TY - JOUR
T1 - Improved Cycling of Li||NMC811 Batteries under Practical Conditions by a Localized High-Concentration Electrolyte
AU - Guo, Feng
AU - Chen, Xi
AU - Hou, Yuhan
AU - Wei, Wenshuo
AU - Wang, Zhicheng
AU - Yu, Hao
AU - Xu, Jingjing
N1 - Funding Information:
F.G. and X.C. contributed equally to this work. This work was supported by the Natural Science Foundation of Jiangsu Province (BK20200252), the Key Program Special Fund in XJTLU (KSF‐E‐36), the Research Development Fund in XJTLU (RDF‐18‐01‐27), and the National Natural Science Foundation of China (grant number: 22179142).
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/1/23
Y1 - 2023/1/23
N2 - Li||NMC811 battery, with lithium-metal (high specific capacity and low redox potential) as anode and LiNi0.8Co0.1Mn0.1O2 (NMC811) as cathode, has been widely accepted to be a good candidate as one of the high-energy-density batteries. However, its cyclability needs improvement to fulfill the requirement for its future commercial use, especially under practical conditions. Electrolyte plays a key role in improving the cycling performance of Li||NMC811 batteries, where a high voltage/electrochemical window and good stability with the electrodes of the electrolyte are required. Herein, a localized high-concentration electrolyte with an additive of lithium difluoro(oxalate)borate (LiDFOB) is reported that improves the cycling performance of Li||NMC811 cells under crucial conditions with Li foil thickness of 50 µm, cathode areal loading of 4 mAh cm−2, the areal capacity ratio between the negative and positive electrodes (N/P ratio) of 2.6 and the electrolyte/cell capacity ratio (E/C ratio) of 3.0 g (Ah)−1. These cells can maintain 80% of the capacity after 195 cycles.
AB - Li||NMC811 battery, with lithium-metal (high specific capacity and low redox potential) as anode and LiNi0.8Co0.1Mn0.1O2 (NMC811) as cathode, has been widely accepted to be a good candidate as one of the high-energy-density batteries. However, its cyclability needs improvement to fulfill the requirement for its future commercial use, especially under practical conditions. Electrolyte plays a key role in improving the cycling performance of Li||NMC811 batteries, where a high voltage/electrochemical window and good stability with the electrodes of the electrolyte are required. Herein, a localized high-concentration electrolyte with an additive of lithium difluoro(oxalate)borate (LiDFOB) is reported that improves the cycling performance of Li||NMC811 cells under crucial conditions with Li foil thickness of 50 µm, cathode areal loading of 4 mAh cm−2, the areal capacity ratio between the negative and positive electrodes (N/P ratio) of 2.6 and the electrolyte/cell capacity ratio (E/C ratio) of 3.0 g (Ah)−1. These cells can maintain 80% of the capacity after 195 cycles.
KW - high energy density
KW - lithium metal anodes
KW - lithium-metal batteries
KW - localized high-concentration electrolytes
KW - practical condition
UR - http://www.scopus.com/inward/record.url?scp=85147004292&partnerID=8YFLogxK
U2 - 10.1002/smll.202207290
DO - 10.1002/smll.202207290
M3 - Article
C2 - 36670341
AN - SCOPUS:85147004292
SN - 1613-6810
VL - 19
JO - Small
JF - Small
IS - 16
M1 - 2207290
ER -