A scientific research team from Shanghai Fudan University has also developed a telescopic line-type lithium-ion battery. The innovation technology utilizes two directional multilayer wall carbon nanotubes / lithium oxide composite wires as the anode and cathode material of the battery pack, and No additional use of current collectors and binders. As this scientific team published in the "Apply Chemistry" magazine, the new battery can be braided into light quantization, easy to bend, elastic, safe and reliable fabric structure, and has a high energy density level.The two composite wires can be used, which can get a high reliability battery pack. The energy density reaches 27 watts / kg or 17.7 mW hours / cubic centimeter, the power density reaches 880 watts / kg or 0.56 watts / cubic centimeter, these data ratios Traditional lithium ion thin film battery reflects the increase in quantities. The wire type battery has a strong weight, and the storage capacity can retain 97% of the new product after 100 bending tests.
Thanks to the improved spring structure, the linear battery is flexible; with a tensile test of 100% of 200 intensity, the electric storage performance is only reduced by 16%. Innovative linear batteries have been developed into stretchable fabric batteries, and it is likely to be widely used in the future. The previous production of linear electrochemical supercapacitors is to wind around the two fiber electrodes, but the performance of the entire system is poor, and ultimately has not been successfully promoted to the market.
Lithium-ion battery packs can effectively increase energy density, but the previous design did not take into account the form of the wire. In addition to the problem of functional structures, the safety of lithium-ion batteries is also an important factor: the battery will form a dendritic structure when the battery is overcharged, and it is possible to penetrate the anode, causing the entire power supply system short circuit, which eventually causing a battery. Spontaneous combustion. This problem is more serious for linear battery constructs because stretching, winding, and bending during use are easier to short.
Solve security issues
This research team in Fudan University successfully solved the safety problem, developed a line-type lithium-ion battery of high energy density, and the core technology is a special structure and the material used. The anode and the cathode chamber are in a parallel position of multilayer wall carbon nanotube fibers, one of which contains lithium titanate (LTO) particles, and the other contains lithium manganate (LMO) particles. Due to parallel nanostructures and ultra-high conductive capabilities, the manufacturing process does not need to use any current collectors and binders.
During the battery charging, the lithium ion moves from a lithium manganate lattice to the electrolyte, and finally reaches the titanate lattice lattice of the anode; during the battery discharge, the direction of movement of the lithium ion is just the opposite. The application of the lithium titanate composite electrode such that the conversion between the lithium ions and the lithium ions occurred around the voltage of 1.5 volts, so the probability of the dendrimal lithium structure is small, which does not cause short-circuiting, so that the battery safety is guaranteed.
The parallel arrangement of continuous carbon nanotubes can maximize the nanoparticles and provide a valid path for charge transmission, which acts as a current collector. The two electrode wires are distributed, separated from one insulator layer and being wrapped in a heat shrink tube. In order to make the linear battery is elastic, the wrapping material can be used in elastomeric fibers like polymethiloxysiloxane, and a thin layer of colloidal electrolyte is applied. In this case, no matter whether the length is stretched to the original, or the battery capacity is lowered.
The linear battery can be produced as a long fiber, then processed into a fabric structure, and finally appears in the form of textile.
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