Nanoneedle-Assembled Hollow a–Fe2O3 Microflowers as Li-Ion Battery Anode with High Capacity and Good Temperature Tolerance

Abstract

Lithium-ion battery has been widely used in portable electronic and electrical vehicles; however, low-capacity graphite anode restricts the overall energy density, which makes the seeking of high-capacity anode candidates is of great significance. Here, we present a novel hollow α-Fe2O3 microflower composing of self-assembled nanoneedles, which are synthesized by hydrothermal method. The capacity of hollow α-Fe2O3 microflower anode remains at 768 mAh g-1 after 100 cycles at 0.2 A g-1. Besides, the capacity is 565 mAh g-1 over 100 cycles at 0.5 A g-1. Furthermore, the capacity exceeds 800 mAh g-1 over 50 cycles at 0.5 A g-1 and 45°C, indicating a potential for applications at a high temperature.