- 著者
- Liu Xizheng Li Huiqiao Li De Ishida Masayoshi Zhou Haoshen
- 出版者
- Elsevier B.V.
- 雑誌
- Journal of power sources (ISSN:03787753)
- 巻号頁・発行日
- vol.243, pp.374-380, 2013-12
- 被引用文献数
- 84
Layered LiNi1/3Co1/3Mn1/3O2 was modified by poly(3,4-dioxyethylenethiophene) PEDOT via a facile method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared spectroscopy (IR). PEDOT modified samples exhibited both improved rate and cycle performance compared with the pristine LiNi1/3Co1/3Mn1/3O2. At a charge/discharge current of 1500 mA g−1, the discharge capacity was improved from 44.3 to 73.9 mAh g−1. The sample with 2 wt% and heat treated at 300 °C showed the optimized electrochemical performance. Galvanostatic intermittent titration technique (GITT) and cyclic voltammetry (CV) results indicated that the battery polarization of coated samples have been suppressed obviously because the PEDOT layer facilitated the electron transfer at the interface of electrode and electrolyte.
- 著者
- Kubota Tadahiko Ihara Masayuki Katayama Shinichi Nakai Hideki Ichikawa Junji
- 出版者
- Elsevier B.V.
- 雑誌
- Journal of power sources (ISSN:03787753)
- 巻号頁・発行日
- vol.207, pp.141-149, 2012-06
- 被引用文献数
- 20
Five 1,1-difluoro-1-alkenes bearing aryl groups are investigated as electrolyteadditives for high-charge-voltage lithiumionbatteries with an aim to induce favorable solid electrolyte interphase (SEI) formation. Among them, 1,1-difluoro-4-phenylbut-1-ene (DF-1) forms appropriate SEIs on the cathode and anode by its reactions under oxidative and reductive conditions, respectively, which was suggested by linear sweep and cyclic voltammetry. The SEIs formed with the DF-1 containing electrolyte on the cathode and anode were analyzed by X-ray photoelectron spectroscopy and time of flight-secondary ion mass spectrometry, indicating the following: (i) the cathode surface has a LiF-rich layer with unsaturated hydrocarbons, and (ii) the anode surface also has a LiF-rich layer, which probably includes fluoromethylene (CHF) compounds. The formation of the SEIs on both electrodes with DF-1 results in low impedance being maintained, and thus, particularly good cycle performance even at high-charge-voltage.