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

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...

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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 use of microwave Heating technology cannot achieve accurate and controllable temperature of sintered materials, and the difference in absorbing ability of different media leads to many side reactions. Molecules with strong absorbing ability rise too fast and grow too much, which affects the reaction ratio of materials. Accuracy and uniformity, reduced phase purity

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