Development of new Bionic flexible lithium-ion batteries at Columbia University

Inspired by the biological spine structure, Columbia University GuoyuQian and others have developed a flexible lithium-ion battery that maintains the flexibility of high volumetric energy density while ensuring good flexibility.

The basic structure of a flexible battery can be divided into a trunk and branches connected to the trunk. These branches will be wound around the trunk and eventually form a structure similar to the animal spine, which is connected by the trunk to the external circuit. Such a structure not only ensures that the battery has good flexibility, but also greatly improves the energy density of the flexible battery. When LiCoO2/graphite is used as an active substance, the battery volume of this structure can reach 242 Wh/L.

In the electrochemical performance test, whether it is bending (bending radius 20mm, 10,000 times) or twisting (twisting 90 degrees, 1,000 times), the cyclic performance of the battery of this structure is not affected, and it circulates at 0.2 C times 100 times. The capacity retention rate can reach 94.3 %, Coulomb efficiency reached 99.9 %.

Comments: Tell the truth, although wearable devices such as Bluetooth headsets are already common, "smart clothing" with flexible batteries as the core is still far away. A friend told me during the chat that the current smart coat, cost control, reliability is also very low, especially the folding and cleaning damage to the battery is very large, so this friend is trying to transfer the battery to the belt the current sample weighs 7 kg and is temporarily unusable. So, as a consumer, don't expect too much, or honestly buy traditional clothes.

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