<p>Metal organic frameworks (MOFs) hold
great promise as high-energy anode materials for next-generation lithium ion
batteries (LIBs) due to their tuneable pore structure and abundant reaction
sites. However, since the pore structure of crystalline MOFs tends to collapse
during lithium ion insertion and extraction, it has been a challenge to develop
crystalline MOF-based anodes for high performance lithium ion batteries. Here
we report a breakthrough in developing the high-performance MOF anodes. In
detail, we have developed the first MOF glass anode, i.e., melt-quenched
Cobalt-ZIF-62 glass anode with exceptional electrochemical performances. Compared
with its crystalline counterpart, the Co-ZIF-62 glass anode exhibits
significantly higher lithium storage capacity (306 mAh g<sup>-1</sup> after
1000 cycles at the current density of 2 A g<sup>-1</sup>), outstanding cycling
stability and superior rate performance. Amazingly, the Li-ion storage capacity
of the MOF glass anode continuously rises with increasing the number of
charge-discharge cycles and even <i>tripled</i>
after 1000 cycles. We revealed the possible origin of the unusual
cycling-enhanced performances of the MOF glass anode. These superior
performances make MOF glasses ideal candidates for anode materials for LIBs. </p>