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Standards Development
This international standard establishes a blank detail specification and format for listing the relevant key control characteristics (KCC) including physical, chemical and structural of nanosized silicon anode material.
Numeric values to be specified for the properties and characteristics in this document are intentionally left blank and are determined by agreement between customer and nanosized silicon anode material suppliers. Properties and characteristics deemed by the customer or supplier as not relevant to a specific application shall be classified as “not applicable” or “not specified”.
The theoretical capacity of silicon is 4200 mAh/g, which is ten times higher than graphite. However, it has disadvantages of huge volume expansion and low electronic conductivity, leading to poor cycle performance.Massive efforts have been devoted to solve these problem, including: (1)the control of Si size (for example using nanosize Si materials); (2) combining Si with other materials for example, carbon materials in which carbon can form conductive networks, improving the electrical conductivity and buffering the expansion of Si and so on；(3)Enhancing Interface stability between Si and electrolyte, eg. Using new binder and electrolyte additive.
The method combined Nano-Si and carbon is regarded as one of the most effectively way to release the stress induced by expansion upon lithium alloying and dealloying process, avoiding powdering and fracturing.Nanosized silicon anode material has advantages of high capacity, high safety and abundant raw materials on earth. There are different methods for the preparation of nanosized silicon anode materials in universities, institutes and enterprises. Furthermore, nanosized silicon anode has different morphologies, structures and properties. Subtle differences in the morphology and structure can lead to marked differences in physical, chemical and structural.To gain deeper understanding of properties of nanosized silicon anodematerial, much research is being done in universities, institutes and enterprises around the globe.
Nowadays, Si-C anode materials have been commercialized for several years. The volume expansion of Si has been partially alleviated. Demand for nanosized silicon anode in lithium ion battery is growing rapidly. Therefore, blank detail specification of nanosized silicon anode material with characterization techniques and measurement methods for the properties of nanosized silicon anode material are needed to be standardized.
In this blank detail specification, the key physical, chemical and structural and their measurement methods that will significant influence the performance of nanosized silicon anode material are listed.Characterization techniques and measurement methods for particular properties of nanosized silicon anode material which need to be standardized are organized in a form of a matrix. The matrix could serve as an initial guide for developing the necessary international standards in characterization and measurements of nanosized silicon anode material and related silicon based anode materials.
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