What are the pre-lithiation technologies for lithium batteries

Common pre-lithiation methods are negative electrode lithium supplementation, such as lithium foil supplementation, lithium powder supplementation, etc., which are currently the key development pre-lithiation processes; in addition, there are also lithium silicide powder and electrolytic lithium salt aqueous solution for pre-lithiation. Lithization technology. 1. Lithium foil replenishment Lithium foil replenishment is a technology that uses self-discharge mechanism to replenish lithium. The potential of metallic lithium is the lowest among all electrode materials. Due to the existence of the potential difference, when the negative electrode material contacts the metallic lithium foil, electrons spontaneously move to the negative electrode, accompanied by the intercalation of Li+ in the negative electrode. 2. Compared with the addition of stabilized lithium metal powder (SLMP) in the slurrying process, it is easier and easier to load SLMP directly on the surface of the dry negative electrode. Use SLMP to pre-lithiate the silicon-carbon nanotube negative electrode. Drop a 3% SLMP/toluene solution on the surface of the silicon-carbon nanotube negative electrode. After the toluene solvent evaporates, press, activate, and pre-lithiate After that, the first irreversible capacity of the negative electrode was reduced by 20% to 40%. 3. Lithium silicide powder Nano-lithium silicide powder has a small size, which is more conducive to dispersion in the negative electrode; in addition, it is already in an expanded state, and the volume change during the cycle will not affect the structure of the entire electrode. 4. Electrolytic lithium salt aqueous solution for lithium replenishment. Lithium replenishment for silicon is carried out by electrolyzing Li2SO4 aqueous solution in an electrolytic cell. The sacrificial electrode is copper wire immersed in Li2SO4. It does not matter whether lithium foil, SLMP or lithium silicide powder is used to replenish lithium. It involves the use of metallic lithium. Lithium metal is expensive, highly active, difficult to operate, and expensive to store and transport for protection. With the in-depth research of lithium battery materials, the improvement of manufacturing level and the improvement of the market's requirements for battery performance, it has been very limited to improve the performance of lithium batteries through the traditional idea of u200bu200breplacing electrode materials and developing new electrolytes. The emergence of prelithiation technology has improved the performance of lithium batteries, especially in terms of improving irreversible capacity loss and increasing energy density. It has given an effective treatment method, and has injected new vitality into the development of lithium battery technology. 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: Electric vehicle lithium iron phosphate battery pack repair and activation method analysis