Sol–gel preparation of a di-ureasil electrolyte doped with lithium perchlorate

Smith

et al. 2007

Electrochimica Acta

Self Cite

Sol-gel hybrid organic-inorganic networks, doped with a lithium salt, have been used as electrolytes in prototype smart windows. The work described in this presentation is focused on the application of these networks as dual-function electrolyte/adhesive components in solid-state electrochromic devices. The performance of multi-layer electrochromic devices was characterized as a function of the choice of precursor used to prepare the polymer electrolyte component and the guest salt concentration. The prototype devices exhibited good open-circuit memory, coloration efficiency, optical contrast and stability.

Section: Thermal Analysissupporting

confidence: 80%

Section: Thermal Analysismentioning

confidence: 62%

Section: Conductivitymentioning

confidence: 84%

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Studies of solid-state electrochromic devices based on PEO/siliceous hybrids doped with lithium perchlorate

Barbosa

Smith

et al. 2007

Electrochimica Acta

Self Cite

“…It is evident that the presence of the guest salt destabilizes the polymer matrix, however there is apparently no direct relationship between the onset of weight loss and the amount of salt present in the electrolyte. This situation is similar to that observed with electrolytes of other di-ureasil systems [11,12].…”

Section: Thermal Behavior Of Electrolytessupporting

confidence: 75%

Preparation of hybrid organic–inorganic materials based on a di-ureasil matrix doped with lithium bis(trifluoromethanesulfonyl)imide

Barbosa

Rodrigues

Journal of Power Sources

et al. 2008

Self Cite

In this presentation we describe the preparation of solvent-free solid polymer electrolytes (SPEs) by the sol-gel route with the incorporation of controlled quantities of lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) into the host matrix. The host framework of these xerogels, designated as di-ureasils and represented by d-U(900), contains oxyethylene oligomers with about 15 repeat units bonded at each end to a siliceous backbone through urea bridging links. Electrolytes were characterized by ionic conductivity measurements, cyclic voltammetry at a gold microelectrode and thermal analysis. The results obtained reveal that these hybrid materials are completely amorphous and exhibit appropriate electrochemical characteristics for a variety of applications.

“…The potential of di-ureasils for the field of magnetism [16]/biomimetism [17] has become apparent and their suitability as electrolytes for solid state electrochemical devices has also been demonstrated. Di-ureasil networks have been doped with alkali (Li + [18][19][20], Na + [21] and K + [22]), alkaline-earth (Mg 2+ [23]), transition (Zn 2+ [24]) and lanthanide (Eu 3+ [25], Er 3+ [26] and La 3+ [27]) metal ions.…”

Section: Introductionmentioning

confidence: 99%

Structure, thermal properties, conductivity and electrochemical stability of di-urethanesil hybrids doped with LiCF3SO3

Gonçalves

Bermúdez

et al. 2009

Ionics

Variable chain length di-urethane cross-linked poly(oxyethylene) (POE)/siloxane hybrid networks were prepared by application of a sol-gel strategy. These materials, designated as di-urethanesils (represented as dUt(Y′), where Y′ indicates the average molecular weight of the polymer segment), were doped with lithium triflate (LiCF 3 SO 3 ). The two host hybrid matrices used, d-Ut(300) and d-Ut(600), incorporate POE chains with approximately 6 and 13 (OCH 2 CH 2 ) repeat units, respectively. All the samples studied, with compositions ∞ > n≥1 (where n is the molar ratio of (OCH 2 CH 2 ) repeat units per Li + ), are entirely amorphous. The di-urethanesils are thermally stable up to at least 200°C. At room temperature the conductivity maxima of the d-Ut(300)-and d-Ut(600)-based diurethanesil families are located at n=1 (approximately 2.0×10 −6 and 7.4×10 −5 Scm −1 , respectively). At about 100°C, both these samples also exhibit the highest conductivity of the two electrolyte systems (approximately 1.6×10 −4 and 1.0×10 −3 Scm −1 , respectively). The d-Ut (600)-based xerogel with n=1 displays excellent redox stability.