Nano carbon/lithium sulfide composite material and preparation method and application thereof
A technology of nano-carbon materials and composite materials, which is applied in the field of electrochemical energy and nano-material preparation, can solve the problem of not being able to meet the high-rate electrochemical cycle of high-area loading batteries, unable to realize the effective operation of high-area loading batteries, and the difficulty of batteries Realize the activation and circulation of large rate, and achieve the effect of rapid charge and discharge, electrochemical cycle stability and rate performance, and prevent electrochemical decomposition
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[0033]The preparation principle of the present invention may lie in that: the nitrogen-containing organic high molecular polymer material can be dissolved and volatilized in an organic solvent. During the dissolution process, the high molecular polymer can form a viscous gel in the organic solution, After the organic solvent is used, it can cross-link lithium sulfate and nano-carbon materials, and the bonding effect will make the active material and the conductive matrix tightly connected, and evenly load certain metal atom precursors. After the organic solvent volatilizes, the nitrogen-containing organic high molecular polymer can fix and coat the nano-carbon material, lithium sulfate and metal atom precursors. In a high-temperature reducing atmosphere, lithium sulfate nanoparticles are reduced to lithium sulfide, and the metal atom precursor is processed to form a composite material of metal single-atom catalyst supported on a nitrogen-rich, high-conductivity nanostructured c...
Embodiment 1
[0064] Commercial polyacrylamide (PAN) organic polymer, commercial lithium sulfate (Li 2 SO 4 ) was added to a certain amount of N,N-dimethylformamide (DMF) at a mass ratio of 1:1 and mixed evenly. After 12 hours of magnetic stirring, the DMF was quickly volatilized at a temperature of 120°C, and the obtained solid powder was compounded The material, after ball milling, was transferred to a corundum crucible. In a mixed atmosphere of ammonia / argon, the composite material precursor was placed in a program-controlled tube furnace for heat treatment at a heating rate of 10 °C / min, and then naturally cooled to room temperature at 600 °C for 120 min to obtain a composite material (Li 2 S@C), where the SEM image of lithium sulfide can be found in figure 1 . From figure 1 It can be seen that the lithium sulfide prepared by high-temperature conversion has a nanosheet structure.
Embodiment 2
[0066] Nitrogen doped graphene, commercial polyacrylamide (PAN) organic polymer, commercial lithium sulfate (Li 2 SO 4 ) was added to a certain amount of N,N-dimethylformamide (DMF) at a mass ratio of 1:3:9 and mixed evenly. After 12 hours of magnetic stirring, the DMF was quickly volatilized at a temperature of 120°C to obtain a solid The powder, after ball milling, was transferred to a corundum crucible. In a mixed atmosphere of ammonia / argon, the composite material precursor was placed in a program-controlled tube furnace for heat treatment at a heating rate of 5 °C / min, and then naturally cooled to room temperature at 500 °C for 300 min to obtain a composite material (Li 2 S@C), for its scanning electron micrograph, please refer to figure 2 . From figure 2 It can be seen that adding graphene to the precursor will not change the structure and morphology of the transformed lithium sulfide, which is still a sheet-like structure.
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