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Anode material of lithium ion cell and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, applied in the field of lithium cobalt oxide materials and their preparation, can solve the problems of unfavorable industrialized production, high cost of lithium cobalt oxide materials, difficulty in realizing large-scale production, etc., so as to improve the compaction density and volume. Effects of specific capacity, improved long-term cycle performance, and increased structural stability

Active Publication Date: 2009-05-20
广东风华新能源股份有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example, the manufacturing process of the liquid phase method is complicated, and it is difficult to achieve large-scale production; the cost of lithium cobaltate prepared by the nano-cobalt tetroxide raw material preparation technology is too high, and it is difficult to increase the density, and the volume specific energy of the positive electrode is low; the use of surface coating technology There will be incomplete coating, and the coating technology is not perfect; the synthesis of lithium cobaltate in high-temperature solid-state reaction can improve the density of lithium cobaltate material, but the long-term cycle performance of the prepared material will be affected; Grain lithium cobaltate is relatively strict to the air atmosphere in the calcination process, and nitrogen needs to be added, the process is complicated, and it is strict to the firing equipment, and the cost is high, which is not conducive to industrial production; The method of position diameter and tap density can improve the median diameter and tap density of lithium cobalt oxide to a certain extent, but it adds a large amount of finished LiCoO 2 Therefore, the long-term cycle performance and safety performance of the material are limited to a certain extent, and the final quality of the material cannot be guaranteed

Method used

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  • Anode material of lithium ion cell and preparation method thereof

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preparation example Construction

[0032] Step 1, preparation of doped tricobalt tetroxide:

[0033] 1) Select high-purity cobalt carbonate or cobalt oxalate as raw material, Sb 2 o 3 As a dopant, it is prepared at a molar ratio of Co:Sb=1:(0.002-0.02);

[0034] 2) Mix the cobalt raw material and the dopant according to a certain ratio, use a planetary ball mill or other mixing methods to mix the raw materials evenly, and put them in a bowl;

[0035] 3) Put the material at 300-500°C for 2-10 hours, and put it in a bowl;

[0036] 4) Put the material at 750-920°C for 1-2 hours, and then sieve to obtain the required raw material of tricobalt tetroxide;

[0037] Step 2, A material production:

[0038] 1) Select cobalt tetroxide and lithium carbonate (purity ≥ 99.5%) prepared in step 1 as raw materials, and carry out ingredients according to the lithium-cobalt ratio of 1.05-1.20;

[0039] 2) Use planetary ball mill or other forms of ball milling to mix the dry powder evenly, then loosely pack it in a bowl and put...

Embodiment 1

[0054] Prepare lithium cobalt oxide cathode material according to the above-mentioned scheme:

[0055] 1.1 Using cobalt oxalate as raw material, Sb 2 o 3 As a dopant, the ingredients are mixed according to the molar ratio of Co:Sb=1:0.005, treated at 400°C for 3h, sieved into a bowl, and treated at 900°C / 2h to obtain tricobalt tetroxide;

[0056] 1.2 Select lithium carbonate and cobalt tetroxide prepared in step 1.1 as raw materials, mix the ingredients according to the lithium-cobalt ratio of 1.08:1, put in a bowl, treat at 900°C / 8h, and obtain material A after crushing and grading;

[0057] 1.3 Lithium carbonate, small particles of highly active cobalt carbonate (0.1μm≤D50≤1.0μm), dopant Sb 2 o 3 , according to the stoichiometric ratio Li 1.0 co 0.99 Sb 0.01 o 2 Carry out batching, after the dry powder is mixed evenly, obtain B material;

[0058] 1.4 Select material A prepared in step 1.2 and material B prepared in step 1.3, mix according to the weight ratio of 90:10...

Embodiment 2

[0062] Prepare lithium cobaltate positive electrode material by the method for above-mentioned embodiment 1, but different from above-mentioned embodiment 1 is:

[0063] 2.1 The dopant Sb in step 1.1 of embodiment 1 2 o 3 The doping amount of the improved, by the molar ratio of Co:Sb=1:0.01 batching;

[0064] 2.2 Adjust the lithium-cobalt ratio in Step 1.2 of Example 1 to 1.10:1;

[0065] 2.3 Adjust the stoichiometric ratio to Li in step 1.3 of Example 1 1.0 co 0.995 Sb 0.005 o 2 ;

[0066] 2.4 Adjust the weight ratio of material A to material B in step 1.4 of Example 1 to 80:20;

[0067] 2.5 Carry out secondary synthesis of the material prepared in step 1.4, raise the temperature to 750°C for 4 hours and keep it for 4 hours, then increase the temperature to 940°C at a rate of 35°C / h, keep it for 12 hours, and then cool down naturally;

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Abstract

The invention discloses a method for preparing lithium cobaltate positive pole material for a lithium ion cell and the obtained lithium cobaltate positive pole material. The method comprises the following steps: adopting a multiple-step synthesizing process; in a first synthesis, adopting excessive lithium so as to obtain larger lithium cobaltate particles at lower temperature; and before a second synthesis, adhering mixed powder of cobalt carbonate and lithium carbonate with small particle size and larger specific surface area to the one-step synthesized lithium cobaltate large particles through a mechanical granulation mode. The method can effectively improve the particle size and the tap density of the lithium cobaltate positive pole material so as to improve the compacted density and the volume specific capacity of the positive pole material.

Description

technical field [0001] The invention relates to a lithium cobaltate material for secondary lithium ion batteries and a preparation method thereof, more specifically, the present invention relates to a lithium cobaltate material with high volume specific capacity for secondary lithium ion batteries and its preparation method. Background technique [0002] With the further miniaturization and color screen of mobile phones, the demand for high-capacity lithium-ion batteries in the market is increasing, and high-capacity batteries must use positive electrode materials with high volumetric capacity. Improving the specific capacity and tap density of the material are two ways to increase the volume specific capacity of the positive electrode material of the lithium-ion battery. At present, it is difficult to increase the specific volume of lithium cobalt oxide materials with existing technologies, so it is very important to improve the compactness of positive electrode materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01G51/00
CPCY02E60/12Y02E60/10
Inventor 廖钦林刘玉红谢麟唐勇
Owner 广东风华新能源股份有限公司
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