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A brief discussion on the application of nanotechnology in button cell battery cr1620
As a high-efficiency energy storage component, button cell battery cr1620 have been widely used in the field of consumer electronics. button cell battery cr1620 are used in everything from mobile phones to laptops. The success of button cell battery cr1620 is due to their ultra-high energy storage density. and good safety features. With the continuous development of technology, the energy density and power density of button cell battery cr1620 are also constantly improving, of which nanotechnology has made an indelible contribution. Speaking of the application of nanotechnology in button cell battery cr1620, the first thing that comes to my mind is LiFePO4. Due to its poor conductivity, LiFePO4 is prepared into nanoparticles in order to improve its conductivity, which greatly improves the electrical conductivity of LiFePO4. chemical properties. In addition, the silicon anode is also a beneficiary of nanotechnology. Nano-silicon particles can well inhibit the volume expansion of Si during the process of lithium insertion and improve the cycle performance of Si materials. Recently, Jun Lu from Argonne National Laboratory in the United States published an article in Naturenanotechnology magazine, summarizing and reviewing the application of nanotechnology in button cell battery cr1620.
Cathode material
1.LiFePO4 material
LiFePO4 material has good thermal stability and low cost, which has attracted widespread attention. However, due to the unique covalent bond structure inside the LiFePO4 material, the electronic conductivity of the LFP material is very low, thus limiting its high-rate charge and discharge performance. For this reason, LFP materials are made into nanoparticles and coated with conductive materials (such as carbon), conductive polymers, and metals. In addition, people have also found that by incorporating high-valent metal cations into nano-LFP particles using a non-stoichiometric solid solution doping method, the electronic conductivity of LFP nano-particles can be increased by 108, so that the LFP material can be charged and discharged within 3 minutes. This is particularly important for electric vehicles.
2. Inhibit the decomposition of LiMn2O4 materials
The LMO material has a three-dimensional Li+ diffusion channel, so it has a high ion diffusion coefficient. However, Mn3+ will be formed in a low SoC state. Due to the existence of the Jonh-Teller effect, the LMO structure is unstable and some Mn elements are dissolved into the electrolyte. And eventually deposited on the surface of the negative electrode, destroying the structure of the SEI film. Currently, one solution is to add some low-valent main group metal ions, such as Li, to replace part of Mn in LMO, thereby increasing the valence state of the Mn element at low SoC and reducing Mn3+. Another solution is to coat the surface of LMO material particles with a layer of oxides and fluorides with a thickness of 10-20nm, such as ZrO2, TiO2 and SiO2.
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