Stack Pressure Measurements to Probe the Evolution of the Lithium–Solid-State Electrolyte Interface

Lee, Chanhee; Han, Sang Yun; Lewis, John A.; Shetty, Pralav P.; Yeh, David; Liu, Yuhgene; Klein, Emily J.; Lee, Hyun‐Wook; McDowell, Matthew T.

doi:10.1021/acsenergylett.1c01395

Cited by 93 publications

(76 citation statements)

References 40 publications

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“…The possible reason could be that the excessive stress created on electrode|electrolyte contact in a bent position helped achieve a better contact. This agrees with some other reports where pressure has been an important parameter to enhance solid-solid interface contact between Li and SSEs [83][84][85]. Wen et al also observed improvements in tensile properties and enhanced flexibility by adding 1 wt% GO to a polymer electrolyte [59].…”

Section: Go Role In Flexible Thin Film Batterysupporting

confidence: 90%

Graphene in Solid-State Batteries: An Overview

2022

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Solid-state batteries (SSBs) have emerged as a potential alternative to conventional Li-ion batteries (LIBs) since they are safer and offer higher energy density. Despite the hype, SSBs are yet to surpass their liquid counterparts in terms of electrochemical performance. This is mainly due to challenges at both the materials and cell integration levels. Various strategies have been devised to address the issue of SSBs. In this review, we have explored the role of graphene-based materials (GBM) in enhancing the electrochemical performance of SSBs. We have covered each individual component of an SSB (electrolyte, cathode, anode, and interface) and highlighted the approaches using GBMs to achieve stable and better performance. The recent literature shows that GBMs impart stability to SSBs by improving Li+ ion kinetics in the electrodes, electrolyte and at the interfaces. Furthermore, they improve the mechanical and thermal properties of the polymer and ceramic solid-state electrolytes (SSEs). Overall, the enhancements endowed by GBMs will address the challenges that are stunting the proliferation of SSBs.

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Section: Go Role In Flexible Thin Film Batterysupporting

confidence: 90%

Graphene in Solid-State Batteries: An Overview

2022

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“…Argyrodite type lithium phosphorus sulfide chloride (LPSCl), for example, is kinetically stable with Li metal by the SEI mainly composed of Li 2 S, Li 3 P, and LiCl, despite the narrow EW of 1.71‐2.01 V. [ 18 ] This interphase is kinetically stabilized by the ionic conducting Li 2 S and the electronic insulating Li 3 P and LiCl can ensure self‐limited reaction to avoid by‐products among the interphases. [ 84 ] But Li dendrite ingress in LPSCl still occurs. While the kinetically unstable interphase contains components with high electron conductivity, Li + is driven to form compounds but not to plate.…”

Section: Application and Design Strategies Of Hsementioning

confidence: 99%

Vertically Heterostructured Solid Electrolytes for Lithium Metal Batteries

Tang

et al. 2022

Adv Funct Materials

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Solid‐state electrolytes (SSEs) have been regarded as the most attractive candidate for safe and high‐energy lithium (Li) batteries of the next generation. However, the inability of current SSEs to keep up with the performance requirements of batteries is significantly affected by complex factors, especially ionic conductivity, mechanochemical properties, and coupled ion/electron reaction at the electrified interfaces. Strategies in solid electrolyte chemistries and technologies are put forward to overcome these challenges while widening the breadth of possible applications. Among them, vertically heterostructured solid‐state electrolytes (HSE) are constructed as a most promising strategy, which can take advantage of individual SSE layers together and rationalize the stability and compatibility of electrodes. This review comprehensively summarizes the specific features of the HSE based on the current knowledge of SSE failure modes. Additionally, a detailed review of the recent progress on the HSE design in terms of organic polymer electrolytes and inorganic electrolytes is generated. Finally, the advantages and drawbacks of the design strategies are discussed. New perspectives about HSE are proposed as well.

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“…SSBs in this study used custom cell housings that were calibrated to apply known amounts of stack pressure by controlling the torque applied to the cell bolts, as based on previous studies 21,40,41 . Anode-free half cells were assembled in an Ar-filled glovebox by first loading 90 mg of ground LPSC into a 10 mm PEEK die and cold pressing in a uniaxial press at 375 MPa for 1 min to form a dense pellet.…”

Section: Assembly and Testing Of Solid-state Batteriesmentioning

confidence: 99%

Accelerated Short Circuiting in Anode-Free Solid-State Batteries Driven by Local Lithium Depletion

Lewis

Sandoval

Liu

et al. 2022

Preprint

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“Anode-free” solid-state batteries (SSBs), which have no active material at the anode and undergo in situ lithium plating during the first charge, can exhibit extremely high energy density (~1500 Wh L-1). However, there is a lack of understanding of lithium plating/stripping mechanisms at bare solid-state electrolyte (SSE) interfaces since excess lithium is often used. Here, we demonstrate that commercially relevant quantities of lithium (> 5 mAh cm-2) can be reliably plated at relatively high current densities (1 mA cm-2) using the sulfide SSE Li6PS5Cl. Investigations of lithium plating/stripping mechanisms, in conjunction with cryo-focused ion beam (FIB) and ex situ synchrotron tomography, reveal that the cycling stability of these cells is intrinsically limited by spatially uneven plating/stripping. Local lithium depletion toward the end of stripping decreases electrochemically active area, which results in high local current densities and void formation, accelerating subsequent filament growth and short circuiting compared to lithium-excess cells. Despite this governing degradation mode, we show that anode-free cells exhibit comparable Coulombic efficiencies to lithium-excess cells before short circuiting, and improved resistance to short-circuiting is achieved by avoiding local lithium depletion through retention of lithium at the interface. These new insights provide a foundation for engineering future high-energy anode-free SSBs.

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Stack Pressure Measurements to Probe the Evolution of the Lithium–Solid-State Electrolyte Interface

Cited by 93 publications

References 40 publications

Graphene in Solid-State Batteries: An Overview

Graphene in Solid-State Batteries: An Overview

Vertically Heterostructured Solid Electrolytes for Lithium Metal Batteries

Accelerated Short Circuiting in Anode-Free Solid-State Batteries Driven by Local Lithium Depletion

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