(1. 浙江大學(xué) 材料科學(xué)與工程系, 杭州 310027;
2. 哈爾濱工程大學(xué) 化學(xué)工程系, 哈爾濱 150001)
摘 要: 應(yīng)用電化學(xué)交流阻抗法(EIS)研究了不同荷電狀態(tài)下的αNi(OH)2 的質(zhì)子擴(kuò)散系數(shù)(使用Equivcrt軟件擬合實(shí)驗(yàn)數(shù)據(jù))。結(jié)果表明, 質(zhì)子擴(kuò)散系數(shù)是電極荷電狀態(tài)的函數(shù), 在荷電狀態(tài)為20%左右時(shí),質(zhì)子擴(kuò)散系數(shù)具有最大值, 并且在荷電狀態(tài)大于10%時(shí), 均大于 β Ni(OH)2 活性物質(zhì)。 在電極荷電狀態(tài)為0%時(shí), 阻抗譜為半圓(在頻率小于10 Hz時(shí)), 未顯示固相有限擴(kuò)散控制的特征。 從理論上討論了此結(jié)果。
關(guān)鍵字: 電化學(xué);交流阻抗譜;電極;氫氧化鎳;電池
(1. Department of Materials Science and Engineering,Zhejiang University, Hangzhou 310027, P.R.China
2. Department of Chemistry, Harbin Engineering University,Harbin 150001, P.R.China)
Abstract:The electrochemical AC impedance spectrogram (EIS) was used for studying the proton diffusion coefficients (PDC) of α Ni (OH)2 with various charges. The results show that PDC is a function of chargeofstate. When the stateofcharge is about 20%, PDC has the biggest value, and at>10% of stateofcharge, the PDC for αNi (OH)2 is bigger than β Ni(OH)2. At 0% of stateofcharge a semicircle appears (<10 Hz), EIS does not display the solidphase limited diffusion characteristic. This result has beentheoretically discussed.
Key words: AC impedance spectrogram; electrode; Ni(OH)2; battery


