Preparation and Electrochemical Energy Storage Performances of LiNi0.8Co(0.2-2x)AlxMnxO2 Cathode Material†

doi:10.7503/cjcu20170533

Abstract

Abstract:

A series of LiNi_0.8Co_(0.2-2_x₎Al_xMn_xO₂(x=0, 0.005, 0.01, 0.025, 0.04, 0.05) materials was prepared by high temperature solid phase method. The morphology, structures and electrochemical performances of the materials were characterized. The results showed that all the obtained materials had α-NaFeO₂ structure and the degree of lithium nickel cation mixing decreased first and then increased with the increase of manganese, aluminum elements along with cobalt element decreasing. When x was equal to 0.01, the material had the lowest degree of lithium nickel cation mixing, the smallest charge transfer impedance and larger lithium ion diffusion coefficient. And the material exhibited the best electrochemical performances and stability among the obtained materials: its discharge capacity was up to 175.2 mA·h/g at 0.1C; the capacity retention rate was up to 92.7% after 50 cycles at 0.2C.

Key words: High-nickel material, Lithium nickel cation mixing, Electrochemical energy storage performance, Co-doping

CLC Number:

O646

TrendMD:

LI Huan, JIANG Qi, QIU Jiaxin, LIU Qingqing, GAO Yike, LU Xiaoying, HU Ailin. Preparation and Electrochemical Energy Storage Performances of LiNi_0.8Co_(0.2-2_x₎Al_xMn_xO₂ Cathode Material^†[J]. Chem. J. Chinese Universities, 2018, 39(6): 1267.

Figures/Tables 7

Fig.1 XRD patterns of the obtained samples(A) Full patterns; (B), (C) partial magnified. a. NCAM-1; b. NCAM-2; c. NCAM-3; d. NCAM-4; e. NCAM-5; f. NCAM-6.

Table 1 Unit cell parameters of the obtained samples

Sample	a/nm	c/nm	c/a	I₍₀₀₃₎/I₍₁₀₄₎
NCAM-1	0.28682	1.41748	4.9421	1.0456
NCAM-2	0.28691	1.41748	4.9405	1.1867
NCAM-3	0.28690	1.41733	4.9402	1.2267
NCAM-4	0.28683	1.41793	4.9435	1.0569
NCAM-5	0.28717	1.41973	4.9439	0.8933
NCAM-6	0.28700	1.42055	4.9497	0.8013

Fig.2 SEM images of NCAM-3 sample at different magnifications

Fig.3 EIS spectra(A) and Z'-ω-1/2 curves(B) of the obtained samplesThe inset in (A) is the corresponding equivalent circuit.

Table 2 Data of Rct, σ and DLi of the obtained samples

Sample	R_ct/Ω	σ	10¹⁸D_Li/(cm²·s^-1)	Sample	R_ct/Ω	σ	10¹⁸D_Li/(cm²·s^-1)
NCAM-1	112.4	485.1	48.0	NCAM-4	91.6	430.2	61.1
NCAM-2	63.6	202.0	277.0	NCAM-5	104.3	317.1	112.0
NCAM-3	54.5	265.2	160.7	NCAM-6	102.4	1360.3	6.1

Fig.4 First charge-discharge curves(A), cycle curves at 0.2C(B), rate performance curves(C) and first CV curves(D) of the obtained samplesa. NCAM-1; b. NCAM-2; c. NCAM-3; d. NCAM-4; e. NCAM-5; f. NCAM-6.

Fig.5 First CV curves(A) and rate performance curves(B) of the samplesa. NCAM-1; b. NCAM-3; c. NCAM-7; d. NCAM-8.

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Preparation and Electrochemical Energy Storage Performances of LiNi_0.8Co_(0.2-2_x₎Al_xMn_xO₂ Cathode Material^†

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