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Method for preparing lithium battery anode material precursor

A cathode material and precursor technology, applied in the field of lithium battery material preparation, can solve the problems of low tap density, irregular shape of precursor, large specific surface area, etc.

Inactive Publication Date: 2010-07-14
深圳市天骄科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium nickel manganese cobalt oxide is used as the positive electrode material of lithium battery. Its precursor is obtained by aging reaction directly in the cylinder with nickel, manganese, cobalt salt solution and alkaline solution. After the aging reaction is completed, the obtained precursor is dried. The shape of the precursor produced by the above method is irregular, and the specific surface area is relatively large, and the tap density is relatively low

Method used

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  • Method for preparing lithium battery anode material precursor
  • Method for preparing lithium battery anode material precursor
  • Method for preparing lithium battery anode material precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In Example 1, first add 100ml of a 0.03g / L mixture of sodium dodecylbenzene sulfonate and polyvinyl alcohol into the reaction tank, where the molar ratio of sodium dodecylbenzene sulfonate to polyvinyl alcohol is 1:1, then add the sulphate solution of nickel, manganese, and cobalt with a molar ratio of 0.4:0.4:0.2 (including 3421g nickel sulfate, 2193g manganese sulfate, 1851g cobalt sulfate, 14.5L pure water) 16L and 4mol / L React with 16L of sodium hydroxide, adjust the stirring speed to 200 rpm, the flow rate of the salt solution is 10ml / min, adjust the flow rate of the alkali solution to keep the PH value between 10-11, and carry out the aging reaction. After the reaction is completed, continue to stir After half an hour, put the slurry in the centrifuge, after dewatering, then put it in the oven to dry, get figure 1 , 3 Forebody shown. If the obtained precursor and lithium salt are mixed and ball milled in a certain ratio, and then sintered, Figure 5 The cathode mat...

Embodiment 2

[0031] Example 2: Adding a nickel, manganese, and cobalt sulfate solution with a molar ratio of 0.4:0.4:0.2 (including 3421g nickel sulfate, 2193g manganese sulfate, 1851g cobalt sulfate, 14.5L pure water,) 16L and 4mol / L sodium hydroxide For 16L reaction, adjust the stirring speed to 200 rpm, the salt solution flow rate to 10ml / min, adjust the alkali solution flow rate to keep the pH value between 10-11, and carry out the aging reaction. After the reaction is completed, continue to stir for half an hour. Then put the slurry in a centrifuge, after dewatering, and then put it in an oven to dry. In this example, no surfactant was added to obtain figure 2 , 4 As shown in the precursor, the obtained precursor and lithium salt are mixed and ball milled in a certain ratio, and then sintered to obtain Image 6 The cathode material for the lithium battery shown.

Embodiment 3

[0032] Example 3: First add 100 mL of a mixture of 0.15g / L sodium dodecylbenzene sulfonate and polyvinyl alcohol into the reaction tank, where the molar ratio of sodium dodecylbenzene sulfonate to polyvinyl alcohol is 1:1, then add the nickel, manganese, cobalt sulfate solution with a molar ratio of 0.475:0.475:0.05 to react with 4mol / L of sodium hydroxide 16L, the stirring speed is 150 revolutions / min, and the salt solution flow rate is 8ml / min. The remaining steps are the same as in Example 1, and will not be repeated here. The reaction obtains a nickel-manganese binary precursor doped with cobalt, which has a morphology as Figure 7 Shown.

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Abstract

The invention discloses a method for preparing a lithium battery anode material precursor, which comprises the following steps of: adding a surfactant into a reaction cylinder; adding salt solution of nickel, salt solution of manganese or / and cobalt to carry out aging reaction with alkali solution; and dewatering and drying after the reaction is finished to obtain the lithium battery anode material precursor. The invention provides the method for preparing the lithium battery anode material precursor having regular topography, large specific surface area and high tap density.

Description

Technical field [0001] The invention relates to a method for preparing a lithium battery material, in particular to a method for preparing a precursor of a lithium battery cathode material. Background technique [0002] The cathode material widely used in commercial lithium-ion batteries is mainly LiCoO 2 . LiCoO 2 The discharge platform has high capacity, good cycle performance, easy control of its production process, and stable product performance. But its disadvantage is that Co is toxic and cobalt resources are limited. The raw material price is high and fluctuates greatly. LiMn doped with modified spinel structure 2 O 4 It has the advantages of low price, non-toxicity, and safe use. However, its discharge capacity is relatively low, and its discharge capacity is only about 110mAh / g even under good cycle conditions. Its capacity decays quickly at high temperatures and cannot meet the requirements for use. In addition, LiCoO with a layered crystal structure 2 It may also re...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01G53/00
CPCY02E60/12Y02E60/10
Inventor 王伟东王海涛
Owner 深圳市天骄科技开发有限公司
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