Preparation method of positive electrode material structure, battery positive electrode, battery and automobile

A positive electrode material, battery positive electrode technology, applied in battery electrodes, positive electrodes, structural parts, etc., can solve the problems of battery charge and discharge rate reduction, unfavorable lithium ion electrolyte transfer, battery charge and discharge rate effects, etc., to improve vibration. Solid density, guaranteed charge-discharge rate performance, guaranteed charge-discharge rate effect

Inactive Publication Date: 2020-04-17
BAIC GRP ORV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An important indicator that affects the energy storage capacity of a lithium-ion battery is the tap density of its positive electrode material. Generally speaking, the higher the tap density, the more positive electrode materials in the same volume, the more energy storage of lithium-ion batteries, and the higher the tap density. It means that the smaller the pores, it is not conducive to the transfer of lithium ions through the electrolyte, which has a greater impact on the charge and discharge rate of the battery, and the charge and discharge rate of the battery will decrease

Method used

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  • Preparation method of positive electrode material structure, battery positive electrode, battery and automobile
  • Preparation method of positive electrode material structure, battery positive electrode, battery and automobile

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preparation example Construction

[0034] The preparation method of the positive electrode material structure according to the embodiment of the present invention comprises the following steps:

[0035] Step S1, obtaining positive electrode material particles having a first particle diameter and a second particle diameter, the first particle diameter being greater than the second particle diameter;

[0036] Step S2, dispersing positive electrode material particles with a first particle diameter and positive electrode material particles with a second particle diameter in the dispersion liquid for stirring and homogenizing to obtain a mixed slurry;

[0037] Step S3, drying the mixed slurry after coating to obtain a mixed material;

[0038] Step S4, calcining the mixture at 300°C-600°C to obtain a positive electrode material structure.

[0039] That is to say, the specific process can be as follows figure 1 As shown, in step S1, positive electrode material particles with a first particle diameter and positive el...

Embodiment 1

[0045] The preparation of lithium iron phosphate particles with a first particle diameter comprises the following steps:

[0046] The iron source material, the phosphorus source material and the lithium source material are respectively added into a solvent to dissolve and mix to obtain a mixed solution, and the solvent is deionized water; wherein, the concentration of iron ions in the mixed solution is 0.5mol / L, and the concentration of phosphate ions is 1mol / L, the concentration of lithium ions is 0.8mol / L; the mixed solution is placed in a closed pressure vessel for reaction, and the mixed solution is reacted under an inert gas protection atmosphere, the reaction temperature is 140°C, and the reaction pressure is 0.61 MPa, the reaction time is 4h; after the reaction is completed, filter and wash to obtain lithium iron phosphate particles with the first particle diameter; the iron source material is ferrous sulfate, the phosphorus source material is phosphoric acid, and the li...

Embodiment 2

[0050] The preparation of lithium iron phosphate particles with a first particle diameter comprises the following steps:

[0051] Add iron source raw materials, phosphorus source raw materials and lithium source raw materials respectively into the solvent to dissolve and mix to obtain a mixed solution, and the solvent is deionized water; wherein, the concentration of iron ions in the mixed solution is 0.7mol / L, and the concentration of phosphate ions is 1.5mol / L, the concentration of lithium ions is 0.5mol / L; the mixed solution is placed in a closed pressure vessel for reaction, and the mixed solution is reacted under an inert gas protection atmosphere, the reaction temperature is 180°C, and the reaction pressure is 0.58MPa, the reaction time is 2h; after the reaction is completed, filter and wash to obtain lithium iron phosphate particles with the first particle diameter; the iron source material is ferrous sulfate, the phosphorus source material is phosphoric acid, and the li...

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Abstract

The invention provides a preparation method of a positive electrode material structure, a battery positive electrode, a battery and an automobile. The preparation method comprises the steps: obtainingpositive electrode material particles with a first particle diameter and a second particle diameter, wherein the first particle diameter is larger than the second particle diameter; dispersing positive electrode material particles with the first particle diameter and positive electrode material particles with the second particle diameter into a dispersion liquid, and stirring and homogenizing toobtain a mixed slurry; smearing the mixed slurry, and performing drying to obtain a mixture; and calcining the mixture at 300-600 DEG C to obtain the positive electrode material structure. In the above preparation method, large particles and small particles of the positive electrode material are reasonably proportioned by adopting a grading method; according to a positive electrode material structure prepared by the method, the tap density of the positive electrode of the lithium-ion battery can be improved, large pore channels and small pore channels in the positive electrode exist at the same time, and lithium ions are transferred through an electrolyte, so that the charge-discharge rate of the battery is not reduced, and the charge-discharge rate performance of the battery is further guaranteed.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method for preparing a positive electrode material structure, a battery positive electrode, a battery and an automobile. Background technique [0002] With the increasing pressure of energy saving and emission reduction in the automotive industry, pure electric vehicles and hybrid vehicles that use lithium-ion batteries to store / discharge have become a hot spot of attention. An important indicator that affects the energy storage capacity of a lithium-ion battery is the tap density of its positive electrode material. Generally speaking, the higher the tap density, the more positive electrode materials in the same volume, the more energy storage of lithium-ion batteries, and the higher the tap density. It means that the smaller the pores are, it is not conducive to the transmission of lithium ions through the electrolyte, which has a greater impact on the charge and discharge rate of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/505H01M4/525H01M4/58H01M10/05
CPCH01M4/131H01M4/136H01M4/505H01M4/525H01M4/5825H01M10/05H01M2004/021H01M2004/028Y02E60/10
Inventor 张永昌
Owner BAIC GRP ORV CO LTD
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