Journal
NANO TODAY
Volume 7, Issue 3, Pages 168-173Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2012.04.004
Keywords
Energy storage; Li -ion batteries; Electrochemistry; Positive electrode; Composite materials
Categories
Funding
- Energy Efficiency and Resources R&D program under the Ministry of Knowledge Economy, Republic of Korea [20112020100070]
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Knowledge Economy [20114010203120]
- Converging Research Center Program through the Ministry of Education, Science and Technology [2011K000691]
- Northeastern Center for Chemical Energy Storage
- Energy Frontier Research Center
- U.S. DOE, BES [DE-SC0001294]
- U.S. Department of Energy (DOE) [DE-SC0001294] Funding Source: U.S. Department of Energy (DOE)
- Korea Evaluation Institute of Industrial Technology (KEIT) [20114010203120, 20112020100070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The quest for new positive electrodes for rechargeable lithium-ion batteries has been escalating in recent years. Until now, candidates of positive electrode were limited to crystals that contain both redox-active element (usually transition-metal) and lithium ion in the open framework with few exceptions. Here, we demonstrate lithium-free compounds, a material with little activity by itself, can be activated electrochemically by addition of LiF after the first charging. This general strategy is exemplified in various lithium-free iron compounds. Reversible lithium ion extraction and reinsertion take place for Fe2+F2, Fe2+ SO4, and Fe22+P2O7, when blended with LiF in nanoscale, in which a simultaneous valence change of Fe2+/3+ occurs above 3 V. FeF2-LiF could deliver 190 mAh g(-1) (similar to 3.53 V) at 50 mA g(-1) which is even higher energy density than that crystalline LiFePO4 can offer. Various combinations of blending are possible using this approach, which can bring a new branch of material group for positive electrodes in lithium-ion batteries. (C) 2012 Elsevier Ltd. All rights reserved.
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