Method for forming negative electrode material of sodium ion battery

Abstract

The present application provides a method for forming a negative electrode material for a sodium ion battery, comprising: under the condition of ammonia water, carbon nanofibers, surfactants and tetraethyl orthosilicate undergo a sol-gel process to obtain carbon fibers-surfactant-mesoporous Silica composite material; placing the carbon fiber-surfactant-mesoporous silica composite material in excess ammonium nitrate and ethanol solution to obtain a carbon fiber-mesoporous silica composite material; placing the carbon fiber-mesoporous silica composite material The silicon composite material is subjected to a solvent evaporation process to obtain a carbon fiber-nitrogen-sulfur-containing carbon source-mesoporous silica composite material; the silica template inside the carbon fiber-nitrogen-sulfur-containing carbon source-mesoporous silica composite material is removed; filtering and washing to obtain a carbon fiber-nitrogen-sulfur co-doped mesoporous carbon composite material with a coaxial cable structure. The anode materials for sodium ion batteries formed in the examples of the present application have large specific capacity, good rate performance and cycle performance.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for forming a negative electrode material of a sodium ion battery. Background technique [0002] Among many energy storage devices, lithium-ion batteries have rapidly become an important power source for portable electronic devices due to their high energy density and long cycle life. However, for large-scale energy storage, such as electric vehicles and related applications such as power grids, lithium-ion batteries are facing great challenges, mainly because lithium reserves are very limited (only 0.002% in the earth's crust), resulting in lithium-ion battery prices. Expensive, to a large extent restricts the large-scale application of lithium-ion batteries. Therefore, the development of new energy storage technologies for large-scale energy storage has become an urgent need. [0003] Sodium and lithium are the same main group element and have very similar electroc...

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Problems solved by technology

Although graphite has a high lithium storage capacity, its sodium storage capacity is poor. It is generally believed that the interlayer spacing (c.a.0.336nm) of graphite is not suitable for Na+ intercalation.

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