JP2010055923A - 電極活物質、及び二次電池 - Google Patents
電極活物質、及び二次電池 Download PDFInfo
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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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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyamides (AREA)
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Abstract
Description
で表されることを特徴としている。
で表されることを特徴としている。
で表されることを特徴としている。
下記合成スキーム(5)に従い、ジシアノキノジイミン(以下、「DCNQI」という。)二量体(II)を作製した。
上記DCNQI二量体300mg、導電補助剤としてのグラファイト粉末600mg、結着剤としてのポリテトラフルオロエチレン樹脂100mgをそれぞれ秤量し、秤量物を均一に混合しながら混練した。この混合体を加圧成形し、厚さ約150μmのシート状部材を作製した。次に、このシート状部材を、真空中80℃で1時間乾燥した後、直径12mmの円形に打ち抜き、DCNQI二量体を主体とする正極(正極活物質)を作製した。
以上のように作製した二次電池を、0.1mAの定電流で電圧が4.0Vになるまで充電し、その後、0.1mAの定電流で2.0Vまで放電した。その結果、3.2V及び2.55Vの二箇所で充放電電圧を示し、放電容量が0.4mAhの二次電池であることが確認された。また、電極活物質当たりの放電容量(実容量密度)を求めたところ、200mAh/gであった。
DCNQI二量体とTCNQ二量体について、数式(1)に従い、理論容量密度Qを算出し、両者を比較した。
したがって、DCNQI二量体はTCNQ二量体に比べ、容量密度を約31%向上させることが可能であることが分かった。
合成スキーム(6)に従い、ジシアノキノジイミンの高分子(以下、「DCNQIポリマー」という。)を作製した。
電極活物質にDCNQIポリマーを使用した以外は、〔実施例1〕と同様の方法で二次電池を作製した。
〔実施例1〕と同様、この二次電池を、0.1mAの定電流で電圧が4.0Vになるまで充電し、その後、0.1mAの定電流で2.0Vまで放電した。その結果、この二次電池は3.1V及び2.5Vの二箇所で充放電電圧を示し、放電容量が0.19mAhの二次電池であることが確認された。また、電極活物質当たりの放電容量(実容量密度)を求めたところ、180mAh/gであった。
DCNQIポリマーとTCNQポリマーについて、理論容量密度Qを上記数式(1)に基づいて算出し、両者を比較した。尚、TCNQポリマーは、DCNQI構造をTCNQ構造にした点を除き、同一の高分子構造を有している。
〔実施例1〕と同様、この二次電池を、0.1mAの定電流で電圧が4.0Vになるまで充電し、その後、0.1mAの定電流で2.0Vまで放電した。その結果、この二次電池は3.3V及び2.8Vの二箇所で充放電電圧を示し、放電容量が0.45mAhの二次電池であることが確認された。また、電極活物質当たりの放電容量(実容量密度)を求めたところ、180mAh/gであった。
DCNQI−OMe2と2,5−ジメチル−N,N’-ジシアノキノジメタン(以下、「TCNQ−OMe2」という。)について、理論容量密度Qを上記数式(1)に基づいて算出し、両者を比較した。
Claims (9)
- 電池電極反応によって充放電を繰り返す二次電池の活物質として使用される電極活物質であって、
シアノキノジイミン構造を構成単位として含有した有機化合物を主体としていることを特徴とする電極活物質。 - 前記有機化合物は、一般式
で表されることを特徴とする請求項1記載の電極活物質。 - 前記有機化合物は、一般式
で表されることを特徴とする請求項1又は請求項2記載の電極活物質。 - 前記有機化合物は、一般式
で表されることを特徴とする請求項1乃至請求項3のいずれかに記載の電極活物質。 - 前記有機化合物は、分子量が200以上であることを特徴とする請求項1乃至請求項4記載の電極活物質。
- 前記有機化合物は、1.2〜4.2Vvs.Li/Li+の範囲に2つ以上の酸化還元電位を有することを特徴とする請求項1乃至請求項5のいずれかに記載の電極活物質。
- 電池電極反応により充放電を行う二次電池であって、
前記請求項1乃至請求項6のいずれかに記載の電極活物質が、前記電池電極反応の少なくとも放電反応における反応出発物、生成物及び中間生成物のうちのいずれかに含まれることを特徴とする二次電池。 - 前記放電反応は、少なくとも2つ以上の放電電圧を有することを特徴とする請求項7記載の二次電池。
- 正極、負極、及び電解質を有し、前記正極が、前記電極活物質を主体としていることを特徴とする請求項7又は請求項8記載の二次電池。
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JP2012190545A (ja) * | 2011-03-08 | 2012-10-04 | Waseda Univ | ジシアノアントラキノンジイミンポリマー、電荷貯蔵材料、電極活物質、電極及び電池 |
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