High-performance SiOx anode based on a pre-lithiation sodium alginate binder

The development of new high-performance binders is an effective strategy for lithium-ion batteries to cope with the volume expansion of SiO x anodes during cycling. In this study, a strategy is adopted for utilizing pre-lithiated sodium alginate (SA-LiCl 40 ) as a high-performance SiO x anode binder. The addition of LiCl not only enables the linear SA binder to link into a three-dimensional network structure but also enriches a large number of lithium carboxylate groups, improving the Li + transport rate within the anode. As a result, the mechanical properties of the binder increase, and interfacial adhesion between the copper current collector and the SiO x anode stabilizes, efficiently inhibiting volume expansion while enhancing cycling stability and initial Coulombic efficiency (ICE). When SA-LiCl 40 serves as the binder for the SiO x anode, the ICE significantly improves by 13.5 %. A discharge capacity of 918.2 mA h g −1 is obtained after 100 cycles, and a high reversible capacity of 791.9 mA h g −1 is achieved after 300 cycles at 1 A g −1 . Therefore, this work provides novel insights into developing new binders for high-performance SiO x anodes in lithium-ion batteries.