过充保护添加剂1,2-二甲氧基-4-硝基苯和1,4-二甲氧基-2-硝基苯在锂离子电池中的应用

doi:10.3866/PKU.WHXB201206142

Abstract

Abstract:

1,2-Dimethoxy-4-nitro-benzene (DMNB1) and 1,4-dimethoxy-2-nitro-benzene (DMNB2) were selected as new redox shuttle additives for overcharge protection in lithium-ion batteries. The base electrolyte is 1 mol·L^-1 LiPF₆/(ethylene carbonate (EC)+diethyl carbonate (DEC)+ethyl-methyl carbonate (EMC) (1:1:1, by volume)). Cyclic voltammetry (CV), charge-discharge cycle performance, overcharge tests, electrochemical impedance spectra (EIS), and scanning electron microscopy (SEM) were used to investigate the electrochemical performances of DMNB1 and DMNB2. The overcharge protection of DMNB1 and DMNB2 on lithium-ion batteries and the compatibility of both additives with the LiNi_1/3CoMn_1/3O₂ electrode have been studied. The results show that the working potentials of the both additives are above 4.3 V (vs Li/Li⁺), and thus are suitable for overcharge protection in lithium-ion batteries. Lithium-ion batteries with DMNB1 and DMNB2 have an improved overcharging tolerance. DMNB1 shows better overcharge protective performance, in the 100% overcharge and 5 V cutoff voltage tests, than DMNB2. After 100 cycles at 0.2C rate, the capacity retention rates of the LiNi_1/3Co_1/3Mn_1/3O₂/Li cells with the base electrolyte and the electrolyte with DMNB1 and DMNB2 are 98.4%, 95.9%, and 68.1%, respectively. The electrochemical properties and the location of the nitro-group on the benzene of the overcharge protection additives are closely linked.

Key words: Overcharge, Redox, Dimethoxy-benzene, Electrolyte, Safety additive

MSC2000:

O646

REN Chun-Yan, LU Hai, JIA Ming, ZHANG Zhi-An, LAI Yan-Qing, LI Jie. Application of 1,2-Dimethoxy-4-nitro-benzene and 1,4-Dimethoxy- 2-nitro-benzene as Overcharge Protection Additives in Lithium-Ion Batteries[J].Acta Phys. -Chim. Sin., 2012, 28(09): 2091-2096.

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Application of 1,2-Dimethoxy-4-nitro-benzene and 1,4-Dimethoxy- 2-nitro-benzene as Overcharge Protection Additives in Lithium-Ion Batteries

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