Microwave solidification preparation technology of lithium ion anode-cathode material

A microwave curing and cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of uniformity of distribution affecting the performance uniformity of finished products, etc., to increase the depth of microwave transmission, prevent sedimentation, and facilitate uniform nucleation and nucleation. The effect of uniform growth

Active Publication Date: 2013-12-25
SHANDONG GOLDENCELL ELECTRONICS TECH
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AI Technical Summary

Problems solved by technology

[0008] In the process of microwave use, the polarity of the material, the uniformity of the distribution of the large dielectric constant solvent and the uniformity of microwave irradiation all affect the uniform

Method used

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  • Microwave solidification preparation technology of lithium ion anode-cathode material
  • Microwave solidification preparation technology of lithium ion anode-cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of lithium iron phosphate material:

[0029]Weigh 114.72kg, 28.98kg, and 18.132kg of iron phosphate, lithium carbonate, and glucose after drying, put them into a mixing tank, add 70L of distilled water, and then turn on the mixer to stir at high speed. After stirring for 2 hours, pump the slurry to the colloid mill to feed mouth, adjust the gear gap to 2 μm, and finely crush the slurry obtained by stirring to obtain a viscous fluid slurry. After high-temperature compounding at 150°C in a microwave compounding furnace protected by nitrogen, a cake-shaped powder material full of pores is obtained. , collect all the powder materials and transfer them into a rotary sintering furnace, pre-flow nitrogen for 30 minutes, and then sinter at 700°C for 6 hours. After the materials are cooled with the furnace, they are ground and sieved to obtain the lithium iron phosphate cathode material. The charge and discharge performance test of this example: mix the obtained carb...

Embodiment 2

[0034] Preparation of nickel cobalt lithium manganese oxide material:

[0035] After nickel hydroxide cobalt manganese was vacuum-dried as the precursor for 30min, the mass was weighed under cooling, and the precursor and lithium salt were weighed according to the reaction ratio of 1: 1.15 in the molar ratio of precursor and lithium ion, and a total of 80.794kg was added, and 40kg of Deionized water, and then put it into the stirring equipment and mix for 2 hours. After the stirring is completed, pump the slurry to the colloid mill, adjust the gap between the colloid mill to 2 μm, carry out pulverization and refinement, and put the obtained viscous slurry into a microwave oven. Under certain conditions, the temperature range of the microwave equipment is adjusted to 120°C for instant curing, and finally a block material with a porous structure inside is obtained, and then the material is transferred into a sagger. Set the muffle furnace program to 800°C, and sinter for 15 hour...

Embodiment 3

[0040] Preparation of lithium nickel manganese oxide material

[0041] Accurately weigh 12.6kgLi2CO3, 9.8kgNiO and 42.9kgMnO2 and place them in a stirring tank, add 22.7L of distilled water as a dispersant, and after stirring for 2 hours, use an emulsifier to emulsify the obtained slurry to obtain a viscous fluid. The material was transferred to a microwave oven for rapid drying. The dried material was placed in a sagger and calcined at 850°C for 5 hours in an air atmosphere. After calcination and cooling, transfer the material into a stirring tank, continue to add NiO according to the ratio of the introduced nickel content to the existing nickel content of 0.15:0.40, and add 30L distilled water as a dispersant at the same time, and repeat the above operation after stirring for 2 hours. The dried material was placed in a sagger, calcined at 850°C for 10h in air atmosphere, and then annealed at 600°C for 10h. After the material is cooled with the furnace, it is ground and sie...

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Abstract

A microwave solidification preparation method of a lithium ion anode-cathode material comprises the steps of raw material pretreatment: sequentially adding reaction materials into a polar molecule solvent according to a particular reaction proportion, quickly stirring with stirring equipment to allow the materials to be mixed uniformly, controlling viscosity of the materials to ensure flowability of slurry, and realizing a refined and controllable particle size of the materials with a grinding and emulsification device to allow the obtained uniform slurry to be good in homogeneity and strong in microwave penetrating power, microwave chemical combination-instant solidification, dry material roasting: after collecting a dry material, putting the material into a high-temperature sintering furnace, precharging protective gas for 30-60min, roasting for 2-18h at 700-900 DEG C, or sintering for 1-5h at 300-600 DEG C, then roasting for 2-18h at 700-900 DEG C, and obtaining the lithium ion anode-cathode material with uniform properties and superior performances.

Description

technical field [0001] The invention relates to a preparation process of a powder material, in particular to a microwave solidification preparation process of a lithium ion positive and negative electrode material. Background technique [0002] The preparation methods of common powder materials mainly include: solid-phase method and liquid-phase method; and mechanical method is a commonly used one in solid-phase method. A new interface facilitates the synthesis of new substances; for example, ball milling is a commonly used mechanical method. As the most commonly used method so far, the solid phase method has the advantages of simplicity, good filling performance, and easy control of the process for preparing powder materials, but the obtained materials usually have defects such as uneven particle distribution and impure phase, which cannot be applied to Preparation of high-end and high-performance quality materials. [0003] The liquid phase method is to use soluble metal...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/10
Inventor 关成善宗继月孟博杜显振梁景玲
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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