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Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of uneven surface distribution of additive size particles, uneven surface distribution of doping element size particles, and difficulty in ensuring stability, etc.

Active Publication Date: 2016-03-30
北京盟固利新材料科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In the prior art, Chinese patent CN200710031382 discloses a method for preparing lithium cobaltate with high energy density, using lithium carbonate and cobalt carbonate to granulate the surface of pre-prepared large-grained lithium cobaltate, thereby preparing a large-grained lithium cobaltate surface Adhering small particles of lithium cobalt oxide particles, although this method improves the energy density of the positive electrode material, but the lithium cobalt oxide sintered once has poor crystallinity and poor cycle performance
[0004] Chinese patent CN201110314401.0 prepares a high-density lithium-ion battery positive electrode material by mixing two or three different particle sizes, but it chooses F as anion doping is added in the secondary sintering, and F ion doping does not Homogeneous, after mixing, the secondary sintering is carried out. The additives used in the secondary mixing are not uniformly distributed on the surface of the large and small particles, which affects the uniformity of the material.
[0005] Chinese patent CN200410007731.5 by making the bulk density 1.7-3.0g / cm 3 Li a CoO 2 (0.2≤a≤1.2) and bulk density of 1.0-2.0g / cm 3 Li a co 1-y m y o 2-z (0.2≤a≤1.2, 0≤y≤0.4, 0≤z≤1.0) are mixed, but lithium cobaltate A is not doped, and the stability under high voltage is difficult to guarantee
[0006] The secondary mixed surface doping in Chinese patent CN201110305140.6 also encountered the problem of uneven distribution of doping elements on the surface of large and small particles. miscellaneous
[0007] In the Chinese patent CN201210269490.6, the large particles and the small particles are mixed only after one sintering to form the positive electrode material, which is not suitable as a high voltage positive electrode material

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0149] (1) Weigh 48.5g of lithium carbonate, 100g of cobalt tetroxide and 4.062g of magnesium fluoride (as an additive), and prepare a lithium cobaltate precursor I whose D50 particle size is 20 μm;

[0150] (2) Get the ZrO of the lithium cobaltate precursor 100g that step 1 makes and 0.5g (0.5% by weight) 2 , 0.05g (0.05% by weight) of lithium carbonate and 0.01g (0.01% by weight) of boron oxide are mixed, then calcined at 1050°C for 10h to obtain a lithium cobaltate semi-finished product I with a D50 particle size of 20 μm;

[0151] (3) Weigh 45.5g of lithium carbonate, 100g of cobalt tetroxide and 4.062g of magnesium fluoride (as an additive), and prepare a lithium cobaltate precursor II with a D50 particle size of 5 μm;

[0152] (4) Get the lithium cobaltate precursor II100g that step 3 makes and 0.5g (0.5% by weight) of ZrO2, 0.05g (0.05% by weight) of lithium carbonate and 0.01g (0.01% by weight) of boron oxide Mixing and calcining at 900°C for 10 hours to obtain semi-f...

Embodiment 2

[0155] (1) Weigh 48.5g of lithium carbonate, 100g of cobalt tetroxide, 0.916g of lithium fluoride and 5.2g of nano-titanium dioxide (wherein, lithium fluoride and nano-titanium dioxide are used as additives), and prepare a lithium cobaltate precursor I whose D50 particle size is 18 μm;

[0156] (2) get the lithium cobaltate precursor I100g that step 1 makes and the magnesium carbonate of 0.3g (weight percentage 0.3%), the lithium hydroxide of 0.03g (weight percentage 0.03%) and 0.01g (weight percentage 0.01%) After the strontium carbonate was mixed, it was calcined at 1000°C for 10 hours to obtain a lithium cobaltate semi-finished product I with a D50 particle size of 18 μm;

[0157] (3) Weigh 45.93g lithium carbonate, 100g tricobalt tetroxide, 3.5g magnesium fluoride and 2.8g nano-titanium dioxide (wherein, magnesium fluoride and nano-titanium dioxide are used as additives) to prepare lithium cobaltate precursor II with a D50 particle size of 6 μm;

[0158] (4) Get the lithiu...

Embodiment 3

[0161] (1) Weigh 47.9g of lithium carbonate, 100g of tricobalt tetroxide, 1g of lithium fluoride and 2.8g of bismuth oxide (wherein, lithium fluoride and bismuth oxide are used as additives) to prepare a lithium cobaltate precursor I with a D50 particle size of 16 μm;

[0162] (2) the lithium cobaltate precursor I100g that step 1 makes and the magnesium hydroxide of 0.3g (0.3% by weight), the titanium dioxide of 0.03g (0.03% by weight) and the fluorine of 0.01g (0.01% by weight) After mixing aluminum chloride and 0.03g (0.03% by weight) of lithium nitrate, calcining at 1000°C for 8h to obtain a semi-finished product I of lithium cobaltate with a D50 particle size of 16 μm;

[0163] (3) Weigh 46.8g of lithium carbonate, 100g of tricobalt tetroxide, 0.458g of ammonium fluoride and 3.36g of niobium pentoxide (ammonium fluoride and niobium pentoxide are used as additives) to prepare lithium cobaltate with a particle size of 8 μm in D50 Precursor II;

[0164] (4) Get the lithium c...

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Abstract

The invention provides a lithium ion battery cathode material and a preparation method thereof. The method comprises: taking a lithium source, a cobalt source and a compound with doped elements as raw materials, respectively preparing two kinds of bulk phase doped lithium cobalt oxide precursors of median grain diameters (namely D50 grain diameters), carrying out surface doped treatment to the two kinds of lithium cobalt oxide semi-finished products, finally mixing the two kinds of lithium cobalt oxide semi-finished products, carrying out surface coating, and finally preparing the high voltage and high density lithium ion battery cathode material. The prepared lithium ion battery cathode material is featured by good electrical property, specifically high capacity, high cycle retention rate, low thermal expansion coefficient and high compaction density.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery cathode materials, in particular to a high-voltage, high-density lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] One of the main trends in the development of lithium-ion batteries today is to increase the energy density of the battery, and on this basis to ensure its high, low temperature and rate performance; for lithium-ion battery cathode materials, it is now mainly towards high voltage while taking into account high voltage Usually, the volumetric energy density can be effectively increased through the gradation of lithium cobalt oxides with different particle sizes, and high voltage can further increase the gravimetric energy density, so that the overall energy density of the battery can be greatly improved. ; But the problems that need to be solved are as follows: for large particles, how to ensure the specific capacity wh...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/36H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 陈宇周玉林江卫军屈兴圆李明亮杨旭辉苏迎春张溪
Owner 北京盟固利新材料科技有限公司
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