Preparation method of novel all-solid-state lithium ion battery

Abstract

The invention relates to a preparation method of a novel all-solid-state lithium ion battery, belonging to the technical field of lithium ion batteries. The preparation method comprises the steps of:mixing and uniformly dispersing a cathode active substance, a conductive agent and Li3OX as a cathode ingredient; mixing and uniformly dispersing an anode active substance, the conductive agent and Li3OX as an anode ingredient; mixing and uniformly dispersing a main body solid electrolyte and Li3OX as a solid electrolyte layer ingredient; coating the cathode ingredient on a cathode current collector, coating the anode ingredient on the anode current collector, stacking the anode current collector, the anode ingredient, the solid electrolyte layer ingredient, the cathode ingredient and the cathode current collector in order layer by layer to form a solid battery laminated cell, performing sintering of the solid battery laminated cell at a temperature of 282-400 DEG C while applying the pressure to the solid battery laminated cell, packaging the sintered solid battery laminated cell by adopting a battery membrane shell to obtain a novel all-solid-state lithium ion battery. The preparation method is simple, friendly in preparation environment, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a novel all-solid-state lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and environmental friendliness, and are widely used in portable electronic products such as mobile phones and notebook computers and new energy vehicles. However, due to the excessive pursuit of the energy density of batteries, the safety of lithium-ion batteries is facing serious challenges, and accidents of lithium-ion batteries exploding and catching fire frequently occur. [0003] In order to obtain lithium-ion batteries with high energy density and high safety, all-solid-state batteries have entered the stage of lithium-ion batteries. The all-solid-state battery is to replace the electrolyte in the traditional lithium-ion battery with a solid electrolyte, and change the ...

AI Technical Summary

Problems solved by technology

The order of lithium ion conductivity is sulfide (10 -3 -10 -2 S / cm)>Oxide (10 -4 -10 -3 S / cm)>Polymer(10 -8 -10 -5 S / cm), because the polymer is easy to form a thin film and the amorphous sulfide is easy to compress, the two are currently the most widely used, but the polymer is organic, and the sulfide will react when it comes into contact with air. The potential safety hazards are also great. In addition, the electrochemical windows of polymer and sulfide solid electrolytes are narrow, which is not conducive to the application of high-voltage cathode materials.

The oxide solid electrolyte all-solid-state battery has the best safety, wide electrochemical window, and many suitable positive electrode materials. However, the oxide solid electrolyte particles are hard, the temperature for preparing oxide solid electrolyte sheets is high, the conditions are harsh, and the process is cumbersome. , the cost is high, and it is fragile during the battery pressing process, and it will form a huge interface impedance with the positive and negative electrodes. Its application is very limited, so it is difficult to use pure oxide solid electrolytes in battery production. In the technical records, it is often seen in the combined use of oxide inorganic solid electrolytes and polymer solid electrolytes

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