JP2021039935A - 亜鉛‐臭素電池用正極およびその製造方法 - Google Patents
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Abstract
【解決手段】ピリジン系窒素でドープされた炭素体を含む、無隔膜‐無フロー型亜鉛‐臭素電池用の正極。前記炭素体は、平均気孔径0.2〜3nmの微細気孔を含む微多孔性炭素体である。
【選択図】図1
Description
(S1)多孔性炭素体基材を親水化表面処理するステップと、
(S2)金属前駆体および有機リガンド前駆体を含む溶液に前記親水化された多孔性炭素体基材を浸漬するステップと、
(S3)前記浸漬された多孔性炭素体基材を乾燥し、多孔性炭素体基材上に金属‐有機骨格体(MOF)を含むナノ結晶性多面体をコーティングするステップと、
(S4)前記ナノ結晶性多面体がコーティングされた多孔性炭素体基材を炭化するステップとを含む。
ZIF‐8‐GF(Graphite felt、GF)の製造:
a)20×30×4mmの黒鉛フェルト(Graphite felt)(GFD 4.6、SGL Group)を酸素条件の下で、520℃、9時間熱処理を行った後、常温まで冷却させた。
前記得られたZIF‐8‐GFをAr条件および5℃/minの昇温速度で700℃で5時間炭化した後、常温まで冷却した。次に、2Mの塩酸が入っているビーカに入れて60℃で12時間攪拌してNGFを取得し、最後に、蒸留水100mL、エタノール100mLおよびアセトン100mLの順にそれぞれ洗浄した後、100℃で12時間乾燥し、NGF‐700を得た。
前記実施例1で炭化温度を700℃の代わりに、600℃にした以外は、同様に実施し、得られたNGFをNGF‐600と名付けた。
前記実施例1で炭化温度を700℃の代わりに、800℃にした以外は、同様に実施し、得られたNGFをNGF‐800と名付けた。
前記実施例1で炭化温度を700℃の代わりに、900℃にした以外は、同様に実施し、得られたNGFをNGF‐900と名付けた。
前記実施例1で炭化温度を700℃の代わりに、1000℃にした以外は、同様に実施し、得られたNGFをNGF‐1000と名付けた。
20×30×4mmのPristineグラファイトフェルト(GFD 4.6、SGL Group)を使用し、GFと名付けた。
前記実施例1〜実施例5で製造されたNGFに対して走査電子顕微鏡画像およびEDSを分析し、その結果を図5に図示した。
前記実施例1〜実施例5で製造されたNGFに対してXPS分析を行い、その結果を図6に図示した。
前記実施例1〜実施例5で製造されたNGFに対してBET比表面積分析を行い、その結果を図7に図示した。
前記実施例1〜実施例5で製造されたNGFに対してAr吸着等温線分析を行い、その結果を図8に図示した。
前記実施例1〜実施例5のうち、ピリジン系窒素含量(原子%)が最も高いNGF‐700(実施例1);比表面積が最も高いNGF‐1000(実施例5);およびGF(比較例)に対して臭素系イオンおよび臭素化合物の吸着能を評価した。
前記実施例1により製造されたNGF‐700;実施例5により製造されたNGF‐1000;および比較例によるGFをそれぞれ1×1cm2サイズで切断した後、作業電極として使用し、相対電極を白金電極、基準電極としてAg/AgCl電極、また、電解液として2.25M ZnBr2を使用して、周波数範囲1000kHz〜0.01Hzおよび振幅10mVの条件でEIS分析を行い、その結果を図11に図示した。
前記実施例1により製造されたNGF‐700;実施例5により製造されたNGF‐1000;および比較例によるGFをそれぞれ正極として使用し、2×2×2cm3サイズの長方形石英管(Rectangular quartz tube)に配置し、Znコーティングされた白金電極を負極として使用し、電解液は、pH3.8の2.25M ZnBr2を使用して、MLFL‐ZBBセル(Cell)を構成した。
前記1000サイクル充放電を行った後、正極および負極の劣化程度を分析するために、正極、負極および電解液をそれぞれ観察し、その画像を図13に図示した。
Claims (15)
- ピリジン系窒素でドープされた炭素体を含む、亜鉛‐臭素電池用正極。
- 前記亜鉛‐臭素電池は、無隔膜‐無フロー型亜鉛‐臭素電池である、請求項1に記載の亜鉛‐臭素電池用正極。
- 前記ピリジン系窒素でドープされた炭素体は、微細気孔を含む微多孔性炭素体である、請求項1に記載の亜鉛‐臭素電池用正極。
- 前記微細気孔の平均気孔径は、0.2〜3nmである、請求項3に記載の亜鉛‐臭素電池用正極。
- 前記ピリジン系窒素は、窒素ドープされた炭素体の総窒素含量に対して30原子%以上である、請求項1に記載の亜鉛‐臭素電池用正極。
- 前記ピリジン系窒素は、正に荷電したピリジン系窒素である、請求項1に記載の亜鉛‐臭素電池用正極。
- 前記ピリジン系窒素でドープされた炭素体は、多孔性炭素体基材をさらに含み、前記多孔性炭素体基材とピリジン系窒素でドープされた炭素体は一体化している、請求項1に記載の亜鉛‐臭素電池用正極。
- 前記ピリジン系窒素でドープされた炭素体と臭素系アニオンの吸着エネルギーは、下記式1を満たす、請求項1に記載の亜鉛‐臭素電池用正極。
- 亜鉛がコーティングされた遷移金属を含む負極と、請求項1から8のいずれか一項に記載の正極と、電解質とを含み、前記電解質のpHは1.5〜5である、亜鉛‐臭素電池。
- 前記亜鉛‐臭素電池は、開回路電圧の降下が40時間以上で発生する、請求項9に記載の亜鉛‐臭素電池。
- 前記亜鉛‐臭素電池は、1000充放電サイクルの際、エネルギー効率が70%以上である、請求項9に記載の亜鉛‐臭素電池。
- (S1)多孔性炭素体基材を親水化表面処理するステップと、
(S2)金属前駆体および有機リガンド前駆体を含む溶液に前記親水化された多孔性炭素体基材を浸漬するステップと、
(S3)前記浸漬された多孔性炭素体基材を乾燥し、多孔性炭素体基材上に金属‐有機骨格体(MOF)を含むナノ結晶性多面体をコーティングするステップと、
(S4)前記ナノ結晶性多面体がコーティングされた多孔性炭素体基材を炭化するステップとを含む、亜鉛‐臭素電池用正極の製造方法。 - 前記金属‐有機骨格体は、ゼオライトイミダゾレート骨格体(ZIF)である、請求項12に記載の亜鉛‐臭素電池用正極の製造方法。
- 前記(S4)ステップの炭化過程は、500〜1200℃で行われる、請求項12に記載の亜鉛‐臭素電池用正極の製造方法。
- 前記(S1)ステップの親水化表面処理過程は、400〜800℃の酸化雰囲気で行われる、請求項12に記載の亜鉛‐臭素電池用正極の製造方法。
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