Lithium intercalation drives remarkable mechanical properties deterioration in bulk and single-layered phosphorus: A first-principles study

TL;DR

This study uses first-principles calculations to show that lithium intercalation significantly weakens the mechanical properties of phosphorus, impacting the safety and reliability of Li-ion batteries.

Contribution

It provides new insights into how lithium intercalation affects the mechanical integrity of phosphorus, a key electrode material, through detailed computational analysis.

Findings

Young's modulus decreases with lithium intercalation

Mechanical bearing capacities are reduced by several times

Mechanical deterioration impacts battery safety and reliability

Abstract

It is of critical importance to understand the mechanical properties change of electrode materials during lithium intercalation in the mechanical design of Li-ion batteries, for the purpose of the high reliability and safety in their applications. Here, we investigated the mechanical properties of both bulk and single layer phosphorus during the lithium intercalation process by using the first-principles calculations. Our results show that the Young's modulus of bulk and layered phosphorus strongly depends on the lithium intercalation. The mechanical bearing capacities, such as critical strain and stress, are significantly reduced by several times after lithium intercalation in both bulk and single layer phosphorus, which may reduce the reliability of Li-ion batteries. Our findings suggest that this remarkable mechanical properties deterioration during Li intercalation should be considered carefully in the mechanical design of Li-ion batteries, in order to keep they working reliably and safely in the charge-discharge process.