A High-Performance Dual-Ion Battery Enabled by Conversion-Type Manganese Silicate Anodes with Enhanced Ion Accessibility

Limited by the sluggish kinetics of conversion-type anodes from huge diffusion-controlled phase transformation and unsatisfactory capacities of intercalation/alloy-type anodes, the performances of lithium-based dual ion batteries (LDIBs) remain to be promoted. Herein, for the first time, ultra-small manganese silicate (MS) nanosheets anchored on reduced graphene oxides (MSR) with enhanced diffusion kinetics are constructed, realizing the construction of high performance LDIBs on the basis of conversion-type anodes. The ion diffusion rate of MSR is promoted by in situ coating Li4SiO4 ionic conductor on the electrode surface during lithiation process. Simultaneously, the ion diffusion pathways are shortened by partially converting the diffusion-controlled bulk reaction to surface reaction with massive pseudocapacitive contribution. Consequently, the MSRbased LDIB exhibits superior electrochemical performances with discharge capacities of 191 mAhg(-1 )at 0.5 C and 128 mAhg(-1) at 2 C after 150 cycles, exceeding to those of reported LDIBs and benefiting the future electrode design of LDIBs.