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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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高性能リチウムイオン電池アノドのためのメソポラスTiO2ホロー球のグラフィティックカーボンコンフォーマルコーティング
Hao Liu1, Wei Li2, Dengke Shen2
1Centre for Clean Energy Technology, School of Mathematics and Physical Sciences, Faculty of Science, University of Technology Sydney , Sydney, New South Wales 2007, Australia.
Journal of the American Chemical Society
|September 29, 2015
まとめ
研究者らは,高度なリチウムイオン電池用の空洞の二酸化チタン/グラフィット炭素 (H-TiO2/GC) を開発した. これらの新しいアノド材料は,優れた安定性と電気化学性能を示し,次世代のエネルギー貯蔵ソリューションの道を開いています.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- リチウムイオン電池の性能を高めるには,TiO2ベースの材料の合理的な設計が不可欠です.
- アノド材料でユニークな微細構造と高電気化学反応性を達成することは,依然として重要な課題です.
- TiO2をエネルギー貯蔵用途に最適化するには,制御可能な合成方法が必要です.
研究 の 目的:
- 空洞のTiO2 / グラフィット炭素 (H-TiO2 / GC) の汎用合成経路を開発する.
- 合成されたH-TiO2/GCの空洞球の構造と電気化学的性質を調査する.
- リチウムイオン電池の高性能アノド材料としてのH-TiO2/GCの可能性を評価する.
主な方法:
- メソポラスなH-TiO2 / GCの空洞球を作るために,多用途の合成経路が使用されました.
- 特徴付けには,特定の表面積,毛穴の容量,毛穴の大きさ,および空洞構造の寸法に関する分析が含まれていた.
- リチウムイオン電池のアノド材料としての電気化学性能は,特定の容量とサイクル安定性を含めて評価されました.
主要な成果:
- 合成されたH-TiO2/GCの空洞球は高特異表面積 (298 m2/g) と高孔量 (0.31 cm3/g) を示した.
- 600 nmの大きさと100 nmの殻の厚さを持つ明確に定義された空洞構造が達成されました.
- アナタゼTiO2ナノ結晶 (∼8nm) は超薄なグラフィート炭素層に適合してカプセル化されました.
- 優れた電気化学反応性と安定性が実証され,1A/gで1000サイクル以上維持された特異容量は137mAh/gであった.
結論:
- メソポラスH-TiO2 / GCの空洞球はリチウムイオン電池の陽極材料として優れた電気化学性能を示しています.
- 独特の空洞構造とグラフィティックカーボン包装は,反応性と安定性を高めます.
- これらの発見は,次世代の高性能リチウムイオン電池にH-TiO2 / GC空洞球の有意な可能性を示唆しています.
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