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Lithium-ion battery positive material and its production

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as low compaction density and poor internal short-circuit resistance, and achieve reduced safety performance, high cost performance, and superior performance Effect

Inactive Publication Date: 2011-07-06
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-based materials (the general formula is Li a Ni x co y mn z o 2 (of which 0.97≤a≤1.07, 0.3≤x≤0.9, 0≤y≤0.5, 0≤z≤0.5)) was developed in recent years, the price is about 1 / 3 cheaper than lithium cobaltate, and the quality is more than the capacity. It is higher than lithium cobaltate (1C capacity is about 145~160mAh / g), and its anti-overcharge performance is superior to that of lithium cobaltate. The capacity and platform retention rate during cycling are higher than lithium cobaltate, but its output voltage is higher than that of lithium cobaltate. It is about 100mV lower (50% above 3.6V), and the compaction density is lower than that of lithium cobalt oxide, which is 3.3-3.6g / cm3. The capacity retention at high temperature and low temperature needs to be improved, and the resistance to internal short circuit (acupuncture) is poor.

Method used

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  • Lithium-ion battery positive material and its production
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  • Lithium-ion battery positive material and its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take lithium cobaltate and nickel-based material LiNi according to the mass ratio of 6:4 0.6 co 002 mn 0.2 o 2 , using zirconia balls as the medium, vibrating mill for 2.5 hours to mix evenly, the ball milling speed is 100r / min, take out and bake at 150°C for 10h to obtain the composite material of the present invention.

[0023] The mixed material is used as the positive electrode active material, graphite is used as the negative electrode active material, and a 063048S steel shell battery is manufactured according to the lithium ion battery manufacturing process commonly used in the prior art. The electrochemical performance test was carried out with the above-mentioned battery, figure 1 where a is the first discharge curve of the battery, figure 2 is the cycle efficiency curve of the battery. The results show that the positive electrode material prepared in this example has a mass specific capacity of 147mAh / g, an average output voltage of 3.75V, and a compacte...

Embodiment 2

[0026] Take lithium cobaltate and nickel-based material Li according to the mass ratio of 5:95 0.97 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 , using zirconia balls as the medium, vibrating mill for 24 hours to mix evenly, and the ball milling speed is 20r / min. Take out and bake at 150°C for 10 hours to obtain the composite material of the present invention.

[0027] The battery was prepared in the same manner as in Example 1 for electrochemical performance testing. The results showed that the positive electrode material prepared in this example had a mass specific capacity of 145mAh / g, an output voltage of 3.71V, and a compacted density of 3.65g / cm 3 , the capacity and platform retention rate of 300 cycles are 96.8% and 95.7%, respectively.

[0028] The test results of the safety performance of the battery show that the composite material can withstand overcharge (3C / 5V), external short circuit, high temperature 130°C oven test, high temperature 55°C and low temperature -20°C capacity re...

Embodiment 3

[0030] Lithium cobaltate and nickel-based material Li are taken at a mass ratio of 80:20 1.03 Ni 0.4 co 0.3 mn 0.29 o 2 , using zirconia balls as the medium, vibrating mill for 1 hour to mix evenly, and the ball milling speed is 300r / min. Take out and bake at 150°C for 10 hours to obtain the composite material of the present invention.

[0031] The battery was prepared in the same manner as in Example 1 for electrochemical performance testing. The results showed that the positive electrode material prepared in this example had a mass specific capacity of 141mAh / g, an output voltage of 3.77V, and a compacted density of 3.86g / cm 3 , the capacity and platform retention rate of 300 cycles are 92.1% and 92.3% respectively.

[0032] The test results of the safety performance of the battery show that the composite material can withstand overcharge (3C / 5V), external short circuit, high temperature 130°C oven test, high temperature 55°C and low temperature -20°C capacity retention...

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Abstract

The present invention is concerned with anode material of Li-ion battery. Add at least one mixed metal oxide to Ni-based composites, and the latter is LiaNixCoyMnzO2, 0.97<=a<=1.07, 0.3<=x <=0.9, 0<=y<=0.5, 0<=z<=0.5. The mixed metal oxide contains LiCoO2, doped compound of LiCoO2 or doped compound of LiMn2O4. This invention also opens the production of the said anode material. The anode material is cheaper and better than LiMn2O4, and the production of anode material is easy for produce and control.

Description

technical field [0001] The invention relates to an electrode material of a lithium ion battery, in particular to a positive electrode material of a lithium ion battery and a preparation method of the material. Background technique [0002] Lithium cobalt oxide, lithium nickel oxide and lithium manganese oxide are commonly used cathode active materials for lithium batteries. Lithium cobalt oxide is the earliest to be commercialized and the technology is the most mature. Therefore, the performance stability of the material is relatively good, the processing behavior is good, and the compaction density is high. (3.6~3.9g / cm3), the mass specific capacity is relatively high (138~142mAh / g), the structure of the material is stable, and the cycle performance is good (the capacity retention rate of 1C cycle 300 times is 88~91%), the voltage platform of the material It is relatively high (80% above 3.6V) and relatively stable, and has good compatibility with the electrolyte, but its e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48C01D15/00C01G1/02C01G45/00C01G51/00C01G53/00H01M4/525
CPCY02E60/10
Inventor 方送生张建文
Owner SHENZHEN BAK POWER BATTERY CO LTD