期刊
ENERGY STORAGE MATERIALS
卷 21, 期 -, 页码 457-463出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.06.020
关键词
Li-ion battery; LiFePO4; Graphene; Hierarchical porous structures; All-climate
资金
- National Natural Science Foundation of China [51736006, 51471085, 51407029]
- China Postdoctoral Council [20140056]
- Aalto University
Tailor-designed cathode materials are essential for Li-ion batteries with both high energy density and outstanding capacity retention. Here we have designed and fabricated coral-shaped hierarchical porous LiFePO4/graphene hybrids for lithium-ion batteries. These novel hybrid materials exhibit excellent electrochemical performance over a wide temperature range from -40 degrees C to +60 degrees C. Even at -40 degrees C, the hybrid cathode can deliver a high initial capacity of 120 mAhg(-1) and still maintain a discharge capacity of 80 mAhg(-1) after 500 cycles with a very low capacity loss of 0.066% per cycle. The excellent wide-temperature performance can be ascribed to the porous structure and fast ion/electronic transport kinetics of the high conductive framework.
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