先進的なナトリウムイオンカソッドとして高ナトリウム含有量P2型層状酸化物を明らかにする
Chenglong Zhao1,2, Zhenpeng Yao3, Qidi Wang4,5
1Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|March 3, 2020
まとめ
P2型層酸化物の高いナトリウム含有量は,ナトリウムイオン電池の構造的安定性と電気化学的性能を高めます. この発見により,ナイオンモビリティが向上し,高度なカトド材料のサイクル寿命が延長されます.
科学分野:
- 材料科学
- 電気化学
- 無機化学
背景:
- 層状のナトリウム基酸化物 (NaTMO2) は,調節可能な性質のため,ナトリウムイオン電池にとって重要である.
- 構成の多様性は構造化学,イオン伝導性,および酸化還元活性に影響する.
研究 の 目的:
- P2型層酸化物の最大ナトリウム含有量の影響を調査する.
- 構造の安定性や電気化学的性能に 高いNa含有量がどのように影響するかを理解する.
主な方法:
- 異なるNa含有量のP2型層酸化物組成物の探査
- 構造的安定性,ナイオン伝導性,そして酸化還元性の分析.
- 貯蔵容量とサイクル寿命を評価するための電気化学試験
主要な成果:
- 高ナトリウム含有量は構造の安定性を高め,カチオン酸化を促進する (Ni2+はより高い状態になる).
- O{2p) -TM{3d-eg*) のハイブリッド化が増加すると,ナイオンモビリティと貯蔵能力が向上する (>100 mAh g-1).
- 材料は,有害なP2-O2構造的移行を防止することによって,超長サイクルの寿命 (3000サイクル) を表しています.
結論:
- 高ナトリウム含量P2型材料は,ナトリウムイオン電池カトッドに優れた電気化学性能を提供します.
- 先進的なカトド材料の電子と構造化学に関する新しい洞察を 提供しています
- この研究により,エネルギー貯蔵用の高ナトリウムP2型層酸化物の可能性が拡大されます.
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