(1. 浙江大學(xué) 化學(xué)系，杭州 310027；2. 中國科學(xué)院 金屬研究所 腐蝕與防護(hù)國家重點(diǎn)實驗室，沈陽 110016)
摘 要: 以銅箔為基體，采用電沉積法制備錫電沉積層，并將其制成鋰離子電池用錫電極。采用掃描電子顯微鏡、X射線能量分散分析、X射線衍射、循環(huán)伏安和恒流充放電等對錫電極的物理性質(zhì)和電化學(xué)性能進(jìn)行表征。結(jié)果表明：調(diào)整電沉積時間可以有效地改變錫沉積層的表面形貌；電沉積5 min獲得的網(wǎng)狀多孔結(jié)構(gòu)的錫沉積層具有較大的不可逆容量和較好的電化學(xué)循環(huán)性能；電沉積較長時間制得的致密顆粒狀金屬錫電沉積層具有相對較大的可逆儲鋰容量，但其在電化學(xué)循環(huán)過程中會出現(xiàn)容量衰退現(xiàn)象；錫顆粒尺寸的降低有利于改進(jìn)顆粒狀金屬錫電沉積層的儲鋰性能；電沉積15 min制得的錫沉積層由粒徑較小的顆粒組成，經(jīng)30次充放電循環(huán)后其可逆儲鋰容量為400 mA∙h/g。
關(guān)鍵字: 錫電極材料；鋰離子電池；電沉積；形貌；容量
electrode material for lithium-ion battery
（1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
2. State Key Laborat, ory for Corrosion and Protection of Metal, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The electrodeposited tin coatings as electrode material for lithium-ion batteries were prepared by electroplating using copper foil as substrate, and their properties were investigated by scanning electron microscopy (SEM), X-ray energy dispersive analysis, X-ray diffractometry (XRD), cyclic voltammetry (CV) and galvanostatic charge-discharge tests. The results show that the morphologies of the tin coatings may be effectively changed by adjusting the electroplating time. The Sn coating with porous network structure obtained by electroplating for 5 min shows large irreversible capacity and good electrochemical-cycling stability. The dense granular tin coatings obtained by electroplating for longer time display larger reversible lithium storage capacity, but the capacity decay occurs during the electrochemical cycling. For the dense granular tin coatings, smaller tin grain size improves the lithium storage performance. The dense granular tin coating with smaller grain size obtained by electroplating for 15 min presents reversible capacity of 400 mA∙h/g after 30 cycles.
Key words: Sn electrode material; lithium ion batteries; electroplating; morphology; capacity
