Potassium Ion Batteries with Graphitic Materials

Luo，Wei1; Wan，Jiayu2; Ozdemir，Burak3; Bao，Wenzhong1; Chen，Yanan1; Dai，Jiaqi1; Lin，Hao1; Xu，Yue1; Gu，Feng1; Barone，Veronica3; Hu，Liangbing1

2015-11-11

10.1021/acs.nanolett.5b03667

NANO LETTERS   影响因子和分区

1530-6984

1530-6992

Graphite intercalation compounds (GICs) have attracted tremendous attention due to their exceptional properties that can be finely tuned by controlling the intercalation species and concentrations. Here, we report for the first time that potassium (K) ions can electrochemically intercalate into graphitic materials, such as graphite and reduced graphene oxide (RGO) at ambient temperature and pressure. Our experiments reveal that graphite can deliver a reversible capacity of 207 mAh/g. Combining experiments with ab initio calculations, we propose a three-step staging process during the intercalation of K ions into graphite: C → KC (Stage III) → KC (Stage II) → KC (Stage I). Moreover, we find that K ions can also intercalate into RGO film with even higher reversible capacity (222 mAh/g). We also show that K ions intercalation can effectively increase the optical transparence of the RGO film from 29.0% to 84.3%. First-principles calculations suggest that this trend is attributed to a decreased absorbance produced by K ions intercalation. Our results open opportunities for novel nonaqueous K-ion based electrochemical battery technologies and optical applications.

band structure modulation batteries first-principles graphitic materials Potassium ions intercalation

SCI

英语

NI期刊 ; NI论文 ; ESI高被引

非南科大

WOS:000364725400075

MATERIALS SCIENCE

2-s2.0-84946887549

Scopus

1.Department of Materials Science and Engineering,University of Maryland,College Park,20742,United States
2.Department of Mechanical Engineering,University of Maryland,College Park,20742,United States
3.Department of Physics and Science of Advanced Materials Program,Central Michigan University,Mount Pleasant,48859,United States

Luo，Wei,Wan，Jiayu,Ozdemir，Burak,et al. Potassium Ion Batteries with Graphitic Materials[J]. NANO LETTERS,2015,15(11):7671-7677.

Luo，Wei.,Wan，Jiayu.,Ozdemir，Burak.,Bao，Wenzhong.,Chen，Yanan.,...&Hu，Liangbing.(2015).Potassium Ion Batteries with Graphitic Materials.NANO LETTERS,15(11),7671-7677.

Luo，Wei,et al."Potassium Ion Batteries with Graphitic Materials".NANO LETTERS 15.11(2015):7671-7677.