Boosting ultrafast Li storage kinetics of conductive Nb-doped TiO2 functional layer coated on LiMn2O4

Sung, Ki‐Wook; Shin, Dong-Yo; Ahn, Hyo‐Jin

doi:10.1016/j.jallcom.2021.159404

Cited by 19 publications

(8 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the magnified XRD curves in Figure 4B show that two peaks corresponded with the (101) and (111) planes gradually shift toward lower angles from CNF@SnSNT‐C5 to CNF@SnSNT‐C10, indicates the extended interlayer distance of SnS owing to the increased insertion of S ions as a result of the increased amount of L‐cysteine 25,26 . The extended interlayer distance can also increase the ion‐transfer rate; therefore, the ultrafast cycling capability gradually increased from CNF@SnSNT‐C5 to CNF@SnSNT‐C10 25,27,28 . In Figure 4C, TGA was carried out to confirm the component ratios of all samples.…”

Section: Resultsmentioning

confidence: 97%

“…25,26 The extended interlayer distance can also increase the iontransfer rate; therefore, the ultrafast cycling capability gradually increased from CNF@SnSNT-C5 to CNF@SnSNT-C10. 25,27,28 In Figure 4C, TGA was carried out to confirm the component ratios of all samples. Although the bare CNF exhibited complete weight loss, the fabricated core-shell structures underwent partial weight loss (CNF@SnSNT-C5: 36.84%; and CNF@SnSNT-C10: 31.12%), implying that the inserted S ions in the layered SnS and doped S atoms in the carbon layer increased to the enhanced L-cysteine effect.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Sung

Ahn

2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

Summary Combining a high‐capacity material possessing a core@shell structure with a carbon material is a powerful tactic for reinforcing the performance of Li‐ion battery (LIB) anodes. As an efficient and simple approach to obtain tin(II) sulfide (SnS) with ultrafast lithium‐storage capability and cycling stability, we propose the hierarchical core@shell structure of carbon nanofibers@SnS nanotubes (CNF@SnSNTs) covered with S‐doped carbon via a one‐pot carbonization by harnessing the Kirkendall effect of camphene and sulfurization of SnO2 by L‐cysteine. This hierarchical core@shell structure contains mesoporous carbon nanofibers (CNFs) that reduce the Li‐ion diffusion pathway, SnS nanotubes (NTs) that expand the active site, and a S‐doped carbon layer at the faces of the SnS NTs that promotes the electrical conductivity and inhibits volume expansion of SnS. Therefore, a CNF@SnSNT‐C7 electrode achieves superb ultrafast electrochemical performance (528.1 mAh/g under a current density of 2000 mA/g), high specific capacity (2218.2 mAh/g under a current density of 100 mA/g), and an ultrafast cycling stability of 92.9% after 500 cycles under a current density of 2000 mA/g. These performance improvements are resulted from the synergistical effect of mesoporous CNFs, SnS NTs, and S‐doped carbon layer. Therefore, CNF@SnSNT is potential anode material for LIBs having superior Li‐storage capability.

show abstract

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Sung

Ahn

2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The first approach is element doping, where the new element can act as a pillar ion to strengthen the structural integrity under high voltage 14,15 . Secondly is the surface coating, which can protect the surface lattice from being distorted at high voltage 16 . Myriad groups have put their emphasis to preserve the structure of LiMn 2 O 4 at high voltage by doping at manganese site with foreign ions such Al, Cr, Cu, Ni, and S 17–20 .…”

Section: Introductionmentioning

confidence: 99%

“…14,15 Secondly is the surface coating, which can protect the surface lattice from being distorted at high voltage. 16 Myriad groups have put their emphasis to preserve the structure of LiMn 2 O 4 at high voltage by doping at manganese site with foreign ions such Al, Cr, Cu, Ni, and S. [17][18][19][20] It is undeniable that these elements can enhance structural stability and improve the cycling performance. However, the direct doping is less effective in preventing hydrofluoric acid (HF) attack and Mn dissolution into electrolyte due the direct contact between active material and electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Improved cycling stability of V₂O₅ modified spinel LiMn₂O₄ cathode at high cut‐off voltage for lithium‐ion batteries

Radzi

Kufian

Vengadaesvaran

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Spinel lithium manganese oxide, LiMn2O4 coated with V2O5 layer (labeled as LMO‐VO) has been developed and its electrochemical performances as cathode material for lithium‐ion batteries has been evaluated at high cut‐off voltage (>4.5 V vs. Li/Li+) and compared with pristine LiMn2O4 (labeled as LMO). The crystal structure investigations show that LMO‐VO has longer Li–O bond length for fast Li‐ion diffusion kinetic process. The scanning electron microscopy results indicate that LMO‐VO has finer particles and the V2O5 layer has been successfully coated on the LMO surface uniformly. The highly conductive V2O5 coating layer enhances the ionic conductivity of the LMO cathode, as evidenced by the significant drop of Rct value from the Nyquist plot. Under high operating voltage, the cell employed with coated LMO shows exceptional cycling performance in capacity retention and potential difference. After 300 cycles, the capacity retention per cycle has been boosted from 99.90% to 99.94% by adopting the V2O5 coating layer. In addition, surface coating with V2O5 stabilizes the potential difference at very minimal change for a longer period. This convincingly proves that the V2O5 coating layer not only protects against hydrofluoric acid (HF) attack and greatly restrains the increase of cell polarization at high voltage.

show abstract

“…7,8 To overcome these problems, interfacial engineering is crucial strategy used to enhance the mechanical, electrochemical, and chemical stabilities of LIBs by designing a geometrical structure of interfaces. In terms of active materials, various studies have been conducted to prevent volume expansion, dissolution, and unstable surface reactions using the surface coating method (eg, LiAlO 2 coated LMO, 9 NB-doped TiO 2 coated LMO, 10 Li 2 CO 3 /LiNbO 3 coated NCM622, 11 and LiAlO 2 @Al 2 O 3 coated NCA 12 ). However, despite the improved surface properties of the active materials, an exfoliation of the electrode at the surface of the current collector remains a grave problem.…”

Section: Introductionmentioning

confidence: 99%

Carbon quantum dot‐laminated stepped porous Al current collector for stable and ultrafast lithium‐ion batteries

Sung

Kim

Ahn

2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

Designing an interfacial architecture between the current collector and electrode plays a serious role in developing the specific capacity with cycling stability of lithium-ion batteries (LIBs). Consequently, an original approach to enhance the structure of the interface between the current collector and electrode is necessary. Thus, we developed a novel interface architecture based on carbon quantum dots (CQDs)-laminated on a stepped porous Al (SP-Al) current collector to attain stable and ultrafast-discharge LIBs and CQD-SP-Al for application as LIB cathodes. To this end, the electrochemical etching and ultrasonic spray coating methods were employed. The cathode assembled with CQD-SP-Al displayed the adhesion enhancing, an increased redox reaction kinetics, and the magnificent interfacial stability of the current collector//electrode interface because of the increased surface roughness, stepped pores with N-doped CQD, and uniform CQD lamination layer. The resultant cathode with CQD-SP-Al showed an enhanced specific capacity of 78.2 mAh/g and capacity retention of 92.6% at a high C-rate of 10C after 500 cycles. This great cycling stability is due to an expanded interfacial contact area of current collector// electrode with improved adhesion, as well as to the CQD lamination layer, while the excellent ultrafast discharge capacity is ascribed to the risen number of charge supplying/collecting sites, the stepped porous structure, and the highly conductive N-doped CQD lamination layer.

show abstract

Boosting ultrafast Li storage kinetics of conductive Nb-doped TiO2 functional layer coated on LiMn2O4

Cited by 19 publications

References 36 publications

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Improved cycling stability of V₂O₅ modified spinel LiMn₂O₄ cathode at high cut‐off voltage for lithium‐ion batteries

Carbon quantum dot‐laminated stepped porous Al current collector for stable and ultrafast lithium‐ion batteries

Contact Info

Product

Resources

About

Boosting ultrafast Li storage kinetics of conductive Nb-doped TiO2 functional layer coated on LiMn2O4

Cited by 19 publications

References 36 publications

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Hierarchical carbon nanofibers@tin sulfide nanotube with sulfur‐doped carbon layer for ultrafast lithium‐storage capability

Improved cycling stability of V2O5 modified spinel LiMn2O4 cathode at high cut‐off voltage for lithium‐ion batteries

Carbon quantum dot‐laminated stepped porous Al current collector for stable and ultrafast lithium‐ion batteries

Contact Info

Product

Resources

About

Improved cycling stability of V₂O₅ modified spinel LiMn₂O₄ cathode at high cut‐off voltage for lithium‐ion batteries