Electrochemically Induced Borate Allotropes for Expedite Charge Transfer in Lithium‐Ion Batteries and Hydroxyl Ion Capture Activity in Flexible Pseudocapacitor

Abstract

Despite lithium-ion battery (LIB) and supercapacitor materials have gone through numerous enhancements, achieving high energy density as well as power density together is still a dream for the industries. In this scenario, herein we report, boric acid coated αÀ MnO 2 anode with 1288 mAh g À 1 at 0.1 C at the initial cycle and of an average discharge capacity of 570 mAh g À 1 at 0.1 C over 20 cycles, high-rate capability and 100 % Coulombic efficiency after 60 cycles for LIB. The Li + diffusion coefficient estimated from GITT and EIS measurements reveals that the H 3 BO 3 coated αÀ MnO 2 electrode has superior Li-ion kinetics ( D Li þ ~10 À 10 cm 2 s À 1 ) than bare αÀ MnO 2 . Coin cells with boric acid coated αÀ MnO 2 electrode are able to power up red and blue LEDs continuously for about 24-32 hours. The ex-situ investigations reveal an interesting self-assembled active electrodeelectrolyte interfacial bridging Li 4 B 2 O 5 layer formation. This significant active layer allows free migration of lithium ions across interface that leads to good cyclability. In flexible supercapacitor, the boric acid coated αÀ MnO 2 yields excellent cyclability over 500 cycles with specific capacitance of 35 F g À 1 at 1 A g À 1 and further 200 cycles at 30°acute angle with 21 F g À 1 at 1 A g À 1 . The research overthrows the significance of boric acid in conversion reactions for active interfacial bridging layer in LIB and hydroxyl ion capturing agent in flexible supercapacitor.

Unveiling the Ultrahigh-Voltage Platform of Hydrated V3O7 in Carbon Network for Enhancing Aqueous Zinc-Ion Batteries Performance

“…To prove the exceptional performance of the prepared hydrated V 3 O 7 @C layered nanosheets in ultrahigh-voltage platform, we have compared our results with other vanadium based cathode materials for AZIB application. From Figure a it is very clear that our material exhibits an ultrahigh-voltage platform and superior stability compared to various benchmark vanadium-based counterparts and the corresponding values are tabulated in Table S3 . Additionally, to further validate our results, we also compared our material’s performance with different vanadium-based cathode materials in terms of energy and power density and presented the results in Figure b. , Detailed values of the compared data are shown in Table S4.…”