Unraveling the mechanical origin of stable solid electrolyte interphase

Gao, Yao; Du, Xiaoqiong; Hou, Zhen; Shen, Xi; Mai, Yiu‐Wing; Tarascon, Jean‐Marie; Zhang, Biao

doi:10.1016/j.joule.2021.05.015

Cited by 115 publications

(141 citation statements)

References 48 publications

Supporting

Mentioning

135

Contrasting

Order By: Relevance

“…A small force is applied to elastically deform the SEI firstly, and then a large force is used to intentionally break the SEI. [ 22 ] The electrodes are charged/discharged for ten cycles to reach a steady state before AFM tests. For each electrode sample, over 100 test positions are collected.…”

Section: Resultsmentioning

confidence: 99%

“…The ideal SEI would like to have both a large E and a large ε Y , but as the results in Figure 3 show, materials with a larger E tend to have a smaller ε Y , while materials with a larger ε Y tend to be less resistant to deformation. Considering that both E and ε Y have an impact on the stability of SEI, an energy‐based concept, i.e., the maximum elastic deformation energy ( U ∝ E · ε Y 5 , see note S1, Supporting Information, for the derivation), [ 22a ] is adopted here to reflect the mechanical stability of SEI. The higher the value of U , the greater the amount of deformation energy that the SEI can reversibly absorb during the charge/discharge cycle.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

Gao

Hou

Zhou

et al. 2022

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

The mechanical properties of the solid electrolyte interphase (SEI) have attracted increasing attention, but their importance in guiding electrolyte design remains ambiguous. Here it is revealed that, despite a decrease in ionic conductivity for both electrolyte and SEI, exceptional cycling performance of K-metal batteries is achieved in a low concentration carbonate electrolyte by optimizing the mechanical stability of the SEI. The SEI formed in the studied carbonate electrolytes is predominantly organic. Its inorganic content increases with increasing electrolyte concentration and corresponds to an increase in Young's modulus (E) and ionic conductivity of SEI and a decrease in elastic strain limit (ε Y ). The maximum elastic deformation energy combines effects of E and ε Y , achieving a maximum in 0.5 m electrolyte. Finite element simulations indicate that SEI with low either E or ε Y inevitably triggers dendrite growth. These findings foreshadow an increased focus on the mechanical properties of the SEI, where low concentrations of carbonate electrolytes display merit.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

Gao

Hou

Zhou

et al. 2022

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…[ 106 ] Nevertheless, its practical application has been severely hindered by the relatively low ionic conductivity of the electrolyte and high charge transfer resistance between the electrode and solid electrolyte. [ 107 ] To tackle new challenges, the improvement of interfacial ionic conductivity is mainly pursued by various methods. For instance, Mai et al [ 108 ] obtained a solid‐like electrolyte (SLE) based on the combination of the pancake‐like MOF with liquid electrolyte, possessing a high ionic conductivity of 6.60 × 10 −4 S cm −1 and excellent sodium metal compatibility.…”

Section: Other Strategiesmentioning

confidence: 99%

Mainstream Optimization Strategies for Cathode Materials of Sodium‐Ion Batteries

Yao

et al. 2022

Small Structures

115

View full text Add to dashboard Cite

Sodium‐ion batteries are promising candidates for grid‐scale energy storage due to its abundance and similarities to lithium‐ion batteries, whereas the lack of ideal cathode materials limits their practical development. Apart from exploring novel materials, applying optimization strategies on existing potential cathode materials is demonstrated to be effective and efficient in improving their electrochemical properties toward their theoretical best capabilities. Reported strategies include element doping, surface coating, morphology and structure design, defect engineering, etc. Herein, focusing on oxide and polyanionic cathode materials, a comprehensive and systematic review on emerging optimization strategies is provided by discussing representative studies of each. Corresponding fundamental principles, their applicable ranges, and common influences on properties are analyzed. Finally, the perspectives on the current impediments and future directions in the field are presented.

show abstract

“…Furthermore, the K element showed a ∼37% decrease, suggesting a growing content of organic compounds in the SEI over cycling [54]. Although efforts have been made to optimise KPF 6 based electrolytes, low CE prevailed due to the huge volume expansion of graphite and unstable SEI formed due to the presence of both organic and inorganic compounds [55][56][57]. For instance, the SEI layer formed on the surface of carbon using KPF 6 based electrolyte contained K 2 CO 3 , KHCO 3 , RO-COOK and RO-K (figure 1(a)) [27].…”

Section: Sei Regulation With Electrolyte Engineeringmentioning

confidence: 99%

Interphases in the electrodes of potassium ion batteries

et al. 2022

View full text Add to dashboard Cite

Rechargeable potassium-ion batteries (PIBs) are of great interest as a sustainable, environmentally friendly, and cost-effective energy storage technology. The electrochemical performance of a PIB is closely related to the reaction kinetics of active materials, ionic/electronic transport, and the structural/electrochemical stability of cell components. Alongside the great effort devoted in discovering and optimising electrode materials, recent research unambiguously demonstrates the decisive role of the interphases that interconnect adjacent components in a PIB. Knowledge of interphases is currently less comprehensive and satisfactory compared to that of electrode materials, and therefore, understanding the interphases is crucial to facilitate electrode materials design and advance battery performance. The present review aims to summarise the critical interphases that dominate the overall battery performance of PIBs, which includes solid-electrolyte interphase (SEI), cathode-electrolyte interphase (CEI), and solid-solid interphases in composite electrodes, via exploring their formation principles, chemical compositions, and determination of reaction kinetics. State-of-the-art design strategies of robust interphases are discussed and analysed. Finally, perspectives are given to stimulate new ideas and open questions to further the understanding of interphases and the development of PIBs.

show abstract

Unraveling the mechanical origin of stable solid electrolyte interphase

Cited by 115 publications

References 48 publications

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

Critical Roles of Mechanical Properties of Solid Electrolyte Interphase for Potassium Metal Anodes

Mainstream Optimization Strategies for Cathode Materials of Sodium‐Ion Batteries

Interphases in the electrodes of potassium ion batteries

Contact Info

Product

Resources

About