Abstract
Sodium-ion batteries are promising candidates for energy storage application, but the absence of high-capacity and low-cost anode materials significantly limits their practical specific energy and cost. Red phosphorus (RP) possesses a high theoretical specific capacity but suffers from large volume change, low electronic conductivity, and unstable solid-electrolyte interphase (SEI). Herein, a hierarchical micro/nanostructured antimony-doped RP/carbon anode was developed, which demonstrates extraordinary electrochemical performance with high initial Coulombic efficiency of ≈90%, high areal capacity (≈1.7 mAh cm-2), and good cycle stability and rate capability. Combined experimental and computational studies consistently revealed that such a unique structural design can dramatically accommodate the mechanical stress and moreover effectively restrain the undesired decomposition of electrolyte solvents regardless of electrolyte formulation, resulting in superior structural integrity and thin and robust SEI formation during cycling. The present finding has offered an alternative strategy for stress management and interface engineering on high-capacity alloying-based anode materials.
| Original language | English |
|---|---|
| Pages (from-to) | 547-556 |
| Number of pages | 10 |
| Journal | ACS Energy Letters |
| Volume | 6 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 12 2021 |
Funding
Research at Argonne National Laboratory was funded by the U.S. Department of Energy (DOE), Vehicle Technologies Office. Use of the Center for Nanoscale Materials and the Advanced Photon Source, both Office of Science user facilities, was supported by the U.S. DOE, Office of Science and Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357. G.X. and K.A. are thankful for support from Tien Duong of the U.S. DOE’s Office of Vehicle Technologies Program. B.W. and X.L. are thankful for the support from the U.S Department of Energy (DOE) Office of Electricity (Contract 70247A).