A kind of preparation method of lithium ion battery

A lithium-ion battery and nickel foam technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor fast charge and discharge performance, unsatisfactory high current discharge performance, high internal impedance, etc., to improve conductivity, High tap density and quality improvement effect

Active Publication Date: 2019-10-29
安徽力源新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Of course, lithium-ion batteries also have some disadvantages, such as poor fast charge and discharge performance, unsatisfactory high-current discharge performance, and high internal impedance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for a lithium ion battery, comprising the following steps:

[0030] (1) Soak the nickel foam in 30% nitric acid aqueous solution for 5 minutes as a conductive current collector, dissolve the iron source, phosphorus source, and glucose in water to make a mixed solution A, add polyphosphate, and mix evenly to make a mixed solution B , Dissolve the precipitant in water to prepare a precipitant solution, add nickel foam into the reactor, then add the mixed solution B and the precipitant solution into the reactor at the same time, coprecipitate for 3-7 hours, and wash the obtained product Obtain iron-phosphorus precursor after drying; Wherein, the addition amount of polyphosphate is 5% of total weight of phosphorus source, iron source and glucose; / Hour;

[0031] (2) After mixing and grinding the iron-phosphorus precursor and lithium hydroxide prepared above, sintering at 720 ° C for 100 min, pressing and slicing to obtain LiFePO 4 Positive plate;

[00...

Embodiment 2

[0037] A preparation method for a lithium ion battery, comprising the following steps:

[0038] (1) Soak the nickel foam in 30% nitric acid aqueous solution for 5 minutes as a conductive current collector, dissolve the iron source, phosphorus source, and glucose in water to make a mixed solution A, add polyphosphate, and mix evenly to make a mixed solution B , Dissolve the precipitant in water to prepare a precipitant solution, add nickel foam into the reactor, then add the mixed solution B and the precipitant solution into the reactor at the same time, coprecipitate for 3-7 hours, and wash the obtained product Obtain iron-phosphorus precursor after drying; Wherein, the addition amount of polyphosphate is 10% of total weight of phosphorus source, iron source and glucose; / Hour;

[0039] (2) After mixing and grinding the iron-phosphorus precursor and lithium hydroxide prepared above, sintering at 960°C for 30min, pressing and slicing to obtain LiFePO 4 Positive plate;

[004...

Embodiment 3

[0045] A preparation method for a lithium ion battery, comprising the following steps:

[0046] (1) Soak the nickel foam in 30% nitric acid aqueous solution for 5 minutes as a conductive current collector, dissolve the iron source, phosphorus source, and glucose in water to make a mixed solution A, add polyphosphate, and mix evenly to make a mixed solution B , Dissolve the precipitant in water to prepare a precipitant solution, add nickel foam into the reactor, then add the mixed solution B and the precipitant solution into the reactor at the same time, coprecipitate for 3-7 hours, and wash the obtained product Obtain iron-phosphorus precursor after drying; Wherein, the addition amount of polyphosphate is 7% of total weight of phosphorus source, iron source and glucose; / Hour;

[0047] (2) After mixing and grinding the iron-phosphorus precursor and lithium hydroxide prepared above, sintering at 750°C for 120min, pressing and slicing to obtain LiFePO 4 Positive plate;

[004...

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Abstract

The invention discloses a preparation method of a lithium ion battery. The specific process is as follows: firstly, a carbon-coated lithium iron phosphate positive plate is prepared by using a co-precipitation method and using foamed nickel as a substrate; then, using the foamed nickel as a substrate, growing Co 3 o 4 Nanowire arrays, and using the method of constant voltage electrodeposition on Co 3 o 4 A silicon layer is deposited on the surface of the nanowire array, and a carbon layer is sprayed on the surface of the silicon layer to obtain a negative electrode sheet. Finally, the positive electrode sheet, separator, and negative electrode sheet are stacked in sequence to make a roll core, which is sealed in the battery case and injected with electrolyte. charging, aging, and formation to produce a lithium-ion battery. The lithium-ion battery produced by the method has high energy density, high power, good cycle performance, and low preparation cost.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to a preparation method of a lithium ion battery. Background technique [0002] In the 21st century, under the macro background of world energy shortage and environmental pollution, many countries have taken the development of new energy (wind energy, water energy, ocean energy and solar energy, etc.) Development goals, but the electric energy storage technology represented by lithium batteries restricts the application of new energy sources. Therefore, the preparation of large-capacity, low-cost, long-life and safe lithium-ion batteries is the focus of the current lithium-ion battery industry development. [0003] Lithium batteries mainly rely on Li + It works by intercalation and deintercalation between positive and negative active materials. When charging, Li + Deintercalation from the active compound of the positive electrode, through the electrolyte and the diaphragm, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0583H01M4/36H01M4/38H01M4/52H01M4/58H01M4/62H01M4/66H01M4/80H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/523H01M4/5825H01M4/625H01M4/628H01M4/661H01M4/808H01M10/0525H01M10/0583Y02E60/10Y02P70/50
Inventor 章明耀
Owner 安徽力源新能源有限公司
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