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Preparation method of high performance lithium ion battery positive electrode material lithium iron phosphate

A lithium-ion battery and lithium iron phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of ammonia gas generation, increase process complexity, and unfavorable environmental protection, etc., and achieve easy process control and excellent performance. Excellent cycle performance and electrochemical performance

Active Publication Date: 2007-04-18
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials he uses still inevitably produce ammonia gas during the microwave reaction, which is not conducive to environmental protection or increases the complexity of the process by treating the tail gas

Method used

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  • Preparation method of high performance lithium ion battery positive electrode material lithium iron phosphate
  • Preparation method of high performance lithium ion battery positive electrode material lithium iron phosphate
  • Preparation method of high performance lithium ion battery positive electrode material lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] will contain LiOH·H 2 O 4.11 g or Li 2 CO 3 3.69 grams or 6.59 grams of lithium acetate and Mg(OH) 2 0.0583g or magnesium acetate 0.142g or magnesium carbonate 0.084g or MgC 2 o 4 2H 2 0.148 grams of 10 grams of slurry injection containing 32.67 grams of phosphoric acid solution (containing 9.8 grams of phosphoric acid, concentration 30%) in the reaction tank, concentrated crystallization after the reaction 1-10h made containing Mg 2+Lithium dihydrogen phosphate crystals. prepared containing Mg 2+ The XRD figure of lithium dihydrogen phosphate, as accompanying drawing 1. will contain Mg 2+ 10.17 grams of lithium dihydrogen phosphate and 18.02 grams of ferrous oxalate dihydrate or 17.40 grams of ferrous acetate, and 15 grams of sucrose are added at the same time, and they are ball-milled and mixed together, and then put into a microwave oven. 2 or N 2 The microwave synthesis reaction was carried out under the protection of an inert atmosphere. The reaction con...

Embodiment 2

[0026] will contain LiOH·H 2 O 4.11 g or Li 2 CO 3 3.69 grams or 6.59 grams of lithium acetate and Al(OH) 3 0.0781 grams of 10 grams of slurry is injected into a reaction tank containing 32.67 grams of phosphoric acid solution containing 9.8 grams of phosphoric acid and a concentration of 30%. Concentrate and crystallize after reacting for 1-10 hours to obtain Al 3+ Lithium dihydrogen phosphate crystals. will contain Al 3+ 10.24 grams of lithium dihydrogen phosphate and 18.02 grams of ferrous oxalate dihydrate or 17.40 grams of ferrous acetate, and 15 grams of sucrose are added at the same time, and they are ball-milled and mixed together, and then put into a microwave oven. 2 or N 2 The microwave synthesis reaction was carried out under the protection of an inert atmosphere. The reaction condition was 800°C, and the reaction time was 15 minutes. 3+ Metal ion LiFePO 4 / C Composite.

Embodiment 3

[0028] will contain LiOH·H 2 O 4.11 g or Li 2 CO 3 3.69 g or Lithium Acetate 6.59 g and TiO 2 0.0799 grams of 10 grams of slurry is injected into a reaction tank containing 32.67 grams of phosphoric acid solution containing 9.8 grams of phosphoric acid and a concentration of 30%, and concentrated and crystallized after reacting for 1-10 hours to obtain Ti 4+ Lithium dihydrogen phosphate crystals. will contain Ti 4+ 10.31 grams of lithium dihydrogen phosphate and 18.02 grams of ferrous oxalate dihydrate or 17.40 grams of ferrous acetate, and 15 grams of sucrose are added at the same time, and they are ball-milled and mixed together, and then put into a microwave oven. 2 or N 2 The microwave synthesis reaction was carried out under the protection of an inert atmosphere. The reaction condition was 800°C and the reaction time was 15 minutes. 4+ Metal ion LiFePO 4 / C Composite.

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Abstract

The present invention relates to a preparation method of high-performance lithium ion battery positive electrode material lithium iron phosphate. Said method includes the following steps: uniformly mixing self-made lithium dihydrogen orthophosphate containing doped element, ferrous oxalate or ferrous acetate and electric conducting agent or precursor of said electric conducting agent according to a certain mixing ratio, then placing the mixture into a microwave reaction furnace with inert gas protection, calcining, making heat treatment and cooling to room temperature so as to obtain the invented lithium ion battery positive electrode material lithium iron phosphate.

Description

technical field [0001] The invention relates to a battery material, in particular to a preparation method of lithium iron phosphate, a positive electrode material of a high-performance lithium ion battery. Background technique [0002] Since the Goodenough research group reported LiFePO in 1997 4 Since it has the function of delithiation and intercalation of lithium, the phosphate material LiMPO with olivine structure 4 (M=Fe 2+ 、Co 2+ 、Ni 2+ , Mn 2+ ) has attracted much attention because of its very stable thermodynamic properties. Of which LiFePO 4 It has a wide range of raw material sources, low price, and excellent high-temperature performance as a lithium-ion battery cathode material, so it is considered to be an ideal lithium-ion secondary power battery cathode material. [0003] Currently synthesized LiFePO 4 The methods mainly include high-temperature solid-phase method, hydrothermal method, sol-gel method, liquid-phase redox method, and solid-phase microwave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 胡国荣
Owner HUNAN RESHINE NEW MATERIAL