A novel strategy to construct high performance lithium-ion cells using one dimensional electrospun nanofibers, electrodes and separators.
We successfully demonstrated the performance of novel, one-dimensional electrospun nanofibers as cathode, anode and separator-cum-electrolyte in full-cell Li-ion configuration. The cathode, LiMn2O4 delivered excellent cycle life over 800 cycles at current density of 150 mA g(-1) with capacity retention of ~93% in half-cell assembly (Li/LiMn2O4). Under the same current rate, the anode, anatase phase TiO2, rendered ~77% initial reversible capacity after 500 cycles in half-cell configuration (Li/TiO2). Gelled electrospun PVdF-HFP exhibits liquid-like conductivity of ~3.2 mS cm(-1) at ambient temperature conditions (30 °C). For the first time, a full-cell is fabricated with enitrely electrospun one-dimensional materials by adjusting the mass loading of cathode with respect to anode in the presence of gelled PVdF-HFP membrane as a separator-cum-electrolyte. Full-cell LiMn2O4|gelled PVdF-HFP|TiO2 delivered good capacity characteristics and excellent cyclability with an operating potential of ∼2.2 V at a current density of 150 mA g(-1). Under harsh conditions (16 C rate), the full-cell showed a very stable capacity behavior with good calendar life. This clearly showed that electrospinning is an efficient technique for producing high performance electro-active materials to fabricate a high performance Li-ion assembly for commercialization without compromising the eco-friendliness and raw material cost.
Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, Singapore 637553, Singapore. aravind_van@yahoo.com.
Vanchiappan
V
Aravindan
Jayaraman
J
Sundaramurthy
Palaniswamy Suresh
PS
Kumar
Nageswaran
N
Shubha
Wong Chui
WC
Ling
Seeram
S
Ramakrishna
Srinivasan
S
Madhavi
D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D013696:Temperature; D014025:Titanium / Q000737:chemistry
D004573:Electrolytes; D007477:Ions; D010087:Oxides; D011108:Polymers; C488552:lithium manganese oxide; C009495:titanium dioxide; D008345:Manganese; D008094:Lithium; D014025:Titanium