The solid–liquid equilibrium
(SLE) of electrolyte mixtures
Li+, K+, Rb+//borate–H2O at T = 323 K was studied by the isothermal
dissolution method, and the X-ray diffraction method was used to confirm
the solid-phase compositions. The analysis of phase diagram shows
that the graph consists of one three-salt cosaturation invariant point
and three regions of crystallization corresponding to single salts
Li2B4O7·3H2O, K2B4O7·4H2O, and RbB5O8·4H2O, respectively. From the
comparison of phase diagrams of system Li+, K+, Rb+//B4O7
2––H2O between 323 and 348 K, we can conclude that (1) the crystalline
form of salts lithium borate, potassium borate, and rubidium borate
did not change at 323 and 348 K and (2) the salt Li2B4O7·3H2O crystalline area decreases
and the other two salt crystalline areas, K2B4O7·4H2O and RbB5O8·4H2O, increase at 323 K.
Transition metal phosphides (TMPs) are perplexed by the low electronic/ionic conductivity, volume variations, and unstable reaction interfaces. To tackle these issues, herein, we have proposed a low‐temperature phosphorization strategy by reactions between Co‐based metal‐organic frameworks (MOF) and sodium dihydric hypophosphite to encapsulate monodisperse CoP nanoparticle (∼12 nm) into MOF‐derived hollow and porous carbon nanobox (CoP@PCB). Compared to bare CoP, such CoP@PCB electrode has shown remarkable electrochemical performance, which is highly ascribed to its robust structural feature, pre‐reserved voids, monodisperse CoP nanoparticles, and stable reaction interfaces, as well as fast reaction kinetics. Moreover, the good electrochemical properties of CoP@PCB//LiFePO4 full cells have demonstrated practical possibility. The formation of Co and Li3P as discharged products has corroborated the redox conversion reaction mechanism, as assessed by in‐situ X‐ray diffractions. The favorable function of the carbon shell in boosting both electronic conductivity and lowering diffusion energy barriers has been confirmed by theoretical calculations, demonstrating an important synergistic effect.
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