Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 42, Pages 21098-21103Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta07576j
Keywords
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Funding
- Research project of environmental protection in Jiangsu province [2016060]
- National Basic Research Program of China [2014CB239702]
- Program of National Natural Science Foundation of China [21501120]
- Research project of Hubei Geological Bureau [KJ2017-27]
- Science and Technology Commission of Shanghai Municipality [14DZ2250800]
- Plan for Scientific Innovation Talent of Henan Province [174200510017]
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The rate capability of battery-type anode materials has become a great limitation to the energy and power densities of lithium-ion capacitors. Besides the electronic conductivity, it is crucial to enhance the electrochemical rate by facilitating the diffusion and transportation of Li+. Herein, a new kind of porous Si@C ball-in-ball hollow structure was designed to build a stable electrode-electrolyte interface, overcome the volume change of Si and enhance the mass diffusion and conductivity simultaneously. The obtained porous Si@C ball-in-ball hollow spheres as Si anodes show great cycling stability for 1000 cycles and good rate capability with 943 and 586 mA h g(-1) at 16.0 and 32.0 A g(-1), respectively. As a result, lithium-ion capacitors based on porous Si@C ball-in-ball hollow spheres as anode materials give high energy densities of 239 and 154 W h kg(-1) at the power densities of 1376 and similar to 69 600 W kg(-1), respectively. Furthermore, the lithium-ion capacitors also show a stable cycling performance for 15 000 cycles at 6.4 A g(-1).
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