All-solid-state battery with self-heating function, and preparation method thereof

Abstract

The invention provides an all-solid-state battery with a self-heating function, and a preparation method thereof. A nickel net is coated with an electrolyte slurry, a composite electrolyte layer is obtained after drying, and then a positive plate, a negative plate and the composite electrolyte layer are laminated, hot-pressed and packaged to prepare the all-solid-state battery. According to the all-solid-state battery, the metal Ni net is used for directly heating the solid electrolyte, the heat transfer path is shorter, the battery cell can be heated more uniformly, and the heating rate is higher. The metal Ni in the composite electrolyte is of a net-shaped structure, and transmission of lithium ions cannot be blocked. Meanwhile, according to the preparation method disclosed by the invention, the temperature of the solid electrolyte can be effectively controlled by heating the electrolyte, and the problem of low conductivity of the solid electrolyte at low temperature or room temperature is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to an all-solid-state battery with a self-heating function and a preparation method thereof. Background technique [0002] With the country's strong support for the new energy vehicle industry, electric vehicle technology, especially municipal power lithium battery technology, has made great technological progress, and the cruising range of electric vehicles has continued to increase, from the original 300 kilometers to the current 500,600 km, even 800 km. For single cells, the liquid electrolyte system is generally used at present, and the energy density can reach 260-300Wh / kg, but it has basically reached the limit of the theoretical energy density. At the same time, the traditional liquid lithium-ion battery system uses a flammable liquid electrolyte, which has potential safety hazards. Moreover, the electrochemical reaction kinetics is slow at low temperatures, and it...

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Problems solved by technology

However, the self-heating lithium battery Ni sheet prepared by this method is sandwiched between the single-sided negative electrode sheets of the negative electrode, and the heat generated can only be diffused to the entire battery cell in the form of thermal diffusion, and the temperature rise is relatively slow. At the same time, the heating element metal Ni It is placed inside the cell in the form of a solid sheet, which is not conducive to the improvement of the energy density of the cell

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