Boron Embedded in Metal Iron Matrix as a Novel Anode Material of Excellent Performance

Abstract

Boron, the most ideal lithium-ion battery anode material, demonstrates highest theoretical capacity up to 12 395 mA h g when forming Li B. Furthermore, it also exhibits promising features such as light weight, considerable reserves, low cost, and nontoxicity. However, boron-based materials are not in the hotspot list because Li B may only exist when B is in atomically isolated/dispersed form, while the aggregate material can barely be activated to store/release Li. At this time, an ingenious design is demonstrated to activate the inert B to a high specific capacity anode material by dispersing it in a Fe matrix. The above material can be obtained after an electrochemical activation of the precursors Fe B/Fe and B O /Fe. The latter harvests the admirable capacity, ultrahigh tap density of 2.12 g cm , excellent cycling stability of 3180 mA h cm at 0.1 A g (1500 mA h g ) after 250 cycles, and superlative rate capability of 2650 mA h cm at 0.5 A g , 2544 mA h cm at 1.0 A g , and 1696 mA h cm at 2.0 A g . Highly conductive matrix promoted reversible Li storage of boron-based materials might open a new gate for advanced anode materials.

Advanced Cu-free Bipolar Solid-state Lithium-ion Battery Promoted by Li+ Conductive Matrix Enabled Excellent Iron Oxide Anode

“…The capacity in 3 − 0.7 V is contributed by conversion reaction of FeOx, which is ~650 mA h g −1 and remains stable along with the cycling. The capacity in 0.7 V -0.01 V can be attributed the lithium storage of B species, as indicated in our previous work 16 . This reaction is difficult to occur at first but may be activated during the long-term cycling and thus contribute increasing capacity.…”

“…A strong and broad peak located at ~0.6 V present the conversion reaction of FeOx (or LinFeOx) and the formation of surface electrolyte interface (SEI) layer, which shift to ~0.7 V after initial cycle. The peak near 0 V may result from the Li storage of B species, as indicated by our previous work 16 . The bare FeOx have the similar but sharper peak located at ~0.6…”

“…In order to confirm the above suspect, we performed the ex-situ B 1s X-ray photoelectron spectroscopy (XPS) of cycled FeOx-LFBO electrodes. Normally, trivalent B 1s is located at ~192 eV, and it is deemed incapable of storaging Li 16 .…”

Tip-Sonicated Red Phosphorus-Graphene Nanoribbon Composite for Full Lithium-Ion Batteries

“…Both RP-25–GNR and RP-39–GNR delivered higher capacity at 0.4C (∼1 A/g) compared to traditional anode materials for LIBs (Table ). − …”

Controllable and Scale-Up Synthesis of Nickel-Cobalt Boride@Borate/RGO Nanoflakes via Reactive Impingement Mixing: A High-Performance Supercapacitor Electrode and Electrocatalyst

“…In the past decade, transition metal borides (TMBs) have been particularly attractive for applications in hydrogen evolution reaction, OER, lithium-ion batteries, and supercapacitors because of their abundant electroactive sites arising from the electron deficiency of boron atoms ( Park et al, 2017 ; Dong et al, 2018 ; Chen et al, 2019b ; Guo et al, 2019 ). Among them, Ni-B is extensively studied as a pseudocapacitive electrode material and an OER electrocatalyst due to its large theoretical specific capacitance and superior intrinsic activity, respectively ( Chen et al, 2019a ; Li et al, 2019 ).…”