The present invention relates to the technical field of batteries, and in particular to a cylindrical battery, including: a housing (1), provided with an opening and an accommodating cavity for accommodating a cell; a first current collector, arranged in t...

Disclosed is a preparation method for modified polypropylene, comprising the following steps: dissolving polypropylene in a solvent; and adding a Lewis acid and an initiator into the solution in which the polypropylene is dissolved, and then performing a g...

Disclosed are an electrolyte additive and a preparation method therefor, an electrolyte and a lithium ion battery. The preparation method for an electrolyte additive comprises: dissolving a picric acid in an organic solvent to obtain an additive solution, ...

Disclosed is a porous silicon negative electrode material, comprising a sparse-silicon inner core, and a transition ring, a dense-silicon ring and a carbon coating layer which are sequentially coated on the surface of the sparse-silicon inner core. In the ...

Disclosed are an explosion-proof valve, a battery top cover and a lithium battery. The explosion-proof valve specifically includes an explosion-proof valve cover (10) and an explosion-proof valve seat (30), the explosion-proof valve seat (30) being provide...