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Lithium-sulfur batteries for electric vehicles

02.12.2013

Employees of the Lawrence Berkeley National Laboratory (USA) have created a laboratory prototype of a lithium-sulfur battery (Li-S), which has twice the energy density compared to lithium-ion batteries.

The new battery provides more than 1500 charge-discharge cycles with minimal capacity loss. This is the longest life cycle for this type of battery to date. The demand for high-capacity batteries for hybrid and all-electric vehicles is driving scientists to look for new types of batteries that could provide vehicles with a longer range than today's popular lithium-ion batteries.

In order for an electric car to be able to cover at least 450 km on a single charge, the specific energy produced by the battery must be from 350 to 400 W h / kg. However, modern lithium-ion batteries provide only half of this energy. Another important requirement: batteries must provide about 1000-1500 charge-discharge cycles without significant power loss.

Prototypes of batteries created in the laboratory. Lawrence, potentially provide the possibility of creating electric vehicles with a range equivalent to the range of cars with gasoline units. At the same time, electric vehicles are fundamentally different in that they have zero emissions. Under laboratory conditions, the lithium-sulfur battery generated more than 500 Wh/kg during the initial testing phase and provided energy production of the order of 300 Wh/kg after passing 1000 charge/discharge cycles.

Currently, the development team is looking for support to continue the work on the improvement of lithium-sulfur batteries. Scientists also need to solve the issues of more complete utilization of sulfur, issues of extreme operation of batteries, etc.

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Honda bi-directional charging system for electric vehicles 10.12.2017

An advanced bi-directional charging system for electric vehicles will be tested at the Honda European Research Center in Offenbach, Germany.

The new installation is able not only to take electricity from the network, but also to return back part of the charge accumulated in the battery of an electric vehicle. This achieves the most efficient use of energy and reduces overall operating costs.
A bi-directional distributor can direct electricity, obtained from the grid or generated by solar panels, to charge an electric car connected to the system. On the other hand, once the car is connected to a power outlet, the energy stored in its battery can be channeled into the home network to stabilize it in the event of an outage.

During the tests, Honda engineers will check how harmoniously and efficiently various electrical components interact, in particular, renewable energy sources and electric car batteries. In addition, the specialists intend to test innovative software that will allow the use of this technology in private households in the near future.

Looking ahead, Honda believes, investment in bi-directional power distributor technology will improve even the most advanced public electric vehicle charging stations.

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