Preparation method of positive electrode material of lithium iron phosphate battery

A technology for lithium iron phosphate batteries and cathode materials, applied in battery electrodes, lithium batteries, chemical instruments and methods, etc., can solve the problems of difficult control of grain growth, inability to produce continuously, long production cycle, etc., and achieve regular appearance, The effect of reduced production cycle and uniform grain size

Active Publication Date: 2014-07-23
江西省金锂科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] For existing lithium iron phosphate (LiFePO 4 ) preparation technology has defects such as incapable of continuous production, high energy consumption, long production cycle, and difficult control of grain growth. The present invention provides a low energy consumption, short production cycle, continuous and stable production of lithium iron phosphate (LiFePO 4 )Methods

Method used

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  • Preparation method of positive electrode material of lithium iron phosphate battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Weigh the basic raw materials lithium phosphate, ferrous oxalate, magnesium chloride, and lithium dihydrogen phosphate into the mixer according to the molar ratio Li:Fe:M:P=1:0.8:0.1:1, and then add 0.2% of the mass of the basic raw materials The esterified styrene maleic anhydride resin is used as a dispersant, and 0.6% of the mass of the basic raw material is added as a grain growth inducer nano-magnesium oxide, and 5% of the mass of the basic raw material is added. Air jet mill, which crushes and homogenizes materials through strong impact and severe friction;

[0030] 2) Send the homogenate obtained in step 1) into a reciprocating single-screw extruder, and the screw reciprocates axially during the radial rotation process, and uses the reciprocating single-screw to shear evenly, highly disperse, and pull The characteristics of stretching make the material homogeneous in the axial direction. Under the action of shearing, turning, kneading and stretching, the grain...

Embodiment 2

[0033] 1) Weigh the basic raw materials lithium hydroxide, ferrous phosphate, beryllium chloride, and ammonium dihydrogen phosphate into the mixer according to the molar ratio Li:Fe:M:P=1:0.8:0.1:1, and then add the mass of the basic raw materials 0.5% of the imidized styrene maleic anhydride resin is used as a dispersant, adding 1% of the quality of the basic raw material as a grain growth inducer nano-titanium dioxide, adding 6% of the quality of the basic raw material to powder polyethylene, and mixing evenly Send it into the flat airflow mill, and crush and homogenize the material through strong impact and severe friction;

[0034] 2) Send the homogenate obtained in step 1) into a reciprocating single-screw extruder, and the screw reciprocates axially during the radial rotation process, and uses the reciprocating single-screw to shear evenly, highly disperse, and pull The characteristics of stretching make the material homogeneous in the axial direction. Under the action o...

Embodiment 3

[0037] 1) Weigh the basic raw materials lithium nitrate, ferrous oxide, calcium chloride, and diammonium hydrogen phosphate into the mixer according to the molar ratio Li:Fe:M:P=1:0.8:0.1:1, and then add the mass of the basic raw materials 0.4% styrene maleic anhydride amic acid resin as a dispersant, add 0.6% of the mass of the basic raw material grain growth inducer nano-magnesium oxide, add 8% of the mass of the basic raw material polyvinyl chloride, mix evenly and send into Flat airflow mill, crushing and homogenizing materials through strong impact and friction;

[0038] 2) Send the homogenate obtained in step 1) into a reciprocating single-screw extruder, and the screw reciprocates axially during the radial rotation process, and uses the reciprocating single-screw to shear evenly, highly disperse, and pull The characteristics of stretching make the material homogeneous in the axial direction. Under the action of shearing, turning, kneading and stretching, the grain grows...

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium iron phosphate battery. A reciprocating single screw extruder is used as a disposable continuous reactor, and a screw rod does an axial reciprocating movement in a radial rotation process, so that a material is sheared, dispersed, and stretched under the melt condition to reach a homogenizing reaction; through induction of a grain growth inducer, a grain rapidly grows and is completely coated and isolated by a high-molecular polymer, and thus a lithium iron phosphate grain is uniform and fine, and the size of the lithium iron phosphate grain is less than 50nm. Furthermore, according to the preparation method, divalent stable metal ions of an alkaline earth metal periodic system IIA-family element are uniformly doped in the lithium iron phosphate grain, a completely plasticized and dispersed polymer is carbonized through high temperature and high pressure, and thus the conductivity of the lithium iron phosphate grain is improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a preparation method for a positive electrode material of a lithium iron phosphate battery. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) has become one of the current research hotspots of cathode materials for lithium-ion batteries due to its good safety performance, excellent cycle performance, environmental friendliness, and abundant raw material sources since it was reported in 1997 that it has the characteristics of reversible lithium deintercalation. Lithium iron phosphate (LiFePO 4 ) with a relatively high theoretical specific capacity (170 mAh / g), capable of generating 3.4 V ( vs. Li / Li + ) voltage, especially with regular olivine-type lithium iron phosphate (LiFePO 4 ) and its charged state of FePO 4 The unit cell parameters of , belonging to the same space group, are very similar in structure. Therefore, lithium iron pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCC01B25/45H01M4/5825H01M10/052Y02E60/10
Inventor 陈庆曾军堂
Owner 江西省金锂科技股份有限公司
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