AFM: Silane cross-linked MXene skeleton realizes 3000h stable cycle of lithium anode under super high current density and capacity

Research Background

In order to meet the requirements of practical energy storage applications, secondary batteries with high energy/power density and long charge-discharge life must be developed. Due to its extremely high theoretical specific capacity (3860 mAh G-1) and low REDOX potential (− 3.04V vs. Standard hydrogen electrodes, therefore, are considered ideal for lithium anode materials. However, from the point of view of actual battery application, the lithium anode of metal needs to be greatly improved in terms of multiplier, specific capacity and stability of charge and discharge. On the one hand, the surface capacity of lithium cathode is required to be greater than 10 mAh Cm-2, in order to achieve the energy density of the battery to reach 500 Wh kg-1; On the other hand, the application of next-generation batteries requires lithium cathode to achieve rapid charging and discharging at a current density greater than 10 mA Cm-2. However, uncontrollable dendrite growth, electrode volume expansion and instability of solid electrolyte interface film are easy to occur during the charging and discharging cycle of lithium metal, which cause limited safety and cycling problems. These problems will be more serious under the condition of large current density and large capacity charge and discharge, which will greatly affect the cycle stability and service life of the battery.

[Job Description]