Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 27, Pages 17233-17238Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b03969
Keywords
Na2FeSiO4; nanocrystallites; zero-strain; cathode; sodium ion batteries
Funding
- National Basic Research Program of China (973 program) [2011CB935903]
- National Natural Science Foundation of China [21233004, 21473148, 21021002, 21428303]
- Natural Science Foundation of Fujian Province of China [2015J01030]
- U.S. Department of Energy, Basic Energy Sciences, Division of Materials Science and Engineering [DE-AC02-07CH11358]
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A new cubic polymorph of sodium iron silicate, Na2FeSiO4, is reported for the first time as a cathode material for Na-ion batteries. It adopts an unprecedented cubic rigid tetrahedral open framework structure, i.e., F (4) over bar 3m, leading to a polyanion cathode material without apparent cell volume change during the charge/discharge processes. This cathode shows a reversible capacity of 106 mAh g(-1) and a capacity retention of 96% at 5 mA g(-1) after 20 cycles.
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