High-rate stable lithium nickel phosphate positive electrode material and preparation method thereof

A lithium nickel phosphate and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of poor ion conductivity, poor high-rate stability, easy structure distortion and cracking, etc., and achieve low cost, simple process, excellent ion conductivity and The effect of conductivity

Inactive Publication Date: 2019-04-05
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the lithium nickel phosphate positive electrode material used in lithium ion batteries in the prior art is prone to distortion and cracking in its structure, and has defects such as poor ion conductivity and poor stability at high rates.

Method used

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  • High-rate stable lithium nickel phosphate positive electrode material and preparation method thereof

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Effect test

Embodiment 1

[0032]Put the ITO conductive glass into acetone, ethanol, and deionized water successively at room temperature, and ultrasonically treat them for 5 minutes respectively, and then put them into an electric constant temperature drying oven, and dry them at 50°C for 2 hours; The mixed solution of trisodium citrate hydrate, 1.50mL of n-propanol and 17.70mL of deionized water was left to stand for 50min to obtain the electrolyte; connected to the three-electrode system, the working electrode was made of ITO conductive glass, and the reference electrode was made of Ag|AgCl. Select a platinum sheet for the counter electrode, add the prepared electrolyte to the electrolytic cell, apply a voltage of -0.3V to the working electrode with an electrochemical workstation, and last for 300s, a layer of reddish-brown substance is formed on the ITO conductive glass, stop applying After voltage, remove the ITO conductive glass from the working electrode, wash off the electrolyte on the surface wi...

Embodiment 2

[0038] Put the ITO conductive glass into acetone, ethanol, and deionized water successively at room temperature, and ultrasonically treat them for 5 minutes respectively, and then put them into an electric constant temperature drying oven, and dry them at 50°C for 2 hours; The mixed solution of trisodium citrate hydrate, 1.50mL of n-propanol and 17.70mL of deionized water was left to stand for 40min to obtain the electrolyte; connected to the three-electrode system, the working electrode was made of ITO conductive glass, and the reference electrode was made of Ag|AgCl. Select a platinum sheet for the counter electrode, add the prepared electrolyte to the electrolytic cell, apply a voltage of -0.3V to the working electrode with an electrochemical workstation, and last for 300s, a layer of reddish-brown substance is formed on the ITO conductive glass, stop applying After voltage, remove the ITO conductive glass from the working electrode, wash off the electrolyte on the surface w...

Embodiment 3

[0041] Put the ITO conductive glass into acetone, ethanol, and deionized water successively at room temperature, and ultrasonically treat them for 5 minutes respectively, and then put them into an electric constant temperature drying oven, and dry them at 50°C for 2 hours; The mixed solution of trisodium citrate hydrate, 1.50mL of n-propanol and 17.70mL of deionized water was left to stand for 50min to obtain the electrolyte; connected to the three-electrode system, the working electrode was made of ITO conductive glass, and the reference electrode was made of Ag|AgCl. Select a platinum sheet for the counter electrode, add the prepared electrolyte to the electrolytic cell, apply a voltage of -0.3V to the working electrode with an electrochemical workstation, and last for 300s, a layer of reddish-brown substance is formed on the ITO conductive glass, stop applying After voltage, remove the ITO conductive glass from the working electrode, wash off the electrolyte on the surface w...

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Abstract

The invention belongs to the technical field of lithium-ion batteries and provides a high-rate stable lithium nickel phosphate positive electrode material and a preparation method thereof. The methodcomprises the steps of preparing a layered copper nanosheet as a framework, synthesizing a pre-packed nano-scale lithium nickel phosphate precursor with uniform particle through a hydrothermal method,fixing the lithium nickel phosphate precursor in the layered copper nanosheet layer and the framework, and burning to obtain the high-rate layered lithium nickel phosphate positive electrode material. Compared with a traditional method, the method of the invention has the advantages that the prepared lithium nickel phosphate positive electrode material has good stability at a high rate, excellentcharge and discharge performance and excellent ionic conductivity and electrical conductivity, the preparation method is simple, raw materials are easy to obtain, the cost is low, and the high-rate stable lithium nickel phosphate positive electrode material can be widely used in the field of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries and provides a high-rate and stable lithium nickel phosphate cathode material and a preparation method. Background technique [0002] Lithium-ion batteries have become extremely popular secondary batteries today. The future development direction of lithium-ion batteries is high energy density, high cycle life, and high safety performance. Among them, the lithium iron phosphate battery has a long cycle life and good safety performance. It is already the main choice of power batteries in the Chinese market. However, the discharge voltage platform of the lithium iron phosphate battery is only 3.2V, and the energy density of the battery is only 90~120Wh / Kg, which has gradually been exposed. Its bulky, heavy quality problems. Cathode materials are key components of lithium-ion batteries. [0003] Among the current lithium battery cathode materials, lithium nickel phosphate, as an emerg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/366H01M4/5825H01M4/625H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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