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Preparation method of positive electrode composite material, positive electrode composite material and secondary battery

A technology of composite materials and positive electrode active materials, applied in the field of secondary batteries, can solve problems such as affecting electrochemical performance, affecting material capacity, and difficult to uniformly disperse conductive agents.

Active Publication Date: 2021-10-19
深圳市博理科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material prepared by the existing synthesis technology method has large particles with a size of tens of microns
Large-sized particles cause poor conductivity of this type of material, which affects the capacity of the material
Although the electrochemical performance of the material can be improved by refining its particle size, it is difficult to uniformly disperse the nano-sized cathode material particles in the conductive agent, which affects its electrochemical performance.

Method used

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  • Preparation method of positive electrode composite material, positive electrode composite material and secondary battery
  • Preparation method of positive electrode composite material, positive electrode composite material and secondary battery
  • Preparation method of positive electrode composite material, positive electrode composite material and secondary battery

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preparation example Construction

[0024] like figure 1 The preparation method of the positive electrode composite material according to one embodiment includes the following steps.

[0025] S10, dissolving the soluble positive electrode active material in water to obtain a soluble positive electrode active material solution.

[0026] Preferably, the soluble positive electrode active material is a molecular cluster ion compound.

[0027] More preferably, in this embodiment, the molecular cluster ion compound has the general formula A 7 [ZV 13 o 38 ] compound, wherein, A is NH 4 , Li, Na or K, Z=Ni, Co or Mn.

[0028] Has the general formula A 7 [ZV 13 o 38 ] compounds can be prepared by the following operations: to AVO 3 Add HNO to the solution 3 、ZSO 4 and K 2 S 2 o 8 Obtain the mixed solution, after heating and evaporating (preferably at 80° C.) to obtain a compound with general formula A 7 [ZV 13 o 38 ]compound of.

[0029] Preferred, AVO 3 The temperature of the solution is 60°C to 90°C (...

Embodiment 1

[0058] 7.18g KVO 3 Dissolve in 180mL deionized water at 80°C, add 4mL 1mol / L HNO 3 , 4mL1mol / L of MnSO 4 and 2.16g of K 2 S 2 o 8 , the mixed solution was stirred at a temperature of 80° C. until the solvent evaporated, and a solid crystal was obtained. The solid crystal has the molecular formula K 7 [MnV 13 o 38 ]compound of. figure 2 K obtained for Example 1 7 [NiV 13 o 38 ] Scanning electron microscope image.

[0059] With the K that 2g embodiment 1 makes 7 [NiV 13 o 38 ] was dissolved in 30mL deionized water, and then 2g of dried powdered carbon black Carbon ECP 600JD was added in a small amount in batches, and the solution was stirred at high speed while adding until all the powdered carbon black was evenly dispersed in the aqueous solution. Then add 60mL of absolute ethanol, and stir the solution, so that the free K that penetrates into the micropores of carbon black + with [NiV 13 o 38 ] 7- It was separated out by reprecipitation. Finally, the solut...

Embodiment 2

[0065] With the K that 2g embodiment 1 makes 7 [NiV 13 o 38 ] was dissolved in 20mL of deionized water, and then 2g of dried powdered carbon black Carbon ECP 600JD was added in a small amount in batches, and the solution was stirred at high speed while adding, until all the powdered carbon black was evenly dispersed in the aqueous solution. Then add 80mL of anhydrous methanol, and stir the solution, so that the free K that penetrates into the micropores of carbon black + with [NiV 13 o 38 ] 7- It was separated out by reprecipitation. Finally, the solution was filtered to obtain the cathode composite material.

[0066] Slurry preparation, coating, drying, rolling, and sheet cutting were performed on the prepared positive electrode composite material and PTFE binder at a mass ratio of 96%:4%, to obtain positive electrode sheets. EC: DMC = 1: 1 (volume ratio) + 1mol / L LiPF 6 It is the electrolyte, and the metal lithium sheet is the negative electrode, which is assembled i...

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Abstract

The invention discloses a preparation method of a positive electrode composite material, the positive electrode composite material and a secondary battery. The preparation method of the positive electrode composite material comprises the following steps of: adding conductive carbon material powder into a soluble positive electrode active material solution, and fully mixing to obtain a first mixed solution; adding an organic solvent which is mutually soluble with water into the first mixed solution to obtain a second mixed solution; and filtering the second mixed solution, and collecting filter residues which are the needed positive electrode composite material. According to the preparation method of the positive electrode composite material, the soluble positive electrode active material is adsorbed by the conductive carbon material powder, and then the soluble positive electrode active material permeating into micropores of the conductive carbon material powder is separated out through the organic solvent which is mutually soluble with water, and therefore, the soluble positive electrode active material forms small particles which are uniformly attached to the conductive carbon material powder, and the positive electrode composite material is obtained.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a method for preparing a positive electrode composite material, a positive electrode composite material prepared by the method for preparing the positive electrode composite material, and a secondary battery including the positive electrode composite material. Background technique [0002] In today's daily life, secondary batteries, especially lithium-ion secondary batteries, have been widely used in mobile phones, notebook computers and other digital products, and are indispensable energy storage devices. At present, the cathode materials used in lithium-ion batteries mainly use lithium-ion intercalation transition metal layered oxides, such as LiCoO 2 , LiMn 2 o 4 Wait. The charge-discharge process of this type of material depends on the orderly insertion and deintercalation of lithium ions in its lattice structure, and the capacity and cycle stability of these m...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCH01M4/485H01M4/625H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 倪尔福骆旎
Owner 深圳市博理科技有限公司
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