CN-121983659-A - Magnesium lithium silicate doped SPAN polymer material and battery

CN121983659ACN 121983659 ACN121983659 ACN 121983659ACN-121983659-A

Abstract

The invention belongs to the technical field of chemical batteries, and particularly relates to a magnesium lithium silicate doped SPAN polymer material and a battery. According to the invention, the lithium magnesium silicate doped SPAN material is used for preparing the battery anode material, and the sodium ion transfer guide layer is constructed by means of the structural characteristics of the lithium magnesium silicate inorganic filler, so that the effective improvement of the rate performance of the battery is realized. The SPAN material prepared by the method has the advantages of low cost and easy obtainment of raw materials, economic and efficient preparation mode, accords with the concept of green production, and has the potential of easy realization of large-scale production.

Inventors

WANG WEIKUN
XIAO XUEYING
Pei Mengxian
LU JIANHAO

Assignees

中国人民解放军军事科学院防化研究院

Dates

Publication Date: 20260505
Application Date: 20260116

Claims (9)

1. The battery with the SPAN material doped with the magnesium lithium silicate inorganic filler is characterized in that the battery is a lithium metal battery, a lithium ion battery, a sodium ion battery or a sodium metal battery, an active substance in the positive electrode of the battery comprises the magnesium lithium silicate inorganic filler doped SPAN material, and the magnesium lithium silicate inorganic filler doped SPAN material is prepared by the following steps: And (3) taking 0.01-0.05 part by mass of lithium magnesium silicate inorganic filler, 3-8 parts by mass of sulfur powder and 1 part by mass of polyacrylonitrile, uniformly mixing, and firing for 3-8 hours at 300-400 ℃ in an inert atmosphere environment to obtain the lithium magnesium silicate inorganic filler doped SPAN material.
2. The battery of claim 1, wherein the negative electrode of the battery is lithium metal or sodium metal.
3. The lithium magnesium silicate inorganic filler doped SPAN material battery according to claim 1, wherein the separator of the battery is a PP, PE, PP/PE/PP/, PETE or GF separator.
4. The battery with the SPAN material doped with the lithium magnesium silicate inorganic filler according to claim 1, wherein the positive electrode of the battery further comprises acetylene black and polyacrylic acid.
5. The battery with the SPAN material doped with the lithium magnesium silicate inorganic filler according to claim 4, wherein the mass ratio of the lithium magnesium silicate inorganic filler to the SPAN material to the acetylene black in the positive electrode of the battery is 2:1-4:1, and the mass ratio of the acetylene black to the polyacrylic acid is 1:1-3:1.
6. A preparation method of the magnesium lithium silicate inorganic filler doped SPAN material according to any one of claims 1-5 is characterized in that 0.01-0.05 part by mass of magnesium lithium silicate inorganic filler, 3-8 parts by mass of sulfur powder and 1 part by mass of polyacrylonitrile are uniformly mixed, and the mixture is fired in an inert atmosphere environment at 300-400 ℃.
7. The preparation method of the magnesium lithium silicate inorganic filler doped with SPAN material according to claim 6, wherein the preparation method comprises the following specific operations of placing the magnesium lithium silicate inorganic filler, sulfur powder and polyacrylonitrile into a reaction kettle, screwing the reaction kettle in an inert atmosphere environment, and then heating and firing the reaction kettle in a tube furnace.
8. The method for preparing the magnesium lithium silicate inorganic filler doped SPAN material according to claim 6, wherein the inert gas is argon.
9. A lithium magnesium silicate inorganic filler doped SPAN material prepared by the method of any one of claims 6-8.

Description

Magnesium lithium silicate doped SPAN polymer material and battery Technical Field The invention belongs to the technical field of chemical batteries, and particularly relates to a magnesium lithium silicate doped SPAN polymer material and a battery. Background The sulfur-based metal battery is regarded as a next-generation high-energy-density energy storage device with development prospect because of the advantages of high energy density, abundant sulfur reserves, low raw material price, environmental protection and the like. At present, the research of lithium-sulfur batteries has achieved good results, making the research of lithium-sulfur batteries a research hotspot. However, considering the application of large-scale energy storage in the future and the scarcity of lithium resources, the sodium metal with abundant reserves and low cost is more suitable for serving as a negative electrode instead of the lithium metal. Therefore, replacing the high lithium ion battery with the sodium ion battery is becoming one of the focus of research by researchers. Therefore, the combination of the metal sodium (negative electrode) with sulfur (positive electrode) with abundant reserves to construct the sodium-sulfur battery with low cost is of great interest to scientific researchers, and is expected to become a battery energy storage system with the next generation and great application prospect. The Sulfured Polyacrylonitrile (SPAN) is used as a sulfur cathode material with higher theoretical specific capacity and energy density, and solid-solid transformation occurs in the discharging process, so the Sulfured Polyacrylonitrile (SPAN) is also called a lithium sulfur battery with a non-dissolution mechanism, and therefore, the dissolution shuttle effect of polysulfide is not generated. This also makes it a great step in the practical application of sulfur-based metal batteries. However, previous studies have shown that the first-turn irreversible capacity, poor conductivity, slow reaction kinetics, etc. of the vulcanized polyacrylonitrile cathode material are one of the important factors limiting the electrochemical performance thereof, affecting the rate performance and the cycling stability thereof. Disclosure of Invention The invention aims to provide a magnesium lithium silicate doped SPAN polymer material and an application of the material for improving the rate performance of a battery. By introducing magnesium lithium silicate in the preparation process of the positive electrode material SPAN, the multiplying power performance can be effectively improved, the overall performance and the cycle life of the battery can be improved, and a feasible solution is provided for the practical application of the SPAN battery. In order to achieve the technical purpose, the technical scheme of the invention is as follows: In a first aspect, the invention provides a battery with a magnesium lithium silicate inorganic filler doped with a SPAN material, wherein the battery is a lithium metal battery, a lithium ion battery, a sodium ion battery or a sodium metal battery, an active substance in an anode of the battery comprises the magnesium lithium silicate inorganic filler doped with the SPAN material, and the magnesium lithium silicate inorganic filler doped with the SPAN material is prepared by adopting the following method: And (3) taking 0.01-0.05 part by mass of lithium magnesium silicate inorganic filler, 3-8 parts by mass of sulfur powder and 1 part by mass of polyacrylonitrile, uniformly mixing, and firing for 3-8 hours at 300-400 ℃ in an inert atmosphere environment to obtain the lithium magnesium silicate inorganic filler doped SPAN material. Preferably, the negative electrode of the battery is lithium metal or sodium metal. Preferably, the separator of the battery is a PP, PE, PP/PE/PP/, PETE or GF separator. Preferably, the battery positive electrode further comprises acetylene black and polyacrylic acid. Further, in the battery anode, the mass ratio of the lithium magnesium silicate inorganic filler doped with SPAN to the acetylene black is 2:1-4:1, and the mass ratio of the acetylene black to the polyacrylic acid is 1:1-3:1. In a second aspect, the invention provides a preparation method of a magnesium lithium silicate inorganic filler doped SPAN material, which comprises the steps of uniformly mixing 0.01-0.05 part by mass of magnesium lithium silicate inorganic filler, 3-8 parts by mass of sulfur powder and 1 part by mass of polyacrylonitrile, and firing at 300-400 ℃ in an inert atmosphere environment. Preferably, the preparation method comprises the specific operations of placing lithium magnesium silicate inorganic filler, sulfur powder and polyacrylonitrile into a reaction kettle, screwing the reaction kettle in an inert atmosphere environment, and then heating and firing in a tube furnace. Preferably, the inert gas is argon. In a third aspect, the present invention provides a lithium magnesium silicate in