GraphAnode: Bio-Based Graphene coatings for anode materials in Li-ion Battery

Purpose and goal:

The project GraphAnode presents an innovative solution for implementation of the next generation anode composites for LiBs containing silicon nanostructures, conducted by the researchers at RISE and industrial partners Granode Materials. Bio-based binders (nanocellulose, starch) in combination with sustainable synthesized graphene, creates a synergic conductive network structure that promises to contain the excessive mechanical hysteresis of the silicon-based anodes which ultimately delivers higher energy densities over several cycles of lithiation

Expected results and effects:

Introduction of novel active material based on expanded graphite decorated with nanosilicon coated with graphene has led to the increased electrochemical performances in comparison to reference expanded graphite. Remarkably, this improvement was reached together with improved sustainability of the LiB anodes. The bio-based binders such as starch and nanocellulose (CNC and CNF) were used in the formulation of anode instead of commonly used styrene-butadiene rubber.

These results are important for the development of next generation anode and improved battery sustainability. Approach and implementation:

The next generation anode formulations were prepared using novel active materials, e.g. expanded graphite decorated with nanosilicon coated with graphene, bio-based binders, e.g. starch and nanocellulose and a conductive additive, e.g. graphene. The anode formulations were developed at RISE. The novel active material was developed at Granode Materials AB.

The electrochemical test was carried out using deposited anode and lithium foil counter electrodes in coin half-cells configurations. Galvanostatic charge discharge cycle tests were carried out versus lithium electrode.