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Method for preparing LiFePO4/SiC lithium battery positive plate by microwave heating

A microwave heating and lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complicated operation steps and no increase in gram capacity, and achieve the advantages of improving gram capacity, improving electrochemical performance, and increasing roughness. Effect

Inactive Publication Date: 2012-09-12
SHANGHAI JINZHONG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain effect on solving the problem of electrode powder dropping, but it is not ideal, and the operation steps are complicated; and the lithium iron phosphate battery assembled with the positive electrode manufactured by this method has no increase in gram capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) The common commercially available LiFePO 4 Soak in aluminum silicate with a mass concentration of 20% for 3 hours, and fully stir to evaporate the water in the solution; (2) soak the LiFePO 4 Calcined at 500°C for 2h; (3) LiFePO 4 powder, adding relative to LiFePO 4 SiC with a particle size of 5wt% and a particle size of 100μm, the obtained mixture was heated in a microwave oven, the microwave power was adjusted to 500W, and the control time was 25 minutes, and then mixed with binders, conductive agents, additives, solvents, etc. Slurry, coated, dried, rolled, cut, made into LiFePO 4 / SiC lithium battery positive plate.

[0016] The lithium-ion battery positive plate produced in this embodiment is assembled with the negative plate, diaphragm, electrolyte, and battery case according to the conventional process for producing lithium-ion batteries, and the lithium iron phosphate power battery obtained after charging and discharging is activated. The positive elect...

Embodiment 2

[0018] (1) The common commercially available LiFePO 4 Placed in Li with a mass concentration of 30% 2 CO 3 Soak in the solution for 3h, and fully stir to evaporate the water in the solution; (2) soak the LiFePO 4 Calcined at 500°C for 5h; (3) LiFePO 4 powder, adding relative to LiFePO 4 The content of the positive electrode active material is 10wt% SiC with a particle size of 150 μm. The obtained mixture is heated in a microwave oven, the microwave power is adjusted to 500W, and the control time is 10 minutes. etc. to mix and prepare slurry, which is made into LiFePO through coating, drying, film rolling and cutting. 4 / SiC lithium battery positive plate.

[0019] The lithium iron phosphate power battery assembled by using the lithium ion battery positive plate produced in this example, after testing, the powder loss amount of the positive plate and the gram capacity of lithium iron phosphate are shown in the appended tables 1 and 2 at the end of this specification.

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Abstract

The invention discloses a method for preparing a LiFePO4 / SiC lithium battery positive plate by microwave heating. The method is characterized in that: the method comprises the following steps of 1, immersing LiFePO4 in a lithium silicate aqueous solution having mass concentration of 20 to 30% for 2 to 5 hours, fully stirring and evaporating water of the lithium silicate aqueous solution, 2, carrying out calcination of the immersed LiFePO4 at a temperature of 500 DEG C for 2 to 5 hours, 3, adding SiC having particle sizes of 100 to 150 microns into LiFePO4 powder obtained by calcination, wherein a use mount of SiC is 5 to 10wt% of that of LiFePO4, and carrying out uniform ball-milling mixing, 4, heating the mixture obtained by the step 3 in a microwave oven under the conditions of microwave power of 300 to 500W and heating time of 10 to 25 minutes, and 5, mixing the mixture obtained by the step 4, a binder, a conductive agent, an additive and a solvent into slurry, and carrying out coating, drying, rolling and cutting of the slurry to obtain the LiFePO4 / SiC lithium battery positive plate. The method can effectively solve the problem of falling-off of LiFePO4 powder in coating and assembling and can obviously improve electrochemical performances of the LiFePO4 / SiC lithium battery positive plate, and is simple in application and low in cost.

Description

technical field [0001] The invention relates to a method for manufacturing a lithium iron phosphate battery, in particular to a method for preparing LiFePO by microwave heating 4 / SiC lithium battery cathode sheet method. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries. It has been widely used in the power supply of portable electrical appliances such as wireless communication, digital camera, notebook computer, etc., and has broad application prospects as a large-capacity power supply in special application fields such as aerospace, national defense and military industry, field operations, and submarines. [0003] Due to LiCoO 2 The shortage of resources and high price, especially its poor safety, limit its application in the field of power batteries. Lithium iron phosph...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 姜波
Owner SHANGHAI JINZHONG INFORMATION TECH
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