Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 14, Pages 4178-4189Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm5012845
Keywords
-
Funding
- French Agence Nationale de Recherche
- European Union [330735]
Ask authors/readers for more resources
To enhance the safety, cost, and energy density of Li-ion batteries, significant research efforts have been devoted to the search for new positive electrode materials that exhibit high redox potentials and are composed of low-cost, earth-abundant elements. Sulfate chemistry has yielded promising results for iron-based polyanionic electrode materials using the FeIII+/FEII+ redox couple, including the recent discovery of a monoclinic marinite Li2Fe(SO4)(2) phase (3.83 V vs Li+/Li-0). Here, we report the ball-milling synthesis and electrochemical properties of a new orthorhombic polymorph of Li2Fe(SO4)(2), which reversibly reacts with lithium through a two-step redox process (3.73 and 3.85 V vs Li+/Li-0) with an overall sustained capacity of about 90 mAh/g. Using similar synthesis conditions, the cobalt-, zinc-, magnesium-, and nickel-based orthorhombic analogues were also obtained, though no electrochemical activity was observed for these phases. Overall, our results demonstrate that polymorphism can play a crucial role in the search for new battery electrode materials and emphasize the need to understand and master synthetic control.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available