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Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the field of lithium-ion batteries, can solve problems such as low compaction density, and achieve the effects of improving electrical conductivity, material uniformity, and energy density

Active Publication Date: 2018-05-22
FOSHAN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a lithium iron phosphate positive electrode material with a high compacted density, which is used to solve the problem of low compacted density of the lithium iron cobalt phosphate material in the prior art

Method used

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  • Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery

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Embodiment 1

[0057] A preparation method of lithium iron phosphate cathode material, comprising the following steps:

[0058] (1) Get lithium carbonate 7.46g, ferric nitrate 81.2g, ammonium dihydrogen phosphate 23.24g, it is mixed homogeneously, obtains mixed material;

[0059] (2) The above-mentioned mixed material is subjected to ceramic grinding with a nano-ceramic grinding machine, wherein the ceramic grinding is ground for 4 hours by means of a plane counter-grinding method to obtain a powdery precursor with a particle size ≤ 40nm;

[0060] (3) Under a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into the first sintering stage, the second sintering stage and the third sintering stage; the first sintering stage is 3 °C / min The heating rate was raised from room temperature to 180°C, and sintered for 3 hours; the second sintering stage was raised from 180°C to 380°C at a rate of 10°C / min, and sintered for 6 hours; the third sta...

Embodiment 2

[0065] A preparation method of lithium iron phosphate cathode material, comprising the following steps:

[0066] (1) Lithium dihydrogen phosphate (that is, phosphorus source and lithium source) and lithium acetate are mixed in a ratio of molar ratio Li:Fe:P=1:1:1 to obtain a mixed material;

[0067] (2) The above-mentioned mixed material is subjected to ceramic grinding with a nano-ceramic grinder, wherein the ceramic grinding is ground for 3 hours in a plane counter-grinding manner to obtain a powdery precursor with a particle size of less than 50 nm;

[0068] (3) Under a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into the first sintering stage, the second sintering stage and the third sintering stage; the first sintering stage is 5 ° C / min The heating rate was raised from room temperature to 200°C, and sintered for 5 hours; the second sintering stage was raised from 200°C to 400°C at a rate of 20°C / min, and sin...

Embodiment 3

[0071] A preparation method of lithium iron phosphate cathode material, comprising the following steps:

[0072] (1) Ferric phosphate (i.e. iron source and phosphorus source) FePO 4 .2H 2 O and lithium hydroxide are mixed in a molar ratio Li:Fe:P=1:1:1 to obtain a mixed material;

[0073] (2) The above-mentioned mixed material is ground for 4 hours by using a nano-ceramic grinder, wherein the ceramic grinding is ground for 4 hours by means of plane grinding to obtain a powdery precursor with a particle size ≤ 35 nm;

[0074] (3) Under a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into a first-stage sintering stage, a second sintering stage, and a third sintering stage; the first sintering stage is carried out at 10°C / min The heating rate was raised from room temperature to 220°C, and sintered for 6 hours; the second sintering stage was raised from 220°C to 420°C at a rate of 25°C / min, and sintered for 10 hours; th...

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Abstract

The invention provides a lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material comprises a lithium iron phosphate array formed by a plurality of lithium iron phosphate cylinders which are arranged in an array manner and granular lithium iron phosphate distributed in the lithium iron phosphate array, wherein a gap exists in two adjacent lithium iron phosphate cylinders in the lithium iron phosphate array, and every gap is filled with the granular lithium iron phosphate. The lithium iron phosphate positive electrode material having a specificmorphology has a high compacted density and a high lithium ion conductivity. The invention also provides a preparation method of the lithium iron phosphate positive electrode material, and a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium iron phosphate cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are increasingly playing an important role in various fields. As an important part of lithium-ion batteries, the cathode material of lithium-ion batteries determines the performance, price and development of lithium batteries. At present, the most studied cathode material is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 (lithium iron phosphate). Among them, the lithium iron phosphate cathode material concentrates LiCoO 2 , LiNiO 2 , LiMn 2 o 4 It has the advantages of high structural stability, good safety performance, moderate working voltage, good platform characteristics, and large theoretical capacity, etc., and has gradually become a hot research topic for ba...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525B82Y30/00B82Y40/00C01B25/45
CPCB82Y30/00B82Y40/00C01B25/45C01P2004/64C01P2006/11H01M4/5825H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽陈玲震李洁凤
Owner FOSHAN DYNANONIC
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