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Publication
Featured researches published by Jong Jan Lee.
Journal of the American Chemical Society | 2015
Long Wang; Jie Song; Ruimin Qiao; L. Andrew Wray; Muhammed A. Hossain; Yi-De Chuang; Wanli Yang; Yuhao Lu; David A. Evans; Jong Jan Lee; Sean Vail; Xin Zhao; Motoaki Nishijima; Seizoh Kakimoto; John B. Goodenough
A novel air-stable sodium iron hexacyanoferrate (R-Na1.92Fe[Fe(CN)6]) with rhombohedral structure is demonstrated to be a scalable, low-cost cathode material for sodium-ion batteries exhibiting high capacity, long cycle life, and good rate capability. The cycling mechanism of the iron redox is clarified and understood through synchrotron-based soft X-ray absorption spectroscopy, which also reveals the correlation between the physical properties and the cell performance of this novel material. More importantly, successful preparation of a dehydrated iron hexacyanoferrate with high sodium-ion concentration enables the fabrication of a discharged sodium-ion battery with a non-sodium metal anode, and the manufacturing feasibility of low cost sodium-ion batteries with existing lithium-ion battery infrastructures has been tested.
Journal of the American Chemical Society | 2015
Jie Song; Long Wang; Yuhao Lu; Jue Liu; Bingkun Guo; Penghao Xiao; Jong Jan Lee; Xiao Qing Yang; Graeme Henkelman; John B. Goodenough
Sodium is globally available, which makes a sodium-ion rechargeable battery preferable to a lithium-ion battery for large-scale storage of electrical energy, provided a host cathode for Na can be found that provides the necessary capacity, voltage, and cycle life at the prescribed charge/discharge rate. Low-cost hexacyanometallates are promising cathodes because of their ease of synthesis and rigid open framework that enables fast Na(+) insertion and extraction. Here we report an intriguing effect of interstitial H2O on the structure and electrochemical properties of sodium manganese(II) hexacyanoferrates(II) with the nominal composition Na2MnFe(CN)6·zH2O (Na2-δMnHFC). The newly discovered dehydrated Na2-δMnHFC phase exhibits superior electrochemical performance compared to other reported Na-ion cathode materials; it delivers at 3.5 V a reversible capacity of 150 mAh g(-1) in a sodium half cell and 140 mAh g(-1) in a full cell with a hard-carbon anode. At a charge/discharge rate of 20 C, the half-cell capacity is 120 mAh g(-1), and at 0.7 C, the cell exhibits 75% capacity retention after 500 cycles.
ACS Applied Materials & Interfaces | 2015
Wei Luo; Clement Bommier; Zelang Jian; Xin Li; Rich G. Carter; Sean Vail; Yuhao Lu; Jong Jan Lee; Xiulei Ji
Na-ion batteries are emerging as one of the most promising energy storage technologies, particularly for grid-level applications. Among anode candidate materials, hard carbon is very attractive due to its high capacity and low cost. However, hard carbon anodes often suffer a low first-cycle Coulombic efficiency and fast capacity fading. In this study, we discover that doping graphene oxide into sucrose, the precursor for hard carbon, can effectively reduce the specific surface area of hard carbon to as low as 5.4 m(2)/g. We further reveal that such doping can effectively prevent foaming during caramelization of sucrose and extend the pyrolysis burnoff of sucrose caramel over a wider temperature range. The obtained low-surface-area hard carbon greatly improves the first-cycle Coulombic efficiency from 74% to 83% and delivers a very stable cyclic life with 95% of capacity retention after 200 cycles.
Archive | 1998
David R. Evans; Sheng Teng Hsu; Jong Jan Lee
Archive | 2004
Allen Burmaster; David R. Evans; Jong Jan Lee; Jer-shen Maa; Ten Suu Shien; Douglas J. Tweet; ダブリュー. バーマスター アレン; シェン マー ジェー; テン スー シェン; ジャン リー ジョン; ジェイ. トゥイート ダグラス; アール. エバンス デビット
Archive | 2006
Jong Jan Lee; Jer-shen Maa; Douglas J. Tweet; Sheng Teng Hsu
Archive | 2004
Jong Jan Lee; Jer-shen Maa; Ten Suu Shien; Douglas J. Tweet; シェン マー ジェー; テン スー シェン; ジャン リー ジョン; ジェイ. トゥイート ダグラス
Archive | 2004
Jong Jan Lee; Jer-shen Maa; Ten Suu Shien; Douglas J. Tweet; テン スー シェン; セン マー ジャ; ジャン リー ジョン; ジェー. ツイート ダグラス
Archive | 2004
Jong Jan Lee; Jer-shen Maa; Ten Suu Shien; Douglas J. Tweet; シェン マー ジェー; テン スー シェン; ジャン リー ジョン; ジェイ. トゥイート ダグラス
Archive | 1998
David R. Evans; Jong Jan Lee; Sheng Teng Hsu