New sustainable method devised for lithium extraction in light of rising demand for EVs. Just_Super / iStock
Scientists have been rapidly advancing new methods in the world of lithium.
In a fresh development, a new study undertaken by scientists from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences, along with collaborators developed an eco-friendly, durable method for lithium extraction.
Overcoming limitations in separating lithium ions from magnesium ions
The researchers sought to address the limitations in separating lithium ions from magnesium ions in salt-lake brine. They did this by devising a crystalline carbon nitride membrane that mimics biological ion channels.
This development is aspiring to meet the rising demand for lithium caused by the rise of electric vehicle manufacturing and the renewable energy sector while aiming to also minimize the environmental impact associated with traditional lithium mining practices.
The ultimate goal is to enhance the efficiency and sustainability of lithium recovery processes, contributing to the broader adoption of renewable energy technologies and electric mobility.
‘Congener-welded’ crystalline carbon nitride membrane introduced
The study introduced a “congener-welded” crystalline carbon nitride membrane with bio-inspired enhancements that significantly outperform traditional polymer membranes according to a statement by the scientists.
The statement added that the new membrane can efficiently extract lithium ions from a mix with much higher magnesium content, achieving a selectivity ratio of 1,708, also necessary for managing the common high magnesium levels in lithium sources.
“Our approach was to mimic these natural systems, creating a membrane with both high selectivity and enhanced stability, which are critical for practical applications,” stated ZHANG Yuanyuan, co-first author of the study.
The membrane comprises a combination of crystalline and amorphous forms of polymer carbon nitrite which allows for its uniformity and narrow pores. They exclude larger hydrated magnesium ions while letting smooth lithium-ion travel.
The design is inspired by natural ion channels, which are highly selective and stable, crucial for practical applications. This structure and functionality lead to enhanced selectivity and stability compared to traditional polymer membranes as per the statement.
New possibilities beyond lithium extraction
“The dual functionality of our membrane opens up new possibilities for its use beyond lithium extraction,” stated Prof. GAO Jun, co-corresponding author of this study.
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“These properties could make a significant contribution to environmental protection efforts, in addition to improving the efficiency of resource recovery.”
Prof. LIU Jian, co-corresponding author added: “The advances achieved through this membrane technology offer new possibilities for efficient extraction of lithium, a crucial element in the transition to renewable energy and electric mobility.”
The method could pave the way for a more viable longer-lasting solution for lithium extraction which is also more eco-friendly. The membrane’s sustainability comes from its high efficiency, durability, and bio-inspired design, which allows for effective lithium extraction with minimal environmental impact.
The study was published earlier today [June 14, 2024] in the journal – Science Advances.
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