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Lithium iron phosphate modified material, preparation method and lithium battery using modified material

A technology of lithium iron phosphate and modified materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor rate performance and cycle life

Pending Publication Date: 2021-04-16
沁新集团(天津)新能源技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is in order to overcome LiMn in the prior art (1-x) Fe x PO 4 As a positive electrode of a lithium ion battery, the material has the problems of serious manganese dissolution, poor rate performance and cycle life. A modified lithium iron phosphate material, a preparation method and a lithium battery using the modified material are provided. The modified lithium iron phosphate As the positive electrode material of lithium-ion batteries, the material has a high voltage platform, excellent cycle performance and rate performance

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  • Lithium iron phosphate modified material, preparation method and lithium battery using modified material
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  • Lithium iron phosphate modified material, preparation method and lithium battery using modified material

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preparation example Construction

[0023] The present invention provides a kind of preparation method of lithium iron phosphate modified material, wherein, this preparation method comprises:

[0024] (1) first mixing and drying the first lithium source, the first iron source, the first phosphorus source and the solvent to obtain solid particles;

[0025] (2) Oxidize the solid particles to obtain a first precursor, which contains Li 3 Fe 2 (PO 4 ) 3 and Fe 2 o 3 ;

[0026] (3) The second lithium source, the second iron source, the manganese source, the second phosphorus source and the solvent are mixed for the second time;

[0027] (4) The first precursor and the second mixed product are mixed for the third time, and then the third mixed product is mixed with the carbon source for the fourth time to obtain the second precursor;

[0028] (5) Calcining the second precursor in a protective atmosphere to obtain a lithium iron phosphate modified material containing lithium iron phosphate, lithium iron manganes...

Embodiment 1

[0056] This example is used to illustrate the lithium iron phosphate composite material and its preparation method of the present invention.

[0057] (1) 150.82g FePO 4 , 36.95g Li 2 CO 3 and 200g of distilled water were placed in a ball mill for wet ball milling for 2 hours at a speed of 600r / min; the product after ball milling was spray-dried with an inlet temperature of 200°C and an outlet temperature of 90°C; The diameter is 1 μm;

[0058] (2) The product obtained in step (1) is oxidized at 450°C for 4 hours in an air atmosphere to obtain the first precursor, which contains Fe enriched on the surface 2 o 3 Li 3 Fe 2 (PO 4 ) 3 Solid particles; mix and disperse the first precursor and 180g distilled water to form suspension A;

[0059] (3) 3.91g Fe 2 o 3 , 4.58g Mn 3 o 4 , 10.39gLiH 2 PO 4 and 19g of distilled water were sequentially added into a ball mill tank for wet ball milling for 2 hours, and the rotating speed of the ball mill was 600r / min to form a sus...

Embodiment 2

[0065] (1) 150.82g FePO 4 , 41.96gLiOH·H 2 0 and 290g distilled water are placed in ball mill and carry out wet ball milling 2.5h, and the rotating speed of ball milling is 700r / min; The product after ball milling is carried out spray drying, and inlet temperature is 240 ℃, and outlet temperature is 95 ℃; Spray drying forms spherical product, The average particle size is 1.2μm;

[0066] (2) The product obtained in step (1) was oxidized at 420°C for 6 hours in an air atmosphere to obtain the first precursor, which contained Fe enriched on the surface 2 o 3 Li 3 Fe 2 (PO 4 ) 3 Solid particles; mix and disperse the first precursor and 200g distilled water to form suspension A;

[0067] (3) 4.83g FePO 4 , 5.52g MnCO 3 , 4.99gLiH 2 PO 4 , 1.34gLiOH·H 2 0 and 17g of water were sequentially added into a ball mill tank for wet ball milling for 2 hours, and the rotating speed of the ball mill was 700r / min to form a suspension B;

[0068] (4-1) After uniformly mixing suspen...

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Abstract

The invention relates to the field of positive electrode active materials of lithium batteries, and discloses a lithium iron phosphate modified material, a preparation method thereof, a lithium battery using the modified material, and a battery power vehicle. The preparation method of the modified material comprises the following steps: (1) carrying out first mixing on a lithium source, an iron source, a phosphorus source and a solvent, and drying to obtain solid particles; (2) oxidizing the solid particles to obtain a first precursor, wherein the first precursor contains Li3Fe2(PO4)3 and Fe2O3; (3) carrying out second mixing on the lithium source, the iron source, the manganese source, the phosphorus source and the solvent; (4) carrying out third mixing on the first precursor and the second mixed product, and carrying out fourth mixing on the third mixed product and a carbon source to obtain a second precursor; (5) calcining the second precursor in a protective atmosphere to obtain the modified material containing lithium iron phosphate, lithium manganese iron phosphate and carbon. The modified material is used as a positive electrode active component of a lithium ion battery, and has a higher voltage platform and excellent cycle performance and rate capability.

Description

technical field [0001] The invention relates to a positive electrode active material of a lithium ion battery, in particular to a lithium iron phosphate modified material and a preparation method thereof, and a lithium ion battery positive electrode using the modified material, a lithium ion battery, a battery pack and a battery powered vehicle. Background technique [0002] Power lithium batteries with high energy density, good safety and long cycle life are ideal power sources for future electric vehicles. As a commonly used cathode material for lithium-ion batteries, lithium iron phosphate has attracted wide attention due to its advantages of high safety, environmental friendliness, and low cost. Weakly limit its application field. Lithium manganese phosphate and lithium iron phosphate have relatively close theoretical discharge specific capacity, and perform better in terms of thermal stability, high voltage platform, and high energy density. In theory, lithium manganes...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCY02E60/10
Inventor 王宏栋冯明燕
Owner 沁新集团(天津)新能源技术研究院有限公司
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