Electrolyte and lithium metal battery

Abstract

The invention provides an electrolyte. The electrolyte comprises modified inorganic oxide particles, a crosslinking agent, a lithium salt and a non-aqueous solvent, wherein the modified inorganic oxide particles and the non-aqueous solvent are combined and gathered together by the crosslinking agent. By the modified inorganic oxide particles, the viscosity of the liquid-state electrolyte can be improved, the mobility of a solution is reduced, the mechanical strength of a semi-solid state is improved, and a semi-solid state or quasi-solid state electrolyte is formed; meanwhile, by a synergisticeffect of the crosslinking agent and the modified inorganic oxide particles, high mechanical modulus blocking is achieved, various dendrites can be prevented from growing, so that lithium dendrites are effectively prevented, the safety of the prepared lithium metal battery is improved, the ion transfer number is increased, and the electrical conductivity is further improved; and an experimental result shows that the safety of the prepared lithium metal battery is relatively high and is not lower than 305h within short time, the electrical conductivity of the prepared lithium metal battery isrelatively high, and the ion transfer number is not lower than 0.25.

Description

Technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to an electrolyte and a lithium metal battery. Background technique [0002] At present, the negative electrode active material of commercial lithium-ion batteries is mainly graphite, but the mass specific capacity of graphite is limited, and the space for increasing volume specific capacity is also very small, which severely limits the weight energy density and volume energy density of lithium-ion batteries. Further improve. With the current development of consumer electronics and electric vehicle technology, the development of a battery system with higher energy density has become an urgent task. [0003] Lithium metal has a very high mass energy density (3860Ah / kg) and volume energy density (2050Ah / L), so it is often used as the negative electrode of lithium metal batteries. However, due to the uneven deposition of lithium metal during repeated charging, the grown lithiu...

AI Technical Summary

Problems solved by technology

However, the above-mentioned effect of suppressing lithium dendrites by adding additives in the electrolyte and by increasing the shear modulus of the solid electrolyte is not satisfactory, and, by adding additives in the electrolyte, it is easy to cause liquid leakage, flammability, and flammability. The safety problem of explosion, the electrical conductivity obtained by increasing the shear modulus of the solid electrolyte is relatively low, the mechanical properties are poor, and the cycle performance and safety performance of the final lithium metal battery are not high.

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