Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO4/C Cathode Materials for Improved Performance and Favorable Thermostability

doi:10.1007/s40195-021-01331-0

Abstract

Abstract:

An environmentally friendly method for the synthesis of LiMnPO₄/C anode material for lithium-ion batteries by solvothermal method is introduced. The modification of the morphology of this precursor is altered by changing the ratio of the conditioning solvent (water-ethylene glycol solution) and the order of material addition. Ethylene glycol (EG) exerts a considerable influence on synthesizing LiMnPO₄/C flake-like nanocrystal, which benefits the extraction/insertion reaction of lithium ions and improves the electrochemical activity and electrochemical performance of LiMnPO₄/C material. When the solvent composition is H₂O:EG = 1:3, exhibiting exceptional charge/discharge performance and rate capability, the specific discharge capacities are 155.8, 153.7, 148.8, 141.4, 129.5, and 112.6 mAh g^-1 at the 0.1, 0.2, 0.5, 1, 2, and 5 C rates, respectively. When the charge-discharge rate returns to 0.1 C, the LiMnPO₄/C material shows a reversible discharge specific capacity of 153.7 mAh g^-1. Differential scanning calorimetry (DSC) tests verify that the thermodynamic stability of the prepared LiMnPO₄/C(LMP) and commercial LiFePO₄ (LFP)materials is better than that of commercial nickel-cobalt-aluminum (NCA) ternary materials. These prepared LiMnPO₄/C composites have high electrochemical capacity and cycle stability.

Key words: LiMnPO₄/C, solvothermal method, Ethylene glycol, Lithium-ion diffusion, Thermostability

Wei Yang, Xiulian Qiu, Chengyun Wang, Jinhao Ye, Jihua Zhu, Hanbo Zou, Shengzhou Chen. Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO₄/C Cathode Materials for Improved Performance and Favorable Thermostability[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(5): 790-800.

Figures/Tables 10

Fig.1 Schematic diagram of the crystal structure of LiMnPO4

Fig.2 XRD patterns of LiMnPO4/C materials obtained via solvothermal approach in EG system

Table 1 ICP-MS results (Li:Mn:P) of the LiMnPO4 precursor

Element	Mass fraction (wt%)	Mole fraction (mole%)
Li	4.31	33.08
Mn	34.82	33.78
P	19.25	33.14

Fig.3 FTIR spectra of LiMnPO4/C materials prepared in EG system

Fig.4 a-g SEM images of LiMnPO4/C samples prepared in EG solvent system with various volume

Fig.5 a HRTEM, b SAED images of solvothermal LiMnPO4/C with volume ratio of H2O: EG?=?1:3

Fig.6 a-g Charge-discharge curves of LiMnPO4/C samples prepared in EG solvent between 2.5 and 4.5 V at 0.1 C, h rate performances of the LiMnPO4/C samples

Fig.7 a-g CV plots of LiMnPO4/C samples prepared in EG solvent at various scan rates, h linear response of the cathodic peak current (Ip) as a function of square root of the scan rate (ν)

Fig.8 Nyquist plots of LiMnPO4/C samples prepared in EG solvent system

Fig.9 DSC curves of LiMnPO4/C samples prepared in EG solvent system in H2O:EG?=?1:3 solvent system, commercial nickel-cobalt-aluminum (NCA) ternary materials and lithium iron phosphate (LFP) electrodes

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Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO₄/C Cathode Materials for Improved Performance and Favorable Thermostability

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