A Stretchable Graphitic Carbon/Si Anode Enabled by Conformal Coating of a Self-Healing Elastic Polymer

摘要

Stretchable electronics have recently received intense attention due to their wide applications in various areas where devices must maintain intimate contact with curvilinear interfaces or undergo large deformation. Lithium-ion batteries are the dominant power source for portable electronics and represent one of the most promising energy-storage systems for these stretchable electronic devices. Two of the main challenges impeding the development of stretchable lithium-ion battery systems, however, are the limited stretchability and low specifi c energy. Recently, much effort has been devoted toward realizing the stretchability of battery systems. Several strategies have previously been successfully developed to achieve stretchable battery systems at the device level with stiff battery islands and stretchable interconnects (e.g., origami batteries [3] and serpentine interconnects [4]) and at the battery level through the use of buckled active materials on a prestrained substrate. For the systems with device-level stretchability, the stability under stretching is still limited due to the rigidity of batteries. Worse still, the energy density of the overall battery systems is signifi cantly reduced due to the large spacing between the small isolated battery islands. To achieve higher energy densities, the development of intrinsically stretchable electrodes is of key importance. Therefore, there is still an urgent need to explore electrodes with appreciable mechanical durability under strain for use in stretchable lithium-ion batteries.