Synergetic effect of Na-doping and carbon coating on the electrochemical performances of Li_3−xNa_xV₂(PO₄)₃/C as cathode for lithium-ion batteries

Abstract

Carbon coated Li3−xNaxV2(PO4)3/C (x = 0.04, 0.06, 0.10, 0.12, 0.18) cathode materials for lithium-ion batteries were synthesized via a simple carbothermal reduction reaction route using methyl orange as the reducing agent.

Surface and Interface Modification of Electrode Materials for Lithium-Ion Batteries With Organic Liquid Electrolyte

“…And the activated porous carbon coated LFP (LFP/AC-P4) presents the increased Li-ions diffusion coefficient and low charge transfer resistance (Tian et al, 2020). Hence, it is disclosed that carbon coating is an important method to fabricate composites, which is able to be achieved by introducing a carbon source, such as graphene oxide (GO) (Huo et al, 2017), glucose (Zhang et al, 2017;Wang M. et al, 2019;He et al, 2020), sucrose (Chen et al, 2019;Park et al, 2019), pitch (Hsieh and Liu, 2020), cotton (Deng et al, 2019), ethylene glycol (Lin et al, 2008), and methyl orange (Yan et al, 2019), as raw materials. Besides, in the field of all-solid-state batteries, except the reconstruction of composite electrode materials, the controllable adjustment to composite solid electrolytes can effectively optimize the electrolyte interface.…”

“…In non-metal doping combined with carbon coating, N doping (Duan et al, 2019;Jiang et al, 2019;Liu X. et al, 2019;Nanthagopal et al, 2019;Park et al, 2019;Sun et al, 2019;Wang Y. et al, 2019) is proven to result in a better effect, followed by P doping (Zhang et al, 2019). Na doping (Yan et al, 2019) as the metal doping is also widely applied. For LFP as typical cathode materials, after the simple surface carbon coating modification, if the charge distribution on the electrode surface is not uniform under the condition of high rate charge and discharge, the utilization efficiency of active substance would decrease.…”

“…The optimal result displays that the synergetic effect between Na-doping and carbon coating offers enlarged Li+ diffusion channels. The doped Na can substitute the surface active sites and the coated carbon increases the electronic connecting of particles (Yan et al, 2019).…”

Preparing Li6V3(PO4)5 Cathode with Boron‐Doped Carbon Layer as a Cathode Material for Lithium‐Ion Batteries

“…It falls into two categories, namely, metal cation doping and nonmetal anion doping. [11][12][13][14][15][16] Yan et al [17] constructed a series of Na þ -doped Li 3Àx Na x V 2 (PO 4 ) 3 /C materials using methyl orange as both a Na source and a carbon source. Similarly, Chen et al [18] synthesized Ni 2þ -doped Li 3 V 2Àx Ni x (PO 4 ) 3 .…”

Manipulating Li3V2(PO4)3 cathode grains and conductivity with halloysite nanotubes and carbon layer toward durable lithium ion batteries

“…[6,7] Under the PO 4 anion framework, V 5+/4+ exhibited the highest voltage of 4.6 V vs. Li/Li + , and the theoretical specific capacity of monoclinic Li 3 V 2 (PO 4 ) 3 (LVP) is as high as 197 mAh g À1 at 3.0-4.8 V. [8,9] However, in the LVP crystal structure, VO 6 is separated by PO 4 , which results in low electronic conductivity of LVP. [10,11] Aiming at the deficiencies of LVP materials, its solutions mainly focus on improving the electronic conductivity and ion diffusivity, such as surface coating of electronic conductors, [12][13][14] ion doping modification, [15,16] and preparation of special nanostructures. [17,18] In recent years, carbon nanotubes have attracted more and more attention in the field of batteries due to their unique hollow tubular structure, excellent charge transport properties, and chemical and mechanical stability.…”