钠
材料科学
阴极
阳极
离子
聚偏氟乙烯
电极
法拉第效率
无机化学
化学
复合材料
聚合物
有机化学
冶金
物理化学
作者
Jae Hyeon Jo,Ji Ung Choi,Yun Ji Park,Jeong Keun Ko,Hitoshi Yashiro,Seung‐Taek Myung
标识
DOI:10.1016/j.ensm.2020.07.002
摘要
We demonstrate the potential of diethylenetriamine penta-acetic acid salt (DTPA-5Na) as a sacrificing sodium supply source for blending with sodium-deficient tunnel-type Na0.44MnO2. Herein, we report that DTPA-5Na shows presodiation effects on the sodium-deficient cathode. With the addition of DTPA-5Na to the Na0.44MnO2 (polyvinylidene-fluoride-less) electrode, the charge capacity increased from ~58 to ~128 mAh g−1. Thus, the DTPA-5Na provides additional capacity (~70 mAh g−1), originating from the five sodium ions in the DTPA-5Na structure during oxidative reaction. Furthermore, DTPA-5Na/Na0.44MnO2//0.5 M NaPF6 in a PC:FEC (98:2 v/v.%)//hard carbon full cell exhibits a high coulombic efficiency close to 100% with long-term cycling performance. Interestingly, the increase in discharge capacity is shown to be associated with the electro-conducting nature of the C3N deposits formed on the surface of Na0.44MnO2. Our findings indicate that the introduction of DTPA-5Na as a sacrificing additive in a cathode material may provide a new opportunity to apply sodium-deficient cathode materials in practical sodium-ion batteries.
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