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High-tap-density high-nickel positive electrode material and preparation method thereof

A technology of positive electrode material and tap density, applied in the field of high tap density and high nickel positive electrode material and its preparation, can solve the problems of battery volume expansion, reduced battery capacity, cycle life, battery explosion, etc.

Inactive Publication Date: 2020-07-07
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the moisture in the material will not only reduce the performance of the battery capacity and cycle life, but also cause the volume of the battery to expand, and in severe cases, the battery will explode.

Method used

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  • High-tap-density high-nickel positive electrode material and preparation method thereof
  • High-tap-density high-nickel positive electrode material and preparation method thereof
  • High-tap-density high-nickel positive electrode material and preparation method thereof

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[0049] Another aspect of the present invention provides a method for preparing a high-tap density and high-nickel positive electrode material, preferably a method for preparing the high-tap density and high-nickel positive electrode material described in the first aspect of the present invention, the method comprising the following steps:

[0050] Step 1. Prepare high-nickel base materials with different particle sizes.

[0051] According to the present invention, in step 1, at first need prepare the high-nickel matrix material of different particle size, for this reason, can adopt following steps to prepare:

[0052] Step 1.1), mixing the high nickel hydroxide precursor with the lithium source,

[0053] According to the present invention, the high-nickel hydroxide precursor can use the formula Ni 1-x-y co x m y (OH) 2 Express, wherein, 1-x-y>0.6, x>0, y>0, M is Al, Mn or Mg;

[0054] Preferably, 1-x-y>0.8, 0.2>x>0, 0.2>y>0.

[0055] According to the present invention, i...

Embodiment 1

[0128] Mix the nickel-cobalt-manganese hydroxide precursor with 45.52g lithium hydroxide, wherein the molar ratio of the lithium source to the nickel-cobalt-manganese hydroxide precursor is 1.03, ball mill at 10Hz for 6h, and pre-sinter at 600°C for 4h , wherein, the heating rate is 2°C / min, and then cooling down naturally;

[0129] The obtained material is crushed, passed through a 300-mesh sieve, sieved 4 times, and then secondary sintered to obtain high-nickel base materials A and B respectively,

[0130] The preparation process of high-nickel base material A: The secondary sintering process is 5°C / min to 650°C, then 2°C / min to 800°C, heat preservation for 4 hours, cooling with the furnace, crushing, sieving, and grading.

[0131] The preparation process of high-nickel base material B: the secondary sintering process is 5°C / min to 600°C, then 2°C / min to 750°C, heat preservation for 4 hours, cooling in the furnace, crushing, sieving, and grading;

[0132] Take by weighing 9...

Embodiment 2

[0136] With reference to Example 1 for the specific operation process, the only difference is that 80g of high-nickel base material A (LiNi 0.88 co 0.09 mn 0.03 o 2 ), and its particle size distribution is D 10 11.1 μm, D 50 17.0 μm, D 100 35.5μm, weigh 20g high nickel base material B (LiNi 0.88 co 0.09 mn 0.03 o 2 ), and its particle size distribution is D 10 2.9 μm, D 50 5.6 μm, D 100 15.0μm;

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Abstract

The invention discloses a high-tap-density high-nickel positive electrode material and a preparation method thereof. The high-nickel positive electrode material is formed by grading two or more high-nickel base materials with different median particle sizes D50. The preparation method of the high-tap-density high-nickel positive electrode material comprises the steps of 1, preparing high-nickel base materials with different particle sizes; and 2, mixing the high-nickel base materials with different particle sizes. According to the invention, the high-tap-density high-nickel positive electrodematerial is prepared by adopting a grading method of particles with large and small particle sizes, the prepared high-nickel positive electrode material has relatively high tap density and relativelylow residual alkali content, a lithium ion battery prepared from the positive electrode material has excellent electrochemical performance, and the preparation method is simple, efficient, low in cost, environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of batteries, and relates to a positive electrode material of a lithium ion battery and a preparation method thereof, in particular to a high tap density and high nickel positive electrode material and a preparation method thereof. Background technique [0002] Due to its energy density, long cycle life, and no memory effect, lithium-ion batteries have broad application prospects in portable electronic devices, electric vehicles, and other fields, and have become a focus of attention and research. In the preparation of lithium-ion batteries, the cathode material has an important impact on the performance of the battery. With the development of electronic equipment and new energy automobile industry, cathode materials are required to have high reversible specific capacity, low cost, and good cycle performance. At present, the anode materials of commercialized lithium-ion batteries are m...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王燕超杨俊吕姚凌仕刚沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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