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Sodium tert-butoxide as stable electrode material in aprotic electrolyte for high cycle stability organic sodium-ion batteries

Tao Huang,Rongrong Zheng,Haiyang Chang,Di Ma,Haijun Niu

Organic electrode material can be obtained from biomass through green process, so it is a sustainable green electrode material. However, the capacity attenuation problem of organic electrode seriously affects its application in the field of batteries . Desodiation state and sodiation state are the two corresponding states of electrode materials in redox reaction . The reason for this problem is that the reported desodiation state or sodiation state of organic electrode active unit cannot exist stably in aprotic electrolyte. Here, we report a new organic active unit sodium tert-butoxide (STB), which can exist stably in aprotic electrolyte to obtain high cycle stability. As the electrode of rechargeable batteries, the STB exhibits a capacity of 206 mAhg −1 at 35 mAg −1 , 2.4 V. The battery runs more than 5000 cycles at 210 mAg −1 , 135 mAhg −1 , no capacity attenuation. The other two battery samples run more than 6500 cycles and 10000 cycles at 600 mAg −1 , with the capacity retention 99% and 98%, respectively. STB provides a design basis for the development of organic electrode materials with high energy density and high cycle stability.