Due to its high reliability and low cost, graphite has always been the most common commercial anode material for high-capacity lithium batteries. However, its limited lithium storage capacity (372mAh\/g) is increasingly unable to be considered as an energy source. Storage regulations. In the past ten years, We have studied a series of high-capacity anode materials to replace graphite, such as silicon and metallic lithium. Metal lithium is considered to be the best choice for rechargeable high-capacity lithium batteries because it has the smallest potential difference and the largest specific volume (3860mAh\/g). Holy Grail". Because metallic lithium The deposition process is not controllable. During the deposition process, the electrolyte will continue to be consumed, and it will continue to form a high impedance solid electrolyte film, and at the same time continue to form lithium dendrites, resulting in continuous deterioration of the photocatalytic properties and the generation of contrast. Serious safety hazard. Although adopted Many strategies have been used to control the deposition of metallic lithium, such as generating new electrolytes, electrolyte preservatives, three-dimensional structure of current collectors and polymer electrolyte solutions, etc. However, so far, this method has only remained in the laboratory. This link has not been applied in productization.

Here, academic researchers proposed a method of using graphite metal lithium mixed anode materials to control the photocatalytic deposition of metal lithium and prevent its contact with the electrolyte to improve the reliability of its circulation system. For the common two-dimensional graphite anode Materials, because the photoelectrocatalytic specificity of graphite end faces is higher than that of the base plane, therefore, the deposition of metallic lithium also generally produces end faces. Lithium is first nucleated on the end faces, and then continues to grow and develop into dendrites. The end faces of 2-dimensional graphite negative levels are similar to The electrolyte has a large contact area, and the continuously growing lithium dendrites are also exposed to the electrolyte, causing serious side effects and thus reducing the photocatalytic performance. Therefore, the academic research chose a unique structure. Synthetic graphite is used as the host material. This kind of graphite has a 3-dimensional structure, and the interior is composed of smaller 2-dimensional graphite. It also has large gaps. Moreover, the surface of this kind of graphite is mainly composed of base planes. Therefore, metallic lithium The deposition is preferentially produced inside the raw materials, thereby preventing direct contact with the electrolyte and reducing the occurrence of adverse reactions.