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In Situ-Formed Cr2O3 Coating on NaCrO2 with Improved Sodium Storage Performance.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acsami.0c11320 Shuo Wang 1 , Fei Chen 1 , Tian-Yuan Zhu 1 , Xiao-Dong He 1 , Jia-Ying Liao 1 , Li-Ming Zhang 1 , Xiang Ding 1 , Qiao Hu 1 , Chun-Hua Chen 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-10 , DOI: 10.1021/acsami.0c11320 Shuo Wang 1 , Fei Chen 1 , Tian-Yuan Zhu 1 , Xiao-Dong He 1 , Jia-Ying Liao 1 , Li-Ming Zhang 1 , Xiang Ding 1 , Qiao Hu 1 , Chun-Hua Chen 1
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Cr2O3 is generally considered as an impurity phase with negative effects on the electrochemical performance of NaCrO2 because it may cause a certain degree of capacity loss. In this study, however, we have found the bright side of Cr2O3 as a protective coating material, which greatly improves the Na+ storage capability, especially the cycling stability, of NaCrO2. After 1000 cycles at 10C, a capacity of 100.4 mAh g–1 with a high capacity retention of 84.8% can be achieved for a Cr2O3-coated NaCrO2 sample. The optimal sample exhibits a rate performance with 108.0 mAh g–1 at a high rate of 60C. Cyclic voltammetry analysis indicates that such an in situ-formed inactive Cr2O3 layer has little influence on Na+ diffusion in NaCrO2 electrodes, but it prevents the direct contact between the active material and the electrolyte, suppressing the side reactions effectively.
中文翻译:
在NaCrO2上原位形成的Cr2O3涂层具有改善的钠储存性能。
Cr 2 O 3通常被视为对NaCrO 2的电化学性能具有负面影响的杂质相,因为它可能导致一定程度的容量损失。但是,在这项研究中,我们发现Cr 2 O 3的光亮面作为保护性涂层材料,可以大大提高NaCrO 2的Na +储存能力,尤其是循环稳定性。在10C下进行1000次循环后,对于涂有Cr 2 O 3的NaCrO 2而言,可以实现100.4 mAh g –1的容量,并具有84.8%的高容量保持率样品。最佳样品在60C的高速率下具有108.0 mAh g –1的速率性能。循环伏安法分析表明,这种原位形成的惰性Cr 2 O 3层对NaCrO 2电极中的Na +扩散影响很小,但可以防止活性物质与电解质直接接触,从而有效地抑制了副反应。
更新日期:2020-10-07
中文翻译:
在NaCrO2上原位形成的Cr2O3涂层具有改善的钠储存性能。
Cr 2 O 3通常被视为对NaCrO 2的电化学性能具有负面影响的杂质相,因为它可能导致一定程度的容量损失。但是,在这项研究中,我们发现Cr 2 O 3的光亮面作为保护性涂层材料,可以大大提高NaCrO 2的Na +储存能力,尤其是循环稳定性。在10C下进行1000次循环后,对于涂有Cr 2 O 3的NaCrO 2而言,可以实现100.4 mAh g –1的容量,并具有84.8%的高容量保持率样品。最佳样品在60C的高速率下具有108.0 mAh g –1的速率性能。循环伏安法分析表明,这种原位形成的惰性Cr 2 O 3层对NaCrO 2电极中的Na +扩散影响很小,但可以防止活性物质与电解质直接接触,从而有效地抑制了副反应。