A team of Wu Zhongshuai, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has developed a new three-dimensional, highly conductive, lithium-philic MXene / graphene porous aerogel new material, and successfully applied it to high lithium loading, high capacity, and dendrite-free metallic lithium As a negative electrode, a lithium metal battery with high specific energy and long life is obtained. Related research results were published in "American Chemical Society-Nano".
Lithium metal has an ultra-high-quality theoretical specific capacity (3860 mAh / g) and the lowest redox voltage, and is considered to be a very promising anode material for high specific energy lithium batteries. However, due to its uncontrollable lithium dendrites, dead lithium, and volume expansion of lithium metal during charging and discharging, it leads to poor lithium metal cycle performance and low safety performance, which limits the lithium metal anode in high specific energy lithium metal batteries. Practical application.
This three-dimensional MXene / graphene porous aerogel material can be used as a carrier for lithium metal, successfully constructed a flexible, with a high lithium load (3560 mAh / g) and a high specific surface area (259 m2 / each G), negative electrode with excellent conductivity and good lithium affinity. A high Coulomb efficiency (99%) is achieved, which significantly improves the cycle stability of the metal lithium anode.
The researchers also applied the lithium metal anode to lithium-sulfur and lithium / lithium titanate full batteries, all showing high specific capacity, excellent cycle stability, and rate performance. This three-dimensional high-conductivity lithium-philic network structure design strategy provides new ideas for the construction of lithium metal batteries with high energy density and long cycle life.