期刊
NANO ENERGY
卷 34, 期 -, 页码 408-420出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2017.03.006
关键词
LiFePO4; Lithium-ion batteries; Phytic acid; Ultrahigh capacity; High energy efficiency
类别
资金
- National Natural Science Foundation of China [21506131, 21477084, 21606024]
A glucose-derived carbon-encapsulated (GC) LiFePO4 (LFP) with internal carbon sheets (IC) composite, GC/IC/ LFP, is synthesized by using phytic acid (PhyA) as a special phosphorus source. PhyA plays an important role as a structure-director, complexing agent and antioxidant, and the resulted IC contributes to improving electrochemical properties. The special morphology and microstructure of precursors and final materials are characterized and discussed in detail. The prepared GC/IC/LFP shows not only an excellent cycle performance, but an ultra-high specific capacity of 192 mA h g(-1) at 0.1 C, which exceeds the theoretical capacity of LFP. A remarkable rate performance of 140 mA h g(-1) at 10 C was also achieved. The energy efficiency of GC/IC/LFP can reach nearly 96% at 0.1 C.
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