Increasing the energy density of lithium-ion batteries requires the discovery of new electrode materials capable of achieving very high areal capacity. Here, liquid phase exfoliation is used to produce nanosheets of SnP3, a 2D material with extremely high theoretical capacity of 1670 mAh g−1. These nanosheets can be fabricated into solution-processed thin films for use as lithium storing anodes. To maximize their performance, carbon nanotubes are incorporated into the electrodes to simultaneously enhance conductivity and toughness. As a result, electrodes of thickness >300 µm can be produced, which display active-mass-normalized capacities (≈1657 mAh g−1Active) very close to the theoretical value. These materials show maximum specific (≈1250 mAh g−1Electrode) and areal (>20 mAh cm−2) capacities, which are at the state-of-the-art for 2D-based electrodes, coupled with good rate performance and stability. In combination with commercial cathode materials, full-cells are fabricated with areal capacities of ≈29 mAh cm−2 and near-record energy densities approaching 1000 Wh L−1.
Bibliographical noteFunding Information:
The authors acknowledge the European Research Council Advanced Grant (FUTURE‐PRINT) and the European Union under Grant Agreement No. 785219 Graphene Flagship‐core 2. The authors also received support from the Science Foundation Ireland (SFI) funded center AMBER (SFI/12/RC/2278) and availed of the facilities of the SFI‐funded AML and ARM labs. The authors also thank Nokia‐Bell Labs Ireland for continuing support. M.M. thanks the Irish Research Council for funding.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)