Lithium iron manganese phosphate/carbon coated ternary material and preparation method thereof, positive electrode of lithium ion battery and lithium ion battery

A technology for lithium-ion batteries and ternary materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as difficult control of material phase purity, reduce internal inert areas, facilitate large-scale production, and shorten distances Effect

Active Publication Date: 2021-10-26
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 ternary material is (LiNi x co y mn 1-x-y o 2 ), due to the synergistic effect of the three metals, the performance of the material is better than that of any single metal oxide, and its stable cycle performance, high energy density and high capacity have attracted widespread attention, and the material has been identified as a hybrid electric vehicle One of the best candidates for the positive electrode material of the energy system, but in the process of use, especially as the positive electrode material of the power battery, the high charging voltage will cause the electrolyte to decompose, and the high calcination temperature will also lead to the phase purity of the material. It is difficult to control, and the safety performance caused by its cycle capacity retention and high activity of the material are all existing problems of the material

Method used

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  • Lithium iron manganese phosphate/carbon coated ternary material and preparation method thereof, positive electrode of lithium ion battery and lithium ion battery
  • Lithium iron manganese phosphate/carbon coated ternary material and preparation method thereof, positive electrode of lithium ion battery and lithium ion battery
  • Lithium iron manganese phosphate/carbon coated ternary material and preparation method thereof, positive electrode of lithium ion battery and lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Preparation of LiMn by a two-step solid-phase method 0.6 Fe 0.4 PO 4 / C composite material, weigh 0.2molFe according to the stoichiometric ratio 2 o 3 , 0.2mol Mn 3 o 4 and 1mol LiH 2 PO 4 , and then weighed according to Fe 2 o 3 , Mn 3 o 4 , LiH 2 PO 4 The theoretical mass of 2wt% anhydrous glucose calculated by the number of moles, a certain amount of distilled water was added to the ball mill tank for wet ball milling for 2 hours, the slurry after ball milling was spray-dried to prepare precursor 1, and the precursor 1 was placed in Precursor 2 was obtained by oxidizing at 420°C for 4 hours in an air atmosphere, and then the precursor 2 was mixed with 9 wt% anhydrous glucose by weight of the precursor 2 for 2 hours by wet ball milling, and the precursor 3 was obtained after spray drying. Finally, under a nitrogen atmosphere, Calcined at 700°C for 4h, with a heating rate of 10°C / min, to obtain the final product LiMn 0.6 Fe 0.4 PO 4 / C Composite.

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Embodiment 2

[0063] Preparation of LiMn by a two-step solid-phase method 0.6 Fe 0.4 PO 4 / C composite material, weigh 0.2molFe according to the stoichiometric ratio 2 o 3 , 0.2mol Mn 3 o4 and 1mol LiH 2 PO 4 , and then weighed according to Fe 2 o 3 , Mn 3 o 4 , LiH 2 PO 4 The theoretical mass of 2wt% anhydrous glucose calculated by the number of moles, a certain amount of distilled water was added to the ball mill tank for wet ball milling for 2 hours, the slurry after ball milling was spray-dried to prepare precursor 1, and the precursor 1 was placed in Precursor 2 was obtained by oxidation at 450°C for 4 hours in an air atmosphere, and then the precursor 2 and 10wt% anhydrous glucose by weight of the precursor 2 were mixed by wet ball milling for 2 hours, and the precursor 3 was obtained by spray drying. , calcined at 720°C for 4h, and the heating rate was 10°C / min to obtain the final product LiMn 0.6 Fe 0.4 PO 4 / C Composite. The performance of the composite material is ...

Embodiment 3

[0068] Preparation of LiMn by a two-step solid-phase method 0.7 Fe 0.3 PO 4 / C composite material, weigh 0.35molFe according to the stoichiometric ratio 2 o 3 , 0.1mol Mn 3 o 4 and 1mol LiH 2 PO 4 , and then weighed according to Fe 2 o 3 , Mn 3 o 4 , LiH 2 PO 4 Anhydrous glucose of 5wt% of the theoretical mass calculated by moles, a certain amount of distilled water was added to the ball mill tank for wet ball milling for 2 hours, and the slurry after ball milling was spray-dried to obtain precursor 1, and the precursor 1 was placed in Precursor 2 was obtained by oxidation at 500°C for 2 hours in an air atmosphere, and then the precursor 2 and 10wt% anhydrous glucose by weight of the precursor 2 were mixed by wet ball milling for 2 hours, and the precursor 3 was obtained by spray drying. Finally, under a nitrogen atmosphere, Calcined at 730°C for 4h, with a heating rate of 10°C / min, to obtain the final product LiMn 0.7 Fe 0.3 PO 4 / C Composite. The performance...

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Abstract

The invention discloses a lithium manganese iron phosphate / carbon coated ternary material and a preparation method thereof, a positive electrode of a lithium ion battery and a lithium ion battery. The method comprises the following steps: 1) adding Fe 2 o 3 , Mn 3 o 4 , LiH 2 PO 4 Perform the first ball milling with the first organic carbon source and the first drying to obtain the precursor 1; 2) place the precursor 1 in the air atmosphere for heat treatment to obtain the precursor 2; 3) conduct the second organic carbon source with the precursor 2 Second ball milling and second drying to obtain precursor 3; 4) Precursor 3 was sintered at a constant temperature under the protection of an inert atmosphere to obtain LiMn (1‑x) Fe x PO 4 / C composite material; 5) LiMn (1‑x) Fe x PO 4 / C composite material, binder and conductive agent are dispersed in an oil solvent to prepare a slurry; 6) The slurry is coated on the surface of the pole piece prepared by the ternary material and dried. The preparation method is simple and easy to operate, the cost is low, and the product has excellent electrical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a lithium manganese iron phosphate / carbon coated ternary material and a preparation method thereof, a positive electrode of a lithium ion battery and a lithium ion battery. Background technique [0002] Since the pioneering work done by Goodenough et al. on phosphate system cathode materials, people have conducted extensive research on lithium iron phosphate cathode materials and industrialized them. LiFePO 4 As a cathode material for lithium-ion batteries, it has received extensive attention due to its advantages such as high safety performance, good thermal stability, good electrochemical performance, abundant raw material reserves, and low cost. However, olivine-type LiFePO with a low voltage platform of 3.4V, poor electronic conductivity, and weak ion diffusion 4 The field of its application is limited. Although LiMnPO 4 with LiFePO 4 The structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M10/0525
CPCH01M4/136H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
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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