(1. 安徽建筑大學(xué) 環(huán)境與能源工程學(xué)院，合肥 230601；
2. 同濟(jì)大學(xué) 環(huán)境科學(xué)與工程學(xué)院 污染控制與資源化研究國家重點(diǎn)實(shí)驗(yàn)室，上海 200092；
3. 上海第二工業(yè)大學(xué) 上海電子廢棄物資源化產(chǎn)學(xué)研合作開發(fā)中心，上海 201209)
摘 要: 為了恢復(fù)鋰離子電池中正極鈷酸鋰材料的電化學(xué)活性，對置于LiOH溶液中的失效鈷酸鋰進(jìn)行超聲再生研究。采用XRD和Raman光譜分析鈷酸鋰晶體結(jié)構(gòu)，采用SEM分析鈷酸鋰表面形貌和顆粒大小，采用FT-IR光譜儀和TGA熱分析儀分析鈷酸鋰表面粘附的有機(jī)物。結(jié)果表明：超聲空化效應(yīng)可以有效地去除鈷酸鋰表面的有機(jī)物，并有利于鈷酸鋰晶體在LiOH溶液中Co和Li陽離子的重排。室溫條件下，失效的鈷酸鋰在2.0 mol/L LiOH溶液中經(jīng)過12 h超聲處理后，成功恢復(fù)了其電化學(xué)活性。鋰離子電池的首次充電容量為132.2 mA？h/g，首次放電容量為131.9 mA？h/g，第50次循環(huán)時(shí)的電容保持率為97.2%。
關(guān)鍵字: 廢鋰離子電池；鈷酸鋰；超聲輻射；再生
（1. School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering,
Tongji University, Shanghai 200092, China;
3. Shanghai Cooperative Centre for Waste Electric and Electronic Equipment Recycling,
Shanghai Second Polytechnic University, Shanghai 201209, China）
Abstract:The spent LiCoO2 was treated in LiOH solution exerted by ultrasound with the aim to renovate its electrochemical characteristics. The crystal structures of LiCoO2 were characterized by XRD and Raman spectroscopy, respectively. The morphology and particle sizes of LiCoO2 were analyzed by SEM. The organic substance adhered to the used LiCoO2 particle surfaces was determined by using Fourier transform infrared spectrometer (FT-IR) and thermogravimetric analysis (TGA), respectively. The results show that ultrasonic cavitation can be effectively used to remove organic substance stuck on LiCoO2 surface and facilitate the cation rearrangement of Co+ and Li+ in LiOH. At room temperature, the spent LiCoO2 is successfully renovated in 2.0 mol/L LiOH solution treated by ultrasound for 12 h. The charge capacity in the first cycle is 132.2 mA？h/g, the discharge capacity is 131.9 mA？h/g, and 97.2% of the discharge capacity is retained after 50 cycles.
Key words: spent lithium-ion battery; LiCoO2; ultrasonic irradiation; regeneration
