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Lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof

A cathode material, lithium nickel manganese oxide technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as being unfavorable to large-scale commercial production, difficult to control the experimental process, and unfavorable to large-scale production. The effect of improving battery cycle performance, good capacity rate performance and cycle performance, and excellent thermal stability

Pending Publication Date: 2022-08-02
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sol-gel method is costly, difficult to recover samples, and the coating layer is too thick, so it is difficult to repeat the experiment and is not suitable for mass production.
[0010] Patent CN10602525 B proposes to make lithium titanium phosphate (LiTi(PO 4 ) 3 ) is coated on the surface of the positive electrode material, followed by heat treatment to form a fast ion conductor type solid electrolyte layer to improve the rate performance of the material. This method is cumbersome and costly, and n-butyl titanate is used in the process. large-scale commercial production
[0011] Patent CN104766960 B proposes to add lithium nickel manganese oxide into water, then add surfactant to the suspension, then add sodium metaaluminate solution, pass carbon dioxide into the mixed solution while stirring to adjust the pH value, and then put it in the muffle furnace Aluminum oxide-coated lithium nickel manganese oxide cathode material was obtained by heat treatment. This method uses gas to adjust pH, and the experimental process is difficult to control, which is not conducive to large-scale production.
[0012] To sum up, in order to achieve the purpose of uniform coating material and high coating rate in the existing technology, most of them use wet methods such as sol-gel method for coating. The process is cumbersome, and drying and water removal are required. Good for commercial application

Method used

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  • Lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof
  • Lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof
  • Lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0079] The present invention also provides a preparation method for preparing the above-mentioned lithium nickel manganate positive electrode material, which is used to explain the preparation process of the above-mentioned lithium nickel manganate positive electrode material, but the preparation of the above-mentioned lithium nickel manganate positive electrode material is not limited to this method. The preparation method used for example includes but is not limited to the following steps:

[0080] S1: Mix and stir the precursor, lithium source and single crystal dispersant evenly.

[0081] Wherein, the molecular formula of the precursor is: Ni β Mn 2-β (OH) 4 , where 0.4≤β≤0.6; the precursor has at least one of the following characteristics: the D50 of the precursor is 2-8 μm; the specific surface area of ​​the precursor is 10-30 m 2 / g; the tap density of the precursor is 0.8-1.5g / cm 3 .

[0082] Alternatively, the β may be 0.4, 0.5 or 0.6.

[0083] Optionally, the D...

Embodiment 1

[0110] (1) 1000g precursor Ni 0.5 Mn 1.5 (OH) 4 , 205.6g lithium carbonate and 3g single crystal dispersant V 2 O 5 Add it into a high-speed mixer to mix and stir evenly. The stirring speed is 800rpm and the stirring time is 20min. After mixing, it is placed in an atmosphere box furnace for the first sintering. During the first sintering, the rate is 3 °C / min. 900°C, hold for 8h; then cool down to 650°C at a rate of 0.5°C / min, hold at 650°C for 10h, and naturally drop to room temperature.

[0111] (2) Pulverize and sieve the product after the first sintering to obtain a high-voltage nickel-manganese material with high single crystal dispersibility, the chemical formula is LiNi 0.5 Mn 1.5 V 0.0059 O 4 ; The BET of the sample after the first firing is 0.37m 2 / g, SEM scan as figure 1 , it can be seen that V 2 O 5 When used as a single crystal dispersant, the single crystal dispersion effect is good.

[0112](3) 1000g of high single-crystal dispersity lithium nickel m...

Embodiment 2

[0117] The difference between Example 2 and Example 1 is that the single crystal dispersant used in Example 2 is Nb 2 O 5 , the BET of the sample after the first firing is 0.36m 2 / g, SEM scan as figure 2 , it can be seen that Nb 2 O 5 When used as a single crystal dispersant, the single crystal dispersion effect is good. The coated lithium nickel manganate cathode material LiNi is obtained 0.5 Mn 1.5 Nb 0.0041 O 4 / P. The coated sample has a BET of 0.45m 2 / g, ICP test was performed on the coated lithium nickel manganate positive electrode material, and the coating amount of P was 1500 ppm.

[0118] The all-electric preparation is the same as that of Example 1. The initial capacity of 0.33C is 131.2mAh / g, the capacity retention rate of 500 cycles is 72.9%, and the gas production is 5.8mL / Ah.

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Abstract

The invention discloses a lithium nickel manganese oxide positive electrode material and a preparation method and application thereof, the molecular formula of the lithium nickel manganese oxide positive electrode material is Li alpha Ni beta Mn 2-beta M gamma O 4-delta / N, alpha is more than or equal to 0.95 and less than or equal to 1.1, beta is more than or equal to 0.4 and less than or equal to 0.6, gamma is more than or equal to 0.0005 and less than or equal to 0.02, and delta is more than or equal to 0 and less than or equal to 0.2; m is a single crystal dispersed element, and M is at least one of V, Nb, Ta, Mo or W; n is a coating layer, and the coating layer comprises a P compound and / or an Al compound; and the coating amount of N is 500 to 10000 ppm. The preparation method comprises the following steps: firstly, adding a small amount of single-crystal dispersed elements (V, Nb, Ta, Mo or W) to prepare a high-voltage nickel-manganese material with good single-crystal dispersity, so that the high-voltage nickel-manganese material has a smaller specific surface area; furthermore, the lithium nickel manganese oxide positive electrode material with high single crystal dispersity is uniformly coated with the P compound and / or the Al compound, so that oxygenolysis caused by direct contact between the positive electrode material and an electrolyte is avoided, the stability of the material is improved, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and particularly relates to a lithium nickel manganate positive electrode material and a preparation method and application thereof. Background technique [0002] High voltage nickel manganese cathode material LiNi 0.5 Mn 1.5 O 4 , The material does not contain cobalt element, is cost-effective and environmentally friendly, and is considered to be a promising next-generation lithium battery cathode material. Compared with olivine-like lithium iron phosphate (LiFePO 4 , abbreviated LFP), spinel-type high-voltage nickel-manganese, with three-dimensional lithium ion channels, better rate and low temperature performance; single battery energy density of 235-250Wh / kg, 30-40% higher than LFP, but Wh The (watt-hour) cost is close to or slightly lower than that of LFP. [0003] Therefore, in view of the vast market of LFP power batteries, low energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/525H01M4/505Y02E60/10
Inventor 陈宇桑椿媛黄涛武斌严旭丰刘瑞李琮熙孙辉刘相烈
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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