Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 4, Pages 4966-4972Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b04516
Keywords
Preferred orientation; Sodium-ion batteries; Sodium iron pyrophosphate; Cathode materials; Different sodium sources; Synthesis mechanism
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Funding
- National Natural Science Foundation of China [51572300]
- Innovation-Driven Project of Central South University [2016CX021]
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Na2FeP2O7 powders were synthesized by a solid-state method by using different sodium sources (Na2CO3, NaH2PO4, and NaOH), and their solid-state reaction mechanism and the electrochemical properties of the synthesized Na2FeP2O7 were studied in detail. The results indicate that NaH2PO4 is conducive to the growth of the crystal surface with a wider spacing, which contributes to sodium-ion intercalation and deintercalation. Na2FeP2O7 synthesized at 600 degrees C by using NaH2PO4 exhibits the best electrochemical performance among them, showing an initial discharge capacity of 82.8, 79.4, 77.9, 75.3, 68.8, and 47.8 mAh g(-1) under the cycle rate of C/10, C/5, C/2, 1C, 2C, and 5C, respectively. Moreover, a reversible capacity of 81.0 mAh g(-1) at C/10, about 83.5% of the theoretical capacity, can be achieved after different cycle rates. The capacity retention is about 93.3% after 140 cycles under C/2. The results indicate that it is very important to choose the right sodium sources to synthesize Na2FeP2O7 with a good performance.
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