Electrochemical Performance of Lithiophilic Electrolyte in LiNi0.6Mn0.2Co0.2O2/Li Rechargeable Lithium Metal Battery

doi:10.19894/j.issn.1000-0518.210090

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (02): 298-306.DOI: 10.19894/j.issn.1000-0518.210090

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Electrochemical Performance of Lithiophilic Electrolyte in LiNi_0.6Mn_0.2Co_0.2O₂/Li Rechargeable Lithium Metal Battery

Du-Bin HUANG¹^,³(), Pei-Min WANG², Jin-Long WU³

^1.Zhejiang Gold Feather New Energy Technology Co. , Ltd. , Huzhou 313300, China
^2.Geely University of China, Beijing 102202, China
^3.Beijing Gold Feather New Energy Technology Co. , Ltd. , Beijing 100015, China

Received:2021-03-02 Accepted:2021-06-25 Published:2022-02-10 Online:2022-02-09
Contact: Du-Bin HUANG

Abstract

Abstract:

Lithium metal batteries are considered to be the next generation high-energy-density batteries with good prospects. However, the traditional carbonate-based electrolyte has poor compatibility with lithium, and the lithium metal battery has fast capacity decay due to the growth of lithium dendrites and the instability of the solid electrolyte interface (SEI) during cycling. Using 1.2 mol/L lithium hexafluorophosphate (LiPF₆) /lithium difluorooxalate (LiDFOB) /fluoroethylene carbonate (FEC) /diethylcarbonate (DEC), and lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) added as an electrolyte, the electrochemical performance of LiNi_0.6Mn_0.2Co_0.2O₂/40 μm-Li battery (ratio of negative to positive capacity per unit area N/P=2.85) was studied. The LiNi_0.6Mn_0.2Co_0.2O₂/40 μm-Li battery exhibits excellent cycle stability (after 120 cycles, the capacity retention>93%) and rate performance (the specific discharge capacity is 110 mA·h/g at 3 C). The good electrochemical performance is mainly due to the fact that the electrolyte can form a dense and stable SEI on the surface of metal lithium and inhibit the generation of lithium dendrites.

Key words: Lithium metal battery, Lithium bis (trifluoromethanesulfonyl) imide, LiNi_0.6Mn_0.2Co_0.2O₂, Thin lithium

CLC Number:

O646.5

Du-Bin HUANG, Pei-Min WANG, Jin-Long WU. Electrochemical Performance of Lithiophilic Electrolyte in LiNi_0.6Mn_0.2Co_0.2O₂/Li Rechargeable Lithium Metal Battery[J]. Chinese Journal of Applied Chemistry, 2022, 39(02): 298-306.

Figures/Tables 8

Fig.1 Conductivity of different electrolytes at－20～60℃（A）；Li／Li symmetric cells with different electrolytes（B）

Fig.2 Cycling performance of NCM622／Li cells in different electrolytes（A）and voltage profiles of NCM622／Li cell in E-0（B），E-1（C），E-2（D），E-3（E）and CE（F）electrolytes

Fig.3 Rate capability of NCM622／Li cells in different electrolytes（A）and rate voltage profiles of NCM622／Li cell in E-0（B），E-1（C），E-2（D），E-3（E）and CE（F）electrolytes

Fig.4 The AC impedance diagram and equivalent circuit diagram of NCM622／Li full cells in different electrolytes at the 5th cycle（A）and 30th or 50th cycle（B）

Table 1 Resistance analysis of NCM622／Li cells

电解液	圈数	欧姆内阻	电荷转移内阻	扩散内阻	扩散系数
Electrolyte	Cycles	Ohmic resistance R₁／（Ω·cm²）	Charge transfer resistance R₂／（Ω·cm²）	Diffusion resistance／（Ω·cm²）	Diffusion coefficient／（cm²·S^－1）
E-0	5th	9	25	37	2.8×10^－9
?	50th	13	28	48.5	2.3×10^－9
E-1	5th	4	28	32.7	2.6×10^－9
?	50th	5	24	44.7	2.5×10^－9
E-2	5th	5	7	23.4	3.3×10^－9
?	50th	3	8	24.6	3.2×10^－9
E-3	5th	4	23	54.6	2.5×10^－9
?	50th	4.8	28	37.9	2.4×10^－9
CE	5th	8	143	299.2	1.7×10^－9
?	30th	10	150	304.6	1.5×10^－9

Fig.5 The scanning electron micrographs of cycled lithium anodes in NCM622／Li full cells with E-0（A），E-1（B），E-2（C），E-3（D）and CE（E）electrolytes

Fig.6 XPS spectra of cycled lithium anodes in NCM622／Li full cells with E-2（A－D），E-3（E－H）and CE（I－L）electrolytes

Fig.7 S2p XPS spectra on the surface of cycled lithium anode in NCM622／Li full cells with E-2 and E-3 electrolytes

References 26

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Electrochemical Performance of Lithiophilic Electrolyte in LiNi_0.6Mn_0.2Co_0.2O₂/Li Rechargeable Lithium Metal Battery

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