How to improve the electrochemical performance of nano-silicon anode materials

What can you do to improve the electrochemical performance for nano-silicon-based anode materials?

Countries around the globe attach great importance to the strategic direction of research that is focused on the development and applying new energy. The battery’s performance is critical for the growth of the new energy industry. There are numerous kinds of batteries that can be utilized to store energy. The most significant research area is lithium-ion battery, which can be utilized to power batteries and as energy storage batteries. There are many applications. It is important to know the efficacy, cycle retention rates, capacity, and rate of lithium-ion battery cells.

Lithium-ion battery components include positive electrodes, negative electrodes, electrolytes, separators and other components. The creation of positive or negative materials is inextricably linked to the improvement of efficiency of lithium-ion batteries. There are three kinds of cathode materials, including lithium iron phosphate and lithium cobalt dioxide. Their cycling capacity is less than 200mAh/g. Anode materials include graphite and silicon-carbon materials. They also come with different rates of cycling. The capacity is typically less than 420mAh/g. further increasing the specific power of anode materials is an important area of research widely recognized. The theoretical capacity of nano-silicon can be as high as 4200mAh/g. The low efficiency of its primary function and poor retention of the cycle are two of the main reasons for why it isn’t widely utilized.

The following methods are utilized mostly to improve the electrochemical properties and performance of silicon-based materials for anodes:

(1) Nano silicon materials:

Nanometerization in the zero-dimension may limit the absolute volume change in silicon. Nanometerization in one dimension reduces change in volume radially during charging and decharging. Two-dimensional nanometerization can reduce the change in volume perpendicular to the film.

(2) Silicon alloy materials:

One of them is inert metals (Cu Fe, Mn and Ti, etc.). They do not react with Li+. The conductivity of the inert phase of the metal is high and it accelerates Li+’s diffusion. It also serves as a buffer matrix. The other type can react with lithium. The active metals (Al. Mg. Sn. Sb. and so on.) of the deintercalation reaction, the lithium-intercalation potential platforms of the active metals and silicon are quite different, and the lithium compound generated by the active metal intercalation can be used as a buffer matrix.

(3) Silicon carbon anode material:

Nano Silicon anode material gives full play to the excellent electrical conductivity and good durability of carbon-based materials. The low cycle retention rate for nano silicon anode material has been a major problem that hinders its use. The cycle retention rate of nano silicon anode materials could be enhanced by coating silicon particles with carbon or converting some silicon to silicon carbide. The current use of silicon-carbon anode compounds shows that silicon-based anode materials should be utilized with graphite anodes, and the proportion of silicon anode materials should generally not exceed 15 percentage.

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