A Facile Way To Synthesize Carbon-Coated LiMn_0.7Fe_0.3PO₄/Reduced Graphene Oxide Sandwich-Structured Composite for Lithium-Ion Batteries

Abstract

We develop a facial and highly efficient way to synthesize carbon-coated LiMn 0.7 Fe 0.3 PO 4 (LMFP)/reduced graphene oxide (rGO) sandwich-structured composite (LMFP/rGO@C), which is fabricated by the direct sonication of LMFP nanoparticles, graphite oxide, and carbon source together followed by heat treatment for the formation of carbon coating layer and the reduction of graphene. All the LMFP nanoparticles are found to prefer to anchor onto the top and bottom surfaces of exfoliated GO homogeneously, forming separately sandwiched structure without agglomeration. The prepared LMFP/rGO@C sandwich-structured composite exhibits an excellent rate capability (discharge capacity of ∼90 mAh g −1 at 30 C) and good cyclability (discharge capacity of 105 mAh g −1 after 500 cycles), whereas simply carbon-coated LMFP only shows a discharge capacity of ∼13 mAh g −1 at 30 C and 91 mAh g −1 after 500 cycles. This finding paves an efficient way to synthesize graphene-based composite with high performances for lithium-ion batteries.

Surface Modification Engineering Enabling LiMnxFe1−xPO4 Cathode Against Aggressive Cathode Chemistries for Excellent Performance Lithium‐Ion Batteries

“…This is principally attributed to its numerous advantages, encompassing cost-effectiveness, excellent cycle performance, and remarkable thermal stability. [12,13] Nonetheless, the further advancement of LFP is hindered by its relatively low voltage platform (3.4 V vs. Li + /Li) as well as its energy density limitations (586 W h kg À 1 ). [14,15] In comparison, LiMnPO 4 (LMP) has sparked broader interest among researchers, primarily attributable to its notably elevated voltage platform (4.1 V vs. Li + /Li), which can effectively enhance its energy density to ~701 W h kg À 1 .…”

“…As a highly representative cathode material, LiFePO 4 (LFP) with olivine structure has been extensively researched in commercial applications over the past few decades. This is principally attributed to its numerous advantages, encompassing cost‐effectiveness, excellent cycle performance, and remarkable thermal stability [12,13] . Nonetheless, the further advancement of LFP is hindered by its relatively low voltage platform (3.4 V vs .…”

Contribution of Ti-Doping to the Cyclic Stability of LiFe0.6Mn0.4PO4/C

“…13 However, LFMP still faces challenges such as low electronic conductivity, sluggish lithium-ion diffusion rates, and the Jahn−Teller effect associated with Mn 3+ . 14,15 In order to solve the problems of LFMP, researchers have implemented various strategies, such as carbon coating, controlling particle morphology, and reducing particle size, which can markedly enhance the electrochemical attributes of the materials. 16 Although these measures have been employed, they have not been effective in enhancing the intrinsic electronic and ionic conductivity of LFMP material.…”

Multiscale Researches on Lithium Ion and Lithium Metal Batteries

“…(1) Interfacial analysis between cathode and electrolyte in LIB by using in-situ FTIR method. [5][6][7][8][9][10][11][12][13][14] (2) Preparation of LiFePO4 (LFP)with carbon coating as CEI [15][16][17][18][19][20][21][22][23][24][25][26] (3) Interfacial analysis on lithium metal anode for SEI [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] (4) Preparation of 3 Dimensionally Ordered Macroporous (3DOM) separator and its application to lithium metal battery [47][48][49][50][51][52][53]…”

“…Figure15 Tafel plot for LiCoO2 in a mixed solvent ethylene carbonate and propylene carbonate containing 1.0 mol dm-3 LiClO4.…”