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Ultrahigh nickel single-crystal positive electrode material and preparation method thereof

A positive electrode material and single crystal-like technology, which is applied in the field of ultra-high nickel single crystal positive electrode material and its preparation, can solve the problems of difficult preparation, high see content, serious nickel precipitation, etc., and achieve simple preparation process, high particle strength, Effect of Reducing Residual Alkali Content

Pending Publication Date: 2021-12-24
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the difficulties in the preparation of ultra-high nickel-based single-crystal positive electrode materials in the prior art, which easily lead to defects such as high content of nickel and severe nickel precipitation, thereby providing an ultra-high-nickel single-crystal positive electrode Materials and their preparation methods

Method used

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  • Ultrahigh nickel single-crystal positive electrode material and preparation method thereof
  • Ultrahigh nickel single-crystal positive electrode material and preparation method thereof
  • Ultrahigh nickel single-crystal positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] This embodiment provides an ultra-high nickel-based single crystal positive electrode material, and the specific preparation steps are as follows:

[0035] (1) 100g of nickel-cobalt-manganese-aluminum hydroxide (wherein the molar ratio of metal elements: Ni:Co:Mn:Al=90:7:2:1, the same below) is placed in an ultracentrifugal grinder, at a pressure of 1MPa, Stir at 10000r / min for 45 minutes.

[0036] (2) LiOH, strontium carbonate and nickel cobalt manganese aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=90:7:2:1) according to the molar ratio of 1.025:0.001:1 (Li / Metal= 1.025, Sr / Metal=0.001, the same below) was poured into an ultracentrifugal grinder, and the rotation speed was adjusted to 7000r / min to continue stirring for 45 minutes.

[0037] (3) Finally, the mixed material was calcined in an ordinary box-type furnace at 750° C. in an oxygen atmosphere with a purity of 98% for 8 hours, then cooled, crushed and passed through a 300-mesh sieve to obtain an ultra-high nicke...

Embodiment 2

[0040] This embodiment provides an ultra-high nickel-based single crystal positive electrode material, and the specific preparation steps are as follows:

[0041] (1) Put 100g of nickel-cobalt-manganese-aluminum hydroxide (the molar ratio of metal elements: Ni:Co:Mn:Al=90:7:2:1) in an ultracentrifugal grinder, at a pressure of 0.5MPa, 10000r / min stirring for 45 minutes.

[0042](2) LiOH, strontium carbonate and nickel cobalt manganese aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=90:7:2:1) according to the molar ratio of 1.05:0.001:1 (Li / Metal= 1.05, Sr / Metal=0.001) was poured into an ultracentrifugal grinder, and the rotating speed was adjusted to 7000r / min to continue stirring for 45 minutes.

[0043] (3) Finally, the mixed material was calcined in an ordinary box-type furnace at 750° C. in an oxygen atmosphere with a purity of 98% for 8 hours, then cooled, crushed and passed through a 300-mesh sieve to obtain an ultra-high nickel single crystal positive electrode material....

Embodiment 3

[0045] This embodiment provides an ultra-high nickel-based single crystal positive electrode material, and the specific preparation steps are as follows:

[0046] (1) Put 100g of nickel-cobalt-manganese-aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=90:7:2:1) in an ultracentrifugal grinder, stir at 1.5MPa, 10000r / min for 45 minute.

[0047] (2) LiOH, strontium carbonate and nickel cobalt manganese aluminum hydroxide (molar ratio: Ni:Co:Mn:Al=90:7:2:1) according to the molar ratio of 1:0.001:1 (Li / Metal= 1) Pour into an ultracentrifugal grinder, adjust the speed to 7000r / min and continue stirring for 45 minutes.

[0048] (3) Finally, the mixed material was calcined in an ordinary box-type furnace at 750° C. in an oxygen atmosphere with a purity of 98% for 8 hours, then cooled, crushed and passed through a 300-mesh sieve to obtain an ultra-high nickel single crystal positive electrode material.

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode material preparation, and particularly relates to an ultrahigh nickel single crystal positive electrode material and a preparation method thereof. According to the invention, an ultrahigh nickel positive electrode material precursor (nickel-cobalt-manganese-aluminum hydroxide) is used as a matrix raw material, the precursor is fully crushed by using the acting force of high rotating speed and high pressure, and a lithium source and strontium carbonate are added during the period, so that the lithium source and the precursor are promoted to be mutually dissolved and then crystallized and co-grown at a relatively low temperature, the lithium-nickel mixing is reduced, and finally, calcining is performed to obtain the single-crystal-like material. The monocrystal-like material provided by the invention is uniform in size and high in particle strength, and the cycling stability of the material is enhanced. The technical problems that due to the fact that the nickel content in the ultrahigh nickel material is high, nickel in generated mono-like crystals is severely separated out due to high-temperature calcination, the later battery capacity fades, the residual alkali content is high and the like in the preparation process of the ultrahigh nickel mono-like materials are solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to an ultra-high nickel single crystal positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the most widely used electrochemical power source at present. The most representative of this kind of battery is the lithium secondary battery that generates electric energy due to the change of chemical potential of lithium ions in the positive and negative electrodes when intercalation and deintercalation. (LIBs). 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 deintercalation of lithium ions. [0003] Currently, ultra-high nickel mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525
CPCH01M4/362H01M4/502H01M4/505H01M4/523H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王壮张树涛李子郯白艳王亚州马加力
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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