Lithium ion batteries are playing indispensible role in our modern life full of portable electronics and in constant move. However, the advancement of lithium ion batteries has lagged way behind electronics, in spite of extensive research efforts across research venues and industries. Search for better electrode materials with both high energy and power densities as well as excellent cyclic stability must consider (1) proper chemical reaction at the interface between electrode and electrolyte: alloying, conversion reaction and intercalation, (2) crystal structure with available space to accommodate guest species such as spinel, olivine and layer structured crystals, (3) reversible phase transition, and (4) manageable volume change. In addition, the charge/discharge voltage and transport kinetics play determining roles in the energy density and power density as well as the energy storage efficiency of the resulting batteries. In this presentation, I will take a high performance Li3V2(PO4)3/C material synthesized by low-cost hydrothermal method followed with subsequent annealing treatment as an example to demonstrate the efficient storage of the high frequency pulse power generated by a triboelectric nanogenerator. Not only does the Li3V2(PO4)3/C exhibit a discharge capacity of 128 mAh g-1 at 1 C with excellent cyclic stability (capacity retention is 90% after 1000 cycles at a rate of 5 C) in Li-ion battery, but also shows outstanding energy conversion efficiency (83.4%) compared with the most popular cathodic materials: LiFePO4 (74.4%), LiCoO2 (66.1%), and LiMn2O4 (73.6%) when it was charged by high frequency and large current electricity.

Highly efficient storage of high-frequency pulse energy in Li3V2(PO4)3/C cathode Li-ion batteries

251st National Meeting (2016)

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