The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite

Abstract

Olivine-type LiFePO 4 composite powders with carbon were synthesized by freeze drying and subsequent thermal annealing. The main purpose of the research is to explore how various dicarboxylic acids as carbon sources influence the electrochemical properties of the resulting composites. Three dicarboxylic acids (oxalic, malonic, and adipic) were used as a carbon source. The synthesis was followed by X-ray powder diffraction, scanning electron microscopy, particle-size analysis, and electrochemical experiments. It is shown that the amount of the in situ formed carbon depends on the thermal behaviour of the acids in inert atmosphere rather than on their carbon content. Cyclic voltammetry experiments and galvanostatic cycling illustrate the behaviour of different powders: the powder obtained with oxalic acid yields the highest discharge capacity at small currents, while the one obtained with adipic acid shows better high-current response. Malonic acid has turned out to be a poor carbon source and it consequently yields powder with poor electrochemical performance.

Synthesis and optimization of three-dimensional lamellar LiFePO 4 and nanocarbon composite cathode materials by polyol process

“…All of the XRD patterns show well crystallized diffraction peaks, which could be indexed to an orthorhombic olivine-type phase (JCPDS No. 40-1499) [26,27]. No other impurity phases are found and no carbon diffraction peak appears, indicating that no impurities were produced in the polyol process and subsequent heat treatment and the incorporation of low content of graphene and carbon nanotube had no influence on the main crystal phase of LFP [11,13].…”

Mid–Long Chain Dicarboxylic Acid Production via Systems Metabolic Engineering: Progress and Prospects

“…Dicarboxylic acids (DCAs) have a wide range of applications in many fields, including the synthesis of organic compounds, chemical manufacturing, industrial production, food and drug manufacturing, and agricultural production. Moreover, their derivatives also serve as key components in products of daily use. − For example, azelaic acid (AZA) has several benefits, including its antibacterial, anti-inflammatory, and keratolytic effects, which make it useful for the treatment of acne . Sebacic acid (SA) acts as the basic substrate for the production of polyamide-4,10, polyamide-5,10, polyamide-10, and polyamide-10,8.…”

Facile synthesis and electrochemical performances of secondary carbon-coated LiFePO4-C composite for Li-ion capacitors based on neutral aqueous electrolytes

“…In order to solve these problems, improvement strategies have been employed such as coating carbon on the LFP particles, reducing the particle size and doping with guest elements [18][19][20][21][22]. In this work, we investigated the morphology and electrochemical performances of secondary carbon-coated LFP-C composite synthesized by the facile two-step method.…”