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Title: Self-Templated Formation of P2-type K 0.6CoO 2 Microspheres for High Reversible Potassium-Ion Batteries

Abstract

We report that layered metal oxides have been widely used as the best cathode materials for commercial lithium-ion batteries and are being intensively explored for sodium-ion batteries. However, their application to potassium-ion batteries (PIBs) is hampered because of the poor cycling stability and low rate capability due to the larger ionic size of K + than of Li + or Na +. Herein, a facile self-templated strategy was used to synthesize unique P2-type K 0.6CoO 2 microspheres that consist of aggregated primary nanoplates as PIB cathodes. The unique K 0.6CoO 2 microspheres with aggregated structure significantly enhanced the kinetics of the K + intercalation/deintercation and also minimized the parasitic reactions between the electrolyte and K 0.6CoO 2. The P2-K 0.6CoO 2 microspheres demonstrated a high reversible capacity of 82 mAh g –1 at 10 mA g –1, high rate capability of 65 mAh g –1 at 100 mA g –1, and long cycle life (87% capacity retention over 300 cycles). The high reversibility of the P2-K 0.6CoO 2 full cell paired with a hard carbon anode further demonstrated the feasibility of PIBs. Lastly, this work not only successfully demonstrates exceptional performance of P2-type K 0.6CoO 2 cathodes and microspheres Kmore » 0.6CoO 2∥hard carbon full cells, but also provides new insights into the exploration of other layered metal oxides for PIBs.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Maryland, College Park, MD (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Nanostructures for Electrical Energy Storage (NEES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470232
Grant/Contract Number:  
SC0001160
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Related Information: NEES partners with University of Maryland (lead); University of California, Irvine; University of Florida; Los Alamos National Laboratory; Sandia National Laboratories; Yale University; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; bio-inspired; energy storage (including batteries and capacitors); defects; charge transport; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing); Cathode material; layered metal oxides; K0.6CoO2; high reversibility; potassium-ion battery

Citation Formats

Deng, Tao, Fan, Xiulin, Luo, Chao, Chen, Ji, Chen, Long, Hou, Singyuk, Eidson, Nico, Zhou, Xiuquan, and Wang, Chunsheng. Self-Templated Formation of P2-type K0.6CoO2 Microspheres for High Reversible Potassium-Ion Batteries. United States: N. p., 2018. Web. doi:10.1021/acs.nanolett.7b05324.
Deng, Tao, Fan, Xiulin, Luo, Chao, Chen, Ji, Chen, Long, Hou, Singyuk, Eidson, Nico, Zhou, Xiuquan, & Wang, Chunsheng. Self-Templated Formation of P2-type K0.6CoO2 Microspheres for High Reversible Potassium-Ion Batteries. United States. doi:10.1021/acs.nanolett.7b05324.
Deng, Tao, Fan, Xiulin, Luo, Chao, Chen, Ji, Chen, Long, Hou, Singyuk, Eidson, Nico, Zhou, Xiuquan, and Wang, Chunsheng. Tue . "Self-Templated Formation of P2-type K0.6CoO2 Microspheres for High Reversible Potassium-Ion Batteries". United States. doi:10.1021/acs.nanolett.7b05324. https://www.osti.gov/servlets/purl/1470232.
@article{osti_1470232,
title = {Self-Templated Formation of P2-type K0.6CoO2 Microspheres for High Reversible Potassium-Ion Batteries},
author = {Deng, Tao and Fan, Xiulin and Luo, Chao and Chen, Ji and Chen, Long and Hou, Singyuk and Eidson, Nico and Zhou, Xiuquan and Wang, Chunsheng},
abstractNote = {We report that layered metal oxides have been widely used as the best cathode materials for commercial lithium-ion batteries and are being intensively explored for sodium-ion batteries. However, their application to potassium-ion batteries (PIBs) is hampered because of the poor cycling stability and low rate capability due to the larger ionic size of K+ than of Li+ or Na+. Herein, a facile self-templated strategy was used to synthesize unique P2-type K0.6CoO2 microspheres that consist of aggregated primary nanoplates as PIB cathodes. The unique K0.6CoO2 microspheres with aggregated structure significantly enhanced the kinetics of the K+ intercalation/deintercation and also minimized the parasitic reactions between the electrolyte and K0.6CoO2. The P2-K0.6CoO2 microspheres demonstrated a high reversible capacity of 82 mAh g–1 at 10 mA g–1, high rate capability of 65 mAh g–1 at 100 mA g–1, and long cycle life (87% capacity retention over 300 cycles). The high reversibility of the P2-K0.6CoO2 full cell paired with a hard carbon anode further demonstrated the feasibility of PIBs. Lastly, this work not only successfully demonstrates exceptional performance of P2-type K0.6CoO2 cathodes and microspheres K0.6CoO2∥hard carbon full cells, but also provides new insights into the exploration of other layered metal oxides for PIBs.},
doi = {10.1021/acs.nanolett.7b05324},
journal = {Nano Letters},
issn = {1530-6984},
number = 2,
volume = 18,
place = {United States},
year = {2018},
month = {1}
}

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