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A kind of positive electrode material with core-shell structure, its preparation method and application in lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of unstable structure of lithium-ion battery positive electrode materials, achieve improved electrochemical performance, high electrical conductivity and mechanical strength, The effect of high mechanical strength

Active Publication Date: 2021-05-28
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the lithium ion battery cathode material structure that described method obtains is unstable

Method used

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  • A kind of positive electrode material with core-shell structure, its preparation method and application in lithium ion battery

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Embodiment 1

[0054] (1) Glucose, metal salt (nickel sulfate, cobalt sulfate and manganese sulfate molar ratio is 8:1:1) and water are mixed, and the mol ratio of described glucose and metal salt is 1:1.4, and the mol ratio of described glucose and water Mass ratio is 8:100, obtains mixed material;

[0055] (2) Mix the mixed material, polyvinylpyrrolidone and ammonia water, the mass ratio of the mixed material and polyvinylpyrrolidone is 10:1, the pH value of the material obtained after mixing is 11, and the hydrothermal reaction is carried out, and the temperature is changed by The room temperature was raised to 80°C and kept for 10 hours, then raised to 180°C and kept for 10 hours to obtain the reaction precursor;

[0056] (3) Mix the reaction precursor with lithium hydroxide, the molar ratio of the reaction precursor to lithium hydroxide is 1:1.05, the atmosphere is argon, and the temperature is 900 ° C for 12 hours to sinter to obtain a diameter of 300 nm, A core-shell positive electro...

Embodiment 2

[0058] (1) Glucose, metal salt (nickel sulfate, cobalt sulfate and manganese sulfate molar ratio is 8:1:1) and water are mixed, and the mol ratio of described glucose and metal salt is 1:2, and the mol ratio of described glucose and water Mass ratio is 5:100, obtains mixed material;

[0059] (2) mixing the mixed material, citric acid and ammonia water, the mass ratio of the mixed material and citric acid is 12:1, the pH value of the material obtained after mixing is 10.5 (adjusted by ammonia water), and the hydrothermal reaction is carried out, Raise the temperature from room temperature to 100°C, keep it warm for 5 hours, then raise it to 240°C, keep it warm for 4 hours, and obtain the reaction precursor;

[0060] (3) Mix the reaction precursor with lithium hydroxide, the molar ratio of the reaction precursor to lithium hydroxide is 1:1.08, the atmosphere is argon, and the temperature is 850 ° C for 14 hours to sinter to obtain a diameter of 350 nm, A core-shell positive ele...

Embodiment 3

[0062] (1) Glucose, metal salt (nickel sulfate, cobalt sulfate and manganese sulfate molar ratio is 8:1:1) and water are mixed, and the mol ratio of described glucose and metal salt is 1:1, and the mol ratio of described glucose and water Mass ratio is 10:100, obtains mixed material;

[0063] (2) the mixed material, sodium lauryl sulfate and ammoniacal liquor are mixed, and the mass ratio of described mixed material and sodium lauryl sulfate is 8:1, and the material pH value that obtains after mixing is 11.5 (using ammoniacal liquor Adjustment), carry out hydrothermal reaction, raise the temperature from room temperature to 60°C, keep it for 18h, then raise it to 160°C, keep it for 8h, and get the reaction precursor;

[0064] (3) Mix the reaction precursor with lithium hydroxide, the molar ratio of the reaction precursor to lithium hydroxide is 1:1.1, the atmosphere is argon, and the temperature is 950 ° C for 10 hours to obtain a diameter of 400nm. A core-shell positive elec...

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Abstract

The invention discloses a positive electrode material with a core-shell structure, a preparation method thereof and an application in a lithium ion battery. The positive electrode material with a core-shell structure includes a carbon coating layer, and an active material core located in the carbon coating layer, and the number of the active material cores is at least two. The positive electrode material of the present invention has a core-shell structure, which can completely cover the material to form a three-dimensional structure, and can alleviate the structural collapse caused by the volume change in the process of material deintercalation of lithium; and at least two spheres composed of active material cores The structure has a certain space to accommodate more electrolyte, which improves the liquid retention capacity, and also has the advantages of high electrical conductivity and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a positive electrode material with a core-shell structure, a preparation method thereof and an application in a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely developed and utilized due to their advantages such as high working voltage, high energy density, long cycle life, small self-discharge and no memory effect. power source. [0003] The main structure of lithium ion battery is positive electrode material, negative electrode material, electrolyte and diaphragm. At present, the commonly used carbon coating method for lithium battery cathode materials is to mix the precursor with lithium and carbon, mix them evenly by ball milling, and then sinter them in an atmosphere furnace under inert gas protection conditions. This method is an ex-situ coating method. , the material cannot be completely covered, even the su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525C01G53/00C01B32/15
CPCC01G53/44C01P2004/80C01B32/15H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王强侯桃丽乔亚非杨子锐胡哲刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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