In the manufacturing process of lithium batteries, the A/B misalignment problem, which is often overlooked in the coating process, actually has a significant impact on the capacity performance, safety performance, and cycle life of the battery. The so-called misalignment mainly refers to the inconsistent position or uneven thickness distribution of the coating on both sides of the pole piece, which can easily lead to potential risks such as local lithium deposition and mechanical damage to the pole piece....

Constructing a carbon based carrier with high porosity for accommodating silicon nanoparticles and buffering volume expansion; Raw material selection: Select biomass carbon, polymer carbon, or commercial hard carbon, with a porosity of>60% and uniform pore size distribution (mainly micropores mesopores).Process steps: Carbonization in an inert atmosphere (Ar/N ₂) at high temperature (800-1200 ℃) to form a porous structure; Activation through KOH or CO ₂ further enlarges the pores, increasing the specific surface area (>1000 m ²/g). Equipment continuous atmosphere rotary furnace (such as Longxin drying equipment), supporting inert gas protection and precise temperature control....

Root cause of the problem: During lithiation (charging) of silicon, each silicon atom can combine with up to 3.75 lithium ions (forming Li ₁₅ Si ₄), resulting in a volume expansion of approximately 300-400%. During lithium removal (discharge), it will shrink again. This repeated expansion contraction will generate mechanical stress.