Quaternary polycrystalline positive electrode material, and preparation method and application thereof

A technology of positive electrode materials and positive electrode sheets, which is applied in the field of quaternary polycrystalline positive electrode materials and its preparation, can solve the problems of cycle performance and rate performance deterioration, poor cycle performance and rate performance, etc.

Inactive Publication Date: 2021-04-23
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its Li + /Ni 2+ The cation shuffling effect will also lead to the deterioration of cycle performance and rate performance
[0006] The above schemes have problems such...

Method used

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  • Quaternary polycrystalline positive electrode material, and preparation method and application thereof
  • Quaternary polycrystalline positive electrode material, and preparation method and application thereof
  • Quaternary polycrystalline positive electrode material, and preparation method and application thereof

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Embodiment 1

[0043] This embodiment provides a quaternary polycrystalline cathode material, the specific preparation method is as follows:

[0044] (1) Pre-burn nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=88:6:3:3) in an ordinary box-type furnace at 450°C in an air atmosphere for 8 hours, then cool, pulverize and Sieve to obtain nickel-cobalt-manganese-aluminum oxide;

[0045] (2) Dry-mix the nickel-cobalt-manganese-aluminum oxide obtained in step (1) with LiOH, selenium oxide and calcium oxide according to a molar ratio of 1:1.025:0.001:0.001 in a mixer, and dry mix The materials were calcined in an ordinary box furnace at 700° C. in an oxygen atmosphere for 8 hours, cooled, crushed and sieved to obtain the quaternary polycrystalline positive electrode material.

[0046] The first charge and discharge curve of the quaternary polycrystalline positive electrode material is as follows figure 1 shown.

[0047] The cycle capacity retention curve of the quaternary po...

Embodiment 2

[0049] This embodiment provides a quaternary polycrystalline cathode material, the specific preparation method is as follows:

[0050] (1) After pre-burning nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=88:6:3:3) in an ordinary box-type furnace at 300°C in an air atmosphere for 7 hours, cool, pulverize and Sieve to obtain nickel-cobalt-manganese-aluminum oxide;

[0051] (2) Dry-mix the nickel-cobalt-manganese-aluminum oxide obtained in step (1) with lithium carbonate, selenium oxide and calcium oxide according to a molar ratio of 1:1.2:0.001:0.001 in a mixer, and dry mix The final material was calcined in an ordinary box furnace at 750° C. in an oxygen atmosphere for 6.5 hours, then cooled, crushed and sieved to obtain the quaternary polycrystalline positive electrode material.

Embodiment 3

[0053] The only difference between this embodiment and embodiment 1 is that the pre-burning temperature in step (1) is 150° C., and other conditions and parameters are exactly the same as those in embodiment 1.

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Abstract

The invention provides a quaternary polycrystalline positive electrode material, and a preparation method and application thereof. The positive electrode material comprises a main body and a doping agent, the doping agent is uniformly doped into the main body, the chemical general formula of the main body is LiNixCoyMnzAl(1-x-y-z)O2, the doping agent comprises selenium oxide and calcium oxide, and Se/Ca is uniformly doped into the main body of the material, so the layered positive electrode material has characteristics of enhanced structure stability, reduced Li<+>/Ni<2+> cation mixing effect, inhibition of the oxidation process from O<2-> to O2, and obstruction of the phase change of the material from layering to spinel to a certain extent so as to improve the electrochemical performance of the positive electrode material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a quaternary polycrystalline positive electrode material and a preparation method and application thereof. Background technique [0002] With the wide application of lithium-ion batteries in mobile phones, computers, automobiles, energy storage and other fields, people have higher and higher demands on the safety, energy density and cycle stability of batteries. The most representative of such batteries are lithium secondary batteries (LIBs) in which electrical energy is generated by changing the chemical potential of lithium ions in the positive and negative electrodes during intercalation and deintercalation. Cathode materials have a direct and dominant effect on the performance of LIBs, so many researchers are committed to realizing a cathode material with large capacity, fast charge / discharge speed, and long cycle life that can perform reversible intercalation and deinterca...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/62H01M4/131H01M10/0525C01G53/00
CPCY02E60/10
Inventor 王壮张树涛潘海龙王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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