High-nickel ternary positive electrode material and preparation method thereof

A technology of positive electrode material and positive electrode active material, which is applied in the field of low surface residual alkali and high nickel positive electrode material and its preparation, and can solve the problems of battery flatulence, coating difficulty, structure collapse and the like

Active Publication Date: 2021-12-31
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure high-nickel ternary positive electrode materials have serious lithium-nickel mixing phenomenon during battery charging and discharging, and the structure will collapse during the cycle; at the same time, the residual alkali content on the surface of high-nickel ternary positive electrode materials is relatively high, generally in the form of carbonic acid Exist in the form of lithium, lithium hydroxide and lithium oxide, resulting in high alkalinity and high water absorption of positive electrode materials
On the one hand, it causes difficulties for th...

Method used

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  • High-nickel ternary positive electrode material and preparation method thereof
  • High-nickel ternary positive electrode material and preparation method thereof
  • High-nickel ternary positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0048] In this embodiment, the synthesis method of the low surface residual alkali and high nickel positive electrode material is as follows:

[0049] S1. Weigh the precursor, lithium hydroxide and nano-oxide for mixing stage

[0050] The hydroxide precursor Ni 0.83 co 0.11 mn 0.06 (OH) 2 (x≥0.8, x+y+z=1) and lithium hydroxide are added to the high-speed mixer according to the molar ratio of the sum of the moles of nickel, cobalt, manganese and lithium element at 1:1.05, and then add nickel, cobalt, manganese and three Nano-zirconia with a total mass of 2000ppm of the three metals and nano-yttrium oxide with a total mass of 2000ppm of the three metals of nickel, cobalt and manganese are uniformly mixed in a high-speed mixer. Mixing conditions: rotating speed 2000rpm, mixing materials for 20 minutes, to obtain a uniform primary mixture.

[0051] The average particle diameter of the nano oxide raw material is 100nm to 500nm;

[0052] S2. Primary sintering stage of precurso...

Embodiment 2

[0061] The difference between this embodiment and embodiment 1 is that the molar ratio of the lithium element to the total amount of nickel, cobalt and manganese elements in step S1 is 1.0, and other conditions and parameters are exactly the same as in embodiment 1.

Embodiment 3

[0063] The difference between this example and Example 1 is that the molar ratio of the lithium element to the total amount of nickel, cobalt, and manganese elements in step S1 is 1.1:1, and other conditions and parameters are exactly the same as those in Example 1.

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Abstract

The invention relates to a high-nickel ternary positive electrode material and a preparation method thereof. The high-nickel ternary positive electrode material comprises a positive electrode active material and a coating layer, and the positive electrode active material comprises a nano oxide; the nano oxide comprises any one or more of zirconium oxide, titanium oxide, tungsten oxide, molybdenum oxide, aluminum oxide and yttrium oxide; the coating layer comprises lithium zirconate, lithium titanate and lithium cobalt oxide. According to the ternary positive electrode material and the preparation method thereof provided by the invention, residual alkali on the surface of the high-nickel positive electrode material is reduced, the electronic conductivity of the material is increased, and gas production and cycle stability in the cycle process of the positive electrode material are improved.

Description

technical field [0001] This article relates to but not limited to the technical field of lithium batteries, in particular to but not limited to a low surface residual alkali and high nickel positive electrode material and a preparation method thereof. Background technique [0002] Low-cost, high-energy-density and low-toxicity high-nickel ternary nickel-cobalt lithium manganate (NCM) cathode materials or nickel-cobalt-aluminate (NCA) cathode materials are widely used in the field of new energy vehicles. However, pure high-nickel ternary positive electrode materials have serious lithium-nickel mixing phenomenon during battery charging and discharging, and the structure will collapse during the cycle; at the same time, the residual alkali content on the surface of high-nickel ternary positive electrode materials is relatively high, generally in the form of carbonic acid Lithium, lithium hydroxide and lithium oxide exist in the form of lithium, which leads to high alkalinity an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01G23/00C01G25/00C01G51/00C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525C01G53/50C01G51/42C01G23/005C01G25/00C01P2004/03C01P2004/84C01P2004/62H01M2004/021H01M2004/028Y02E60/10
Inventor 马加力张树涛王壮王亚州白艳
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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