Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material

A preparation technology of lithium iron phosphate, which is applied in the field of preparation technology for rapid realization of uniform carbon coating of lithium iron phosphate materials, can solve the problem of inability to achieve accurate and controllable temperature of sintered materials, affecting the accuracy and uniformity of material reaction ratio, Reduced phase purity and other issues, to achieve the effects of small particle size, prevention of slurry precipitation, and high-temperature sintering

Inactive Publication Date: 2014-02-12
SHANDONG HETER ELECTRONICS NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, microwave-absorbing heating can be achieved by placing the reaction materials in a medium with strong microwave-absorbing ability. However, the application of the above microwave technology only exists in the high-temperature sintering process. Even though there are many advantages in using microwave technology for high-temperature synthesis, the u...

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  • Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material
  • Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material
  • Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Dissolve 3.58kg of glucose in distilled water with a mass ratio of 1:4 in a stirring tank, and then add 21.96kg of dehydrated FePO 4 and 0.5 times the molar ratio of Li 2 CO 3 , high-speed stirring for 2 hours; after it is evenly mixed, transfer the material to an emulsifier, adjust the speed at 2900r / min, crush and emulsify the slurry, and then transfer it to a microwave compounding equipment, set the temperature at 150°C, and dry the material quickly. Then the dried material was placed in a rotary sintering furnace, pre-flowed with nitrogen for half an hour, and calcined at 750°C for 4 hours to obtain a carbon-coated lithium iron phosphate product.

[0052] The charge and discharge performance test of this example: mix the obtained carbon-coated lithium iron phosphate, acetylene black, and 60.63% polytetrafluoroethylene emulsion according to the ratio of mass percentage 80:15:5, and stir them into agglomerates, and press them into a thickness of Thin slices of 0.05 ...

Embodiment 2

[0054] Dissolve 3.38kg of starch in 26.24kg of distilled water by heating, then add to the mixing tank; weigh 21.96kg of dehydrated FePO 4 , and calculated to weigh 0.5 times the molar ratio of Li 2 CO 3 , put them into the mixing tank together and stir for 2 hours; after the stirring is completed, pour the mixed viscous slurry in the mixing tank into the colloid mill for crushing. After crushing, the material is transferred to the microwave equipment with the track, and the set temperature is 120°C for rapid drying. Then the dried material was placed in a rotary sintering furnace, pre-flowed with nitrogen for half an hour, and calcined at a high temperature of 750°C for 5 hours, cooled naturally, ground and sieved to obtain the carbon-coated lithium iron phosphate product material.

[0055] The electrochemical discharge data of the product obtained in this example is as shown in Table 1, and the electrochemical performance test method of the material is the same as Example 1...

Embodiment 3

[0057] Dissolve 3.28kg of glucose in 26.24kg of distilled water, then add it to the stirring tank; weigh 26.50kg of undehydrated FePO 4 (The dehydration rate of the undehydrated iron phosphate raw material is 17% through laboratory testing), and according to its dehydration rate, calculate and weigh 5.50kg of Li 2 CO 3 , put them into the mixing tank together and stir for 2 hours; after the stirring is completed, pour the mixed viscous slurry in the mixing tank into the colloid mill for crushing. After crushing, the material is transferred to the microwave equipment with the track, and the set temperature is 120°C for rapid drying. Then put the dried material in a rotary sintering furnace, pre-flow nitrogen for half an hour, and pre-calcine at 550°C for 5 hours, then calcinate at 750°C for 5 hours, cool naturally, grind and sieve to obtain carbon Coated lithium iron phosphate product material.

[0058] The electrochemical discharge data of the product obtained in this embodi...

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Abstract

The invention discloses a preparation technique for quickly realizing uniform carbon coating of a lithium iron phosphate material, and the preparation technique mainly comprises the following steps: liquid-phase mixing: dissolving 0.05-0.15 molar ratio of a dissolvable organic carbon source in a dissolvable solution, and then adding a lithium source, an iron source and a phosphorus source into the dissolvable solution in sequence at a molar ratio of (1.0-1.1):1:1; microwave chemical-combination: after the slurry is stirred, discharging the slurry in the presence of continuous stirring, then refining the granularity of the slurry, detecting and controlling the size of grains, thereafter putting the slurry in a microwave device to instantly dry the mixed materials; baking of dried materials: after collection of the dried materials is completed, putting the materials in a high-temperature rotary sintering furnace, then mixing the materials in liquid phase, implementing secondary introduction of the carbon source and microwave chemical-combination, and then putting the materials in a high-temperature furnace for baking the materials at 700-900 DEG C for 4-6 hours, thereby obtaining a carbon-coated lithium iron phosphate material with homogeneous properties and superior performance.

Description

technical field [0001] The invention relates to a preparation process for carbon coating, in particular to a preparation process for quickly realizing uniform carbon coating of lithium iron phosphate materials. Background technique: [0002] Lithium iron phosphate material, as one of the main cathode materials for new lithium-ion batteries today, has the advantages of low price, good thermal stability, abundant sources, and no pollution to the environment. It is an environmentally friendly green energy material. With the increasing depletion of energy worldwide and the deteriorating environment, green energy bases such as lithium iron phosphate materials have gradually been included in the future sustainable development strategy by enterprises and countries. [0003] Generally, the methods for producing lithium iron phosphate materials mainly include solid-phase method and liquid-phase method. The liquid-phase method for preparing lithium iron phosphate cathode material has...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博梁景玲杜显振
Owner SHANDONG HETER ELECTRONICS NEW MATERIAL
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