High-nickel positive electrode material for non-aqueous electrolyte secondary battery and preparation method for high-nickel positive electrode material

A non-aqueous electrolyte and positive electrode material technology, which is applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problem of poor contact between materials and conductive agents and binders, poor consideration of small particle sizes and electrolyte reactions, and increased Problems such as large material and electrolyte interface area can improve electrochemical performance, reduce lithium-nickel mixed discharge, improve cycle performance and rate performance

Active Publication Date: 2019-05-28
郑州中科新兴产业技术研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the high nickel content of high nickel-based positive electrode materials, the radius of lithium ions with the radius of nickel It is relatively close, and it is easy to produce mixed lithium and nickel, which affects the structural stability of the material, and then affects its electrochemical performance; the particle size distribution of high-nickel cathode materials on the market is mostly normal distribution, and the vibration The solid density is low, and the compaction density of the pole piece is low. When the pole piece is rolled, it is easy to cause the secondary particles to be broken, resulting in poor contact between the material and the conductive agent and the binder, and the particles are broken at the same time. The area of ​​the interface between the material and the electrolyte is increased, which affects its electrochemical performance; the particle size distribution of the mixture of large particle size and small particle size is a non-normal distribution with two peaks, because the small particle size particles can be filled between the large particles In the gap between the particles, the

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  • High-nickel positive electrode material for non-aqueous electrolyte secondary battery and preparation method for high-nickel positive electrode material
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  • High-nickel positive electrode material for non-aqueous electrolyte secondary battery and preparation method for high-nickel positive electrode material

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Embodiment 1

[0017] The preparation method of the high-nickel positive electrode material for the non-aqueous electrolyte secondary battery of the present embodiment is as follows:

[0018] (1) Ni with D50 of 12 μm 0.80 co 0.10 mn 0.10 (OH) 2 The precursor, the lithium source is lithium hydroxide monohydrate, and the molar ratio is Li / (Ni+Co+Mn)=1.03. The additive is 20nm nano-magnesium oxide, and the proportion of magnesium added is 0.005mol. After mixing evenly with a ball mill, roast in an oxygen atmosphere at 780°C for 12 hours, crush the roasted product through a 200-mesh screen, wash with pure water and dry, take a certain amount of samples, and the additives are nano boron oxide, boron The proportion of the added element is 0.005mol. After mixing evenly, it is roasted at 450°C for 5 hours in an oxygen atmosphere and then sieved to obtain 12 μm Li 1.03 Ni 0.80 co 0.10 mn 0.10 Mg 0.005 B 0.005 o 2 Material;

[0019] (2) Ni with D50 of 3 μm 0.80 co 0.15 mn 0.05 (OH) 2 Th...

Embodiment 2

[0023] The preparation method of the high-nickel positive electrode material for the non-aqueous electrolyte secondary battery of the present embodiment is as follows:

[0024] (1) Ni with D50 of 13 μm 0.83 co 0.08 mn 0.09 (OH) 2 The precursor, the lithium source is lithium hydroxide monohydrate, and the molar ratio is Li / (Ni+Co+Mn)=1.04. The additive is 20nm nano-tungsten oxide, and the proportion of tungsten element added is 0.008mol. After mixing evenly with a ball mill, roast for 12 hours under an oxygen atmosphere at 770°C, crush the roasted product through a 200-mesh screen, wash with pure water and dry, take a certain amount of samples, and the additives are nano-tungsten oxide, tungsten The proportion of the added element is 0.005mol. After mixing evenly, it is roasted at 500°C for 5 hours under an oxygen atmosphere and sieved to obtain 13 μm Li 1.04 Ni 0.83 co 0.08 mn 0.09 W 0.013 o 2 Material;

[0025] (2) Ni with D50 of 4 μm 0.83 co 0.12 mn 0.05 (OH) 2...

Embodiment 3

[0029] The preparation method of the high-nickel positive electrode material for the non-aqueous electrolyte secondary battery of the present embodiment is as follows:

[0030] (1) Ni with D50 of 14 μm 0.65 co 0.15 mn 0.20 (OH) 2 The precursor, the lithium source is lithium carbonate, and the molar ratio is Li / (Ni+Co+Mn)=1.05. The additive is 20nm nano-zirconia, and the Zr element is added in a proportion of 0.01mol. It is mixed with a ball mill After homogenization, it was calcined at 860°C for 12 hours in an oxygen-air atmosphere, and the calcined product was crushed through a 200-mesh sieve to obtain 15 μm Li 1.05 Ni 0.65 co 0.15 mn 0.20 Zr 0.01 o 2 Material;

[0031] (2) Ni with D50 of 4 μm 0.65 co 0.20 mn 0.15 (OH) 2 The precursor, the lithium source is lithium carbonate, and the molar ratio is Li / (Ni+Co+Mn)=1.05. The additive is 20nm nano-zirconia, and the Zr element is added in a proportion of 0.01mol. It is mixed with a ball mill After uniformity, it was ...

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Abstract

The invention discloses a high-nickel positive electrode material for a non-aqueous electrolyte secondary battery and a preparation method for the high-nickel positive electrode material. The high-nickel positive electrode material is represented by a general formula: Li<w>Ni<1-x-y>Co<x>Mn<y>M<z>O<2>, wherein an average particle diameter D50 is 8-15 [mu]m, and is formed by the small particle sizeD50 of 2-5 [mu]m and the small particle size D50 of 8-18 [mu]m, the Co content (metal molar ratio, SC) of the small particle diameter is higher than the Co content (metal molar ratio, LC) of the largeparticle diameter, and the Co concentration ratio (SC/LC) is preferably from the range of 1.2-2. According to the invention, the material structure of the high-nickel positive electrode material is stabilized through element doping and coating, and the crystal structure of the material is stabilized by increasing the cobalt content in the small particle size, and the cycle performance of the material is improved; and finally, the small particle size and the large particle size are mixed according to different proportions, so that the tap density of the positive electrode material and the compaction density of a pole piece are improved.

Description

technical field [0001] The invention relates to a positive electrode material for a non-aqueous electrolyte secondary battery, in particular to a high-nickel positive electrode material composed of a high-nickel composite oxide. technical background [0002] With the rapid development of new energy vehicles, the demand for power batteries continues to increase. In recent years, new energy vehicles have higher and higher requirements for cruising range, and higher energy density, cycle performance and safety performance of lithium-ion batteries. challenge. High-nickel cathode materials, because of their high capacity and low cost, have become the focus of attention of cathode materials and have a very broad market in the field of power batteries. [0003] Due to the high nickel content of high nickel-based positive electrode materials, the radius of lithium ions with the radius of nickel It is relatively close, and it is easy to produce mixed lithium and nickel, which af...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 刘艳侠李晶晶张锁江马立彬于天恒侯奥林
Owner 郑州中科新兴产业技术研究院
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