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Process for preparing lithium ion cell positive pole material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as high risk, decreased reversible capacity, and large sintering amount, and achieve good high-temperature performance and good room-temperature cycle performance.

Inactive Publication Date: 2007-11-14
SHANGHAI CHUANNA BATTERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Of the above three methods, the process of method 2 is relatively complicated, and it is difficult to realize industrialization; method 1 is effective, but with the increase of doping amount, although the stability improves, the reversible capacity of the material decreases, and the equipment used for sintering , the box furnace is too small, it can only sinter to a dozen kilograms at one time, the tunnel kiln is too large, and it can sinter up to tons at a time, which is too much for an enterprise that only needs to supply its own materials, and there is a risk of too much sintering at one time larger

Method used

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Examples

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Effect test

Embodiment 1

[0033] Lithium carbonate Li 2 CO 3 And manganese oxide MnO 2 Mix uniformly according to the ratio of Li / Mn 0.95:2 to obtain a homogeneous mixture of the cathode material precursor. The cathode material precursor mixture is heated in a sintering furnace at a heating temperature of 700°C; pump 5 is started, and the furnace is heated by pump 5. The internal gas is drawn out and air is introduced to make the temperature difference in the furnace less than ±3°C for 2 hours. Turn off the pump 5 to maintain the temperature at 700°C; then heat the sintering furnace to increase the temperature of the sintering furnace to the final sintering temperature of 750°C. And keep it for 20 hours; after the sintering is completed, start the pump 5 again, pump out the gas in the furnace through the pump, and introduce oxygen for 2 hours. When the oxygen concentration is 50%, the rapid cooling temperature is 5℃ to obtain the average particle size 10~15μm lithium-deficient type lithium manganate Li 0.9...

Embodiment 2

[0041] Preparation of a lithium-ion battery cathode material: In a ball mill, lithium hydroxide LiOH and manganese oxyhydroxide MnOOH are uniformly mixed at a Li / Mn ratio of 0.95:2, and the remaining steps are the same as in Example 1, to obtain a lithium-ion battery cathode material Lithium manganese oxide.

Embodiment 3

[0043] The preparation of a lithium ion battery cathode material: LiOH, manganese oxide MnO are combined in a ball mill 2 , Aluminum hydroxide Al(OH) 3 Mix uniformly according to the ratio of 0.95:1.95:0.05, and the rest of the steps are the same as in Example 1, to obtain lithium manganate as the cathode material of the lithium ion battery.

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Abstract

The invention relates to a kind of preparation craft of anode material of lithium ion battery: keep temperature in the stove equal through entering pump to make it into microcirculation; the anode material of lithium manganese oxide is made by agglomeration for two times; the characteristic of this craft is that, goes into the first agglomeration under the state short of lithium, enter air or oxygen through microcirculation during agglomeration; mix surplus lithium salts and outcome of ball milling for the first agglomeration equally, goes into agglomeration for second time to get lithium manganese oxide which is anode material of lithium ion battery. The invention improves reversibility of circulation and capability of high temperature of the anode material of lithium ion battery effectively and influence charge discharge capacity little. The craft of the invention is simple and practical, the cost is low and it is propitious to industrial production of scale. Lithium ion battery material made by this method can apply to field broadly such as mobile telephone, notebook computer,minitype of video recorder electromotion cars broadly and so on.

Description

Technical field [0001] The invention relates to a preparation process of a positive electrode material for a lithium ion battery, and more specifically to a production equipment and a preparation process thereof for the positive electrode material used in polymer lithium ion batteries and lithium ion secondary batteries. Lithium-ion battery materials can be widely used in mobile phones, notebook computers, small camcorders, electric vehicles and other fields, and belong to the technical field of lithium-ion battery cathode materials. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s, and has now become the focus of research and development in various countries around the world. Layered and spinel-type lithium transition metal oxides are considered to be the preferred cathode materials for high energy density lithium ion batteries. [0003] The cathode material is an important part of the lith...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/58H01M4/505
CPCY02E60/10
Inventor 赵新兵涂健曹高劭师绍纯吴照金谢健朱福君
Owner SHANGHAI CHUANNA BATTERY MFG
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