【摘 要】
：
In order to obtain a new precursor for LiFePO4, Fe2P2O7 with high purity was prepared through solid phase reaction at 650 ℃ using starting materials of FeC2O4
【机 构】
：
School of Metallurgical Science and Engineering
论文部分内容阅读
In order to obtain a new precursor for LiFePO4, Fe2P2O7 with high purity was prepared through solid phase reaction at 650 ℃ using starting materials of FeC2O4 and NH4H2PO4 in an argon atmosphere. Using the as-prepared Fe2P2O7, Li2CO3 and glucose as raw materials, pure LiFePO4 and LiFePO4/C composite materials were respectively synthesized by solid state reaction at 700 ℃ in an argon atmosphere. X-ray diffractometry and scanning electron microscopy(SEM) were employed to characterize the as-prepared Fe2P2O7, LiFePO4 and LiFePO4/C. The as-prepared Fe2P2O7 crystallizes in the c1 space group and belongs to β-Fe2P2O7 for crystal phase. The particle size distribution of Fe2P2O7 observed by SEM is 0.4-3.0μm. During the Li+ ion chemical intercalation, radical P2O4-O7 is disrupted into two PO3-4 ions in the presence of O2-, thus providing a feasible technique to dispose this poor dissolvable pyrophosphate. LiFePO4/C composite exhibits initial charge and discharge capacities of 154 and 132 mA·h/g, respectively.
其他文献
Considering the instability of data transferred existing in high speed network.a near method is proposed for improving the stability using control theory.Under
Equal channel angular pressing (ECAP) is an effective thermo-mechanical process to make ultrafine grains.An investigation was carried out on the friction stir w
A practical catalytic method to oxidize α-ionone with molecular oxygen using N-hydroxyphthalimide(NHPI) combined with acetylaeetone cobatt(Ⅱ) (Co(acac)2) was
In the light of the localized progressive damage model, the evolution law of cohesive and frictional strength with irreversible strains was determined. Then, th
Fe-Cr-Mo-Ni-C-Co alloy was quenched in liquid nitrogen and held for 24 h. Hardness tester, OM, XRD, SEM were used to investigate the mechanical properties and m
The multivalued general mixed implicit equilibrium-like problems are introduced and studied.To solve these problems,a new predictor-corrector iterative algorith
Based on the problem that the service entity only has the partial field of vision in the network environment, a trust evolvement method of the macro self-organi
Two thermomechanical coupled elastic-plastic finite element (FE) models were developed for predicting the 12-pass continuous rolling process of GCr15 rod and wi
The electrochemical behaviors of n-type silicon wafers in silica-based slurry were investigated, and the influences of the pH value and solid content of the slu
The cathode materials LiMn204 and rare earth elements La-doped or La and F dual-doped spinel lithium manganese oxides were synthesized by the citric acid-assist