Electrolytes for improved performance of cells with high-capacity anodes based on micron-scale moderate volume-changing particles
摘要
說明書
As noted above, conventional anode materials utilized in Li-ion batteries are of an intercalation-type. Conventional cathode materials utilized in Li-ion batteries are also of an intercalation-type. Such cathodes may exhibit a highest charging potential of less than around 4.3 V vs. Li/Li+, gravimetric capacity less than 190 mAh/g (based on the mass of active material) and volumetric capacity of less than 1,000 mAh/cm3 (based on the volume of the electrode and not counting the volume occupied by the current collector foil). For conventional anodes, higher energy density in Li-ion batteries may be achieved either by using higher-voltage cathodes (e.g., cathodes with a highest charging potential from around 4.3 V vs. Li/Li+ to around 5.1 V vs. Li/Li+) or by using so-called conversion-type cathode materials. Combination of such types of higher energy density cathodes with high-capacity (e.g., Si based) anodes may result in high cell-level energy density. However, the cycle stability and other performance characteristics of such cells may not be suitable for certain applications, at least when used in combination with conventional electrolytes.
