A three-dimensional carbon-coated LiFePO4 electrode for high-power applications

Abstract

The fabrication process of a new, threedimensional carbon-coated LiFePO 4 electrode by sol-gel synthesis in situ on interconnected conducting fibers of carbon paper is described. This three-dimensional structure ensures overall electrode conductivity, facilitates lithium diffusion in and out of LiFePO 4 particles and, hence, enables good cycling stability at 1C-rate and maximum pulse-power values that exceed those of planar LiFePO 4 electrodes at high electrode loading.

High surface area templated LiFePO4from a single source precursor molecule

“…These results are consistent with reports by Arbizzani et al for sol-gel derived LiFePO 4 and those of Beninati et al where microwave synthesis gave rise to finely agglomerated active material and enhanced utilisation and power output. 44,45 The reversible Li + charge insertion/extraction of the mesoporous LiFePO 4 /carbon composite was investigated via electrochemical cyclic voltammetry. Depicted in Fig.…”

Triple carbon coated LiFePO4 composite with hierarchical conductive architecture as high-performance cathode for Li-ion batteries

“…The evaporation of the suspension is rapid and yielded homogeneous and micro-spherical aggregates of precursor by spray-drying technology, which is considered an attractive route that exhibits superior performance including energy savings, cost effectiveness, continuous preparation and environmental safety [31]. (3) In the carbothermal reduction step, the carbon from degradation and carbonization of starch and phenolic resin provide a special environment that is favourable for the reduction of Fe(III) and for the formation of the LiFePO 4 nanocrystalline [32]. As shown in the microscale of LiFePO 4 composite, the carbon coated LiFePO 4 nanoparticles are the primary conductive units and the graphene wrapped LiFePO 4 /C nanoparticles give larger secondary conductive structures denoted as microspheres [33].…”

Oscillatory Thermopower Waves Based on Bi2Te3 Films

“…Conventional batteries have low rates of energy discharge and limited specific power of approximately 0.2 kW kg −1 . Although recent reports on electrochemical technologies such as Li‐ion‐phosphate batteries suggest that they can now reach a specific power as high as 10 kW kg −1 , their size reduction rapidly diminishes the specific power 4. At micrometer dimensions, their operation deteriorates because of the effects of ionic layers near electrodes and the disruption of ionic flow 5…”