Super-size and high-density lithium cobalt oxide and method for preparing the same

A lithium cobalt oxide, high-density technology, applied in the field of high-energy power supply materials, can solve the problems of complex process, low production efficiency, and no lithium cobalt oxide doping, and achieve simple and controllable process, reduced cost, and large particle size Effect

Active Publication Date: 2008-10-15
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the median diameter of the product of this process is only about 10-14 μm, and part of lithium cobaltate (0-100%) is used as the crystal nucleus for repeated cycles, the process is complicated and the production efficiency is low
[0008] According to the patent documents retrieved, there is no median diameter > 20μm and tap density > 2.6g / cm 3 Lithium cobaltate or median diameter ≥ 15μm, tap density ≥ 2.5g / cm 3 Invention Report of Doped Lithium Cobalt Oxide

Method used

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  • Super-size and high-density lithium cobalt oxide and method for preparing the same
  • Super-size and high-density lithium cobalt oxide and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Lithium carbonate and cobalt oxide were weighed, poured into a mixing tank in turn and mixed thoroughly, and the molar ratio of Li / Co was controlled to be 1.05. Put the mixture into a ceramic sagger and compact it, then place it in a high-temperature furnace, raise the temperature at 10°C / min, and keep it at 980°C for 5 hours. After cooling down, the black block material obtained is ground and pulverized, and then passed through a 300-mesh sieve. The median diameter of the product is 21.35μm, and the tap density is 2.75g / cm 3 .

[0036] The material is mixed with carbon black and polyvinylidene fluoride (PVDF) according to a weight ratio of 94%: 3%: 3% and drawn into a pole piece. Form 053048 square aluminum shell battery; test the electrochemical performance and safety performance of the battery. The specific capacity of the material in the battery is 138mAh / g, the 3.6V platform capacity rate of the battery is 78%, 1C 5 A The capacity retention rate of 100 charge-d...

Embodiment 2

[0038] Lithium carbonate and cobalt carbonate were weighed, poured into a mixing tank in turn and mixed thoroughly, and the molar ratio of Li / Co was controlled to be 1.15. Put the mixture into a ceramic sagger and compact it, then place it in a high-temperature furnace, raise the temperature at 15°C / min, and keep it at 1050°C for 5 hours. After cooling down, the black block material obtained is ground and pulverized, and then passed through a 300-mesh sieve. The median diameter of the product is 37.35μm, and the tap density is 2.81g / cm 3 .

[0039] The material was processed into a 053048 battery by the same method as in Example 1, and the electrochemical performance and safety performance of the battery were tested. The specific capacity of the material in the battery is 136mAh / g, the capacity rate of the battery 3.6V platform is 76%, 100 times 1C 5 A The charge-discharge cycle capacity retention rate is 92.5%, and the thermal shock test result in a 150°C hot box shows tha...

Embodiment 3

[0041] Lithium hydroxide, cobalt oxide, and barium carbonate were weighed, poured into a mixing tank in turn and mixed thoroughly, and the molar ratio of Li / (Co+Ba) was controlled to be 1.05, and the molar ratio of Ba / (Co+Ba) to 0.05. Put the mixture into a ceramic sagger and compact it, then place it in a high-temperature furnace, raise the temperature at 10°C / min, and keep it at 1080°C for 5 hours. After cooling down, the black block material obtained is ground and crushed, and the product is obtained after passing through a 300-mesh sieve. The median diameter of the product is 27.43μm, and the tap density is 2.86g / cm 3 .

[0042] The material was processed into a 053048 battery by the same method as in Example 1, and the electrochemical performance and safety performance of the battery were tested. The specific capacity of the material in the battery is 136mAh / g, the 3.6V platform capacity rate of the battery is 78%, 100 times 1C 5 A The charge-discharge cycle capacity r...

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Abstract

The invention relates to a high-density lithium cobalt oxide power material with a super-large grain diameter. The method comprises the steps of mixing a cobalt compound, a lithium compound or meanwhile a small amount of doping element compounds; sintering for 3 to 30 hours at the high temperature of 950 to 1,100 DEG C to form a block sintered product; crushing and grading the product to obtain the lithium cobalt oxide power material (molecular formula is LiaCo1-bMbO2), wherein, when b is not equal to 0, the middle diameter of the lithium cobalt oxide containing the doping elements is larger than or equal to 15 Mum, and the tap density is higher than or equal to 2.5g/cm<3>; when b is equal to 0, the middle diameter of the lithium cobalt oxide without the doping elements is larger than 20 Mum, and the tap density is higher than or equal to 2.6g/cm<3>. the 3.6V platform capacity rate of the material as the anode active substance for a lithium battery is higher than or equal to 75%; in the thermal impact test in a 150 DEG C thermotank, the lithium battery with the material is free from leakage and does not catch fire or explode for 60 minutes; the 1C5A specific capacity of the material in the battery is larger than or equal to 135mAh/g.

Description

technical field [0001] The invention belongs to the technical field of high-energy power source materials, and in particular relates to a lithium cobalt oxide powder material with super large particle size and high density, which can significantly improve the safety performance and energy density of the lithium ion battery, and a preparation method thereof. Background technique [0002] Lithium-ion battery is an advanced high-energy secondary power supply, which has replaced traditional nickel-cadmium and nickel-metal hydride secondary batteries and has become the driving power of portable appliances such as mobile phones, notebook computers, camcorders, DVDs, PDAs, and MP3s. So far, lithium cobalt oxide has been widely used industrially in the production of lithium-ion batteries by virtue of its high capacity, high voltage, long life, and stable discharge platform. The existing lithium cobalt oxide materials on the market can meet the needs of low-capacity and small battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/58C01D15/00H01M4/525
CPCY02E60/10
Inventor 白厚善刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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