Solid electrolyte-electrode interface based on buffer therapy in solid-state lithium batteries

In the past few years,the all-solid lithium battery has attracted worldwide attentions,the ionic conductivity of some all-solid lithium-ion batteries has reached 10^(-3)-10^(-2) S/cm,indicating that the transport of lithium ions in solid electrolytes is no longer a major problem.However,some interface issues become research hotspots.Examples of these interfacial issues include the electrochemical decomposition reaction at the electrode-electrolyte interface;the low effective contact area between the solid electrolyte and the electrode etc.In order to solve the issues,researchers have pursued many different approaches.The addition of a buffer layer between the electrode and the solid electrolyte has been at the center of this endeavor.In this review paper,we provide a systematic summarization of the problems on the electrode-solid electrolyte interface and detailed reflection on the latest works of buffer-based therapies,and the review will end with a personal perspective on the improvement of buffer-based therapies.

Effect of metal catalyst on the mechanism of hydrogen spillover in three-dimensional covalent-organic frameworks

Hydrogen spillover mechanism of metal-supported covalent-organic frameworks COF-105 is investigated by means of the density functional theory, and the effects of metal catalysts M_4（Pt_4, Pd_4, and Ni_4） on the whole spillover process are systematically analyzed. These three metal catalysts exhibit several similar phenomena：（i） they prefer to deposit on the tetra（_4-dihydroxyborylphenyl） silane（TBPS） cluster with surface-contacted configuration;（ii） only the H atoms at the bridge site can migrate to 2,3,6,7,10,11-hexahydroxy triphenylene（HHTP） and TBPS surfaces, and the migration process is an endothermic reaction and not stable;（iii） the introduction of M_4 catalyst can greatly reduce the diffusion energy barrier of H atoms, which makes it easier for the H atoms to diffuse on the substrate surface. Differently, all of the H2 molecules spontaneously dissociate into H atoms onto Pt_4 and Pd_4clusters. However, the adsorbed H2 molecules on Ni_4 cluster show two types of adsorption states： one activated state with stretched H–H bond length of 0.88 ？A via the Kubas interaction and five dissociated states with separated hydrogen atoms. Among all the M_4 catalysts, the orders of the binding energy of M_4 deposited on the substrate and average chemisorption energy per H2 molecule are Pt_4〉Ni_4〉Pd_4. On the contrary, the orders of the migration and diffusion barriers of H atoms are Pt_4

Dissolution characteristics of black aluminum dross in Na_(3)AIF_(6)-AIF_(3)-Al_(2)O_(3)molten salt system

The dissolution performance of black aluminum dross(BAD)in cryolite electrolyte is key to its recovery by molten salt electrolysis.The stable operation of the electrolyzer depends mainly on the rapid dissolution of BAD in Na_(3)AlF_(6)-AlF_(3)-Al_(2)O_(3)electrolyte system.In this paper,the dissolution performance and behavior of BAD and its main components in the cryolite system were studied,and the saturation solubility of aluminum nitride in this system was determined.The dissolution performance of BAD in cryolite electrolyte before and after denitration was compared,and the effects of temperature,cryolite ratio,and the doping ratio of BAD and alumina on the dissolution rate were investigated.The obtained results showed that aluminum nitride was the main factor affecting the dissolution performance of BAD in the electrolyte.Aluminum nitride was partly converted toα-Al_(2)O_(3)after addition to the electrolyte,and the convertedα-Al_(2)O_(3)was partially dissolved in the cryolite electrolyte,while the remaining precipitated and accumulated at the bottom with aluminum nitride.Aluminum nitride was almost insoluble in the cryolite electrolyte,with 0.0022%solubility.A higher proportion ofα-Al_(2)O_(3)in BAD was negatively influenced its solubility in the cryolite electrolyte.The dissolution rate of BAD in cryolite electrolytes was effectively improved by mixing BAD withγ-Al_(2)O_(3).

Dual impact of superior SEI and separator wettability to inhibit lithium dendrite growth

Lithium metal battery(LMB)is regarded as the most potential energy storage system.However,unfortunately,its large-scale commercial development is hindered due to the uncontrollable dendrite growth problem on its Li-metal anode.The utilization of electrolyte additives is one of the promising strategies to solve the problem mentioned above.An electrolyte additive based on heptafluorobutyric anhydride(HFA)is used to solve the dendrite problem by forming robust inorganic-rich solid electrolyte interphase(SEI)and enhancing the separator wettability.

Synthesis and performances of poly(butylene-succinate) with enhanced viscosity and crystallization rate via introducing a small amount of diacetylene groups

A cross-linkable comonomer containing a diacetylene group,named dimethyl 4,4＇-（buta-l,3-diyne-l,4-diyl）dibenzoate（DA） was synthesized and copolymerized with dimethyl succinate and 1,4-butanediol to prepare a series of slightly cross-linked PBS copolyesters（PBDASx）.The chemical structure,crystallization and Theological behaviours of PBDASx were well investigated.Compared to neat PBS,PBDASx showed the greatly increased crystallization rate because of the promoting nucleation of the cross-linking domains,and the XRD results indicated that it had no influence on crystallization structure of PBS.The rheological behaviours indicate that PBDASx possessed higher viscosity than neat PBS even at high shear rate and temperature.PBDAS0.3 exhibited better comprehensive properties than neat PBS,which will widen applications of PBS.