Knowledge of electrode materials for lithium batteries

The development of lithium batteries relies on electrode materials that meet stringent requirements. The opening of high energy density lithium batteries relies on electrode data, which can meet increasingly stringent requirements, especially method data. The negative electrode is not only an important part of the working potential of a lithium battery, but also the available amount of lithium ions (that is, the quality of lithium ions). , Actual ability). Since the successful application of Lifepo4 to high-power lithium battery data, polyanionic composite materials have aroused widespread interest in the cathode research field in December. Although polyanionic compounds have disadvantages in terms of composition and volume (that is, the theoretical composition or volume capacity is smaller than that of laminar flow oxides), their inherent advantages are also obvious. They have a very stable structure and can provide long-term structural stability, which is essential for widespread circulation and handling safety issues. In addition, the chemical nature of the polyanion allows a given mn+/m(n-1)+ oxidation recovery rate to be monitored by the induction effect introduced by Goodenough, and the voltage value in the oxide is higher than Li+/Li0. After all, polyanionic compounds can have many atomic arrangements and crystal structures. It is very common to replace specific structure types with cations and anions. In the past two decades, different polyanionic compounds, such as asphaltene (PO43-), pyrophosphate (P2O74-), silicate (SiO44-), sulfate (SO42-), boric acid Salt (BO33-) and its fluoride have been extensively studied in the literature. This chapter analyzes and summarizes the research progress of polyanionic compounds for lithium batteries in recent years. Some discussion papers in this area can also be found in the literature. Here, we focus on different polyanionic compounds used as cathode data, except for olivine Lifepo4 and its analogs. Silicate is a component of a new type of polyanion electrode, which is less predictable, safer, and has a higher capacity than older compounds. The molecular formula of tetrahedral silicate is Li2MSiO4 (Mu003dFe, Mn, Co, Ni, V), which is an exciting research field and shows great programmability. These data not only show the high structural stability brought by the strong si-o covalent bond, but also environmental protection and low processing cost. It has a theoretical dual electronic communication function unit during the cycle, so the theoretical capacity is about 330mAh/g. Because of the use of these and other elements, orthosilicates have promoted the development of sig-ni-fi-can workshops since 2000. In 2006, the theoretical voltages of m2+/m3+ and m3+/m4+ in the redox process were predicted, and some theoretical voltages were tested. However, despite many studies in this field, the search for a reversible double electric reaction in Li2MSiO4 has so far achieved limited success. Li2MnsiO4 attracted the attention of researchers, who assumed that under medium pressure, both lithium ions in each formulation unit could be extracted. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium batteries have completely changed mobile electronic devices