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Lithium iron phosphate positive electrode material as well as preparation method and application thereof

A technology for lithium iron phosphate and positive electrode materials, applied in chemical instruments and methods, battery electrodes, phosphorus compounds, etc., can solve the problems of poor product uniformity, large crystal grains, and difficult temperature control, and achieve uniform particle distribution and simple preparation methods , good effect of compaction

Pending Publication Date: 2022-07-12
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the oxidation reaction of the raw material during high-temperature calcination and improves the conductivity of the material at the same time, but this type of method requires high temperature and long-term calcination, the temperature is difficult to control, the product uniformity is poor, and the grain size is large.

Method used

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  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof
  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof
  • Lithium iron phosphate positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0056] The present invention provides a lithium iron phosphate positive electrode material, the grain size Z of the lithium iron phosphate positive electrode material, compaction T (test under 2 tons of pressure, standing for 1 minute), D50, Li / Fe molar ratio I are as follows as shown in Table 1;

[0057] The preparation method of the lithium iron phosphate positive electrode material is as follows:

[0058] (1) The iron phosphate, Li 2 CO 3 , Polypropanol is wet-milled and mixed in a grinder according to the molar ratio of 1:0.5:0.015;

[0059] 2) spray-drying the mixed material at 200° C., and then pulverizing it in a jet mill, wherein the grinding pressure is 0.4, and the particle size requires D50 to be 1 μm, to obtain a lithium iron phosphate precursor;

[0060] 3) The pulverized material in 2) and the lithium dihydrogen phosphate are uniformly stirred and mixed together in a dry method according to a molar ratio of 1:0.005. Finally, in a nitrogen atmosphere, calcined ...

Embodiment 2

[0063] The present invention provides a lithium iron phosphate positive electrode material, the grain size Z of the lithium iron phosphate positive electrode material, compaction T (test under 2 tons of pressure, standing for 1 minute), D50, Li / Fe molar ratio I are as follows as shown in Table 1;

[0064] The preparation method of the lithium iron phosphate positive electrode material is as follows:

[0065] 1) The iron phosphate, Li 2 CO 3 , Polypropanol is wet-milled and mixed in a grinder according to the molar ratio of 1:0.5:0.01;

[0066] 2) spray-drying the mixed material at 200° C., and then pulverize it in a jet mill, wherein the grinding pressure is 0.4, and the particle size requires D50 to be 1.0 μm, to obtain a lithium iron phosphate precursor;

[0067] 3) The pulverized material and dilithium hydrogen phosphate in 2) are uniformly stirred and mixed together in a dry method according to a molar ratio of 1:0.003, and finally in a nitrogen atmosphere, calcined at ...

Embodiment 3

[0069] The present invention provides a lithium iron phosphate positive electrode material, the grain size Z of the lithium iron phosphate positive electrode material, compaction T (test under 2 tons of pressure, standing for 1 minute), D50, Li / Fe molar ratio I are as follows as shown in Table 1;

[0070] The preparation method of the lithium iron phosphate positive electrode material is as follows:

[0071] 1) Wet-milling and mixing iron phosphate, LiOH, and polypropanol in a mill at a molar ratio of 1:1:0.015.

[0072] 2) spray-drying the mixed material at 200°C, and then pulverizing it in a jet mill, wherein the grinding pressure is 0.4, and the particle size requires D50 to be 1 μm, to obtain a lithium iron phosphate precursor;

[0073] 3) The pulverized material and lithium dihydrogen phosphate in 2) are uniformly stirred and mixed together in a dry method according to a molar ratio of 1:0.001, and finally in a nitrogen atmosphere, calcined at 750 ° C for 10 hours, coole...

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Abstract

The invention provides a lithium iron phosphate positive electrode material and a preparation method and application thereof. The lithium iron phosphate positive electrode material is obtained by mixing and sintering a lithium iron phosphate precursor and a second lithium source, and the lithium iron phosphate precursor is obtained by spray-drying a first lithium source, an iron source and a carbon source; the ratio I of the total molar weight of the lithium element in the first lithium source and the second lithium source to the molar weight of the iron element in the lithium iron phosphate precursor is more than 1 and less than or equal to 1.005. By adjusting the Li / Fe molar ratio in the preparation process of the lithium iron phosphate, the grain size of the lithium iron phosphate is changed, the primary particle structure composition of the positive electrode material is changed, the transmission path of lithium ions is shortened, the condition of large lithium ion deintercalation resistance is relieved, and the capacity and the cycle performance of the material are further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium iron phosphate positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the most widely used electrochemical power source. The most representative of such batteries is the lithium secondary battery that generates electrical energy due to the change of chemical potential of lithium ions in the positive and negative electrodes during intercalation and deintercalation. (LIBs). The cathode material directly dominates the performance of LIBs, so many researchers are committed to realizing the cathode material with large capacity, fast charge / discharge speed, and long cycle life, which can perform reversible intercalation and deintercalation of lithium ions. [0003] The olivine cathode material is mainly LiFePO 4 Positive electrode material, the voltage platform is...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45H01M10/0525
CPCH01M4/5825H01M10/0525C01B25/45H01M2004/028Y02E60/10
Inventor 王壮张树涛李子郯王亚州白艳杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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