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Highlights
UNSW develops a lithium-ion battery using food-based acids for cheaper and eco-friendly energy storage.
The new battery chemistry offers a solution to both battery demand and food waste management.
Coffee grounds show promise for improving the stability of next-gen lithium-sulfur batteries.
Researchers from the University of New South Wales have developed a novel lithium-ion battery chemistry that uses food-based acids, offering a more cost-effective and environmentally friendly alternative to traditional materials. The innovative approach aims to reduce reliance on graphite compounds by replacing them with acids commonly found in foods like sherbet and wine. This breakthrough could lead to cheaper batteries with improved energy storage capacities while tackling food waste.
The prototype battery developed by the UNSW team uses materials such as tartaric acid and malic acid, which are readily available from food waste streams. According to Professor Neeraj Sharma, the lead researcher from UNSW Science, these food-derived acids provide a greener alternative to conventional materials, reducing environmental impact and offering a new use for waste products. In addition to being less harmful, the production process for this battery component involves water instead of toxic solvents, further enhancing its sustainability.
The potential impact of this innovation is significant. Australia spends $36.6 billion annually managing food waste, which also contributes around 3% of the country's total greenhouse gas emissions. By using food waste to produce battery components, industries can address both environmental concerns and the growing demand for cost-effective, purpose-built batteries in the energy transition to net-zero.
The UNSW team is also exploring other waste streams, including coffee grounds, as a source of carbon for lithium-ion battery anodes. Collaboration with the Sustainable Materials Research and Technology centre, the School of Chemistry at UNSW, and CSIRO Clayton has shown that coffee waste-derived carbon frameworks can enhance the stability of lithium-sulfur (Li-S) batteries, which have the potential to hold ten times the energy capacity of current lithium-ion batteries.
Despite the promise of Li-S batteries, their stability over time has been a challenge. However, the use of pyrolysed coffee grounds has shown to improve battery chemistry, achieving 98% efficiency after 100 charge/discharge cycles. This discovery opens new possibilities for using waste-derived materials in energy storage applications, offering both environmental and economic benefits.
As the world shifts towards cleaner energy solutions, these advancements in battery technology provide a glimpse into a future where food and coffee waste can play a crucial role in powering our devices and reducing environmental impact.
