Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2949-2954Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201470j
Keywords
Silicon hollow sphere electrode; energy storage; lithium induced stress; volume expansion
Categories
Funding
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231, 6951379]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering through the SLAC National Accelerator Laboratory LDRD [DE-AC02-76SF0051]
- King Abdullah University of Science and Technology (KAUST) [KUS-l1-001-12]
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-FG02-04ER46163]
- Chevron Stanford Graduate Fellowship
- National Science Foundation
- National Defense Science and Engineering Graduate Fellowship
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Silicon is a promising candidate for the anode material in lithium-ion batteries due to its high theoretical specific capacity. However, volume changes during cycling cause pulverization and capacity fade, and improving cycle life is a major research challenge. Here, we report a novel interconnected Si hollow nanosphere electrode that is capable of accommodating large volume changes without pulverization during cycling. We achieved the high initial discharge capacity of 2725 mAh g(-1) with less than 8% capacity degradation every hundred cycles for 700 total cycles. Si hollow sphere electrodes also show a Coulombic efficiency of 99.5% in later cycles. Superior rate capability is demonstrated and attributed to fast lithium diffusion in the interconnected Si hollow structure.
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