A three-dimensional porous LiFePO₄ cathode material modified with a nitrogen-doped graphene aerogel for high-power lithium ion batteries

Abstract

LFP@N-GA with (010) facet oriented LFP NPs embedded in N-GA provides both rapid Li+ and electron pathways in the electrode as well as short Li+ diffusion length in LFP crystals.

Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO4 nanoplates as the positive electrode material of lithium-ion batteries

“…[1][2][3] However, further improvements on power and energy density of the current LIB are still needed to meet the demand of wide application in electric vehicles and hybrid electric vehicles. [4][5][6] The performances and costs of LIB are greatly dependent on the positive electrode materials.…”

“…2,5,6 Nevertheless, the electrochemical performances of LFP are heavily limited by the inherent sluggish kinetics originated from its low electronic and ionic conductivity. 6,7 Numerous efforts have been tried to overcome these limitations of LFP by doping alien atoms, 8,9 decreasing the particle size, 10,11 optimizing the morphology, 2,3,7,12 and adding conductive phases. 2,13,14 Though decreasing the LFP particle size to nanoscale has been demonstrated to be effective to improve its specific capacity, relatively low tap density and volumetric energy density are usually obtained, and the nanoscale materials tend to agglomerate and show poor thermal and poor cycling stability during long-term uses.…”

Preparation of Three-Dimensional LiMn2O4/Carbon Composite Cathodes Via Sol-Gel Impregnation and Their Electrochemical Performance in Lithium-Ion Battery Application

“…[8][9][10] Starting point for those composite cathodes is either a 3D structured solid electrolyte framework [11][12][13][14] or an electrically conducting matrix. The latter can be either a metal foam 15,16 or a carbon backbone, 17,18 which is filled with active material by electrodeposition, spray-coating or via a sol-gel process.…”

Vanadium-oxide-based electrode materials for Li-ion batteries

“…The LiFePO4 materials with oriented growth along the (010) facet have been particularly interesting nanostructures, which can effectively shorten Li + diffusion length and increase the number of active sites accessible to lithium ions. [93,96] ions.…”

“…[87] Various approaches have been introduced to overcome the drawbacks of LiFePO4, including element doping, [82,88] reducing particle size, [89][90][91][92] and surface modification with conductive materials. [93][94][95] Regarding a successful element doping, the doped cations should reside on the iron sites. [86] If the alien ions are located in the lithium sites, the onedimensional lithium diffusion can be easily interrupted by these alien ions.…”