Intercalation-pseudocapacitance hybrid anode for high rate and energy lithium-ion capacitors

Authors：Liu, Chang; Khosrozadeh, Ali; Ren, Qing-Qing; Yan, Ling-Hui; Goh, Kokswee; Li, Shi-Han; Liu, Jian^*; Zhao, Lei^*; Gu, Da-Ming; Wang, Zhen-Bo^*

Source：Journal of Energy Chemistry, 2021, 55: 459-467.

DOI：10.1016/j.jechem.2020.07.032

• Manganese vanadate
• Graphene
• Pseudocapacity
• Hempstem-based activated carbons
• Lithium ion capacitor

Existing rechargeable batteries not only fail to meet the demand for high power applications but also cause heavy metal pollution. Li-ion capacitors (LICs), which can achieve higher charging speeds and energy densities than supercapacitors, have attracted extensive attention. Nevertheless, sluggish Li-ion diffusion of the battery-type anode results in limited rate performance of LICs. Herein, high-performance LICs using both battery and capacitor type Mn2V2O7-graphene (MVO-G) anodes and hempstem-derivated activated carbon (HSAC) cathodes with a large surface area are first reported. In addition to high pseudocapacitance, the MVO-G possesses the advantage of fast Li+ storage performance making it a suitable choice for advanced LIC anodes. Graphene is employed to enhance overall conductivity and cycling stability leading to enhanced energy storage. The MVO-G//HSAC LICs exhibit a high energy density of 148.1 Wh kg(-1) at a power density of 150 W kg(-1) and 25 Wh kg(-1) even at 15 kW kg(-1). More importantly, the MVO-G//HSAC LICs also show excellent cycling stability of 90% after 15,000 cycles, which is expected for high performance energy storage systems.

• Institution
  1; harbin inst technol