High density ultrafine composite ferric lithium phosphate anode material and preparation method

Abstract

This invention belongs to battery field, which relates to ultra-micro compound lithium iron phosphate cathode material with high density and its fabrication method. Said cathode material is prepared by mixing iron salt, lithium salt and phosphates at a P / Li / Fe ratio of 1-1.1:1-1.1:1-1.1, adding conductive additives containing dopant element and carbon-bearing organic compound, adding organic acid as carrier, adjusting pH, controlling solution temperature in reactor to form sol, separating the sol to obtain nano-precursor and placing it into micorwave oven under protection of inert gas, and obtaining the final product. It is easy to control the chemical component, phase composition and particle size distribution. The conductive additive can be well-distributed. The method also has the advantages of short reaction time, low energy consumption during synthesis process and low cost. The obtained composite has high purity and good compatibility with electrolyte, excellent conductive property and charge and discharge property with large current, and good structure stability,thermal stability and cycle performance.

Description

[0001] Field: [0002] The invention relates to a high-density ultramicro-composite lithium iron phosphate positive electrode material and a preparation method thereof, which belong to the field of batteries, and in particular to a high-density nanoscale composite lithium iron phosphate lithium ion positive electrode material and a preparation method thereof. Background technique [0003] Lithium-ion batteries have the characteristics of high cell voltage, high energy density, no memory effect, safe use, and wide operating temperature. They have been widely used in mobile phones, notebook computers, electronic instruments, UPS, and various portable electric tools. [0004] Cathode materials are an important part of lithium-ion batteries. So far, commercial lithium-ion battery cathode materials still mainly use LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . to LiCoO 2 However, the existing problems are that the price of lithium cobalt oxide is high due to the lack of cobalt resources, a...

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Problems solved by technology

to LiCoO 2 However, the existing problems are that the price of lithium cobaltate is high due to the lack of cobalt resources, and its thermal stability is poor and cobalt is harmful to the environment.

The advantage of the high-temperature method is that it is easy to realize industrial production, but the particle size distribution and irregular shape of the reaction product are difficult to achieve nanoscale

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