Graphene And 3D Printing Technology Effects Lithium Battery
Author: Source: Datetime: 2016-12-28 14:17:24
Kun Fu design of the battery, positive and negative, respectively, the use of LFP battery and LTO LTO, the printing process is first through the nozzle out of filaments, according to a set of procedures laid on the substrate layer by layer, and then Using freeze-drying to remove the water and curing structure, and then after heat treatment, the graphene GO into reduced graphene, and finally in the gap between the positive and negative fill in the polymer electrolyte to complete the 3D printing battery Of the production. In the electrode, the graphene oxide GO exhibits a regular arrangement due to the shearing force, which enhances the electronic conductivity, and the porous structure of the graphene oxide GO also provides a large number of attachment points for the LFO or LTO and the electrolyte.
Of course, for a printing ink for 3D, rheological properties is the most important attribute, which will directly affect the print results, GO, LFP / GO, LTO / GO system studies found that the rheological properties of the three curves are almost the same , Indicating that LFO, LTO on the rheological properties of the slurry has little effect. And the slurry has a high apparent viscosity, at a shear rate of 1 / s, the slurry viscosity of 100-1000Pa, which is conducive to the complex structure of the print and design. Storage experiments showed that the viscosity of the slurry was only slightly increased over a period of up to four weeks and the slurry remained shear thinning and the apparent viscosity remained within the range of 100-1000 Pa, The ink for 3D printing has good storage characteristics.
Of course, for a lithium-ion battery, the most important thing is the electrochemical performance. The electrochemical measurements show that the LFO / GO half-cell has a charge-discharge capacity of 168 and 164 mAh / g at a current density of 10 mA / g, which is very close to the theoretical specific capacity of 170 mAh / g. The charge / discharge capacity of the LTO / GO half-cell was 184 mAh / g and 185 mAh / g at a current density of 10 mA / g, which was even higher than the theoretical specific capacity of LTO of 175 mAh / g, which may be attributed to the reduction of graphene oxide. In the rate performance test, we found that the performance of the LTO anode is significantly lower than that of the LFP anode. This is mainly due to two reasons: first, the electronic conductivity of LTO is lower than that of LFP materials (6.1 and 31.6S / Cm), followed by LTO granules were significantly larger than LFP (200 and 50nm), which affected the diffusion of Li + and charge exchange.
The biggest advantage of 3D printing technology can be customized according to the needs of special shape of the solar power batteries, for example, in some micro-robotics, the traditional lithium-ion battery technology, can not produce micro-and special shape lithium-ion battery, and 3D printing technology does not exist Problem, you can greatly expand the application of lithium-ion battery.
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