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PROCESSING METHOD OF LITHIUM IRON PHOSPHATE USED AS POSITIVE ELECTRODE MATERIAL OF LITHIUM ION BATTERY
PROCESSING METHOD OF LITHIUM IRON PHOSPHATE USED AS POSITIVE ELECTRODE MATERIAL OF LITHIUM ION BATTERY
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机译：锂离子电池正极材料磷酸铁锂的制备方法
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摘要
A processing method of lithium iron phosphate used as the positive electrode material of a lithium ion battery comprises: 1) wet-treating the lithium iron phosphate material, i.e. processing the lithium iron phosphate material with a wetting agent of 0.1-3% wt. in concentration, to obtain a homogeneous aqueous suspension of lithium iron phosphate material; 2) leaching high active iron ions on the surface of the lithium iron phosphate material with acid solution, i.e. adding an acid solution with pH value of 0-1 into the suspension of lithium iron phosphate under agitation, to keep the pH value of the obtained solution at the range between 1.5-2.5, while rendering a complete reaction by agitating; 3) filtering and drying, i.e. filtering the solution, washing the filtered lithium iron phosphate with distilled water or pure water, and drying the washed lithium iron phosphate material under vacuum condition or protective gas atmosphere to obtain the finished lithium iron phosphate material. The lithium iron phosphate material is carbon coated. The shelf life and high temperature property of the battery can be improved by the method.
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