Preparation method of high-capacity lithium nickel cobalt aluminate

A lithium nickel cobalt aluminate, high-capacity technology, applied in the field of lithium ion batteries, can solve the problems of poor electrochemical performance of materials, uneven particle size, difficult process control, etc. Excellent performance

Active Publication Date: 2015-07-22
湖南秒冲新能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-precipitation method can obtain a pure-phase nickel-cobalt-lithium aluminate material with uniform particle size and good electrochemical performance, but its process control is difficult and pollutes the environment
However, the particle size of the material obtained by the traditional high-temperature solid-state method is uneven, the agglomeration phenomenon is serious, and the electrochemical performance of t

Method used

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  • Preparation method of high-capacity lithium nickel cobalt aluminate
  • Preparation method of high-capacity lithium nickel cobalt aluminate
  • Preparation method of high-capacity lithium nickel cobalt aluminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Lithium carbonate, nickelous oxide, cobalt oxide, and aluminum oxide are weighed according to the molar ratio Li: Ni: Co: Al=1:0.8:0.15:0.05 and added to the ball mill tank with a ball-to-material ratio of 8 :1. The mixed raw materials were mixed by ball milling at room temperature for 10 hours, and then under the state of ball milling, the temperature was raised to 500°C at a speed of 10°C / min under the condition of oxygen flow, and ball milled at constant temperature for 5 hours, and then under the state of ball milling, under the condition of oxygen flow The temperature was raised to 750°C at a speed of 8°C / min, and ball milled at this temperature for 15 hours at a constant temperature. After sintering, it was cooled to a lower temperature in the state of ball milling and then released from the furnace to obtain the powder positive electrode material nickel cobalt lithium aluminate. The ball milling speed was 200r / min during the whole sintering process.

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Embodiment 2

[0023] Example 2: Lithium hydroxide, nickel oxide, cobalt oxide, and aluminum hydroxide were weighed in a molar ratio of Li:Ni:Co:Al=1:0.62:0.3:0.08 and added to the ball mill tank with a ball-to-material ratio of 12. :1. The mixed raw materials were mixed by ball milling at room temperature for 5 hours, then under the state of ball milling, the temperature was raised to 400°C at a speed of 12°C / min under the condition of oxygen flow, and ball milled at constant temperature for 6 hours, and then under the state of ball milling, under the condition of air flow The temperature was raised to 800°C at a speed of 10°C / min, and ball milled at this temperature for 20 hours at a constant temperature. After sintering, the powder was cooled to a lower temperature in the state of ball milling and then released from the furnace to obtain the powder positive electrode material nickel cobalt lithium aluminate. The ball milling speed was 150r / min during the whole sintering process.

[0024]...

Embodiment 3

[0025] Example 3: Lithium oxalate, nickel carbonate, cobalt nitrate, and aluminum nitrate were weighed into the ball mill tank according to the molar ratio Li:Ni:Co:Al=1:0.8:0.1:0.1, and the ball-to-material ratio was 15:1. The mixed raw materials were mixed by ball milling at room temperature for 20 hours, and then in the state of ball milling, the temperature was raised to 600°C at a speed of 20°C / min under the condition of air flow, and ball milled at a constant temperature for 10 hours, and then in the state of ball milling, under the condition of air flow, the temperature was The temperature was raised to 900°C at a rate of 15°C / min, and ball milled at a constant temperature for 30 hours at this temperature. After sintering, cooled to a lower temperature in the state of ball milling and then released from the furnace to obtain the powder positive electrode material nickel cobalt lithium aluminate. The ball milling speed was 600r / min during the whole sintering process.

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Abstract

The invention relates to a preparation method of a high-capacity lithium ion battery cathode material of lithium nickel cobalt aluminate. The preparation method comprises: adding a nickel-containing compound, a cobalt-containing compound, a lithium-containing compound, and an aluminium-containing compound into a high temperature-resistant ball-milling tank and performing uniform mixing; putting the tank into a mechanical device capable of heating and rotating; performing ball milling at a room temperature; performing mixing for 5-20h; sintering the reactants in the ball-milling tank in the presence of air flow or oxygen flow at two temperature segments while keeping ball milling, wherein firstly, elevating the temperature to 400-600 DEG C in the presence of air flow or oxygen flow and performing sintering for 2-10h, and elevating the temperature to 700-900 DEG C in the presence of air flow or oxygen flow and performing sintering for 5-30h; performing cooling while performing ball milling till the temperature is relatively low; and opening the device to obtain cathode material powder of lithium nickel cobalt aluminate. The method is simple in technology, and raw materials can be completely mixed through high-temperature ball milling to obtain the cathode material of lithium nickel cobalt aluminate. In a voltage range of 3.0-4.2V and under a rate of 0.2C, the cathode material has an initial discharge specific capacity higher than 180mAH/g and has excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of nickel cobalt lithium aluminate, an anode material of lithium ion batteries, which has excellent electrochemical performance. Background technique [0002] As a new generation of green and environment-friendly power supply, lithium battery has the advantages of light weight, small size, high discharge platform, large capacity, and cycle [0003] With the advantages of long ring life and no memory effect, it is widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles and electric vehicles. At present, the research hotspots of cathode materials for lithium-ion batteries are mainly focused on LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 and Li 4 Ti 5 o 12 on several materials. Traditional LiNi0 2 Although it has a high discharge specific capacity, its preparation is difficult, it is prone to phase change duri...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/1391H01M4/525H01M10/0525Y02E60/10
Inventor 李荐周宏明姚书恒
Owner 湖南秒冲新能源科技有限责任公司
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