Preparation method and preparation mold of all-solid lithium-sulfur battery

Abstract

The invention discloses a preparation method and a preparation mold of an all-solid lithium-sulfur battery. The method of the invention includes the following steps: step a, preparing a solid electrolyte: carrying out high-energy ball milling, high-pressure tabletting and high-temperature sintering on Li2S, P2S5, nano silicon and LiF to prepare a sulfide glass ceramic solid electrolyte; step b, preparing a positive electrode material: carrying out high-temperature heat treatment and multiple times of high-energy ball milling processes on S, active substances and the solid electrolyte preparedin the step a to prepare the positive electrode material; step c, preparing a negative electrode material: carrying out surface treatment on metal lithium sheets to prepare the negative electrode material; and step d, placing the prepared positive electrode material, solid electrolyte and negative electrode material into an all-solid lithium-sulfur battery mold, and adopting a lamination method toprepare the all-solid lithium-sulfur battery. According to the scheme of the invention, the solid electrolyte is used to replace an electrolyte solution, so that a lithium-ion battery is safer, and the solid electrolyte has a good inhibition effect on lithium dendrites, and can also inhibit the shuttle effect and the dissolution of the active substances.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a method for preparing an all-solid-state lithium-sulfur battery and a mold for preparing it. Background technique [0002] With the development of human society, people's demand for energy is increasing day by day, and the fossil energy stored in the earth is becoming increasingly depleted, which poses a challenge to the future development of human society. Therefore, it is imperative to look for alternatives to fossil energy. The emergence of lithium-ion batteries in the 1990s has greatly alleviated the energy crisis. However, traditional lithium-ion batteries still have major defects, and the fatal defect is their liquid The existence of the electrolyte produces lithium dendrites. Lithium dendrites are an important cause of short-circuit failure and electrolyte leakage of lithium-ion batteries, making the batteries flammable and explosive. The well-known Samsung ...

AI Technical Summary

Problems solved by technology

Therefore, it is imperative to look for alternatives to fossil energy. The emergence of lithium-ion batteries in the 1990s has greatly alleviated the energy crisis. However, traditional lithium-ion batteries still have major defects, and the fatal defect is their liquid The existence of the electrolyte produces lithium dendrites. Lithium dendrites are an important cause of short-circuit failure and electrolyte leakage of lithium-ion batteries, making the batteries flammable and explosive. The well-known Samsung note7 incident and the Tesla combustion explosion incident have no One is not caused by the leakage of lithium-ion battery electrolyte; at the same time, people have higher and higher requirements for battery energy density. Battery Energy Density Requirements

Lithium metal has a very high theoretical energy density (3860mAh / g) and the lowest electronegativity, and metal sulfur also has a very high theoretical energy density, so the research on lithium-sulfur batteries has become a research hotspot in the field of new energy. Similarly, Traditional lithium-sulfur batteries have large defects. Due to the generation of polysulfides and their dissolution in the electrolyte, the reversibility of Li+ deposition and deintercalation in the battery is seriously affected, resulting in serious battery capacity attenuation. This effect is called lithium-sulfur batteries. At the same time, due to the long-term contact between the electrolyte and the positive electrode material, the active material is dissolved in the electrolyte, which seriously affects the discharge capacity of the battery.

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