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Comparative Investigation of Na2FeP2O7 Sodium Insertion Material Synthesized by Using Different Sodium Sources
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acssuschemeng.7b04516
Jun-chao Zheng 1 , Bi-yuan Yang 1 , Xiao-wei Wang 1 , Bao Zhang 1 , Hui Tong 1 , Wan-jing Yu 1 , Jia-feng Zhang 1
Affiliation  

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 °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.

中文翻译:

不同钠源合成Na 2 FeP 2 O 7钠插入材料的比较研究

通过使用不同的钠源(Na 2 CO 3,NaH 2 PO 4和NaOH)通过固相法合成Na 2 FeP 2 O 7粉末,以及它们的固相反应机理和电化学性质详细研究了2 FeP 2 O 7。结果表明,NaH 2 PO 4有利于具有较宽间距的晶体表面的生长,这有助于钠离子的嵌入和脱嵌。钠22 O 7使用NaH 2 PO 4在600°C下合成的化合物表现出最佳的电化学性能,在C / 10的循环速率下,其初始放电容量为82.8、79.4、77.9、75.3、68.8和47.8 mAh g –1, C / 5,C / 2、1C,2C和5C。此外,在不同的循环速率下,在C / 10时可逆容量为81.0 mAh g –1,约为理论容量的83.5%。在C / 2下140次循环后,容量保持率约为93.3%。结果表明,选择合适的钠源以合成具有良好性能的Na 2 FeP 2 O 7非常重要。
更新日期:2018-03-12
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