Preparation of a High-Performance Nanocrystalline Lithium/Graphene Composite Battery via High-Pressure Torsion Method

Abstract

This paper creatively introduces the high-pressure torsion treatment (HPT) technique for the preparation of lithium ion battery electrodes. Through the preparation of a nanocrystalline lithium/graphene composite structure, a high-performance dendrite-free electrode was obtained. Furthermore, for light metal processing via the HPT method, the strain-grain relationship is still applicable under high-pressure torsion and results in excellent electrochemical performance. As a physical metallurgical method for the preparation of nano-metal composite materials, the HPT method has advantages that are not possessed by hydrothermal methods. These include a rapid, low-cost synthesis with minimal by-products from the chemical reaction.

Fig. 4 Characterizing and comparing battery performance (a) Constant-current cycle diagram of coarse-Li and graphene-doped Li symmetrical batteries at a current density of 1 mA cm⁻² and peeling/electroplating capacity of 1 mAh cm⁻²; (b) Rate capability diagram of Coarse-Li and graphene-doped Li|LiFePO₄ batteries within a current density of 0.2–20 C (c) Cycling performances of Coarse-Li and graphene-doped Li|LiFePO₄ batteries at a current density of 0.2 C.