提出一种双有机溶剂,碳酸丙烯酯(PC)和N,N-二甲基甲酰胺(DMF)杂化的水系电解液新体系,用于水系锌金属电池。实验结果表明,5%DMF+2%PC杂化2 M ZnSO_(4)水系电解液,不但明显减低了锌负极的析氢,而且促进锌的三维沉积,抑制了锌负极枝晶,同...提出一种双有机溶剂,碳酸丙烯酯(PC)和N,N-二甲基甲酰胺(DMF)杂化的水系电解液新体系,用于水系锌金属电池。实验结果表明,5%DMF+2%PC杂化2 M ZnSO_(4)水系电解液,不但明显减低了锌负极的析氢,而且促进锌的三维沉积,抑制了锌负极枝晶,同时双有机溶剂可以降低水系电解液的凝固点到-20℃。基于合成的新电解液体系,在1 m A/cm^(2)的电流密度下,Zn||Zn对称电池能够稳定循环500 h以上,Zn||Cu非对称电池能够稳定循环1000圈以上,平均库伦效率为99.06%。并且Zn||MnO_(2)全电池在1 A/g的大电流密度下,循环2000圈后,仍保持着210 mAh/g的高比容量。展开更多
The macrocyclic ligand(L) and its dinuclear copper(Ⅱ) and zinc(Ⅱ) complexes have been synthesized. The crystal structure of [Cu 2L(Him) 2](ClO 4) 4·2H 2O has been determined by single crystal X ray diffraction....The macrocyclic ligand(L) and its dinuclear copper(Ⅱ) and zinc(Ⅱ) complexes have been synthesized. The crystal structure of [Cu 2L(Him) 2](ClO 4) 4·2H 2O has been determined by single crystal X ray diffraction. It crystallizes in a monoclinic system, the space group P2 1/c , a =0.951 2(2) nm, b =2.010 4(4) nm, c =1.202 5(2) nm, β =98.89(3)°, V =2.271 9(8) nm 3, Z=2, D c=1.599 Mg/m 3 , F (000) = 876 , R =0.059 1, wR =0.173 3, GOF(F)=1.009. The copper(Ⅱ) atom is five coordinated with four nitrogen atoms of the macrocyclic ligand and one nitrogen atom of imidazole. The stepwise stability constants of the 1∶1 and 2∶1 molar ratios of Cu to L and Zn to L complexes were determined by potentiometric titration in KCl supporting electrolyte(0.100 mol/L) at 25 ℃. The results indicated that zinc(Ⅱ) ion can form hydroxide bridged dinuclear complex [Zn 2(OH)L] 3+ , while the copper(Ⅱ) ion can only form dinuclear complex 3+ with macrocyclic ligand.展开更多
文摘提出一种双有机溶剂,碳酸丙烯酯(PC)和N,N-二甲基甲酰胺(DMF)杂化的水系电解液新体系,用于水系锌金属电池。实验结果表明,5%DMF+2%PC杂化2 M ZnSO_(4)水系电解液,不但明显减低了锌负极的析氢,而且促进锌的三维沉积,抑制了锌负极枝晶,同时双有机溶剂可以降低水系电解液的凝固点到-20℃。基于合成的新电解液体系,在1 m A/cm^(2)的电流密度下,Zn||Zn对称电池能够稳定循环500 h以上,Zn||Cu非对称电池能够稳定循环1000圈以上,平均库伦效率为99.06%。并且Zn||MnO_(2)全电池在1 A/g的大电流密度下,循环2000圈后,仍保持着210 mAh/g的高比容量。
文摘The macrocyclic ligand(L) and its dinuclear copper(Ⅱ) and zinc(Ⅱ) complexes have been synthesized. The crystal structure of [Cu 2L(Him) 2](ClO 4) 4·2H 2O has been determined by single crystal X ray diffraction. It crystallizes in a monoclinic system, the space group P2 1/c , a =0.951 2(2) nm, b =2.010 4(4) nm, c =1.202 5(2) nm, β =98.89(3)°, V =2.271 9(8) nm 3, Z=2, D c=1.599 Mg/m 3 , F (000) = 876 , R =0.059 1, wR =0.173 3, GOF(F)=1.009. The copper(Ⅱ) atom is five coordinated with four nitrogen atoms of the macrocyclic ligand and one nitrogen atom of imidazole. The stepwise stability constants of the 1∶1 and 2∶1 molar ratios of Cu to L and Zn to L complexes were determined by potentiometric titration in KCl supporting electrolyte(0.100 mol/L) at 25 ℃. The results indicated that zinc(Ⅱ) ion can form hydroxide bridged dinuclear complex [Zn 2(OH)L] 3+ , while the copper(Ⅱ) ion can only form dinuclear complex 3+ with macrocyclic ligand.