Oxis Energy | Date: 2017-06-21
There is provided a Lithium-Sulfur battery management system for determining a state of charge of a Lithium-Sulfur battery (LS1). The management system comprises a first circuit having at least one reactive element (Cb), and the first circuit is configured to discharge and charge fixed amounts of charge from and to the battery (LS1) via the at least one reactive element (Cb). The management system also comprises a second circuit (DA1, MC1) for monitoring the discharging and charging, and the second circuit is configured to measure the discharge time and the charge time of the fixed amounts of charge, and determine the state of charge based on those times. There is further provided a method for determining the state of charge of the Lithium-Sulfur battery.
Oxis Energy and Arkema | Date: 2017-04-05
The present invention relates to a lithium-sulphur cell comprising an anode comprising lithium metal or lithium metal alloy;a cathode comprising a mixture of electroactive sulphur material and solid electroconductive material; and a liquid electrolyte comprising at least one lithium salt and a solvent comprising a dinitrile.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: NMP-17-2014 | Award Amount: 6.90M | Year: 2015
ALISE is a pan European collaboration focused on the development and commercial scale-up of new materials and on the understanding of the electrochemical processes involved in the lithium sulphur technology. It aims to create impact by developing innovative battery technology capable of fulfilling the expected and characteristics from European Automotive Industry needs, European Materials Roadmap, Social factors from vehicle consumers and future competitiveness trends and European Companies positioning. The project is focused to achieve 500 Wh/Kg stable LiS cell. The project involves dedicated durability, testing and LCA activities that will make sure the safety and adequate cyclability of battery being developed and available at competitive cost. Initial materials research will be scaled up during the project so that pilot scale quantities of the new materials will be introduced into the novel cell designs thus giving the following advancements over the current state of the art. The project approach will bring real breakthrough regarding new components, cell integration and architecture associated. New materials will be developed and optimized regarding anode, cathode, electrolyte and separator. Complete panels of specific tools and modelling associated will be developed from the unit cell to the batteries pack. Activities are focused on the elaboration of new materials and processes at TRL4. Demonstration of the lithium sulphur technology will be until batteries pack levels with validation onboard. Validation of prototype (17 kWh) with its driving range corresponding (100 km) will be done on circuit. ALISE is more than a linear bottom-up approach from materials to cell. ALISE shows strong resources to achieve a stable unit cell, with a supplementary top-down approach from the final application to the optimization of the unit cell.
Oxis Energy | Date: 2015-01-14
There is disclosed a chemical source of electric energy comprising a positive electrode including sulphur or sulphur-based organic compounds, sulphur-based polymeric compounds or sulphur-based inorganic compounds as a depolarizer, a negative electrode made of metallic lithium or lithium-containing alloys, and an electrolyte comprising a solution of at least one salt in at least one aprotic solvent. In order to increase the specific energy, the chemical source of electric energy is configured to generate soluble polysulphides in the electrolyte during discharge, and the quantities of sulphur in the depolariser and the volume of electrolyte are selected such that, after discharge of the cathode in a first stage (to a potential of 2.1-1.9V), the concentration of soluble lithium polysulphides in the electrolyte is at least 70% of a saturation concentration of the lithium polysulphides in the electrolyte.
Agency: GTR | Branch: Innovate UK | Program: | Phase: Collaborative Research & Development | Award Amount: 1.26M | Year: 2013
The Revolutionary Electric Vehicle Battery (REVB) project aims to develop a revolutionary Lithium Sulfur (Li-S) vehicle battery and Battery Energy Management (BEM) system which will provide breakthrough improvements in energy density, cost, range and safety of electric vehicle batteries and put the UK in a world leading position to exploit this. The project intends to double the rate of improvement of the OXIS Li-S battery, by developing and embedding a model led R&D culture within OXIS, using a deep understanding of the underlying science which will be developed with Imperial College to inform product development. It is a proven approach within other sectors (such as crash testing) within the automotive industry, but rarely adopted by battery developers. The project will also develop a battery energy manager, working with Lotus and Cranfield, in order to be able to push the chemistry to its limits and achieve 400Wh/kg cell energy density with practical cycle life and performance metrics. The output of the project will offer a battery system for automotive applications that can not only store more energy than today’s technology but can also harness significantly more of that energy, resulting in a compound improvement for next generation Electric Vehicles.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: COMPET-03-2015 | Award Amount: 999.95K | Year: 2015
For space missions, the energy density of batteries is a key factor of systems mass. A recent battery technology, based on this Lithium-Sulfur chemistry and developed by OXIS Energy, has shown promising results, particularly in terms of specific energy and cycling performances. Lithium-Sulfur batteries could become the next breakthrough technology for space batteries, with a factor of two on the specific energy compared to the current Lithium-Ion products. ECLIPSE ambition is to channel the research activities in Europe and, as a spinning-in effort, ensure that the harsh space constraints are taken into account for the further improvements of the Li-S technology. This research action aimed at developing Li-S technology for space applications focusing on three levels: - Cell level studies, including research to optimise the four main cells components: anode, cathode, separator and electrolyte to achieve 400Wh/kg cells compatible with space cycling profiles. - Battery and encapsulation level, including prototyping and theoretical studies. - System level studies for integration in satellite and launcher architectures, taking into account the economic constraints and the future technical challenges. The expected outcomes of ECLIPSE are: - Mass reduction of batteries by a factor two. - Costs reduction at all levels: subsystem, system and launching costs. - Maturation of the technology (TRL 5 expected at the end of the project). The main impacts of this research are related to competitiveness (lighter is cheaper), non-dependency and innovation: beyond current markets, this breakthrough can enable new challenging missions. The impact of the project is secured by the composition of the consortium led by Airbus Defence and Space with the main European actors of the Lithium-Sulfur electrochemistry and space batteries: ECLIPSE will contribute to the consolidation of an independent European industrial supply chain for Lithium-Sulfur batteries. Project duration is 24 months.
Agency: GTR | Branch: Innovate UK | Program: | Phase: Feasibility Study | Award Amount: 58.42K | Year: 2016
OXIS Energy, a manufacturer Lithium Sulfur battery technology has formed a collaboration with the University of Southampton to demonstrate a new rechargeable battery technology capable of achieving high cycle life at competitive costs to target the microgrid energy storage market. The project will exploit OXIS Energys core Lithium Sulfur technology using a new electrolyte classification to extend cycle life. The University of Southampton will exploit their extensive knowledge of novel electrochemical test techniques to assess candidate electrolyte formulations and then test their performance credentials in the laboratory. These new electrolytes will be then scaled up by OXIS and their full performance characterised in a prototype Li-S battery cells. The project will demonstrate the commercial feasibility of this new rechargeable battery technology for stationary energy storage. If successful developed this technology will reduce consumer costs and carbon emissions whilst improving the Uks energy security by being less reliant on foreign imports of fossil fuels.
Oxis Energy | Date: 2014-12-16
An electrolyte for a lithium sulphur cell comprising at least one lithium salt and at least one organic solvent; and a surfactant, wherein the concentration of surfactant in the electrolyte is 0.5 3 weight %.
Oxis Energy | Date: 2014-10-01
A method for charging a lithium-sulphur cell, said method comprising:monitoring the voltage, V, of a cell during charge as a function of time, t, or capacity, Q,determining, in a voltage region in which the cell transitions between the first stage and second stage of charge, the reference capacity, Q_(ref), of the cell at which dV/dt or dV/dQ is at a maximum,terminating charge when the capacity of the cell reaches a.Q_(ref), where a is 1.1 to 1.4.
Oxis Energy | Date: 2014-03-21
A method for charging a lithium-sulphur cell, said method comprising: monitoring the voltage, V, of a cell during charge as a function of time, t, or capacity, Q, determining, in a voltage region in which the cell transitions between the first stage and second stage of charge, the reference capacity, Q_(ref), of the cell at which dV/dt or dV/dQ is at a maximum, terminating charge when the capacity of the cell reaches a.Q_(ref), where a is 1.1 to 1.4.