Facile preparation of high-performance Mn and Mg co-doped FeO nanorod for lithium-ion battery anode from refined green alum slag-a "turn waste into treasure" strategy

In this work, a "turn waste into treasure" strategy is proposed to synthesize Fe 2 O 3 and use it as a lithium-ion battery (LIB) anode from green alum slag, a by-product of TiO 2 production in the industry. Through this method, a heteroatom-doped Fe 2 O 3 was obtained and showed a stable specific capacity of 1209 mA h g −1 at 500 mA g −1 , which was superior to pure-Fe 2 O 3 that was prepared in the laboratory. Besides, the full battery was assembled with Fe 2 O 3 as the anode, and the specific capacity was maintained at 102 mA h g −1 after 100 cycles of stable cycling at 1.0 A g −1 , showing excellent cycling and rate performance. This work offers a green low-cost and promising option for the development of LIBs anode materials and making TiO 2 industrial production more economical and environmentally friendly. Herein, value-added Fe 2 O 3 was recovered from green alum slag, a by-product of TiO 2 production in the industry. It worked well in LIBs as anode, showed a stable specific capacity of 1209 mA h g −1 at 500 mA g −1 .