Abstract NiFe2O4-doped aluminum–lithium-layered double hydroxide (NiFe2O4@AlLi-LDH) was synthesized using the coprecipitation method. The main components of the samples are AlLi-LDH and Al(OH)3. The coprecipitation process of Li+ and Al3+ in alkaline solutions can be promoted by the addition of NiFe2O4, and hydroxide ions preferentially exist between the layers over chloride ions. The aging process of samples synthesized by the coprecipitation of Li+ and Al3+ is primarily a restructuring process of the Al-O layer, while the masses of samples just increase a little. The mass of the samples increases from 1.35 to 3.87?g because of the addition of NiFe2O4. The sample after the aging process presents a regular flower-like structure with a diameter of about 2–5?μm, and the thickness of the sheet is about 200?nm. The Li+ adsorption amount of NiFe2O4@AlLi-LDH can reach 3.31?mg/g. Due to the metastable structure of AlLi-LDH, AlLi-LDH prefers to transform to Al(OH)3 because of the higher stability of the Al-O octahedral structure in Al(OH)3 during the Li+ adsorption and desorption processes.Graphical Abstract
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