Another breakthrough in solid-state battery -Lithium - Ion Battery Equipment

Another breakthrough in solid-state battery research -Lithium - Ion Battery Equipment

【Solid-state battery】Important progress has been made in the research on polymer solid-state sodium batteries of the Institute of Physics, Chinese Academy of Sciences

The Clean Energy Experiment of Institute of Physics, Chinese Academy of Sciences/Beijing National Research Center for Condensed Matter Physics proposes a method to remove residual free solvent molecules in SPE in situ by chemical reaction. The key to this method lies in the selection of suitable solvent, salt and additive combination through control, and cleverly designing a two-step chemical reaction process of salt-solvent molecule-additive during the solvent removal process, so as to realize the final conversion of the residual solvent into a stable additive surface coating. , and then achieve the purpose of completely removing the residual solvent. The SPE prepared by this process effectively reduces the interfacial side reactions of solid-state batteries, and greatly improves the coulombic efficiency, cycle stability and rate performance of the battery.(Lithium - Ion Battery Equipment)

The NVP|SPE|Na, NVP|FSI-Al2O3-AQ|Na solid-state batteries were assembled using sodium vanadium phosphate (NVP) and sodium metal (Na) as the positive and negative electrodes, respectively. The first-week reversible specific capacity was 110 mAh/g, and the Coulombic efficiency was was 93.8%, reaching the level when liquid electrolyte was used. During 2000 cycles of NVP|FSI-Al2O3-AQ|Na solid-state battery at 1C rate, the coulombic efficiency remained at ~100%, the capacity retention rate after 2000 cycles was 92.8%, and the average weekly capacity decay rate was only 0.0036%. The symmetric battery for sodium metal can be cycled stably for 800 h at a current density of 100 μA/cm2. The electrochemical impedance spectra also remained relatively stable during battery cycling. The cycle stability of the solid-state sodium battery assembled with the SPE designed in this work is the best polymer solid-state sodium battery reported so far.

[Solid-state battery] MIT team publishes method for new lithium-rich ceramic electrolyte

MIT researchers have proposed a new pulsed laser deposition technique that uses less heat to create thinner lithium-ion electrolytes to improve fast-charging performance and boost operating voltages in solid-state lithium-ion batteries. The key to this new technique lies in the preparation of alternating layers of electrolyte lithium garnet components and lithium nitride layers (Li3N). First, the layers are built into layered crystals using a pulsed laser deposition process at about 300 degrees Celsius (572 degrees Fahrenheit). They were then heated to 660°C and slowly cooled (annealed). During the annealing process, nearly all the nitrogen atoms are burned into the atmosphere, and the lithium atoms from the pristine nitride layer are fused into the lithium garnet, forming a lithium-rich ceramic film. The extra lithium content in the garnet film allows the material to maintain the cubic structure required for the rapid passage of positively charged lithium ions (cations) through the electrolyte. The paper was published in the journal Nature (a sub-journal of Energy) by a team led by MIT associate professor Jennifer L.M. Rupp.

【TSLA】TSLA and partners discover new lithium battery technology route

The TSLA battery research group and partners have published a new research report, saying that a new lithium battery technology with higher energy density and more stability than solid-state batteries has been discovered, which may change the development route of the next stage of power lithium battery technology. Previously, many battery research institutions have regarded solid-state batteries as the first choice for the next stage, and energy density is also the most important technical parameter for power lithium batteries.

The full name of the technical report is: LiDFOB/LiBF4 liquid electrolyte anode-free lithium metal battery research report. The core information shows that many previous studies are not optimistic about the next stage of lithium metal batteries. It is believed that the traditional liquid electrolyte used in the battery must be replaced by a solid electrolyte in order to maintain the long-term stable cycle life and high energy density. However, in the latest experiments, it was found that the anode-free lithium metal battery using LiDFOB/LiBF4 liquid electrolyte can still retain 80% of the battery capacity and high stability after 90 charge-discharge cycles. inferior to solid-state batteries.



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