Gu Minsu, Song Woo-Jin, Hong Jaehyung, Kim Sung Youb, Shin Tae Joo, Kotov Nicholas A, Park Soojin, Kim Byeong-Su
Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea.
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Sci Adv. 2019 Jul 26;5(7):eaaw1879. doi: 10.1126/sciadv.aaw1879. eCollection 2019 Jul.
Stretchable conductors are essential components in next-generation deformable and wearable electronic devices. The ability of stretchable conductors to achieve sufficient electrical conductivity, however, remains limited under high strain, which is particularly detrimental for charge storage devices. In this study, we present stretchable conductors made from multiple layers of gradient assembled polyurethane (GAP) comprising gold nanoparticles capable of self-assembly under strain. Stratified layering affords control over the composite internal architecture at multiple scales, leading to metallic conductivity in both the lateral and transversal directions under strains of as high as 300%. The unique combination of the electrical and mechanical properties of GAP electrodes enables the development of a stretchable lithium-ion battery with a charge-discharge rate capability of 100 mAh g at a current density of 0.5 A g and remarkable cycle retention of 96% after 1000 cycles. The hierarchical GAP nanocomposites afford rapid fabrication of advanced charge storage devices.
可拉伸导体是下一代可变形和可穿戴电子设备的关键组件。然而，可拉伸导体在高应变下实现足够电导率的能力仍然有限，这对电荷存储设备尤为不利。在本研究中，我们展示了由多层梯度组装聚氨酯（GAP）制成的可拉伸导体，其包含能够在应变下自组装的金纳米颗粒。分层提供了在多个尺度上对复合材料内部结构的控制，导致在高达300%的应变下横向和纵向均具有金属导电性。GAP电极独特的电学和力学性能组合使得能够开发出一种可拉伸锂离子电池，在0.5 A g的电流密度下充放电速率能力为100 mAh g，并且在1000次循环后具有96%的显著循环保持率。分级GAP纳米复合材料能够快速制造先进的电荷存储设备。
