also be obtained by chemically polymerizing NiABEN in a solvent in the presence of an oxidizing agent. As a solvent in this polymerization reaction, it is preferable to use propylene carbonate, acetonitrile, chloroform or the like, and chloroform is more preferable. The concentration of NiABEN in the solvent in the chemical polymerization reaction is preferably about 1 to 20 mmol / liter, and more preferably about 5 to 10 mmol / liter.

また、酸化剤としては、一般的に用いられている酸化剤が広く使用でき、具体的にはＣｅ（IV）（ＮＨ4）2（ＮＯ3）4、ＫＭｎＯ4、Ｋ2Ｃｒ2Ｏ7、Ｋ3Ｆｅ（ＣＮ）6などが挙げられる。化学重合時に使用する酸化剤の中では、Ｃｅ（IV）（ＮＨ4）2（ＮＯ3）4がより好ましい。なお、この酸化剤は、反応溶液中１〜６０ｍｍｏｌ／リットル程度の濃度で使用される。また、化学的重合反応における反応温度は−２０〜８０℃程度であり、反応時間は１〜７２時間程度である。 Further, as the oxidizing agent, generally used oxidizing agents can be widely used. Specifically, Ce (IV) (NH 4 ) 2 (NO 3 ) 4 , KMnO 4 , K 2 Cr 2 O 7 , Examples thereof include K 3 Fe (CN) 6 . Of the oxidizing agents used during chemical polymerization, Ce (IV) (NH 4 ) 2 (NO 3 ) 4 is more preferred. This oxidizing agent is used in the reaction solution at a concentration of about 1 to 60 mmol / liter. The reaction temperature in the chemical polymerization reaction is about -20 to 80 ° C, and the reaction time is about 1 to 72 hours.

（本発明に係るポリＮｉＡＢＥＮを使用する電池）
本発明に係るポリＮｉＡＢＥＮを使用する電池としては、各種の二次電池などが挙げられる。この様な電池におけるその他の構成材料は、公知の電池における構成材料と同様で良い。 (Battery using poly NiABEN according to the present invention)
Examples of the battery using the poly NiABEN according to the present invention include various secondary batteries. Other constituent materials in such a battery may be the same as those in known batteries.

例えば、本発明に係るポリＮｉＡＢＥＮを正極活物質として使用し、リチウム金属を負極として使用するリチウム二次電池を製造する場合には、３．５Ｖ以上の開回路電圧を示す電池が得られる。この場合、電解液としては、リチウム塩を高濃度で溶解した有機溶媒を使用することが好ましく、有機溶媒としては、カーボネート類およびジメトキシエタンが好ましい。   For example, in the case of producing a lithium secondary battery using the poly-NiABEN according to the present invention as a positive electrode active material and using lithium metal as a negative electrode, a battery having an open circuit voltage of 3.5 V or more is obtained. In this case, as the electrolytic solution, it is preferable to use an organic solvent in which a lithium salt is dissolved at a high concentration. As the organic solvent, carbonates and dimethoxyethane are preferable.

本発明に係るポリＮｉＡＢＥＮは、電気化学的に活性であり、且つ、安定性が高いので、これを用いることにより高出力特性を示す電池を得ることができる。   Since the poly-NiABEN according to the present invention is electrochemically active and has high stability, a battery exhibiting high output characteristics can be obtained by using this.

上記化学式（２）で示されるＮｉＡＢＥＮを、１ＭＴＥＡＢＦ4／ＰＣ中に溶解させ、この溶液中にグラッシーカーボンを浸し、電位走査法によりグラッシーカーボン上にポリＮｉＡＢＥＮを形成させた。対極には活性炭シート電極、参照電極にはＡｇ／Ａｇ+を使用した。 NiABEN represented by the above chemical formula (2) was dissolved in 1MTEABF 4 / PC, glassy carbon was immersed in this solution, and poly-NiABEN was formed on the glassy carbon by the potential scanning method. An activated carbon sheet electrode was used for the counter electrode, and Ag / Ag + was used for the reference electrode.

ポリＮｉＡＢＥＮを形成させたグラッシーカーボンを１ＭＴＥＡＢＦ4／ＰＣ電解液に浸し、三極式でポリＮｉＡＢＥＮに電位を印加して電位負荷試験を行い、容量減少を測定した。比較例としては、ＮｉＳａｌｅｎ、Ｎｉ［（３−ＥｔＯ）Ｓａｌｅｎ］を用いた。なお、これらの比較例を用いた電極は、上記ＮｉＡＢＥＮを用いた電極と同じ方法により作製した。また、上記ＴＥＡＢＦ4は、テトラエチルアンモニウムテトラフルオロボレートであり、ＰＣはプロピレンカーボネートを意味する。 Glassy carbon on which poly-NiABEN was formed was immersed in 1MTEABF 4 / PC electrolyte, and a potential load test was conducted by applying a potential to poly-NiABEN in a tripolar manner, and the capacity reduction was measured. As comparative examples, NiSalen and Ni [(3-EtO) Salen] were used. In addition, the electrode using these comparative examples was produced by the same method as the electrode using the NiABEN. The TEABF 4 is tetraethylammonium tetrafluoroborate, and PC means propylene carbonate.

（ＣＶ曲線）
上記化学式（２）で示されるＮｉＡＢＥＮをグラッシーカーボン上に電解重合して得られた高分子遷移金属錯体化合物（ポリＮｉＡＢＥＮ）のＣＶ曲線（参照電極：Ａｇ／Ａｇ+）は、図１に示すようになった。 (CV curve)
The CV curve (reference electrode: Ag / Ag + ) of the polymer transition metal complex compound (polyNiABEN) obtained by electrolytic polymerization of NiABEN represented by the chemical formula (2) on glassy carbon is as shown in FIG. Became.

図から明らかなように、−１Ｖ〜１．５Ｖに酸化電流が見られ、正極として用いることができることが分かった。また、−２．２Ｖ〜−２．６Ｖに還元電流が見られ、負極として用いることができることが分かった。   As is apparent from the figure, an oxidation current was observed at -1 V to 1.5 V, and it was found that it can be used as a positive electrode. Moreover, the reduction current was seen in -2.2V--2.6V, and it turned out that it can be used as a negative electrode.

また、上記特許文献１に示されたポリ３−メチルチオフェンに比べて、−１〜１Ｖでの電圧依存性が小さいことが分かった。なお、ポリ３−メチルチオフェンの場合はリチウムを参照電極に用いているため、参照電極としてＡｇ／Ａｇ+を用いた本実施例と比較するに当たって、約３．８Ｖ差し引いた値で比較した。 Moreover, it turned out that the voltage dependence in -1 to 1V is small compared with the poly 3-methylthiophene shown by the said patent document 1. FIG. In the case of poly-3-methylthiophene, since lithium is used for the reference electrode, comparison was made with a value obtained by subtracting about 3.8 V in comparison with this example using Ag / Ag + as the reference electrode.

すなわち、上記特許文献１に示されたポリ３−メチルチオフェンの場合には、３〜４Ｖ（本実施例の−０．８〜０．２Ｖに相当）の狭い電位範囲でのみ酸化還元電流が流れているため電圧依存性が高いと言えるが、本実施例では、−１．５〜１Ｖの広い電位範囲にわたって酸化還元電流が流れていることから、電圧依存性が小さいと言える。   That is, in the case of poly-3-methylthiophene disclosed in Patent Document 1, a redox current flows only in a narrow potential range of 3 to 4 V (corresponding to -0.8 to 0.2 V in this embodiment). Therefore, it can be said that the voltage dependency is high, but in this example, since the oxidation-reduction current flows over a wide potential range of −1.5 to 1 V, it can be said that the voltage dependency is small.

（ＤＣ負荷試験）
次に、本発明に係るポリＮｉＡＢＥＮを用いて作製した電極と、ポリＮｉＡＢＥＮに類似する高分子化合物（ポリＮｉＳａｌｅｎ、ポリＮｉ［（３−ＥｔＯ）Ｓａｌｅｎ］）を用いて作製した電極のそれぞれについて定電位負荷特性を調べたところ、図２に示すような結果が得られた。図から明らかなように、本発明に係るポリＮｉＡＢＥＮを用いて作製した電極の定電位負荷特性は、他の２つの高分子化合物を用いて作製した電極に比べて良好であることが分かった。 (DC load test)
Next, an electrode prepared using the poly-NiABEN according to the present invention and an electrode prepared using a polymer compound similar to poly-NiABEN (poly-NiSalen, poly-Ni [(3-EtO) Salen]) were determined. When the potential load characteristics were examined, results as shown in FIG. 2 were obtained. As is apparent from the figure, it was found that the constant potential load characteristic of the electrode produced using the poly-NiABEN according to the present invention was better than that of the electrode produced using the other two polymer compounds.

本発明に係る高分子遷移金属錯体化合物（ポリＮｉＡＢＥＮ）のＣＶ曲線。The CV curve of the polymer transition metal complex compound (poly NiABEN) based on this invention. 本発明に係る高分子遷移金属錯体化合物（ポリＮｉＡＢＥＮ）を用いて作製した電極の定電位負荷特性を示す図。The figure which shows the constant potential load characteristic of the electrode produced using the polymer transition metal complex compound (poly NiABEN) based on this invention.

Claims (1)

下記の化学式（１）で示される構成単位、または、化学式（１）の誘導体からなる構成単位を有する高分子遷移金属錯体化合物からなることを特徴とする電極活物質。
An electrode active material comprising a polymer transition metal complex compound having a structural unit represented by the following chemical formula (1) or a structural unit composed of a derivative of the chemical formula (1).
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