Carbon Electrodes for K-Ion Batteries
Zelang JianDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, United StatesWei LuoDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, United StatesXiulei JiDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, United States
2015en
ABI
Abstract
We for the first time report electrochemical potassium insertion in graphite in a nonaqueous electrolyte, which can exhibit a high reversible capacity of 273 mAh/g. Ex situ XRD studies confirm that KC36, KC24, and KC8 sequentially form upon potassiation, whereas depotassiation recovers graphite through phase transformations in an opposite sequence. Graphite shows moderate rate capability and relatively fast capacity fading. To improve the performance of carbon K-ion anodes, we synthesized a nongraphitic soft carbon that exhibits cyclability and rate capability much superior to that of graphite. This work may open up a new paradigm toward rechargeable K-ion batteries.
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