High-stability tin/carbon battery electrodes produced using reduction expansion synthesis
Author
Lee, Tongli Lim
Adams, Ryan A.
Luhrs, Claudia
Arora, Anjela
Pol, Vilas G.
Wu, Chun-Hsien
Phillips, Jonathan
Date
2018Metadata
Show full item recordAbstract
This study shows high stability Sn (10wt %)/carbon Li-ion battery anodes can be made via the Reduction
Expansion Synthesis (RES) process. Hybrid Sn/C anodes had an initial capacity of 425 mAh g-1 which
stabilized to ~340 mAh g-1 after less than 10 cycles. Unlike earlier Sn/C anodes, capacity remained
virtually constant for more than 180 additional cycles. Neat carbon independently tested for Li capacity
had a steady specific capacity of 280 mAh g-1. The difference detected between the pure carbon and Sn/C
cases are consistent with Sn having the theoretical capacity of ~1000mAh g-1. The high stability of the
RES derived anodes, relative to earlier Sn based electrodes, is postulated to exist because RES synthesis
enables the formation of direct, strong bond between Sn and carbon substrate atoms, hence reducing the
rate of Sn electrode disintegration and capacity fade due to expansion upon lithiation. X-ray diffraction
and transmission electron microscopy are consistent with this postulate as both show an initial Sn
particles size of only a few nanometers and minimal growth after cycling. Reduced interface resistance is
also indicative of unique Sn-carbon bond.
Description
The article of record as published may be found at http://dx.doi.org/10.1016/j.carbon.2018.02.079
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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