Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode Material with Li1.3Al0.3Ti1.7(PO4)3 Coating

doi:10.16553/j.cnki.issn1000-985x.2025.0126

Abstract

Abstract: The precursor Ni_0.8Co_0.1Mn_0.1O₂（OH）₂ was generated by co-precipitation， and LiNi_0.8Co_0.1Mn_0.1O₂（NCM811）， the cathode material， was prepared by calcination. The coating modification of NCM811 was investigated utilizing various amounts of Li_1.3Al_0.3Ti_1.7（PO₄）₃ （LATP） coating （mass fraction of 1%， 2%， and 3%）. The results show that the capacity retention rate is 84.65% after 350 cycles at 3.0~4.3V， while the capacity retention rate of the uncoated NCM811 is 80.58% when the LATP coating amount is 2%. The rate performance test indicates that the discharge specific capacity of the LATP （2%） sample is 117.1 mAh·g^-1 at 10 C， while the uncoated NCM811 sample has a specific capacity of 101.8 mAh·g^-1. Therefore， we can conclude that an appropriate amount of LATP coating can enhance the lithium ions diffusion rate and optimize the ion transport pathways. Simultaneously， as a coating layer， LATP prevents direct contact between the cathode material and the electrolyte， reducing side reactions. This， in turn， lowers the interfacial impedance and improves the cycling life.

Key words: LATP; LiNi_0.8Co_0.1Mn_0.1O₂; surface coating; ternary cathode material; Ni-rich; coating modification

CLC Number:

TM912

YAO Nianchun, HE Yulin, ZHANG Min, WANG Ziqiang. Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Material with Li_1.3Al_0.3Ti_1.7(PO₄)₃ Coating[J]. Journal of Synthetic Crystals, 2025, 54(12): 2209-2216.

Figures/Tables 11

Fig.1 Schematic diagram of LATP-coated on NCM811

Fig.2 XRD patterns of NCM811 and LATP-coated （1%， 2% and 3%） samples

Table 1 Lattice parameters of the pristine NCM811 and LATP-coated NCM811

Sample	a/Å	c/Å	c/a	I_（003）/I_（104）
NCM811	2.868 0	14.269 1	4.975	1.329
LATP1	2.868 2	14.271 1	4.976	1.332
LATP2	2.869 0	14.269 3	4.974	1.371
LATP3	2.869 0	14.265 0	4.972	1.357

Fig.3 SEM images of NCM811 （a）， LATP1 （b）， LATP2 （c）， LATP3 （d） and EDS mapping of LATP2 （e）~（f）

Fig.4 TEM and HRTEM images of bare NCM811 （a），（b） and LATP2 （c），（d）

Fig.5 Initial charge-discharge curves of different samples

Fig.6 Cycling performances of different samples at 25 ℃

Table 2 Initial charge-discharge capacity and columbic efficiency of different samples at 0.1 C

Sample	Charge capacity/（mAh·g^-1）	Discharge capacity/（mAh·g^-1）	Irreversible capacity/（mAh·g^-1）	Coulombic efficiency/%
NCM811	218.9	176.4	42.5	80.58
LATP1	223.4	181.1	42.3	81.06
LATP2	227.5	192.6	34.9	84.65
LATP3	223.8	184.9	38.9	82.62

Fig.7 Rate capabilities of different samples

Fig.8 EIS results of pristine NCM811 and LATP2 sample. （a） After 5 cycles；（b） after 350 cycles

Table 3 Kinetic parameters of NCM811 and LATP2

Sample	NCM811			LATP2
Sample	R_s/Ω	R_f/Ω	R_ct/Ω	R_s/Ω	R_f/Ω	R_ct/Ω
After 5 cycles	5.757	10.17	15.91	6.662	17.42	31.41
After 350 cycles	9.562	12.09	63.33	3.864	18.41	25.21

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Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Material with Li_1.3Al_0.3Ti_1.7(PO₄)₃ Coating

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