High performance columnar-like Fe2O3@carbon composite anode via yolk@shell structural design

Long cycle life and high rate capability of three dimensional CoSe2 grain-attached carbon nanofibers for flexible sodium-ion batteries

High-power sodium-ion batteries capable of charging and discharging rapidly and durably are eagerly demanded to replace current lithium-ion batteries. However, poor activity and instable cycling of common sodium anode materials represent a huge barrier for practical deployment. A smart design of ordered nanotube arrays of iron oxide (Fe2 O3 ) is presented as efficient sodium anode, simply enabled by surface sulfurization. The resulted heterostructure of oxide and sulfide spontaneously develops a built-in electric field, which reduces the activation energy and accelerates charge transport significantly. Benefiting from the synergy of ordered architecture and built-in electric field, such arrays exhibit a large reversible capacity, a superior rate capability, and a high retention of 91% up to 200 cycles at a high rate of 5 A g-1 , outperforming most reported iron oxide electrodes. Furthermore, full cells based on the Fe2 O3 array anode and the Na0.67 (Mn0.67 Ni0.23 Mg0.1 )O2 cathode deliver a specific energy of 142 Wh kg-1 at a power density of 330 W kg-1 (based on both active electrodes), demonstrating a great potential in practical application. This material design may open a new door in engineering efficient anode based on earth-abundant materials.

Highly Efficient Sodium Storage in Iron Oxide Nanotube Arrays Enabled by Built-In Electric Field.

Progress on iron oxides and chalcogenides as anodes for sodium-ion batteries

Recent progress on iron- and manganese-based anodes for sodium-ion and potassium-ion batteries

Three-dimensional hierarchical porous Na3V2(PO4)3/C structure with high rate capability and cycling stability for sodium-ion batteries

A mesoporous graphitic carbon-encapsulated Fe2 O3 nanocomposite is synthesized as a superior anode material for sodium-ion batteries. A threefold strategy is adopted to achieve a high rate performance. First, the mesoporous structure with high specific surface area and large pore volume facilitates the transfer of electrolyte and accommodates the large volume change. Secondly, graphitic carbon encapsulation further improves the electronic conductivity of the nanocomposite. Finally, ultrafine Fe2 O3 nanocrystals effectively shorten the Na+ diffusion length. Consequently, this nanocomposite exhibits stable and fast Na+ storage, thus leading to excellent rate capability and cyclability. Pseudocapacitive behavior is found to dominate in the redox reactions, accounting for the outstanding rate and cycling performance. In addition, full cells, assembled with O3-Na0.9 [Cu0.22 Fe0.30 Mn0.48 ]O2 as cathodes, present good electrochemical performance.

Mesoporous Graphitic Carbon‐Encapsulated Fe2O3 Nanocomposite as High‐Rate Anode Material for Sodium‐Ion Batteries

Nitrogen-Doped graphene coated FeS2 microsphere composite as high-performance anode materials for sodium-ion batteries enhanced by the chemical and structural synergistic effect

Mingjing Wang

Papers

Three-dimensional hierarchical porous Na3V2(PO4)3/C structure with high rate capability and cycling stability for sodium-ion batteries

Mesoporous Graphitic Carbon‐Encapsulated Fe2O3 Nanocomposite as High‐Rate Anode Material for Sodium‐Ion Batteries

Nitrogen-Doped graphene coated FeS2 microsphere composite as high-performance anode materials for sodium-ion batteries enhanced by the chemical and structural synergistic effect