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论文类型：期刊论文

发表时间：2018-12-19

发表刊物：ACS APPLIED MATERIALS & INTERFACES

收录刊物：SCIE、PubMed

卷号：10

期号：50

页面范围：43946-43952

ISSN号：1944-8244

关键字：lithium ion capacitor; coal tar pitch; porous carbon; MnO; three-electrode test

摘要：A lithium ion capacitor (LIC) is a hybrid energy storage device that combines the energy storage mechanism of lithium ion batteries and supercapacitors and presents their complementary features. However, imbalances of the capacity and kinetics between cathode and anode still remain challenges. Herein, to address the issue of low capacity in the cathode, we constructed a morning glory like porous material crimped from an opening sandwich structure consisting of a hard carbon inner layer and soft carbon outer layer, by coating graphene oxide containing flaky phenolic resin with coal tar pitch followed by carbonization and activation. Both the hard@soft carbon integrated design and the reduced graphene oxide network cocontributed to a favorable electrical conductivity and a developed microporosity. To deal with the sluggish kinetics limitation of the anode, a structure-optimized MnO@C electrode prepared by pore creation of CO2 from an MnCO3@polydopamine precursor was chosen due to its excellent rate performance. The LIC with this configuration can deliver a maximum energy density of 117.6 Wh kg(-1) and an favorable capacity retention of 76% after 3000 cycles at 2050 W kg(-1). Furthermore, the energy density of 27.8 Wh kg(-1) can still be delivered even at a high power density of 10250 W kg(-1). In general, this well-designed hybrid capacitor has a potential to make up the gap between lithium ion batteries and supercapacitors.