Mn₂Sb₂O₇/Reduced Graphene Oxide Composites with High Capacity and Excellent Cyclic Stability as Anode Materials for Lithium‐Ion Batteries

Abstract

For the advancement of lithium-ion batteries (LIBs), metal oxides with high theoretical specific capacities have been explored as anodes. Herein, we report a new metal oxide, Mn 2 Sb 2 O 7 -anchored reduced graphene oxide (Mn 2 Sb 2 O 7 /RGO), as an advanced anode for LIBs. The Mn 2 Sb 2 O 7 /RGO anode exhibits a higher capacity and better capacity retention compared to Mn 2 Sb 2 O 7 , because the close contact between Mn 2 Sb 2 O 7 and RGO facilitates charge transfer during cycling.The discharge capacity of Mn 2 Sb 2 O 7 /RGO reaches 706.72 mAh g À 1 at 200 mA g À 1 after 200 cycles. Even at 1000 mA g À 1 , the capacity loss per cycle of Mn 2 Sb 2 O 7 /RGO is only 0.0344 % for 600 cycles, indicating an excellent high-rate cyclic stability compared to other Sb-based oxides. These results forecast that Mn 2 Sb 2 O 7 /RGO is a potential anode for LIBs, providing a new insight into the selection of high-performance anodes.

Using Peanut Shells to Construct a Porous MnO/C Composite Material with Highly Improved Lithium Storage Performance

“…A smaller value of R ct implies a higher electronic conductivity of the material. [16] The values of R ct for the fresh MnO/C and the MnO/C after 200 cycles are 74.6, 87.4 Ω, respectively. The R ct values of the fresh MnO and the MnO after 200 cycles are 142.7, 171.5 Ω, respectively.…”

“…The radius of the semicircle in the EIS spectra corresponds to the R ct . A smaller value of R ct implies a higher electronic conductivity of the material . The values of R ct for the fresh MnO/C and the MnO/C after 200 cycles are 74.6, 87.4 Ω, respectively.…”

“…Taking advantage of these merits, MnO recombination with carbon is not only beneficial to maintaining the high capacity, but also stabilizing the structure of materials, and thus improving long-term cycling performance as well as rate performance. So far, polydopamine, [15] graphene, [16] microalgae, [17] MOF [14] and other carboncontaining [18][19][20] substances were used as the carbon source.…”

Synergistic Structural Engineering of Tunnel‐Type Polyantimonic Acid Enables Dual‐Boosted Volumetric and Areal Lithium Energy Storage

“…The redox pairs at ≈0.75 V during reduction and ≈1.36 V during oxidation can be attributed to the alloying reaction between Sb 0 and Li to form the Li x Sb alloy and the dealloying reaction of Li x Sb to elemental Sb 0 , which can be stabilized at 0.8 V/1.3 V in the subsequent second and third scans. [14,44,49] Note that there is another pair of redox peaks located at 0.31 V/0.945 V, which could be attributed to reduction of Mn 2+ to metallic Mn 0 and the reversible oxidation of Mn 0 to Mn 2+ , respectively, together with the reversible formation/decomposition of Li 2 O. [49] There is an obvious difference between the first and subsequent cycles in the range of 0.5-0.75 V, which is attributed to the formation of solid electrolyte interfaces (SEI) layer.…”

“…[14,44,49] Note that there is another pair of redox peaks located at 0.31 V/0.945 V, which could be attributed to reduction of Mn 2+ to metallic Mn 0 and the reversible oxidation of Mn 0 to Mn 2+ , respectively, together with the reversible formation/decomposition of Li 2 O. [49] There is an obvious difference between the first and subsequent cycles in the range of 0.5-0.75 V, which is attributed to the formation of solid electrolyte interfaces (SEI) layer. Besides, the reduction peaks below 0.2 V correspond to the Li + intercalation into the graphite layers of FG, while the oxidation peaks are regarded as the Li deintercalation process.…”