Construction of a 12-Phosphomolybdate-based Coordination Polymer@Crumpled Graphene Balls Composite as Anode for Lithium Batteries.

To address the poor electronic conductivity and easily dissolved in electrolyte of polyoxometalates (POMs), and considering the high electrical conductivity and configuration advantages of crumpled graphene balls (CGBs), herein, a series of POM-based coordination polymers [Cu(pyttz) ₂ ]PMo ₁₂ @CGB (n, n=1, 2, 3) were successfully synthesized, and electrochemical lithium storage performance and lithium ion diffusion kinetics were comprehensively investigated. Galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) study confirm that [Cu(pyttz) ₂ ]PMo ₁₂ @CGB (n, n=1, 2, 3) integrates the advantage of high electronic conductivity of CGB and excellent Li ⁺ migration kinetics of POMs, which greatly ameliorates the electrochemical performances of POMs, among [Cu(pyttz) ₂ ]PMo ₁₂ @CGB (2) exhibits an excellent reversible specific capacity of around 941.4 mA h g ^-1 at 0.1 A g ^-1 after 150 cycles and admirable rate performance. This work will promote the development of POMCP anodes, thus fulfilling their potential in high-performance LIBs.
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