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Modified lithium iron phosphate material as well as preparation method and application thereof

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of modified lithium iron phosphate materials and its preparation, can solve the problems that cannot be used for high-current discharge, poor rate performance of lithium iron phosphate materials, etc., so as to improve the diffusion path and increase the capacity and rate performance, the effect of simple preparation process

Pending Publication Date: 2022-05-10
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The modified lithium iron phosphate material provided by the above scheme has the problem of poor rate performance or cannot be used for high-current discharge. Therefore, it is very necessary to develop a lithium iron phosphate material with good rate performance and which can be applied to high-current discharge.

Method used

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  • Modified lithium iron phosphate material as well as preparation method and application thereof
  • Modified lithium iron phosphate material as well as preparation method and application thereof

Examples

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Embodiment 1

[0036] The present embodiment provides a modified lithium iron phosphate material, and the preparation method of the modified lithium iron phosphate material includes the following steps:

[0037] (1) Iron phosphate ( a=5.0354, V / a=49.031, C value equal to 0.03), Li 2 CO 3 , Glucose is wet-milled and mixed in a grinder according to a molar ratio of 1:1.015:0.015 to obtain a mixed material;

[0038] (2) spray-drying the mixed material at 150°C, then calcining at 670°C for 8 hours in a nitrogen atmosphere, cooling and sieving to obtain the modified lithium iron phosphate material. The median value of the modified lithium iron phosphate material is The particle size D50 is 2μm, and the specific surface area is 10m 2 / g, pH 9.5.

[0039] The charge-discharge curve of the modified lithium iron phosphate material is as follows: figure 1 shown.

Embodiment 2

[0041] (1) Iron phosphate ( a=5.0359, V / a=49.050, C value equal to 0.05), Li 2 CO 3 , Glucose is wet-milled and mixed in a grinder according to a molar ratio of 1:1.015:0.015 to obtain a mixed material;

[0042] (2) spray-drying the mixed material at 150°C, then calcining at 670°C for 8 hours in a nitrogen atmosphere, cooling and sieving to obtain the modified lithium iron phosphate material. The median value of the modified lithium iron phosphate material is The particle size D50 is 2.4μm, and the specific surface area is 11.5m 2 / g, pH 9.5.

Embodiment 3

[0044] (1) ferric phosphate ( a=5.0367, V / a=49.061, C value is equal to 0.06), Li 2 CO 3 , Glucose is wet-milled and mixed in a grinder according to a molar ratio of 1:1.015:0.015 to obtain a mixed material;

[0045] (2) The mixed material is spray-dried at 150°C, then calcined at 670°C for 8 hours in a nitrogen atmosphere, cooled, and sieved to obtain the modified lithium iron phosphate material. The median value of the modified lithium iron phosphate material is The particle size D50 is 2.5μm, and the specific surface area is 12m 2 / g, pH 9.5.

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Abstract

The invention provides a modified lithium iron phosphate material and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing iron phosphate, a lithium source and a dopant, and grinding to obtain a mixed material; and (2) carrying out spray drying on the mixed material obtained in the step (1), and calcining to obtain the modified lithium iron phosphate material, wherein the unit cell volume V and the unit cell parameter a of the iron phosphate in the step (1) meet the relational expression C = V / a-49, and C is 0.01-0.1. In the lithium iron phosphate preparation process, by controlling the unit cell parameter and the unit cell volume of the iron phosphate, the conductivity of the material can be improved, the rapid diffusion path of lithium ions and the effective transmission path from the interior of the ions to the surface of the ions can be improved, and the conductivity of the lithium iron phosphate can be improved. Furthermore, the capacity and the rate capability of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a modified lithium iron phosphate 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. Currently, ultra-high nickel materials are considered as the most promising candidates because they can improve the specific capacity...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M10/0525H01M4/136H01M4/58
CPCC01B25/45H01M10/0525H01M4/136H01M4/5825C01P2004/61C01P2006/12H01M2004/028C01P2006/40Y02E60/10
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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