Weakly solvated EC-free linear alkyl carbonate electrolytes for Ni-rich cathode in rechargeable lithium battery
Guohuang Kang,
Geng Zhong,
Jiabin Ma,
Rui Yin,
Kangning Cai,
Tianqi Jia,
Xiaolong Ren,
Kuang Yu,
Peiwu Qin,
Zhen Chen,
Feiyu Kang,
Yidan Cao
Affiliations
Guohuang Kang
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Geng Zhong
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Jiabin Ma
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Rui Yin
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Kangning Cai
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Tianqi Jia
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Xiaolong Ren
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Kuang Yu
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Peiwu Qin
Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Institute of Biopharmaceutical and Health Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Zhen Chen
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
Feiyu Kang
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Corresponding author
Yidan Cao
Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Corresponding author
Summary: Ethylene carbonate (EC) in the electrolyte is not stable in cells operated at high voltage (≥4.4V) or with Li metal anode, which greatly reduce the energy density and lifetime of the rechargeable lithium battery. Herein, an EC-free linear alkyl carbonate-based electrolyte is developed, which enables the high-voltage (≥4.4V) and low-temperature (−30°C) application of Ni-rich cathode (LiNi0.8Mn0.1Co0.1O2, NCM811). The EC-free system, consisting of LiPF6 and LiNO3 in ternary linear alkyl carbonates, possesses low viscosity, weakly solvated structure, and high interfacial stability with both the Ni-rich cathode and the Li metal anode to avoid continuous electrode/electrolyte side reactions and metal dissolution from the cathode. As a result, the Li||NCM811 cell delivers remarkable capacity retention of 93 ± 0.5% at the voltage of 4.4V and 88 ± 0.6% at 4.5V over 100 cycles. This study provides very encouraging perspective to develop EC-free carbonate-based electrolyte for high-voltage and low-temperature application in high-energy-density rechargeable lithium batteries.
