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Modified ternary positive electrode material as well as preparation method and application thereof

A positive electrode material and modification technology, applied in electrode manufacturing, chemical instruments and methods, electrical components, etc., can solve the loss of ternary material capacity and cycle performance, affect cycle performance, safety performance, Li/Ni cation mixing, etc. problems, achieving good cycle stability and interface behavior, inhibiting cation mixing, and high electrochemical reactivity

Pending Publication Date: 2022-04-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the Ni content of NCM622 is relatively high, and its synthesis difficulty is further increased, while Ni 2+ radius with Li + radius Very close, it is easy to cause Li / Ni cations to mix, resulting in a decrease in gram capacity and cycle performance, which is difficult to reverse; secondly, with the increase of Ni content, the Ni in the material 3+ The proportion of Ni also increases accordingly, and Ni 3+ Very unstable, exposed to the air very easily with moisture and CO in the air 2 The reaction generates surface residual alkali, which leads to the loss of capacity and cycle performance of ternary materials; and too much surface residual alkali will cause serious gas production of ternary batteries, affecting its cycle performance and safety performance, etc.

Method used

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  • Modified ternary positive electrode material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, the modified ternary cathode material is Cu 0.8 Ni 0.2 GaTe 2 Coating modified cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 , and its specific preparation steps are as follows:

[0047] According to the element molar ratio of Cu:Ni:Ga:Te is 0.8:0.2:1:2, respectively weigh copper powder, nickel powder, gallium powder, tellurium powder, and disperse in absolute ethanol to obtain a solid content of 30%. the mixture one;

[0048] The obtained mixed solution was ball milled at 200rpm for 1h, dried at 90°C for 1h, and then calcined at 300°C for 6h to obtain Cu 0.8 Ni 0.2 GaTe 2 Precursor;

[0049] According to Li:Ni:Co:Mn element molar ratio is 1.01:0.6:0.2:0.2, respectively weigh lithium carbonate, nickel sulfate, cobalt sulfate, manganese sulfate, and disperse in dehydrated ethanol to obtain a solid content of 30% The mixture two;

[0050] Will Cu 0.8 Ni 0.2 GaTe 2 The precursor was added to the mixed solution 2 (Cu 0.8 Ni 0.2 GaTe 2 The...

Embodiment 2

[0052] In this embodiment, the modified ternary cathode material is Cu 0.85 Ni 0.15 GaTe 2 Coating modified cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 , and its specific preparation steps are as follows:

[0053] According to the element molar ratio of Cu:Ni:Ga:Te is 0.85:0.15:1:2, copper chloride, nickel sulfate, gallium powder, tellurium powder were weighed respectively, and dispersed in absolute ethanol to obtain a solid content of 35 % of mixed solution one;

[0054] Disperse the mixed solution by ball milling at 250rpm for 5h, dry at 95°C for 2h, and pre-calcine at 400°C for 8h to obtain Cu 0.85 Ni 0.15 GaTe 2 Precursor;

[0055] According to Li:Ni:Co:Mn element molar ratio is 1.01:0.6:0.2:0.2, respectively weigh lithium hydroxide, nickel chloride, cobalt sulfate, manganese chloride, and disperse in dehydrated ethanol to obtain the solid content 38% mixed solution II;

[0056] Will Cu 0.85 Ni 0.15 GaTe 2 The precursor was added to the mixed solution 2 (the...

Embodiment 3

[0058] In this example, the modified ternary cathode material is Cu 0.9 Ni 0.1 GaTe 2 Coating modified cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 , and its specific preparation steps are as follows:

[0059] According to the elemental molar ratio of Cu:Ni:Ga:Te is 0.9:1:1:2, copper powder, nickel chloride, gallium powder, tellurium powder were weighed respectively, and dispersed in absolute ethanol to obtain a solid content of 45 % of mixed solution one;

[0060] Disperse the obtained mixture by ball milling at 300rpm for 5h, dry at 100°C for 2h, and pre-calcine at 500°C for 10h to obtain Cu 0.9 Ni 0.1 GaTe 2 Precursor;

[0061] Press Li:Ni:Co:Mn element molar ratio is 1.01:0.6:0.2:0.2, take lithium chloride, nickel chloride, cobalt sulfate, manganese nitrate respectively, and disperse in dehydrated alcohol, obtain solid content as 40% mixture II;

[0062] Will Cu 0.9 Ni 0.1 GaTe 2 The precursor was added to the mixed solution 2 (the mass ratio of the two was 0.0...

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Abstract

The invention discloses a modified ternary positive electrode material and a preparation method and application thereof, and the modified ternary positive electrode material comprises a base material which is a positive electrode material LiNi0. 6Co0. 2Mn0. 2O2; the coating material is formed on the surface of the base material, the coating material covers the surface of the base material, the composition of the coating material is CuxNi1-xGaTe2, and x is larger than or equal to 0.8 and smaller than or equal to 0.99. The modified ternary positive electrode material can effectively reduce surface moisture and residual alkali of NCM622, the CuxNi1-xGaTe2 coating layer enhances the structural stability of the NCM622 material, and the high-temperature cycle performance and safety of a lithium ion battery prepared from the modified ternary positive electrode material are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a modified ternary positive electrode material and a preparation method thereof, and also relates to the application of the modified ternary positive electrode material in preparing lithium ion batteries. Background technique [0002] Compared with traditional lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have the characteristics of high specific capacity, high working voltage, cycle stability and environmental friendliness, and are developing rapidly. [0003] As one of the key materials of lithium-ion batteries, cathode materials have an important impact on the performance of lithium-ion batteries. Nickel-cobalt-manganese ternary material (NCM) is currently the most promising cathode material for lithium-ion batteries. It has the advantages of lithium manganese oxide, lithium cobalt oxide and li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M10/0525H01M4/36H01M4/38H01M4/525H01M4/505H01M4/04
CPCY02E60/10
Inventor 刘兴亮杨茂萍汪伟伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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