Compatibility of LiODFB Electrolyte with LiNi0.5Mn1.5O4 as High-voltage Cathode Material

doi:10.11901/1005.3093.2014.150

Chinese Journal of Materials Research

2014, Vol. 28

Issue (10): 775-780 DOI: 10.11901/1005.3093.2014.150

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Compatibility of LiODFB Electrolyte with LiNi_0.5Mn_1.5O₄ as High-voltage Cathode Material

Hongming ZHOU^1,²,Wenjun GENG¹,Jian LI^1,^2,^**(

),Jie YANG²,Shuheng YAO¹,Wenjiao SUN¹

1. School of Materials Science and Engineering, Central South University, Changsha 410083
2. Hunan Province Zhengyuan Energy Storage Materials and Devices Research, Changsha 410083

Cite this article:

Hongming ZHOU,Wenjun GENG,Jian LI,Jie YANG,Shuheng YAO,Wenjiao SUN. Compatibility of LiODFB Electrolyte with LiNi_0.5Mn_1.5O₄ as High-voltage Cathode Material. Chinese Journal of Materials Research, 2014, 28(10): 775-780.

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Abstract

The compatibility of lithium di?uoro(oxalato)borate (LiODFB) electrolyte with LiNi_0.5Mn_1.5O₄ as high-voltage cathode material was investigated by cyclic voltammetry, charge-discharge test and AC impedance. The results show that the LiNi_0.5Mn_1.5O₄/Li half cells with LiODFB or LiPF₆ as electrolyte all have simple REDOX peak at 25℃ and 60℃, and the battery has an excellent reversibility. The battery with LiODFB has better cycle performance than that with LiPF6 at 25℃ and 60℃. Their 0.5C initial discharge specific capacities at 25℃ are 126.3 mAh?g^-1 and 131.6 mAh?g^-1, and the capacity retention ratios by the 100th cycle are 97.1 % and 94.7% respectively. The 0.5 C initial discharge specific capacities at 60℃are 132.6 mAhg^-1 and 129.1 mAhg^-1, and capacity retention ratios by the 100th cycle are 94.1% and 81.7% respectively. AC impedance plots also show that the battery with LiODFB has a lower charge-transfer resistance than that with LiPF6 at 60℃, indicating that the battery with LiODFB has excellent cyclic performance at high temperature.

Key words: foundational discipline in materials science lithium di?uoro(oxalato)borate LiNi_0.5Mn_1.5O₄ electrochemical performance compatibility

Received: 01 April 2014

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	Hongming ZHOU
	Wenjun GENG
	Jian LI
	Jie YANG
	Shuheng YAO
	Wenjiao SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.150 OR https://www.cjmr.org/EN/Y2014/V28/I10/775

Fig.1 CV curves of LiNi_0.5Mn_1.5O₄/Li cells at 25℃ (a) and 60℃ (b)

Fig.2 Initial charge-discharge curves of LiNi_0.5Mn_1.5O₄/Li cells at 25℃ (a) and 60℃ (b)

Fig.3 Cycle performance of LiNi_0.5Mn_1.5O₄/Li cells at different rates

Fig.4 Cycle performance of LiNi_0.5Mn_1.5O₄/Li batteries at 25℃ (a) and 60℃ (b)

Fig.5 EIS results of LiNi_0.5Mn_1.5O₄/Li cell after and before cycle

Fig.6 Equivalent circuit of AC impedance for electrolyte

Table 1 Resistance of LiODFB and LiPF₆at different temperatures

Fig.7 SEM images of LiNi_0.5Mn_1.5O₄ electrode from LiNi_0.5Mn_1.5O₄/Li cells after-before cycle, (a) before cycling, (b) LiODFB half cell after 100 cycles at 60℃, (c) LiPF₆ half cell after 100 cycles at 60℃

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