期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 20, 期 48, 页码 30290-30296出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cp05484c
关键词
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资金
- National Natural Science Foundation of China [51631004]
Sodium-ion batteries (NIBs) and potassium-ion batteries (KIBs) have attracted increasing attention due to the high cost and finite abundance of lithium. Here, by using first-principles calculations, monolayer -GeSe has been found to be a promising anode material with a capacity of 353.65 mA h g(-1) for both NIBs and KIBs. Additionally, the diffusions of Na and K over the monolayer -GeSe are ultrafast with small energy barriers of 0.080/0.125 eV and 0.052/0.047 eV for the Ge/Se side, respectively, indicating excellent rate performance. Monolayer -GeSe has low open circuit voltages of 0.219 V (vs. Na/Na+) and 0.030 V (vs. K/K+), which implies that the NIBs and KIBs could have high energy densities due to the high working voltages between the anode and cathode. Therefore, monolayer -GeSe as an anode material for NIBs and KIBs with excellent performance shows tremendous potential in the energy field.
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