Inspired by the structure of biological spine, Guoyu Qian and others at Columbia University developed a flexible lithium-ion battery that not only ensures good flexibility, but also maintains the advantage of high volumetric energy density.

　　Columbia University Guoyu Qian and others were inspired by the structure of biological spine and developed a flexible lithium-ion battery that not only ensures good flexibility, but also maintains the advantage of high volumetric energy density.

　　The basic structure of a flexible battery can be divided into a main trunk and branches connected to the main trunk. These branches will wrap around the main trunk to form a structure similar to the vertebrae of an animal. The main trunk is connected to an external circuit. This structure not only ensures the battery has good flexibility, but also greatly improves the energy density of the flexible battery. When LiCoO2/graphite is used as the active material, the battery volume specific energy of this structure can reach 242Wh/L.

　　In the electrochemical performance test, the cycle performance of the battery of this structure is not affected, whether it is bending (bending radius 20mm, 10000 times) or twisting (torsion 90 degrees 1000 times), the cycle performance of the battery of this structure is not affected, and the cycle performance is 100 times at a rate of 0.2C. , The capacity retention rate can reach 94.3%, and the coulombic efficiency can reach 99.9%.

　　Comment: To be honest, although wearable devices such as Bluetooth headsets have become more common, "smart clothing" with flexible batteries as the core is still far away. A friend told me during a chat that the current smart coat, not to mention cost control, is also very low-reliability, especially the damage to the battery due to folding and cleaning is very large, and therefore, this friend is trying to transfer the battery to the belt , The current sample weighs 7 catties, which is temporarily unavailable. Therefore, as a consumer, don't expect too much, and buy traditional clothes honestly.