JP2007305626A - 蓄電システム - Google Patents
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- JP2007305626A JP2007305626A JP2006129399A JP2006129399A JP2007305626A JP 2007305626 A JP2007305626 A JP 2007305626A JP 2006129399 A JP2006129399 A JP 2006129399A JP 2006129399 A JP2006129399 A JP 2006129399A JP 2007305626 A JP2007305626 A JP 2007305626A
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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
-
- 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
- Y02E60/13—Energy storage using capacitors
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- Electric Double-Layer Capacitors Or The Like (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
【解決手段】有機電解液中に正電極および負電極が浸されてなる蓄電システムにおいて、該有機電解液がリチウム塩を溶質の少なくとも一部として含有し、該正電極が電極活物質として黒鉛質材料を有し、該負電極が電極活物質としてリチウムの吸蔵あるいはインターカレーション/脱インターカレーションが可能な炭素質材料を有する、蓄電システム。
【選択図】なし
Description
有機電解液中に正電極および負電極が浸されてなる蓄電システムにおいて、
該有機電解液がリチウム塩を溶質の少なくとも一部として含有し、
該正電極が電極活物質として黒鉛質材料を有し、
該負電極が電極活物質としてリチウムイオンの吸蔵あるいはインターカレーション/脱インターカレーションが可能な炭素質材料を有する、蓄電システムを提供するものであり、そのことにより上記目的が達成される。
R(%)=(I(101−R)/I(101−H))×100 (1)
[式中、I(101−R)はX線結晶回折スペクトルにおける菱面体晶(101)面に帰属するピークの積分強度であり、I(101−H)はX線結晶回折スペクトルにおける六方晶(101)面に帰属するピークの積分強度である。]
黒鉛粒子1〜4は、中国産の天然黒鉛をメディアを用いて摩砕することにより平均粒子径が5ミクロン程度となるように調整し、得られた薄片化黒鉛粒子を更に磨砕することで、菱面体晶の割合を表3のように調整したものである。
(1)X線結晶解析
X線回折装置(株式会社リガク製「RINT-UltimaIII」)を用い、黒鉛類粒子を測定した。得られたX線回折スペクトルを分析して、(002)面の結晶格子定数(C0(002))、平均面間隔d002、及び(002)ピーク(2θ=26.5°付近にあるピーク)の半値幅を決定した。ターゲットをCuKαとし、40kV、200mAにて測定を行った。
負電極用炭素質材料として、メソフェーズカーボンピッチ(MCMB)系黒鉛粒子(大阪ガス社製)、メソフェーズカーボンファイバー(MCF)系黒鉛粒子(ペトカ社製)、天然黒鉛粒子(日本黒鉛製、ハードカーボン(呉羽化学社製)、及びBET法による表面積が1700m2の活性炭粒子(武田薬品工業製)を準備した。
A)CVDによる処理:900から1100℃に昇温された炉内の石英製キュベットに電極活物質粒子を静置し、これにアルゴンガスをキャリアとしてベンゼン蒸気を導入し、キシレンを黒鉛上に析出炭化させる。析出炭素量を種々変更し実施した。
B)樹脂被覆処理:ベークライト樹脂の溶液(群栄化学:レジトップ)を種々の濃度に調整した。次に電極活物質粒子をこれら溶液に浸し、乾燥した。窒素気流中にて600℃で焼成し、樹脂を炭化した。
(1)電極の製造
正電極:
電極活物質3g、アセチレンブラック0.3g、及びポリビニリデンフロリド(PVDF)溶液(呉羽化学社製)1.0gを混合し、小型ニーダーを用いて混練した。成形装置を用いて、混練物を0.4mmから0.5mmの均一な厚みのシート状に成形して正電極を得た。
負電極:
電極活物質3g、アセチレンブラック0.3g、及びポリビニリデンフロリド(PVDF)溶液(呉羽化学社製)1.0gを混合し、小型ニーダーを用いて混練した。成形装置を用いて、混練物を0.4mmから0.5mmの均一な厚みのシート状に成形して負電極を得た。
電極の目付け重量は、正負極がほぼ同等となるように調整した。
得られた各炭素シートを20mmΦのディスクに打ち抜き、図1に示すような、3電極セルに組み立てた。その際、集電極として正電極にはアルミニウム箔を用い、負電極には銅を用いた。セパレーターとしてガラスフィルタを用いた。参照電極は#1711活性炭を上記と同様の方法にてシート化したものを用いた。このセルを真空中140℃で24時間乾燥し冷却した。六フッ化燐酸リチウムをエチレンカーボネート(EC)とジメチルカーボネート(DMC)の混合溶媒に1.0モル%となるように溶解させて電解液を調製した。そして、得られた電解液をセルに注入して試験セルを作製した。
組み立てた蓄電システムにパワーシステム製充放電試験装置「CDT−RD20」を接続し、5mAにて7200秒間の定電流充電を行い、設定電圧に到達した後、5mAにての定電流放電を行った。最大電圧は5.0Vとし、3.0Vまでの充放電を3サイクル実施し3サイクル目のデータを採用した。
放電電力より容量(mAh/g)を算出した。
ついで、周囲の温度を60℃に上昇させ、上記条件の充放電を100サイクル行った。容量維持率(%)を測定した。
これら試験結果を表4に示す。
2…トップカバー、
3…スプリング、
4、8…集電極、
5、7…炭素質電極、
6…セパレータ、
9…ガイド、
10、13…Oリング、
12…本体、
14…押え板、
15…参照電極、
16…ボトムカバー。
Claims (6)
- 有機電解液中に正電極および負電極が浸されてなる蓄電システムにおいて、
該有機電解液がリチウム塩を溶質の少なくとも一部として含有し、
該正電極が電極活物質として黒鉛質材料を有し、
該負電極が電極活物質としてリチウムの吸蔵あるいはインターカレーション/脱インターカレーションが可能な炭素質材料を有する、蓄電システム。 - 有機電解液中に正電極および負電極が浸されてなる蓄電システムにおいて、
該有機電解液がリチウム塩を溶質の少なくとも一部として含有し、
該正電極が電極活物質として、リチウムイオンの吸蔵あるいはインターカレーション/脱インターカレーションが可能な黒鉛質材料を有し、
該負電極が電極活物質として、カチオンが吸着可能な活性炭を有する、蓄電システム。 - 前記正電極の黒鉛質材料がカーボン結晶構造中に存在する菱面体晶構造の割合が30%以上である黒鉛粒子である請求項1又は2記載の蓄電システム。
- 前記正電極の黒鉛質材料が、非多孔性炭素粒子及び黒鉛粒子からなる群から選択されるコア黒鉛粒子と該コア黒鉛粒子を被覆する炭素層とを有する黒鉛質複合粒子である請求項1又は2記載の蓄電システム。
- 前記負電極の炭素質材料が、黒鉛粒子又は黒鉛粒子と該黒鉛粒子を被覆する炭素層とを有する黒鉛質複合粒子である請求項1記載の蓄電システム。
- 前記負電極の炭素質材料が、ソフトカーボン系粒子又はハードカーボン系粒子である請求項1記載の蓄電システム。
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JP2006129399A JP3953502B1 (ja) | 2006-05-08 | 2006-05-08 | 蓄電システム |
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JP2010219036A (ja) * | 2009-02-20 | 2010-09-30 | Mitsubishi Chemicals Corp | リチウムイオン二次電池用炭素材料 |
JP2010251314A (ja) * | 2009-03-27 | 2010-11-04 | Mitsubishi Chemicals Corp | 非水電解液二次電池用負極材料及びこれを用いた非水電解液二次電池 |
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JP2013258392A (ja) * | 2012-05-18 | 2013-12-26 | Jsr Corp | 電極活物質、電極及び蓄電デバイス |
JP2014110371A (ja) * | 2012-12-04 | 2014-06-12 | Jm Energy Corp | 蓄電デバイス |
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JP2015130324A (ja) * | 2013-12-05 | 2015-07-16 | 株式会社リコー | 非水電解液二次電池 |
JP2016201295A (ja) * | 2015-04-13 | 2016-12-01 | 日新電機株式会社 | 蓄電デバイス |
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