Preparation method of high-compaction-density lithium iron phosphate positive electrode material

By employing a process involving graded sand milling, ultrasonic treatment, and segmented calcination, the problem of low compaction density of lithium iron phosphate was solved, enabling the preparation of high compaction density lithium iron phosphate materials and improving battery energy density and range.

CN117228651BActive Publication Date: 2026-07-24GUIZHOU PHOSPHATING NEW MATERIAL TECH CO LTD
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU PHOSPHATING NEW MATERIAL TECH CO LTD
Filing Date
2023-10-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The low compaction density and low actual specific capacity of lithium iron phosphate limit its application in electric vehicles and large-scale energy storage markets.

Method used

A method combining graded sand milling and ultrasonic treatment with segmented calcination is used to control particle size distribution and particle size dispersion. Dense particles are formed by spray drying, thereby improving the compaction density of lithium iron phosphate.

Benefits of technology

The compaction density of lithium iron phosphate has been increased to ≥2.6 g/cm3, which enhances the battery energy density, improves the driving range of new energy vehicles, and facilitates large-scale energy storage.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure FT_1
    Figure FT_1
  • Figure SMS_1
    Figure SMS_1
Patent Text Reader

Abstract

The application discloses a preparation method of high compaction density lithium iron phosphate positive electrode material. The method comprises the following steps: (1) a low-temperature grading sand milling process: iron phosphate, lithium carbonate, carbon source, dispersant and deionized water are stirred and dissolved according to a certain proportion (iron phosphate: lithium carbonate: carbon source = 1:1.03:0.1), and then are added into a reactor to obtain a raw material dissolved mixture slurry. The prepared mixture slurry is added into sand mills with different frequencies according to a certain proportion (ultra-fine sand milling: medium-grain sand milling: coarse-grain sand milling = 1:3:1), and after sand milling, the mixture is mixed into a mixing container for ultrasonic treatment. (2) spray drying: the mixture slurry treated by ultrasonic treatment is subjected to spray drying. (3) staged program calcination: the dried sample is placed in a tube furnace, is subjected to programmed temperature calcination under the protection of argon, and after natural cooling, the lithium iron phosphate product is obtained. The process flow of the application is simple, stable control is realized, the compaction density index of the lithium iron phosphate is improved, and the compaction density is greater than or equal to 2.6 g / cm 3 .
Need to check novelty before this filing date? Find Prior Art