Truncated octahedral LiMn 2 O 4 cathode for high-performance lithium-ion batteries

Hwang, Bo-Mi; Kim, Si-Jin; Lee, Young-Woo; Park, Han-Chul; Kim, Da-Mi; Park, Kyung-Won

doi:10.1016/j.matchemphys.2015.03.052

Cited by 25 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Galvanostatic cycling was also used to study capacity and capacity fade during repetitive charge–discharge cycles. Galvanostatic discharge curves (Figure a) show continuously sloping voltages during lithium intercalation and deintercalation rather than plateaus at distinct voltages, which occurs with bulk and larger crystallite systems. ,− These sloping voltage profiles are considered one of the hallmarks of pseudocapacitive behavior . At a rate of 50 C , this material stores approximately 0.3 mol of lithium per mole of Li x Mn 2 O 4 (1 < x < 2), corresponding to a capacity of around 44 mAh/g.…”

Section: Resultsmentioning

confidence: 99%

“…A previously reported procedure was followed to synthesize 4–5 nm Mn 3 O 4 nanocrystals stabilized by oleylamine ligands. , Briefly, 0.17 g manganese(II) acetate, 0.57 g of stearic acid, and 3.2 mL of oleylamine were dissolved in 15 mL of xylene and stirred at 90 °C for 3 h in air to produce Mn 3 O 4 nanocrystals. Mn 3 O 4 nanocrystals were washed several times with ethanol before being dispersed in hexane (10–15 mg/mL).…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Currently, LiCoO 2 is the most widely used cathode material for lithium-ion batteries. Although LiCoO 2 along with other materials of the form LiMO 2 (where M is a transition metal) are layered and show good cycling stability in bulk, they do not show reliable cycling stability when nanostructured for fast lithium-ion intercalation. − One reason for this is that the insertion and removal of lithium ions results in a phase transition between trigonal and monoclinic lattice structures. − Aside from the lack of rapid diffusion kinetics, LiMO 2 materials are known to operate in the 3–4 V range versus lithium metal. , To increase this potential range above 4 V, while maintaining structural stability, one option appears to be the mixed-valent transition metal spinel LiMn 2 O 4 . − LiMn 2 O 4 shows activity in the 4–4.5 V range with reasonable structural robustness upon cycling. The structure contains lithium ions within tetrahedral sites that can be repeatedly inserted and removed while the structure remains in the tetragonal phase. ,− Because it does not contain a planar or linear channeled structure, however, fast ion intercalation is not observed in bulk versions of this material, but creating nanoscale versions of this material including nanocrystals and nanowires shows promise for improved kinetics. ,− One complication noted for LiMn 2 O 4 (LMO) is that discharge rates can be much higher than charge rates, and for many applications, it is fast charging that is key to expanded use. − For the work presented here, all charge and discharge rates are the same, so that materials with fast kinetics should be useful for both high output power and fast charging applications.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors

et al. 2016

View full text Add to dashboard Cite

Charge storage devices with high energy density and enhanced rate capabilities are highly sought after in today's mobile world. Although several high-rate pseudocapacitive anode materials have been reported, cathode materials operating in a high potential range versus lithium metal are much less common. Here, we present a nanostructured version of the well-known cathode material, LiMn2O4. The reduction in lithium-ion diffusion lengths and improvement in rate capabilities is realized through a combination of nanocrystallinity and the formation of a 3-D porous framework. Materials were fabricated from nanoporous Mn3O4 films made by block copolymer templating of preformed nanocrystals. The nanoporous Mn3O4 was then converted via solid-state reaction with LiOH to nanoporous LixMn2O4 (1 < x < 2). The resulting films had a wall thickness of ∼15 nm, which is small enough to be impacted by inactive surface sites. As a consequence, capacity was reduced by about half compared to bulk LiMn2O4, but both charge and discharge kinetics as well as cycling stability were improved significantly. Kinetic analysis of the redox reactions was used to verify the pseudocapacitive mechanisms of charge storage and establish the feasibility of using nanoporous LixMn2O4 as a cathode in lithium-ion devices based on pseudocapacitive charge storage.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The electrodes lost approximately 1 mA h g −1 per cycle, and only retained a discharge capacity of 88 mA h g −1 with capacity retention of 60% after 51 cycles. The unsatisfied cyclic performance might be ascribed to several factors: (i) the presence of secondary phase, Li 2 SiO 3 , (ii) the unidentified irreversible oxidation reaction at 3.80 V as revealed in CV curves, (iii) the possible structural change resulting from the Jahn-Teller effect as that occurred in pristine LiMn 2 O 4 during insertion and extraction of Li + , (iv) the serious polarization caused by the poor electrical conductivity [37], and (v) possible Mn dissolution upon cycling according to disproportional reaction: Mn 3+ → Mn 4+ + Mn 2+ [14,[38][39][40]. Although the battery performance of LiMn 2−x Si x O 4 falls short of expectation, it is much better than that of pristine spinel LiMn 2 O 4 as reported in literatures.…”

Section: +mentioning

confidence: 99%

Spinel LiMn2−x Si x O4 (x < 1) through Si4+ substitution as a potential cathode material for lithium-ion batteries

et al. 2016

View full text Add to dashboard Cite

Spinel LiMn2−xSixO4 (x< 1, through substituting Mn 4+ with Si 4+ in cubic spinel LiMn2O4) was synthesized successfully by a facile sol-gel method. The as-prepared LiMn2−xSixO4 consisted of pores with large size distribution range from a few nanometers to over 200 nm and possessed specific surface area of 8.76 m 2 g −1 . Results of X-ray powder diffraction and X-ray photoelectron spectroscopy confirmed that Si atoms entered the host lattice. As a cathode material for rechargeable lithium-ion batteries, spinel LiMn2−xSixO4 exhibited excellent structural reversibility and integrity during the charging-discharging process. The result indicated that substitution of Mn 4+ by Si 4+ in spinel LiMn2O4 material effectively alleviated the phase transition caused by Jahn-Teller effect. The initial discharge capacity of the as-prepared spinel LiMn2−xSixO4 was 147 mA h g −1 over the voltage range of 1.5-4.8 V. However, after 51 cycles, the specific capacity was 88 mA h g −1 with capacity retention of 60 %. More work is needed to understand the effects of substituting Mn 4+ by Si 4+ and to improve the cyclic stability.

show abstract

“…Layered structural materials are convenient for intercalation/deintercalation of metal ions, thus can be used as the appropriate materials for rechargeable ion batteries [1][2][3][4]. Among them, graphite is the key anode material for the commercial lithium ion batteries (LIBs) with an energy capacity of 372 mAhg -1 [5].…”

Section: Introductionmentioning

confidence: 99%

Electric field enhanced adsorption and diffusion of adatoms in MoS2 monolayer

Shi

Wang

et al. 2016

Materials Chemistry and Physics

View full text Add to dashboard Cite

Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) 1 Electric Field Enhanced Adsorption and Diffusion of Adatoms in MoS 2 Monolayer Abstract:A new phenomenon, electric field enhanced adsorption and diffusion of lithium, magnesium and aluminum ions in a MoS 2 monolayer, was investigated using density functional theory in this study. With the electric field increased from 0 to 0.8 V/Å, the adsorption energies of the Li, Mg and Al atoms in the MoS 2 monolayer were decreased from -2.01 to -2.49 eV, from -0.80 to -1.28 eV, and -2.71 to -3.01 eV, respectively. The corresponding diffusion barriers were simultaneously decreased from 0.23 to 0.08 eV, from 0.15 to 0.10 eV, and 0.24 to 0.21 eV for the Li, Mg and Al ions, respectively. We concluded that the external electric field can increase the charging speed of rechargeable ion batteries based on the MoS 2 anode materials.

show abstract

Truncated octahedral LiMn 2 O 4 cathode for high-performance lithium-ion batteries

Cited by 25 publications

References 28 publications

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors

Spinel LiMn2−x Si x O4 (x < 1) through Si4+ substitution as a potential cathode material for lithium-ion batteries

Electric field enhanced adsorption and diffusion of adatoms in MoS2 monolayer

Contact Info

Product

Resources

About

Truncated octahedral LiMn 2 O 4 cathode for high-performance lithium-ion batteries

Cited by 25 publications

References 28 publications

Mesoporous LixMn2O4Thin Film Cathodes for Lithium-Ion Pseudocapacitors

Mesoporous LixMn2O4Thin Film Cathodes for Lithium-Ion Pseudocapacitors

Spinel LiMn2−x Si x O4 (x < 1) through Si4+ substitution as a potential cathode material for lithium-ion batteries

Electric field enhanced adsorption and diffusion of adatoms in MoS2 monolayer

Contact Info

Product

Resources

About

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors

Mesoporous Li_xMn₂O₄Thin Film Cathodes for Lithium-Ion Pseudocapacitors