http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
One-pot preparation of LiFePO4/C composites
Juan Wang,Ji-Yu Li,Zhong-Bao Shao,Hong-Tao Fan,Hong-Qiang Ru,Shu-Yan Zang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.2
A convenient one-pot method, called high-temperature high-energy mechanical force (HTHEMF), was successfully developed for the preparation of LiFePO4/C composites. Upon the combination of high-temperature with high-energy mechanical force, the whole synthesis process of this method is very simple and only involves two steps, the precursor preparation and the calcination step. The results of XRD, SEM, BET and electrochemical performance tests indicated that after calcination at 600 oC for 9 h, the LiFePO4/C composites have the best properties. The discharge capacity of the composites was 150.3mA h g−1 at 0.1 C. After 30 cycles test, the reversible capacity was 147mA h g−1 and the retention ratio to the initial capacity was 97.8%. The results indicated that LiFePO4/C composites with good properties can be obtained by one-pot HTHEMF method.
Xiaopeng Huang,Feng Liang,Yuanchao Du,Keyu Zhang,Yaochun Yao,Yongnian Dai 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11
A systematic approach was used to develop the empirical model for optimizing the preparation process parameters for the synthesis of LiFe1-x-yMgxTiyPO4/C composite cathode material. For optimizing the production parameters, response surface methodology (RSM) was applied to develop a linear regression model and maximize the discharge capacity. Analysis of the variance (ANOVA) showed that the three variables (Mg-dopant, Ti-dopant and sintering temperature) and the interactions among them were significant factors. Response surfaces formed by RSM illustrated that the doping of Mg and Ti on Fe site had obviously synergistic effect on the discharge capacity. In the process optimization, the parameters were 2.9% of Mg-dopant, 3.0% of Ti-dopant and sintering temperature of 678.5℃, corresponding to a discharge capacity of 136.7 mAh/g predicted by the model. This predicted value was in good agreement with the actual value (136.4 mAh/g) by confirmatory experiment. The optimized LiFe0.941Mg0.029Ti0.030PO4/C composite exhibits a good rate performance and cycling stability due to the enhancement of electronic conductivity and lithium diffusion coefficient (3.1 X 10-12 cm2 /s) by the co-doping of Mg and Ti ions.