Water-based lithium-sodium ion battery and preparation method and application thereof

Abstract

The invention discloses a water-based lithium-sodium ion battery and a preparation method and application thereof. The battery takes a lithium manganate material as a positive electrode active substance and a carbon composite sodium titanium phosphate material as a negative electrode active substance; a lithium salt, a sodium salt, a zinc salt and urea are dissolved in water to prepare a mixed electrolyte; graphite, carbon nanotubes, polyvinylidene fluoride and a polymer net are compounded to prepare a graphite-based composite film as positive and negative electrode current collectors; a polepiece is prepared by a coating method, a battery cell is prepared by a lamination method, and a battery is assembled by connecting a stainless steel or graphite nut with a tab. The prepared battery has the advantages of long cycle life, high charge-discharge coulombic efficiency, low self-discharge rate, high energy density, low price, high rate capability and wide use temperature range, and can be used as an electric bicycle power battery or an energy storage battery.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to an aqueous lithium-sodium ion battery and a preparation method and application thereof. Background technique [0002] Due to the continuous improvement of electric bicycles' requirements for energy storage devices, different batteries are used as electric bicycle power batteries and energy storage batteries for research. The aqueous lithium-sodium-ion battery has become a very promising candidate for battery materials in this field due to its advantages such as abundant raw material sources, environmental friendliness, safety, and low price. [0003] The traditional lithium-sodium-ion battery is an organic electrolyte battery, which has certain safety hazards. Moreover, due to the strict requirements of the manufacturing process, the cost is relatively high, and recycling is also difficult. The use of aqueous electrolyte can solve the above problems well. In 199...

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Problems solved by technology

[0007] In order to solve the problems of the narrow electrochemical stability window of the electrolyte of the aqueous lithium-sodium ion battery, the current collector corrodes, the electrode active material falls off, the weight of the current collector is large, the cycle life of the battery is attenuated, and the operating temperature range is narrow, the present invention provides an aqueous lithium sodium ion battery. An ion battery and a preparation method thereof, the battery is a lithium-sodium ion battery of a lithium manganese oxide-carbon coated sodium titanium phosphate system, and lithium sulfate, sodium sulfate or zinc sulfate are dissolved in a mixed solvent of water and urea to form a medium-concentration solution as the electrolytic Liquid and hydrothermal method for macro-preparation of highly consistent carbon-composite sodium titanium phosphate as negative electrode material, lithium manganate as positive electrode material, graphite, carbon nanotubes, polyvinylidene fluoride, and polymer network to prepare graphite-based composite film as current collector assembly The prepared battery has the advantages of long cycle life, high charge and discharge coulombic efficiency, low self-discharge rate, high energy density, low price, high rate performance, and wide operating temperature range

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