Nano Silicon is considered as a promising cathode material for lithium-ion batteries, but silicon itself suffers from a major drawback: bulk expansion, which lead to its short life and poor circulation. Carbon coating and the addition of nano silver conductive agent can make it have better multiplicity and circulation type.The doping of silver nanoparticles can improve the conductivity of nano silicon materials, and is beneficial to the stable deposition of lithium.It is a promising method to solve the problem of lithium anode application.
Metallic silver has been widely studied for its excellent mechanical properties and electrical conductivity in lithium ion battery anode material.
First, the introduction of carbon matrix by the preparation of silicon-silver carbon nano-hybrid materials is not only reduce to the costs of material, but also it helps to the formation of a continuous conductive matrix, to alleviate the expansion of silicon-based anode in the process of circulation.
Second, the preparation of ultra-small silver nanoparticles. Ultra-fine silver nanoparticles is making for the generation of stimulus-induced electric field, so as to enhance the conductivity of carbon matrix.
Third, the preparation of materials with different morphologies, such as silver nanowires, is conducive to the formation of a three-dimensional cross-linked conductive network.
The following tests is quoted from Nature Energy:
We prepared all-solid-state lithium metal batteries with a high Ni NMC cathode, an SSE and a Ag–C nanocomposite layer as the anode with the absence of a Li metal foil. The formation of a dense
Li metal layer, which could be moved repeatedly between the Ag–C nanocomposite layer and the SUS current collector was demonstrated. Ag NPs were alloyed with Li in the early stage of the charging process, but a significant fraction of Ag was found to move to the current collector side and assist the uniform and dendrite-free plating of Li metal. Notably, the Ah class pouch cells exhibited a high energy density (>900Whl−1) and superior cycle life (>1,000 times) which makes this work an important breakthrough in lithium metal battery technology, with potential for future development of EV batteries with a high energy density and safety.
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