The synthesis, structure and properties of a new lithium-rich manganese(ii) phosphate Li5CsMn(P2O7)2: a congruently melting compound with a ‘lithium hamburger’ structure

AbstractLithium aluminum titanium phosphate (LATP) is known to have a high Li-ion conductivity and is therefore a potential candidate as a solid electrolyte. Via sol-gel route, it is already possible to prepare the material at laboratory scale in high purity and with a maximum Li-ion conductivity in the order of 1·10−3 s/cm at room temperature. However, for potential use in a commercial, battery-cell upscaling of the synthesis is required. As a first step towards this goal, we investigated whether the sol-gel route is tolerant against possible deviations in the concentration of the precursors. In order to establish a possible process window for sintering, the temperature interval from 800 °C to 1100 °C and holding times of 10 to 480 min were evaluated. The resulting phase compositions and crystal structures were examined by X-ray diffraction. Impedance spectroscopy was performed to determine the electrical properties. The microstructure of sintered pellets was analyzed by scanning electron microscopy and correlated to both density and ionic conductivity. It is shown that the initial concentration of the precursors strongly influences the formation of secondary phases like AlPO4 and LiTiOPO4, which in turn have an influence on ionic conductivity, densification behavior, and microstructure evolution.

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Unveiling the presence of mixed oxidation states of Europium in Li 7+δ Eu x La 3‐δ Zr 2‐δ O 12‐δ garnet and its impact on the Li‐ion conductivity

Journal of the American Ceramic Society ◽

10.1111/jace.17846 ◽

2021 ◽

Author(s):

Hamed Salimkhani ◽

Emre Erdem ◽

Selmiye Alkan Gursel ◽

Alp Yurum

Keyword(s):

Ion Conductivity ◽

Oxidation States ◽

Mixed Oxidation ◽

Li Ion

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Li2(BH4)(NH2) Nanoconfined in SBA-15 as Solid-State Electrolyte for Lithium Batteries

Nanomaterials ◽

10.3390/nano11040946 ◽

2021 ◽

Vol 11 (4) ◽

pp. 946

Author(s):

Qianyi Yang ◽

Fuqiang Lu ◽

Yulin Liu ◽

Yijie Zhang ◽

Xiujuan Wang ◽

...

Keyword(s):

Solid State ◽

High Performance ◽

Coulombic Efficiency ◽

Specific Capacity ◽

Transference Number ◽

Electrochemical Stability ◽

Ion Conductivity ◽

Solid State Batteries ◽

Li Ion ◽

Conduction Properties

Solid electrolytes with high Li-ion conductivity and electrochemical stability are very important for developing high-performance all-solid-state batteries. In this work, Li2(BH4)(NH2) is nanoconfined in the mesoporous silica molecule sieve (SBA-15) using a melting–infiltration approach. This electrolyte exhibits excellent Li-ion conduction properties, achieving a Li-ion conductivity of 5.0 × 10−3 S cm−1 at 55 °C, an electrochemical stability window of 0 to 3.2 V and a Li-ion transference number of 0.97. In addition, this electrolyte can enable the stable cycling of Li|Li2(BH4)(NH2)@SBA-15|TiS2 cells, which exhibit a reversible specific capacity of 150 mAh g−1 with a Coulombic efficiency of 96% after 55 cycles.

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Improved lithium manganese oxide spinel/graphite Li-ion cells for high-power applications

Journal of Power Sources ◽

10.1016/j.jpowsour.2003.11.007 ◽

2004 ◽

Vol 129 (1) ◽

pp. 14-19 ◽

Cited By ~ 209

Author(s):

K Amine ◽

J Liu ◽

S Kang ◽

I Belharouak ◽

Y Hyung ◽

...

Keyword(s):

Manganese Oxide ◽

High Power ◽

Lithium Manganese Oxide ◽

Lithium Manganese ◽

Oxide Spinel ◽

Lithium Manganese Oxide Spinel ◽

Li Ion

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Relevance between the Bulk Density and Li+-Ion Conductivity in a Porous Electrolyte: The Case of Li[Li1/3Ti5/3]O4

ACS Applied Materials & Interfaces ◽

10.1021/acsami.5b05952 ◽

2015 ◽

Vol 7 (36) ◽

pp. 20314-20321 ◽

Cited By ~ 3

Author(s):

Kazuhiko Mukai ◽

Naoyoshi Nunotani ◽

Ryuta Moriyasu

Keyword(s):

Bulk Density ◽

Ion Conductivity ◽

Li Ion

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Probing the Effect of High Energy Ball Milling on the Structure and Properties of LiNi1/3Mn1/3Co1/3O2 Cathodes for Li-Ion Batteries

Journal of Electrochemical Energy Conversion and Storage ◽

10.1115/1.4034755 ◽

2016 ◽

Vol 13 (3) ◽

Cited By ~ 5

Author(s):

Malcolm Stein ◽

Chien-Fan Chen ◽

Matthew Mullings ◽

David Jaime ◽

Audrey Zaleski ◽

...

Keyword(s):

Particle Size ◽

Electrochemical Performance ◽

Crystallite Size ◽

Ball Milling ◽

Lithium Ion ◽

High Energy ◽

Li Ion Batteries ◽

Structure And Properties ◽

Transfer Resistance ◽

Li Ion

Particle size plays an important role in the electrochemical performance of cathodes for lithium-ion (Li-ion) batteries. High energy planetary ball milling of LiNi1/3Mn1/3Co1/3O2 (NMC) cathode materials was investigated as a route to reduce the particle size and improve the electrochemical performance. The effect of ball milling times, milling speeds, and composition on the structure and properties of NMC cathodes was determined. X-ray diffraction analysis showed that ball milling decreased primary particle (crystallite) size by up to 29%, and the crystallite size was correlated with the milling time and milling speed. Using relatively mild milling conditions that provided an intermediate crystallite size, cathodes with higher capacities, improved rate capabilities, and improved capacity retention were obtained within 14 μm-thick electrode configurations. High milling speeds and long milling times not only resulted in smaller crystallite sizes but also lowered electrochemical performance. Beyond reduction in crystallite size, ball milling was found to increase the interfacial charge transfer resistance, lower the electrical conductivity, and produce aggregates that influenced performance. Computations support that electrolyte diffusivity within the cathode and film thickness play a significant role in the electrode performance. This study shows that cathodes with improved performance are obtained through use of mild ball milling conditions and appropriately designed electrodes that optimize the multiple transport phenomena involved in electrochemical charge storage materials.

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