Cold sintering process for fabrication of a high volumetric capacity Li4Ti5O12 anode

Seo, Joo Hwan; Verlinde, Kris; Rajagopalan, Ramakrishnan; Gomez, Enrique D.; Mallouk, Thomas E.; Randall, Clive A.

doi:10.1016/j.mseb.2019.114435

Cited by 14 publications

(12 citation statements)

References 53 publications

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“…By increasing the current density from 0.1 to 4.0 A g −1 , no obvious plateaus are observed in these curves, indicating the excellent rate capability. The specific capacity is 627, 512, 433, 371, 309, and 244 mA h g −1 at current densities of 0.1, 0.2, 0.5, 1.0, 2.0, and 4.0 A g −1 , corresponding to volumetric specific capacity of 934, 763, 645, 553, 460, and 363 mA h cm −3 , respectively, superior to other results reported elsewhere (Table S1) [36][37][38][39][40][41][42][43][44][45]. Then, the rate performance of the VM POMs/MXenes is shown in Fig.…”

Section: Resultscontrasting

confidence: 54%

MXene-mediated regulation of local electric field surrounding polyoxometalate nanoparticles for improved lithium storage

Chao

et al. 2022

Sci. China Mater.

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Due to their capability of reversibly accepting multi lithium ions, polyoxometalates (POMs) have been widely regarded as promising candidates for electrochemical lithium storage. Nevertheless, the insulating nature of POMs hinders fast migration kinetics of lithium within the bulk of these materials. Herein, we propose the introduction of a local electric field surrounding the POM nanoparticles consisting of Mn and V where the concomitant Coulomb forces can accelerate the migration of lithium ions. After rationally hybridizing POMs with MXene nanosheets, the imbalanced charge distribution emerging at their interface produces the local electric field, thereby leading to a 250-fold increase of lithium diffusion coefficient. In this regard, a capacitive contribution as high as 81.7% at 1.0 mV s −1 is observed. Moreover, the POM nanoparticles could densely assemble on the surface of MXene nanosheets, offering highly packed electrodes and thus high volumetric capacities. Due to the improved lithiumion transfer kinetics, the POMs/MXenes composites are paired with activated carbon to produce lithium-ion capacitors which could offer a high energy density of 195.5 W h kg −1 and a large power capability of 3800 W kg −1 . The findings in this work could build a clear relationship between materials with different conductivities for designing electrode materials.

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Section: Resultscontrasting

confidence: 54%

MXene-mediated regulation of local electric field surrounding polyoxometalate nanoparticles for improved lithium storage

Chao

et al. 2022

Sci. China Mater.

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“…[36] Considering the low density of hot-pressed ceramic composites usually in the rage of 60 ~ 65 %, the higher densities of the cold sintered composites suggest that the LLZO-SM composite could be well densified using CSP with ACN and/or DMF. [33] [36] [34] The Nyquist plot of the cold sintered composites with and without DMF was shown in Fig. 4a.…”

Section: Resultsmentioning

confidence: 99%

“…An important opportunity for this cold sintering approach is the all solid-state battery. Recently, for different components, cathodes based on LiFePO4 (LFP) and anodes based on MoS2 and Li4Ti5O12 (LTO) have all been developed by cold sintering and have shown high volumetric efficiency [30]- [33]. In regard to solid-state electrolytes, we have shown the LiMe2(PO4)3 NASICON family with Me= Al, Ge and Ti; specially compositions Li1.5Al0.5Ge1.5(PO4)3 (LAGP) and Li1.4Al0.4Ti1.6(PO4)3 (LATP)-based materials can be cold sintered with high densities at low temperatures [34]- [36].…”

Section: Introductionmentioning

confidence: 99%

Broad temperature dependence, high conductivity, and structure-property relations of cold sintering of LLZO-based composite electrolytes

Seo

Nakaya

Takeuchi

et al. 2020

Journal of the European Ceramic Society

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“…In its usual form, cold sintering is characterized by the wetting of a powder followed by uniaxial pressing inside a heated die above the boiling temperature of the wetting solvent (typically aqueous). , In this manner, we have successfully applied cold sintering to the cathodes (MoS 2 , V 2 O 5 , and LiFePO 4 , ), an anode (Li 4 Ti 5 O 12 ), and a NASICON-type solid-state electrolyte (Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 ) for lithium-ion batteries, primarily with low-temperature aqueous solvents. In densifying the Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 electrolyte, however, we needed to introduce a conductive salt additive to improve the conductivity to high values (>10 –4 S/cm).…”

Section: Introductionmentioning

confidence: 99%

Densification of a Solid-State NASICON Sodium-Ion Electrolyte Below 400 °C by Cold Sintering With a Fused Hydroxide Solvent

Grady

Tsuji

Ndayishimiye

et al. 2020

ACS Appl. Energy Mater.

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A modified cold sintering process is described, which permits the densification of the prototypical sodium-ion electrolyte, Na 3 Zr 2 Si 2 PO 12 , to greater than 90% relative density at a process temperature below 400 °C. The roomtemperature grain boundary ionic conductivity is greater than 2 × 10 −4 S/cm. Sintering of Na 3 Zr 2 Si 2 PO 12 to such densities and conductivities typically requires sintering near 1200 °C for many hours. We modify the cold sintering process by replacing the aqueous transient solvent with a fused hydroxide (NaOH, T m = 312 °C) to increase the reactivity of the solvent−particle interaction while also retaining the increased driving forces for densification characteristic of cold sintering, namely, the transient nature of the solvent and uniaxial pressure applied to an open system. We demonstrate the changes in phase purity, conductivity, and density by varying the process temperature, weight fraction hydroxide, and dwell time. The best results are obtained near 375 °C, 10 w/w NaOH, and 3 h of sintering.

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Cold sintering process for fabrication of a high volumetric capacity Li4Ti5O12 anode

Cited by 14 publications

References 53 publications

MXene-mediated regulation of local electric field surrounding polyoxometalate nanoparticles for improved lithium storage

MXene-mediated regulation of local electric field surrounding polyoxometalate nanoparticles for improved lithium storage

Broad temperature dependence, high conductivity, and structure-property relations of cold sintering of LLZO-based composite electrolytes

Densification of a Solid-State NASICON Sodium-Ion Electrolyte Below 400 °C by Cold Sintering With a Fused Hydroxide Solvent

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