Morphological evolution and kinetic enhancement of Li2FexMn1-xSiO4/C cathodes for Li-ion battery

Li_2MnSiO_4-based cathode materials possess reasonable work potentials and high theoretical capacities,while the practical energy/power densities are constrained by their inferior kinetics of Li~+ diffusion.In this work,the Pmn2_1-structure Li_2Fe_xMn_(1-x)SiO_4/C materials were synthesized via a solvothermal method and evaluated as Liion cathode materials,with notable morphological evolutions and tunable crystallographic habits observed after solvothermal process.The Li_2Fe_(0.33)Mn_(0.67)SiO_4/C material delivers an initial reversible capacity of 250.2mAh g~(-1)at 0.1 C(～1.51 Li~+insertion/extraction,1 C=166 mA g~(-1)),excellent high-rate capability(52.2 mAh g~(-1)at 5 C),and good long-term cyclability(64.6%after 196 cycles at 2 C).The enhanced electrochemical properties are attributed to the boosted ion/electron transports induced by preferred morphological and structural characteristics of Li_2Fe_(0.33)Mn_(0.67)SiO_4/C.     

硅酸聚合特性的研究

本文研究了硅酸在水溶液中的聚合特性,并用H-800电子显微镜对聚硅酸的胶粘进行了表征。日的在于探讨用无机化合物硅酸盐合成新的硅氧高聚物。     

聚合物/层状硅酸盐纳米复合材料制备方法及性能的研究进展

聚合物 /层状硅酸盐纳米复合材料因其优异的性能是目前材料科学研究的热点。本文介绍了层状硅酸盐的结构、聚合物 /层状硅酸盐纳米复合材料的类型及微观结构 ,重点介绍了聚合物 /层状硅酸盐纳米复合材料制备方法及性能的研究进展 ,指出需根据不同的聚合物 ,寻求经济可行的制备方法