NanoEnergy: porous nitrogen-doped MXene for lithium-sulfur batteries

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【Research Background】

       The increasing demand for sustainable energy supply has stimulated the continuous development of advanced energy storage systems. Because of its high energy density of 2600 Wh kg-1, the theoretical capacity of 1672 mAh g-1, and the rich sulfur element on earth, lithium-sulfur batteries have become a promising alternative to lithium-ion batteries. However, the commercialization of lithium batteries is still plagued by the infamous "shuttle effect" and lagging reaction kinetics, which is caused by the complex liquid-solid phase conversion of polysulfides (LiPSs) to lithium sulfide and multi-electron conversion of. These shortcomings lead to irreversible loss of sulfur and substantial destruction of the electrochemical environment, leading to a decline in rate performance and a rapid decline in capacity.

【Achievement Introduction】

       Recently, Professor Zhang Qiang of Tsinghua University and Professor Sun Jingyu of School of Energy, Soochow University published the research paper in the top international academic journal Nano Energy :  Rational design of porous nitrogen-doped  Ti 3 C 2  MXene as a multifunctional electrocatalyst for Li–S chemistry  research paper . In this paper, the multi-functional catalysis of porous nitrogen-doped MXene in lithium-sulfur battery system was investigated in detail.

【Graphic introduction】

Figure 1. Synthesis and characterization of P-NTC .

Figure 2. Experimental study on the ability of P-NTC to capture polysulfides.

Figure III . Kinetic analysis thioredoxin.

Figure 4. The role of P-NTC electrocatalyst in Li-S battery.

Figure V . Electrochemical tests.

Figure VI .  High S load the flexible pouch and the negative electrode cell electrochemical performance.

【Summary of this article】

   In summary, this paper adopts a feasible sacrificial template strategy as an effective matrix material for lithium batteries to achieve a rational design of porous n- doped Ti 3 C 2  MXene . P-NTC has rich nitrogen doping, good conductivity and porous structure, not only can be used as an inhibitor of the shuttle effect, but also can be used as a multifunctional electrocatalyst to promote the precipitation and decomposition of lithium sulfide.

Literature link:

https://doi.org/10.1016/j.nanoen.2020.104555

Source: MXene Frontier