Method for improving activity of lithium iron phosphate at low temperature

By adding stable lithium-replenishing additives, modifiers, and morphology control agents to lithium iron phosphate batteries, their structure and morphology are optimized, solving the problem of poor performance of lithium iron phosphate batteries at low temperatures and improving their discharge capacity and cycle life at low temperatures.

CN115566286BActive Publication Date: 2026-05-29JIANGXI ZHILI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGXI ZHILI TECH CO LTD
Filing Date
2022-09-20
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Lithium iron phosphate batteries exhibit problems such as low discharge capacity, decreased discharge voltage plateau, poor rate performance, and rapid capacity decay at low temperatures, resulting in a significant reduction in cycle life.

Method used

By employing a combination of stable lithium-supplementing additives, modifiers, and morphology control agents, and through specific preparation methods and processes, including mixing, ball milling, spray drying, sintering, and air jet milling, the structure and morphology of lithium iron phosphate are optimized, thereby improving its low-temperature activity and cycle performance.

Benefits of technology

It significantly improves the discharge capacity and cycle life of lithium iron phosphate batteries at low temperatures, enhances the capacity retention rate of lithium batteries at low temperatures, and achieves a longer cycle life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a method for improving the activity of lithium iron phosphate at low temperature. The lithium ion content in the lithium iron phosphate is increased by adding a lithium supplement additive, so that the low-temperature activity of the lithium iron phosphate is improved. The lithium supplement additive is stable in structure by modification of coating properties. The atoms such as chromium, magnesium and cobalt in the modifier and the doping of heteroatoms optimize the spatial structure of the lithium iron phosphate, so that the low-temperature activity of the lithium iron phosphate is improved. When sintering, the carbon element in the modifier is coated on the surface of the lithium iron phosphate to form a film, so that the low-temperature activity of the lithium iron phosphate is further improved. Moreover, the components in the modifier also contain grinding aids. The morphology control agent contains antistatic components, so that the shape of the lithium iron phosphate is close to spherical by the morphology control agent, the tap density of the lithium iron phosphate is improved, and the low-temperature activity of the lithium iron phosphate is further improved.
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