(1. 天津大學(xué) 化工學(xué)院，天津 300072；
2. 中國電子科技集團(tuán)公司第十八研究所，化學(xué)與物理電源重點(diǎn)實(shí)驗(yàn)室，天津 300384；
3. 天津市津南區(qū)安全生產(chǎn)監(jiān)督管理局，天津 300350)
摘 要: 為了深入探索Li/CFx電池的高溫儲(chǔ)存性能及其容量衰減規(guī)律，本文分別研究不同儲(chǔ)存溫度和不同儲(chǔ)存時(shí)間對(duì)Li/CFx電池放電性能的影響，并分析了電池性能下降的機(jī)理。結(jié)果表明，Li/CFx電池的自放電行為會(huì)隨著儲(chǔ)存溫度的升高和儲(chǔ)存時(shí)間的延長(zhǎng)而變得越來越嚴(yán)重。EIS的分析結(jié)果表明，CFx陰極的電荷轉(zhuǎn)移電阻會(huì)隨著自放電的加劇而不斷地增大。SEM、XRD和拉曼光譜等分析測(cè)試結(jié)果表明，Li/CFx電池經(jīng)過高溫儲(chǔ)存后，CFx陰極表面上會(huì)形成一層自放電產(chǎn)物層，導(dǎo)致Li/CFx電池的放電容量和放電的電壓平臺(tái)逐漸地下降，電壓滯后效應(yīng)也愈發(fā)明顯。相對(duì)于儲(chǔ)存時(shí)間，Li/CFx的自放電行為對(duì)儲(chǔ)存溫度的升高更加敏感。
關(guān)鍵字: 鋰電池；氟化碳；高溫儲(chǔ)存；容量衰減；自放電
（1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. National Laboratory of Science and Technology on Power Sources, Tianjin Institute of Power Sources, Tianjin 300384, China;
3. Jinnan Administration of Work Safety, Tianjin 300350, China）
Abstract:In order to investigate the storage performances and failure mechanisms, the self-discharge behaviors of both the Li/CFx batteries stored at different temperatures and for different days were studied in detail. The discharge results show that the capacity of Li/CFx batteries fades rapidly with increasing the storage temperature or storage time. The testing results of EIS, SEM XRD and Raman spectroscopy indicate that a layer of self-discharge products may be produced on the surface of CFx cathode after storage at high temperature. The self-discharge products can decrease both the Rct and discharge voltage platform, and also promote the voltage hysteresis of Li/CFx cells obviously. Compared with the storage time, the self-discharge behavior of Li/CFx batteries is more sensitive to the increase of storage temperature.
Key words: Li-battery; carbon fluoride; storage at high temperature; loss of capacity; self-discharge
