Organic rechargeable household batteries. Free Technical Library News

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Organic rechargeable household batteries

06.03.2022

Australian and Chinese scientists have developed a 2,8V all-organic polymer battery. It is an ideal alternative to traditional metal-based batteries in particular to reduce environmental pollution.

"Starting with small household batteries, we already know that organic redox materials are typical electroactive alternatives due to their intrinsically safe, lightweight and structurally tunable characteristics and, most importantly, their sustainability and environmental friendliness," says Zhongfang Jia, scientific director of the Nanotechnology Institute at Flinders University.

The research team developed a battery based on silver terephthalate (instead of sodium terephthalate, which is used in lithium-ion batteries). The cell voltage is 2,8 V, the specific capacity is 43 mAh/g. The team is now aiming to improve on these characteristics and create a fully biodegradable battery with a cell voltage of over 3,0V and a capacity of over 200mAh/g.

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The Australian company Lavo introduced the world's first hydrogen battery for home use. The Lavo system stores 40kWh and costs $27. This is three times the capacity of the Tesla Powerwall 2 system, with a relatively small difference in the cost of three Tesla installations versus one Lavo.

As conceived by the developers, the hydrogen battery should utilize excess electricity from home solar panels. To do this, the system provides the necessary terminals for connecting panels. Also, the battery is connected through a purification filter to a source of running water to extract hydrogen from it. A built-in lithium battery with a capacity of 5 kWh insures against drops in the generated voltage. All this is enclosed in a cabinet with sides of 1680 x 1240 x 400 mm, which weighs 324 kg.

Excess electricity from the solar panel produces water electrolysis and stores hydrogen in special containers with sponge filler at a pressure of 30 bar (in the images, there are four red containers with hydrogen on the left). When the sun is not shining, hydrogen is run into a fuel cell in the system and converted into electricity.

At the output, the Lavo system is able to generate a stable 5 kW, which can be regarded as a rather low power. The efficiency of the installation is estimated by the developers as above 50%. In other words, it accumulates as much as it spends on the accumulation process, or even less. On the other hand, the excess energy generated by solar panels can be wasted if it is not possible to sell it to the city system at a feed-in tariff. Therefore, such a system may be relevant for remote settlements. By the way, the life of the key battery cells reaches 30 years, which justifies the significant capital costs of the installation.

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