PEDOT改性的正极材料NCA
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摘要
为了解决铝镍钴酸锂正极材料存在的循环性能不理想、高温循环容量产生气体等等问题,用导电高聚物(PEDOT)对锂离子电池正极材料铝镍钴酸锂表面进行了包覆处理。对处理后的正极材料进行了扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、原子吸收光谱法(AAS)和电化学性能测试。研究表明,经导电高聚物包覆处理,提高了NCA粒子的电子导电性,抑制了铝镍钴酸锂NCA正极材料与电解质中有机溶剂与正极材料间的反应。NCA的长期循环性能和高截止电压下的循环稳定性得到有效改善,高温产气问题得到克服。
In order to solve the problems of unsatisfactory cycle life and gas generation at high temperature existing in NCA, conducting polymer PEDOT was coated on the surface of NCA. The modified cathode material was characterized by SEM, XRD, AAS and its electrochemical performance was measured. The test results show that the modified cathode material increase the electron conduction of NCA particles and depress the reaction of the electrolyte with the cathode materials and the continued structure decline of NCA in long term cycling, overcome the gas generation during the charge/discharge process and improve the cycling and high current charging and discharging performance of the tested lithium-ion batteries.
In order to solve the problems of unsatisfactory cycle life and gas generation at high temperature existing in NCA, conducting polymer PEDOT was coated on the surface of NCA. The modified cathode material was characterized by SEM, XRD, AAS and its electrochemical performance was measured. The test results show that the modified cathode material increase the electron conduction of NCA particles and depress the reaction of the electrolyte with the cathode materials and the continued structure decline of NCA in long term cycling, overcome the gas generation during the charge/discharge process and improve the cycling and high current charging and discharging performance of the tested lithium-ion batteries.
引文
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[2] NONAKA T,OKUDA C,SENO Y,et al. In situ XAFS and microXAFS studies on LiNi0.8Co0.15Al0.05O2cathode material for lithium ionbatteries[J].Journal of Power Sources,2006,162:1329-1335.
[3] KONDO H,TAKEUCHI Y,SASAKI T,et al. Effects of Mg substi-tutionin Li(Ni,Co,Al)O2positiveelectrode materials on the crystalstructure and battery performance[J]. Journal of Power Sources,2007,174:1131-1136.
[4] SEINO Y,OTA T,TAKADA K.High rate capabilities of all-solid-state lithium secondary batteries using Li4Ti5O12-coated LiNi0.8Co0.15-Al0.05O2and a sulfide-based solid electrolyte[J]. Journal of PowerSources,2011,196:6488-6492.
[5] LEE D J,SCROSATI B,SUN Y K. Ni3(PO4)2-coated LiNi0.8Co0.15-Al0.05O2lithium battery electrode with improved cycling performanceat 55℃[J].Journal of Power Sources,2011,196:7742-7746.
[6] CHUNG Y,RYU S H,JU J H,et al. A surfactant-based method forcarbon coating of LiNi0.8Co0.15Al0.05O2cathode in Li ion batteries[J].Bulletin of Korean Chemical Society,2010,31(8):2304-2308.
[7]彭忠东.锂离子电池镍系正极材料的制备及室温固相表面包覆技术研究[D].长沙:中南大学,2008.
[8]赵方辉,应皆荣,何向明,等.LiNi0.8Co0.2O2表面包覆Mg O及其性能[J].电源技术,2003,27(1):14-16.
[9] SON J T,CAIMS E J.Characterization of LiCoO2coated Li1.05Ni0.35-Co0.25Mn0.4O2cathode material for lithium secondary cells[J]. Journalof Power Sources,2007,166:343-347.
[10] PARK S C,HAN Y S,KANG Y S,et al.Electrochemical propertiesof LiCoO2-coated LiMn2O4prepared by solution-based chemicalprocess[J].Journal of the Electrochemical Society,2001,148(7):A680-A686.