Sol–gel synthesis and characterization of Li2CO3–Al2O3 composite solid electrolytes

Impact of the Local Environment on Li Ion Transport in Inorganic Components of Solid Electrolyte Interphases

“…The rate-limiting step of Li ion diffusion in the SEI is believed to be the Li ion migration in the inorganic inner layer, where Li 2 CO 3 and LiF are two major inorganic components. ,− Although previous studies demonstrated that the Coulombic efficiency can be significantly improved by regulating the SEI structure with abundant Li 2 CO 3 and LiF, ,, the role of the different components for the Li ionic conductivity is still under debate. Some earlier theoretical studies focused on the crystalline phase of these materials. ,,− However, recent studies show that these components are more likely to exist in an amorphous form in the SEI, especially at the grain boundaries. , In addition, the amorphous layer has been observed on the cathode surface. , Therefore, it is significant to employ the amorphous Li 2 CO 3 and LiF structures as the modeling systems for an in-depth understanding of the SEI properties.…”

Structural, Mechanical, and Dynamical Properties of Amorphous Li2CO3 from Molecular Dynamics Simulations

“…For example, glassy amorphous films of Li 2 CO 3 -Li 3 BO 3 formed by atomic layer deposition showed great potential as solid electrolytes demonstrating ionic conductivity on the order of 10 −6 S/cm [16]. Sulaiman et al [17] used sol-gel synthesis to fabricate Li 2 CO 3 -Al 2 O 3 composite solid electrolytes in which substantial fraction of Li 2 CO 3 was found to be in the amorphous glassy phase, even when the Li 2 CO 3 comprised the majority of the composite.…”

“…Moreover, as was demonstrated in recent works on solid electrolytes, glassy amorphous Li 2 CO 3 with high ionic conductivity can be stabilized by adding relatively small fractions of other oxides and using atomic layer deposition or sol-gel synthesis. [17] In this paper, by using classical atomistic molecular dynamics (MD) simulations and a polarizable force field, we specifically focus on the properties of amorphous Li 2 CO 3 phase and predict structural, dynamical, and mechanical properties of Li 2 CO 3 as a function of temperature.…”

Study of the influence of nanosized oxides MgO, Al2O3 and SiO2 on phase transitions in LiNO3–KNO3 using the DSC method

“…В нанокомпозитах структура, фазовый состав и термодинамические характеристики ионной соли, находящейся в области межфазного контакта с наночастицей, могут значительно изменяться. Так, в ряде работ установлено, что гетерофазное допирование приводит к образованию аморфных высокопроводящих фаз солей на границе раздела компонентов соль-наноразмерный оксид [2][3][4][5][6]. В некоторых случаях добавка наноразмерного оксида приводит к образованию в композите новых кристаллических фаз солевой подсистемы нанокомпозита [7,8].…”

“…Наиболее отчетливо процессы, связанные с разупорядочением и структурными изменениями, наблюдаются при фазовых переходах солевой подсистемы композита. Таким образом, исследуя термодинамику фазовых переходов в нанокомпозитах, можно извлечь информацию о разупорядоченности ионной соли в нанокомпозите, что приводит, как правило, к увеличению ионной проводимости на несколько порядков [2][3][4][5][6][7][8][9][10][11].…”