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Preparation method of positive plate of lithium ion secondary battery for smart home

A secondary battery and smart home technology, applied in battery electrodes, positive electrodes, active material electrodes, etc., can solve the problems of reduced density of lithium iron phosphate active materials, inability to improve ionic conductivity, and inability to guarantee battery capacity performance, etc., to achieve Shorten the path of lithium ion transmission, which is beneficial to the high rate charge and discharge performance and the effect of complete crystal structure

Inactive Publication Date: 2018-05-15
BEIJING UNISROBO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it can only improve electronic conductivity, not ionic conductivity
In the prior art, lithium iron phosphate materials with a porous structure are prepared to improve the conductivity of lithium ions, but the porous structure leads to a decrease in the density of the lithium iron phosphate active material in the positive electrode sheet, which cannot guarantee the capacity performance of the battery

Method used

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  • Preparation method of positive plate of lithium ion secondary battery for smart home

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] Embodiment 1: A method for preparing a positive electrode sheet of a lithium-ion secondary battery for a smart home, such as figure 1 shown, including the following steps:

[0038] (1) Prepare H with a concentration of 0.5mol / L 3 PO 4 solution, FeSO with a concentration of 0.5mol / L 4 solution and 1mol / L ammonia solution;

[0039] (2) put H 3 PO 4 Solution and ammonia solution were added dropwise to FeSO 4 solution, where FeSO 4 、H 3 PO 4 The molar ratio with ammonia water is 1.0:1.0:1.0, and the reaction is carried out under ultrasonic stirring. Ultrasonic conditions: temperature 50°C, frequency 25KHz, adjust the pH value of the reaction at 2.1, after the reaction is completed, keep warm for 3 hours, and filter the precipitate , washing, and drying in a vacuum oven at 80°C for 8 hours to obtain the precursor ferrous ammonium phosphate;

[0040] (3) Mix the precursor ferrous ammonium phosphate, LiOH, sucrose and purified water by ball milling. The molar ratio o...

Embodiment approach 2

[0047] Embodiment 2: A method for preparing a positive electrode sheet of a lithium-ion secondary battery for a smart home, such as figure 1 shown, including the following steps:

[0048] (1) Prepare H with a concentration of 0.8mol / L 3 PO 4 solution, FeSO with a concentration of 0.8mol / L 4 solution and 1.2mol / L ammonia solution;

[0049] (2) put H 3 PO 4 Solution and ammonia solution were added dropwise to FeSO 4 solution, where FeSO 4 、H 3 PO 4 The molar ratio with ammonia water is 1.0:1.0:1.2, and the reaction is carried out under ultrasonic stirring. Ultrasonic conditions: temperature 50°C, frequency 25KHz, adjust the pH value of the reaction to 2.1, after the reaction is completed, keep warm for 4 hours, and filter the precipitate , washing, and drying in a vacuum oven at 100°C for 8 hours to obtain the precursor ferrous ammonium phosphate;

[0050] (3) Mix the precursor ferrous ammonium phosphate, LiOH, sucrose and purified water by ball milling. The molar rati...

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Abstract

The invention relates to a preparation method of a positive plate of a lithium ion secondary battery for smart home. The method comprises the following steps: a 0.5mol / L H3PO4 solution, a 0.5mol / L FeSO4 solution and 1mol / L ammoniacal liquor are prepared; the H3PO4 solution and the ammoniacal liquor are added into the FeSO4 solution dropwisely; a precursor ferrous ammonium phosphate, LiOH, sucroseand purified water are mixed with ball milling; under the protection of a hydrogen and nitrogen gas mixture at 600 DEG C, high temperature treatment is carried out; ammonium dihydrogen phosphate, ferrous sulphate and lithium carbonate are mixed according to a mol ratio; three dimensional porous spherical lithium iron phosphate / a carbon cathode material A and a lithium iron phosphate cathode material B are mixed in order to obtain a mixture A and a mixture B; the mixture A and the mixture B and an aqueous solvent are mixed, in order to form slurry A and slurry B; the slurry A and the slurry B are coated on an aluminium foil current collector; the materials are dried in a vacuum drying box. The technical scheme is good for improving capacity and cycle performance of the cathode material, inorder to obtain higher capacity and lower resistance, and better safety.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a method for preparing a positive plate of a lithium-ion secondary battery for smart homes. Background technique [0002] Many smart homes need to use energy storage batteries to provide power for them. As a new type of energy storage battery, lithium-ion batteries have the advantages of high energy density and no memory effect, and are ideal smart home power supplies. Lithium iron phosphate is a new type of lithium ion battery cathode material, which has good safety, but lithium iron phosphate has the defect of poor conductivity. Carbon coating is commonly used in the field to improve the conductivity of lithium iron phosphate. But it can only improve electronic conductivity, not ion conductivity. In the prior art, the conductivity of lithium ions is improved by preparing lithium iron phosphate materials with a porous structure, but the porous structure leads to a decrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/58H01M4/62
CPCH01M4/1397H01M4/5825H01M4/625H01M2004/021H01M2004/028Y02E60/10
Inventor 刘雪楠沈刚
Owner BEIJING UNISROBO TECH CO LTD