Pellion Technologies Inc., an MIT spin-out company researching new magnesium-based energy storage systems has recently launched its website:
Pellion Technologies Inc.
The company is an early-stage company developing an innovative energy storage solution with the potential to deliver substantially lower cost and higher energy density than current lithium ion systems. Pellion, based in the Boston, MA area, is backed by top-tier venture capital and a recent award from the U.S. Department of Energy to develop next-generation batteries.
Jerry
Friday 23 July 2010
AMSO4F: Fluorosulfates - New Active Materials for Advanced Battery Applications
Alkali metal fluorosulfate materials (AMSO4F, A = Li or Na; M = transition metal in oxidation state +2) are currently receiving significant attention as potentially valuable cathode active materials for advanced battery applications. The lithium-based materials all possess the triclinic, tavorite structure - so are isostructural with the lithium vanadium fluorophosphate phase, LiVPO4F.
Of particular note are the iron and manganese phases, LiFeSO4F and LiMnSO4F, which may represent important and new electroactive materials for Li-ion batteries. These materials offer a theoretical specific capacity of around 150 mAh/g (assuming the reversible cycling of 1 Li ion per formula unit). The Fe analog operates at around 3.5-3.6 V vs. Li - meaning that it generates a specific energy comparable with LiFePO4. When combined with its superior electronic conductivity, this performance suggests that LiFeSO4F could challenge the iron olivine, LiFePO4 as a low-cost active material for future large format Li-ion battery applications.
The challenges ahead will no doubt involve the development of a inexpensive and scalable synthesis method. Recent publications and presentations at the IMLB-2010 conference in Montreal suggest that the preparative approach adopted will be of critical importance in determining the electrochemical performance.
The use of these materials in energy storage applications is covered in the following US Patent application (US 2005/0163699 - Inventors: Jerry Barker and co-workers; Assignee: Valence Technology Inc.). The link to this patent application may be found here:
Fluorosulfate-based electrode active materials and methods of making the same
It should also be stressed that earlier US patent and US patent applications (involving the same inventors) also exist.
Jerry
Of particular note are the iron and manganese phases, LiFeSO4F and LiMnSO4F, which may represent important and new electroactive materials for Li-ion batteries. These materials offer a theoretical specific capacity of around 150 mAh/g (assuming the reversible cycling of 1 Li ion per formula unit). The Fe analog operates at around 3.5-3.6 V vs. Li - meaning that it generates a specific energy comparable with LiFePO4. When combined with its superior electronic conductivity, this performance suggests that LiFeSO4F could challenge the iron olivine, LiFePO4 as a low-cost active material for future large format Li-ion battery applications.
The challenges ahead will no doubt involve the development of a inexpensive and scalable synthesis method. Recent publications and presentations at the IMLB-2010 conference in Montreal suggest that the preparative approach adopted will be of critical importance in determining the electrochemical performance.
The use of these materials in energy storage applications is covered in the following US Patent application (US 2005/0163699 - Inventors: Jerry Barker and co-workers; Assignee: Valence Technology Inc.). The link to this patent application may be found here:
Fluorosulfate-based electrode active materials and methods of making the same
It should also be stressed that earlier US patent and US patent applications (involving the same inventors) also exist.
Jerry
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