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Enhanced EV market penetration requires durability of the battery with highenergy throughput. For long-term cycle stability of silicon-graphite anodecapable of high energy density, the reversible redox reactions are crucial.Here, we unveil intriguing electrochemical phenomena such as crosstalk oflithium ion ($Li^{+}$) between silicon and graphite, $Li^{+}$ accumulation insilicon, and capacity depression of graphite under high pressure, whichengender the irreversible redox reactions. Active material properties, i.e. thesize of silicon and the hardness of graphite, silicon-graphite anode, aremodified based on the unveiled results to enhance the reaction homogeneity andreduce subsequent degradation. Owing to the property change of the anode activematerials, silicon-graphite anode paired with high nickel cathode allows theprismatic cell with 8.7 Ah to reach cycling performance over 750 cycles withvolumetric energy density of 665 $Whl^{-1}$, which is corresponding to 800$Whl^{-1}$ in the prismatic cell with 87 Ah. Finally, the cycling performancecan be tailored by the design of electrode regulating $Li^{+}$ crosstalk. Ourfindings provide electrochemical insights into degradation mechanisms and apromising direction on the progressive improvement of materials and the designof electrodes in silicon-graphite anode.

Interplay of Inhomogeneous Electrochemical Reactions with Mechanical Responses in Silicon-Graphite Anode and its Impacts on Degradation