Prof. Tianquan Lin[Shanghai Jiao Tong University

Title:   Design and fabrication of high energy density electrochemical capacitors

     高能量密度混合型化学电容器的设计制备

Time:  15:00 -15:45 am, Thursday, May 27, 2021

Place: Conference room 410, HPSTAR (Shanghai)

            Tencent Meeting ID: 860 602 742

Host: Xujie Lü

Abstract: The new generation of high-end equipment puts forward the requirements of high energy, high power, and high safety for electrochemical energy storage devices. Electric double layer capacitor (supercapacitors) can provide high electrical power, but they do not have sufficient energy density to directly compete with batteries. We found that a nitrogen-doped mesoporous few-layer carbon and black TiO2-x has high capacitance and can be bipolarly charged or discharged at a fast, carbon-like speed. The improvement mostly stems from robust redox reactions at defects without affecting its electric conductivity. These as-prepared electrochemical cells with ceramic membrane offer power densities and lifetimes similar to those of carbon-based supercapacitors and can store a specific energy of 100 Wh/kg.

以电磁弹射、定向能武器为代表的新一代高端装备对电化学储能器件提出了兼具高能量、高功率和高安全的要求。目前，以锂电池和超级电容器为代表的两大类化学储能器件，受限于储能机理，难以同时满足这些要求。本报告主要针对化学储能中高能量与高功率难以兼顾的科学难题，提出“体相储能+表层储能”一体化的机理，运用高容量高导电的氮掺杂介孔少层碳、高导电黑色二氧化钛、纳孔单晶钛铌氧化物、耐高温高离子导通陶瓷隔膜、高导电集流体等关键材料，设计了低内阻器件结构，并与南通江海电容器公司合作研发出高能量混合型电容器，经第三方检测，锂离子电容器的能量密度达到100Wh/kg、功率密度达到10kW/kg、循环寿命达到20,000次（100%DOD），已应用于智能电网、飞行器等领域。