Preparation method and application of high-safety biomass silicon synthesized SiOx@C material

Abstract

The invention provides a preparation method of a high-safety biomass silicon synthesized SiOx@C material. The method comprises the following steps: pickling rice hull ash, carbonizing a proper amountof the rice hull ash in an inert atmosphere, uniformly mixing and ball-milling the carbonized product, metal powder and molten salt, putting the mixture into a furnace, introducing inert gas, carryingout a high-temperature reaction, and pickling to clean byproducts to obtain the product of the SiOx@C material. The method is simple and feasible in process, rich and cheap in raw materials and higher in safety compared with magnesiothermic reduction, and the obtained SiOx@C particles have porous structures, are uniform in carbon coating and good in rate capability and can be applied to the fieldof lithium battery negative electrode materials.

Description

technical field

[0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a high-safety biomass silicon synthesis SiO x Preparation method of @C material. Background technique

[0002] Improving the specific energy of power batteries is the most effective way to solve the "range anxiety" of electric vehicles at this stage. According to authoritative data, lithium-ion power batteries must reach the development goal of 300 W h / kg by 2020. At present, the only feasible technical route is: high-nickel ternary positive electrode material NCM 811, NCA or lithium-rich manganese base with silicon-based negative electrode Material.

[0003] Studies have shown that for every 500 mA h / g increase in the specific capacity of the negative electrode material, the specific energy of the lithium-ion battery can be increased by 15%. The theoretical specific capacity of silicon-based negative electrode materials can reach up to 4200 mA h / g,...

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