Stable LATP/LAGP double-layer solid electrolyte prepared via a simple dry-pressing method for solid state lithium ion batteries

Zhao, Erqing; Ma, Feifei; Guo, Yudi; Jin, Yongcheng

doi:10.1039/c6ra19415j

Cited by 95 publications

(60 citation statements)

References 33 publications

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“…[209,210] The SSE coatings can achieve Li + transport across the interface because most of SSE coatings have an allowable Li + ions conductivity. [209,210] The SSE coatings can achieve Li + transport across the interface because most of SSE coatings have an allowable Li + ions conductivity.…”

Section: Interface Engineering To Minimize the Interfacial Resistancementioning

confidence: 99%

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Liu

et al. 2019

Advanced Energy Materials

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The continuous depletion of fossil fuels, the increase of oil prices, and the need to decrease CO 2 emissions have stimulated intensive research on developing alternative renewable and clean energy sources. [1] Among these alternative energy sources, rechargeable Li-ion batteries (LIBs) are one of the promising candidates. To date, the LIBs basically consisting of a positive electrode (cathode), an electrolyte, and a negative electrode (anode) have widespread applications, such as portable electronic devices, pure electric vehicles (PEVs), and hybrid electric vehicles (HEVs). [2] The state-of-the-art electrolytes are usually the lithium salts (LiPF 6 , LiBF 4 , and LiCF 3 SO 3 ) dissolved in organic solvents, i.e., ethylene carbonate, propylene carbonate, polyethylene oxide, and dimethyl carbonate, [3] which exhibit excellent wetting of the electrodes and produce a fast transfer of Li + ions upon charging and discharging. However, they suffer from flammability, poor electrochemical stability, limited temperature range of operation, and low power density. [4] There is an ever-increasing demand for batteries with a higher energy and power density, although current LIBs offer volumetric and gravimetric energy densities up to 770 Wh L −1 and 260 Wh kg −1 , respectively. [5] To improve the energy/power density of LIBs, one way is to adopt high-potential cathode materials such as LiNi 0.5 Mn 1.5 O 4 (LNMO). The high-voltage plateau of LNMO (≈4.7 V vs Li/Li + ) makes its energy density 20-30% higher than the energy density of commercial LiCoO 2 and LiFePO 4 . [6] However, successful commercialization of the LNMO is restricted in high-energy LIBs due to electrolyte decomposition and side reaction of the cathodes and liquid electrolytes when operating at high voltages. [7,8] The other way to improve the energy/power density is to replace the conventional graphite anode with Li metal. The Li metal, with a low anode potential (−3.04 V vs standard hydrogen electrode) and high specific capacity (3862 mAh g −1 for the Li anode versus 372 mAh g −1 for the graphite anode), [9][10][11] has been considered as the "Holy Grail" of battery technologies. When paired with sulfur and oxygen, the theoretical energy density of Li-S (≈2567 Wh kg −1 ) and Li-O 2 (≈3505 Wh kg −1 ) batteries is far higher than the theoretical energy density of conventional LIBs (≈387 Wh kg −1 ). [12][13][14][15] When Li metal approaches the liquid electrolytes, however, unstable Li/electrolyte interface Rechargeable Li-ion batteries (LIBs) are electrochemical storage device widely applied in electric vehicles, mobile electronic devices, etc. However, traditional LIBs containing liquid electrolytes suffer from flammability, poor electrochemical stability, and limited operational temperature range. Replacement of the liquid electrolytes with inorganic solid-state electrolytes (SSEs) would solve this problem. However, several critical issues, such as poor interfacial compatibility, low ionic conductivity at ambient temperatures, etc., need to be surmounted befor...

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Section: Interface Engineering To Minimize the Interfacial Resistancementioning

confidence: 99%

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Liu

et al. 2019

Advanced Energy Materials

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“…[5][6][7] Ceramic-based solid electrolytes are a promising class of materials that enable safer Li metal batteries because they are nonflammable and have a large range of electrochemical stability. [5] Among various ceramic solid electrolytes, [4,[8][9][10][11][12][13][14] sodium super ionic conductor (NASICON)-type oxide electrolytes have been highlighted as promising candidates because they exhibit ionic conductivities near 10 −4 S cm −1 at room temperature and good chemical stability against water and air. [5] Among various ceramic solid electrolytes, [4,[8][9][10][11][12][13][14] sodium super ionic conductor (NASICON)-type oxide electrolytes have been highlighted as promising candidates because they exhibit ionic conductivities near 10 −4 S cm −1 at room temperature and good chemical stability against water and air.…”

mentioning

confidence: 99%

“…[4,8] Furthermore, ceramic electrolytes have Li transference numbers of unity and high elastic moduli compared to polymeric electrolytes, which may be crucial to suppress dendrite growth. [4,8,[11][12][13][14] Nevertheless, sintering of these oxide electrolytes requires high temperature, above 800 °C, to achieve high densities and high ionic conductivities. [4,8,[11][12][13][14] Nevertheless, sintering of these oxide electrolytes requires high temperature, above 800 °C, to achieve high densities and high ionic conductivities.…”

mentioning

confidence: 99%

“…[4,8] Furthermore, ceramic electrolytes have Li transference numbers of unity and high elastic moduli compared to polymeric electrolytes, which may be crucial to suppress dendrite growth. [5] Among various ceramic solid electrolytes, [4,[8][9][10][11][12][13][14] sodium super ionic conductor (NASICON)-type oxide electrolytes have been highlighted as promising candidates because they exhibit ionic conductivities near 10 −4 S cm −1 at room temperature and good chemical stability against water and air. [4,8,[11][12][13][14] Nevertheless, sintering of these oxide electrolytes requires high temperature, above 800 °C, to achieve high densities and high ionic conductivities.…”

mentioning

confidence: 99%

“…[5] Among various ceramic solid electrolytes, [4,[8][9][10][11][12][13][14] sodium super ionic conductor (NASICON)-type oxide electrolytes have been highlighted as promising candidates because they exhibit ionic conductivities near 10 −4 S cm −1 at room temperature and good chemical stability against water and air. [4,8,[11][12][13][14] Nevertheless, sintering of these oxide electrolytes requires high temperature, above 800 °C, to achieve high densities and high ionic conductivities. [9,12,[14][15][16][17] Such a sintering process has obvious limitations, including Li loss, impurity phase formation, incompatibility with organic materials, difficulties in integrating all-solid-state batteries with composite cathodes, and high processing cost.…”

mentioning

confidence: 99%

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Ceramic–Salt Composite Electrolytes from Cold Sintering

Lee

Lyon

Seo

et al. 2019

Adv Funct Materials

102

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The development of solid electrolytes with the combination of high ionic conductivity, electrochemical stability, and resistance to Li dendrites continues to be a challenge. A promising approach is to create inorganic-organic composites, where multiple components provide the needed properties, but the high sintering temperature of materials such as ceramics precludes close integration or co-sintering. Here, new ceramic-salt composite electrolytes that are cold sintered at 130 °C are demonstrated. As a model system, composites of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) or Li 1+x+y Al x Ti 2−x Si y P 3−y O 12 (LATP) with bis(trifluoromethanesulfonyl)imide (LiTFSI) salts are cold sintered. The resulting LAGP-LiTFSI and LATP-LiTFSI composites exhibit high relative densities of about 90% and ionic conductivities in excess of 10 −4 S cm −1 at 20 °C, which are comparable with the values obtained from LAGP and LATP sintered above 800 °C. It is also demonstrated that cold sintered LAGP-LiTFSI is electrochemically stable in Li symmetric cells over 1800 h at 0.2 mAh cm −2 . Cold sintering provides a new approach for bridging the gap in processing temperatures of different materials, thereby enabling high-performance composites for electrochemical systems.

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Progress and Perspectives of Lithium Aluminum Germanium Phosphate‐Based Solid Electrolytes for Lithium Batteries

Zhang

Liu

Xie

et al. 2023

Adv Funct Materials

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Solid‐state lithium batteries are considered promising energy storage devices due to their superior safety and higher energy density than conventional liquid electrolyte‐based batteries. Lithium aluminum germanium phosphate (LAGP), with excellent stability in air and good ionic conductivity, has gained tremendous attention over the past decades. However, the poor interface compatibility with Li anode, slow Li‐ion conduction in thick pellets, and high‐temperature sintering procedure limit the further development of LAGP solid electrolytes in practical applications. This review comprehensively summarizes the crystal structure, Li‐ion conducting mechanism, and various synthesis methods, especially the latest thin‐film preparation approach. The underlying reason for Li/LAGP interfacial instability is identified, followed by several advanced interface engineering strategies, for example, introducing a functional interlayer. The integration design of LAGP‐based solid electrolytes and cathode is also highlighted to enable high‐loading cathodes. Additionally, recent progress of lithium‐oxygen and lithium‐sulfur batteries with LAGP‐based solid electrolytes is discussed. Moreover, the different Li‐ion migration pathways, preparation procedures, and electrochemical performance of polymer‐LAGP composite solid electrolytes in Li‐ion batteries are introduced. Lastly, the remaining challenges and opportunities are proposed to encourage more efforts in this field. This review aims to provide fundamental insights and promising directions toward practical LAGP‐based solid‐state batteries.

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Stable LATP/LAGP double-layer solid electrolyte prepared via a simple dry-pressing method for solid state lithium ion batteries

Abstract: A LATP/LAGP bi-layer structured solid electrolyte has been prepared via a simple dry-pressing and post-calcination process, which exhibits high electrical conductivity and excellent stability in air as well as high chemical stability against Li.

Cited by 95 publications

References 33 publications

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Ceramic–Salt Composite Electrolytes from Cold Sintering

Progress and Perspectives of Lithium Aluminum Germanium Phosphate‐Based Solid Electrolytes for Lithium Batteries

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