Download or read book Nano-engineered Electrode Materials for Advanced Lithium-ion Batteries written by Yun Xu and published by . This book was released on 2014 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium ion batteries are currently the energy source of choice for small mobile devise like cell phones, laptops, owning to their balance of energy density with power density compared to other energy storage devices, like nickel cadmium batteries. At present there is great urgent need to replace gasoline with environmental healthy electricity. Li-ion batteries became a great alternative as an energy carrier for electric and hybrid electric vehicles. The ever increased power density and the life time of the battery are highly desirable in the application. So there is a great space for the improvement of lithium ion batteries. Thus the focus of the study is put on increasing the power density and cycle life of batteries. Performance of batteries could be improved by means of synthesizing composites, reduce interface resistance, building two dimensional and three dimensional architecture, etc. High performance anode materials such as two dimensional MoO2/graphite oxide composite, three dimensional anode material Co3O4 on nickel foam as well were successfully developed and showed excellent performance. The composites show better performance than each component due to the synergistic effects between the components. By taking advantage of the two-dimensional and three-dimensional structure, the electrodes exhibited stable output and high power density, as been discussed in chapter 4 and chapter 5. Meanwhile, cathode materials with high stability and high rate capability were synthesized, such as LiMn2O4, V2O5. By doping cations into cathodes, conductivity and structural stability could be improved. Also the electronic structure could also been changed due to the introduction of the cations with different valance. The cathodes were proved to be both stable and fast response to current, as been discussed in chapter 6 and chapter 7. Another way of increase power density is to increase the potential of battery. This is achieved by increase the potential of cathode amterials. Also by modify the surface the high potential electrode, we successfully alleiviate the problem of surface consumption of electrolyte. Nickel doped LiMn2O4 (LiMn1.6Ni0.4O4) is shown to have both high power density and stability. By having higher concentration of Mn3+ ions at surface, we have solve the problem of surface oxidation of electrolyte. Also taking advantage of carbon coating, the dissolution of Mn2+ into electrolyte is also prohibited while the electronic conductivity is increase, as been discussed in chapter 8.1. A new concept of bat-capacitor was brought out too by taking advantage of fast charge nd discharge of capacitor. By combining battery and capacitor, capacitor can serve as lithium ions buffer and reservoir before they can diffuse into battery. Just by simply annealing amorphous materials and forming a partially crystallized electrode, which can be treated as complicated system of nanobatteries and nanocapacitors, as been discussed in chapter 9.