Preparation method and application of ferrous hexafluorosilicate and iron-silicon composite material

• Main Authors: SUN JICHANG, ZHENG YUN, RAN YIFENG, LIU ZHIHONG
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a preparation method and application of a ferrous hexafluorosilicate and ferro-silicon composite material, hydrofluoric acid and ferro-silicon alloy are adopted to prepare ferrous hexafluorosilicate in one step, the key point is that the content of the hydrofluoric acid and the weight of the ferro-silicon alloy are controlled, a certain proportion is regulated and controlled to enable the ferro-silicon alloy to be balanced, and although the hydrofluoric acid is relatively high in toxicity, the ferro-silicon alloy cannot be damaged. However, according to the method, a very good effect can be achieved by only using a very small amount of hydrofluoric acid, and environmental pollution can be reduced to the minimum by adopting an excessive ferrosilicon alloy mode, so that the method is relatively environment-friendly. When the prepared ferrous hexafluorosilicate is used as the negative electrode material of the lithium ion battery, the formation of irreversible lithium fluosilicate can be