Application of Lithium Hydride in Silicon-oxygen（Si-O） Anode Materials for New Energy Lithium Batteries

Our company provides high-precision battery-grade lithium hydride, which is widely used both internationally and domestically. The application of lithium hydride in silicon oxide anode materials mainly focuses on as a pre-lithiation additive, improving the initial coulombic efficiency, the revelation of the lithium ion transport mechanism, and the preparation of metal silicide and sulfide electrode materials, which is of great significance for improving the performance of silicon oxide anode materials.

Pre-lithiation additive:

Lithium hydride can be used as a pre-lithiation additive in Si-O anode materials to improve the first charge/discharge efficiency. Studies have shown that LixSi/Li2O composites are formed by reacting molten Li with SiO or SiO2 through metallurgy, and Li2O-coated LixSi has high room temperature stability due to the Li-O bond being more stable compared to Li-Si, and thus can be used as a highly stable pre-lithiation additive.

Improved initial coulombic efficiency:

Lithium-free metal dehydrogenation-driven prelithiation using lithium hydride can increase the initial coulombic efficiency of Si-O to 90.5%. Lithium released from LiH is the source of the pre-formation of the lithium silicate phase, which is the primary cause of poor initial coulombic efficiency of Si-O. The pre-lithiated Si-O provided a capacity of 1203 mAh g^-1 with an initial coulombic efficiency of 90.5%, without any degradation with other electrochemical properties.

Lithium ion transport mechanism:

The lithium ion transport mechanism of lithium hydride was revealed, indicating the important role of LiH in improving the cycling stability of lithium metal anode.The diffusion energy barrier of Li on the LiH surface is significantly lower than that at the LiMg/LiMg interface, which helps to realize the rapid transport of lithium ions. In addition, the LiH/LiMg interface generates a large amount of built-in electric field, which can further promote the rapid Li transport from the LiH surface to the interior of the LiMg alloy, thus realizing rapid and uniformly stable Li deposition.

Preparation of metal silicide and sulfide electrode materials:

Lithium hydride can be used to prepare metal silicide and sulfide electrode materials. Using alkali metal or alkaline earth metal hydrides instead of metal monomers and reacting with Si and S to prepare metal compounds, a series of metal silicide and sulfide electrode materials have been successfully synthesized at lower temperatures by utilizing the hydrogen-driven effect triggered by the decomposition of the hydrides, and the lithium storage behaviors of the materials have been systematically investigated.

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