Solvothermal Synthesis of Porous MnF₂ Hollow Spheroids as Anode Materials for Sodium‐/Lithium‐Ion Batteries

Abstract

Porous MnF2 hollow spheroids are synthesized by using a facile solvothermal method. As‐synthesized MnF2 exhibits excellent electrochemical properties. The high reversible capabilities of 0.533 Ah/g at 0.057 A/g and 0.453 Ah/g at 0.577 A/g are obtained after 150 cycles for lithium‐ion batteries. Furthermore, the same MnF2 displays a high reversible specific capacity of 0.199 Ah/g at 2.308 A/g. As to sodium‐ion batteries, an initial reversible capability of 0.41 Ah/g at 0.01 A/g can be acquired and 0.154 Ah/g at 0.05 A/g can be retained after 150 cycles. It is noteworthy that as‐synthesized MnF2 could be a promising anode material in both sodium‐ and lithium‐ion batteries.

Bio‐Inspired Electrodes with Rational Spatiotemporal Management for Lithium‐Ion Batteries

“…The natural porous structures are often associated with the high surface areas. [ 399 ] Thus, the hollow cavity can provide free space for strain relaxation and volume‐change accommodation of the electrode materials during the lithiation–delithiation cycling process. As a consequence, the pulverization of electrode materials will be alleviated and hence the electrochemical performance achieves significant improvement.…”

Extending Calendar Life of Si-Based Lithium-Ion Batteries by a Localized High Concentration Electrolyte

“…Figure 4i compares XPS spectra of Si anode cycled in Si-BE electrolyte (top figures) and the E10 electrolyte (bottom figures). The clear peaks associated with Ni (69.0 eV in N 3p), 39 Co (CoF 2 at 785.4 eV in Co 2p), 40 and Mn (compounds of MnO, MnF 2 , and MnO 2 at 641.0, 654.7, and 642.7 eV in Mn 2p) 41,42 have been identified on the Si anode cycled in Si-BE electrolyte as shown in the top spectra of Figure 4i. This is a clear indication of crosstalk effect, i.e., the dissolved transition metal ions (Ni, Mn, and Co) moved from the cathode side to the anode side, which is detrimental to ion transport and cell performance.…”