High-nickel positive electrode material and preparation method and application thereof

A positive electrode material, high-nickel technology, applied in nanotechnology, chemical instruments and methods, nickel compounds, etc. for materials and surface science, can solve the problems of difficult mass production, affecting battery power performance, low water content, etc. problem, to achieve good cycle performance and good lithium supplementation performance

Active Publication Date: 2021-04-09
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method is to use lithium metal to replenish lithium on the negative electrode. Since lithium metal and water will react violently, the water content in the operating environment is required to be extremely low, which has certain safety risks.
The second method is to use a high-concentration electrolyte to replenish lithium on the negative electrode, because it will consume lithium ions in the electrolyte, which will eventually affect the power performance of the battery
However, due to the need for conventional positive electrode materials (lithium cobaltate, lithium manganese oxide, lithium nick

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

Examples

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Example Embodiment

[0076] Example 1

[0077] This embodiment provides a high-nickel positive electrode material, the high-nickel positive electrode material has a core-shell structure, and the core material is LiNi 0.83 co 0.12 mn 0.05 o 2 , the shell material is Li 2 Ni 0.83 co 0.12 mn 0.05 o 2 , the molar ratio of the core material and the shell material is 1:0.06, the radius of the core material is 4.9 μm, the thickness of the shell material is 0.1 μm, and the nano-coating layer is nano-Al 2 o 3 (The mass percentage of the added amount in the high-nickel positive electrode material is 0.5wt%).

[0078] The preparation process of the above-mentioned high-nickel positive electrode material includes the following steps (the structure of the high-nickel positive electrode material changes in the synthesis process as shown in figure 1 shown):

[0079] (1) The high-nickel positive electrode raw material (agglomerated type, structure such as figure 1 Shown in a) and water are added to th...

Example Embodiment

[0083] Example 2

[0084] This embodiment provides a high-nickel positive electrode material, the high-nickel positive electrode material has a core-shell structure, and the core material is LiNi 0.83 co 0.12 mn 0.05 o 2 , the shell material is Li 2 Ni 0.83 co 0.12 mn 0.05 o 2 , the molar ratio of the core material and the shell material is 1:0.37, the radius of the core material is 4.5 μm, the thickness of the shell material is 0.5 μm, and the nano-coating layer is nano-Al 2 o 3 (The mass percentage of the added amount in the high-nickel positive electrode material is 0.5wt%).

[0085] The preparation process of the above-mentioned high-nickel positive electrode material comprises the following steps:

[0086] (1) Add the high-nickel positive electrode raw material (agglomerated type) and water shown in formula I with a mass ratio of 5:1 into the reactor, dissolve for 30 minutes, and obtain the high-nickel positive electrode raw material slurry;

[0087] (2) perfor...

Example Embodiment

[0090] Example 3

[0091] This embodiment provides a high-nickel positive electrode material, the high-nickel positive electrode material has a core-shell structure, and the core material is LiNi 0.83 co 0.12 mn 0.05 o 2 , the shell material is Li 2 Ni 0.83 co 0.12 mn 0.05 o 2 , the molar ratio of the core material and the shell material is 1:0.95, the radius of the core material is 4.0 μm, the thickness of the shell material is 1.0 μm, and the nano-coating layer is nano-Al 2 o 3 (The mass percentage of the added amount in the high-nickel positive electrode material is 0.5wt%).

[0092] The preparation process of the above-mentioned high-nickel positive electrode material comprises the following steps:

[0093] (1) Add the high-nickel positive electrode raw material (agglomerated type) and water shown in Formula I with a mass ratio of 5:1 into the reactor, and dissolve for 60 minutes to obtain the high-nickel positive electrode raw material slurry;

[0094] (2) perf...

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Abstract

The invention relates to a high-nickel positive electrode material as well as a preparation method and application thereof. The high-nickel positive electrode material is of a core-shell structure, the structures of a core material and a shell material are respectively shown as a formula I and a formula II, M is a metal element, 0.6<=b<=1, a molar ratio of the core material to the shell material is 1:a, and 0<a<=1. The high-nickel positive electrode material of a core-shell structure is formed through in-situ growth on the surface of the high-nickel positive electrode raw material. On one hand, the high-nickel positive electrode material can be prepared into a positive electrode piece at a time, the energy density of the battery is improved by generating a lithium supplementing effect on a negative electrode through the shell material during charging, no additional lithium supplementing material is needed, the process is simple, and the lithium supplementing effect is good; and on the other hand, a protective layer can be formed on the surface of the high-nickel positive electrode material after the battery obtained by utilizing the high-nickel positive electrode material is charged for the first time, so that the stability and the safety of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-nickel positive electrode material and its preparation method and application, in particular to a high-nickel positive electrode material capable of replenishing lithium on the negative electrode and its preparation method and application. Background technique [0002] New energy vehicles have four main requirements for lithium-ion power batteries, namely high energy density, long calendar life, high safety performance and low manufacturing cost. At present, power batteries have begun to use high-nickel ternary cathode materials (NCM or NCA) with a specific capacity of more than 205mAh / g, and the energy density of the single battery made is higher than 300Wh / kg. New energy vehicles equipped with high specific energy and high nickel system power batteries can have a cruising range of more than 500km. The use of high-nickel cathode materials meets the development requir...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M4/62H01M4/131H01M10/058H01M10/0525C01G53/00C01F7/02B82Y30/00B82Y40/00
CPCH01M4/525H01M4/505H01M4/485H01M4/62H01M4/131H01M10/058H01M10/0525C01G53/50C01F7/021B82Y30/00B82Y40/00C01P2004/80C01P2004/61C01P2004/62C01P2004/64Y02E60/10Y02P70/50
Inventor 李宁李翔张立王仁念赵尚骞王建涛
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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