Co2B2O5 as an anode material with high capacity for sodium ion batteries

Abstract

In this work, a flake-structured Co 2 B 2 O 5 material was obtained by a simple sol-gel method and researched for use in sodium ion batteries firstly. When serving as anode material for sodium ion batteries, it exhibits the high initial reversible capacity of 466 mAhÁg -1 at a current density of 100 mAÁg -1 . Through the recombination of carbon nanotubes (CNTs), the composite Co 2 B 2 O 5 /CNTs delivers the initial reversible capacity of 464 mAhÁg -1 , and 324 mAhÁg -1 is obtained after 60 cycles under the current density of 100 mAÁg -1 . When under the current density of 1000 mAÁg -1 , a capacity of 236 mAhÁg -1 is obtained for Co 2 B 2 O 5 /CNTs while 160 mAhÁg -1 for Co 2 B 2 O 5 . Moreover, the sodium storage behavior of Co 2 B 2 O 5 is identified by kinetic analysis. The higher Na ? capacitive contribution of Co 2 B 2 O 5 /CNTs could account for the enhanced rate performance. The results indicate that Co 2 B 2 O 5 is a promising anode material for sodium ion batteries.

Anisotropic thermal expansion and electronic transitions in the Co3BO5 ludwigite

“…[1][2][3][4] Recently, there has also been steady interest in these materials for applications in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). [5][6][7][8][9] Due to its high affinity for oxygen, boron forms two fundamental building blocks (FBB), namely the BO 3 triangle with sp 2 hybridization and the BO 4 tetrahedron with sp 3 hybridization, which can spatially combine resulting in a wide variety of chemical compositions and crystal structures. The presence of rigid borate units causes anisotropy of the thermal expansion.…”

“…1–4 Recently, there has also been steady interest in these materials for applications in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). 5–9…”

Sodiation mechanism via reversible surface film formation on metal oxides for sodium‐ion batteries

“…[ 8,9 ] Different organic, [ 10 ] and inorganic anode materials have been investigated concerning their applicability in SIBs. [ 11,12 ] Metal oxide materials, [ 13–15 ] especially titanium (Ti) based oxide materials are proposed as one example of a promising anode candidate for SIBs. [ 16–19 ] Mainly the simplicity of nano‐structuring titanium dioxide (TiO 2 ) based materials makes emerge numerous materials science based studies on electrode design and performance, such as graphene‐supported TiO 2 nanospheres, [ 20 ] graphene‐coupled TiO 2 sandwich‐like hybrids, [ 18 ] flowerlike shaped brown, [ 21 ] and self‐organized TiO 2 nanotubes (NTs).…”

In Situ Secondary Phase Modified Low-Strain Na3Ti(PO3)3N Cathode Achieving Fast Kinetics and Ultralong Cycle Life

“…To date, various types of cathode materials (i.e., layered-type transition-metal oxides, polyanionic-type cathodes, Prussian blue and its analogues (PBAs), organic salts) have been reported for SIBs with improved electrochemical performance. ,− Among them, polyanionic-type cathode materials have attracted a great deal of attention because of their ideal sturdy frameworks and three-dimensional (3D) Na + diffusion pathways. ,− The most studied polyanionic-type cathode material for SIBs is the vanadium-based Na + superionic conductor (NASICON)-structured material (Na 3 V 2 (PO 4 ) 3 (NVP)) because of its appropriate redox potential and remarkable cyclic stability. ,− However, vanadium in all valence states has environmental toxicity and human carcinogenicity. , In contrast, titanium with multiple oxidative states possesses the advantages of being nontoxic and inexpensive and having better stability, thus arousing great interest in titanium-based materials. Accordingly, the NASICON-structured NaTi 2 (PO 4 ) 3 material (NTP) with high Na + conductivity has been extensively studied, , but the relatively low working potential (∼2.1 V) cannot meet the cathode requirement.…”