In-situ composite solid electrolyte, application thereof, all-solid-state battery and preparation method thereof
A solid-state electrolyte and all-solid-state battery technology, which is applied in the field of lithium-ion batteries, can solve the problems of unfavorable process amplification and preparation, and poor ion transmission channels.
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[0034] The present invention also provides a method for preparing the above-mentioned all-solid-state battery, comprising: S1) mixing lithium salts, additives and initiators to obtain a mixed solution; the additives are small molecular monomers containing unsaturated bonds; S2) mixing The mixed solution is in-situ polymerized and bonded in the positive electrode layer, the solid electrolyte layer and the negative electrode layer and between the layers to obtain an all-solid battery; the solid electrolyte layer includes an inorganic solid electrolyte and a binder.
[0035] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.
[0036] Mix the lithium salt, the additive and the initiator, preferably first mix the lithium salt and the additive, and then add the initiator to obtain a mixed solution; the mixing is preferably carried out under the protection of an inert gas; the inert gas is a technology in the art ...
Embodiment 1
[0042] Under an argon protective atmosphere, add 5% lithium hexafluorophosphate to vinyl sulfite, stir evenly, then add 0.5% azobisisobutyronitrile into the solution, and mix evenly to obtain a mixed solution.
[0043] The mixed solution is added to lithium cobaltate as positive pole, lithium metal as negative pole, containing Li 7 La 3 Zr 2 o 12 and polyvinylidene fluoride (mass ratio is 7 / 3) as the all-solid-state battery of the electrolyte layer, wherein the solid-state electrolyte layer accounts for 50% of the total mass of the all-solid-state battery; 10%, and then the all-solid-state battery was left at 40° C. for 4 hours to obtain an all-solid-state battery in which vinyl vinyl sulfite was polymerized and cured in situ.
[0044] The performance of the all-solid-state battery obtained by in-situ polymerization and curing of vinyl vinyl sulfite obtained in Example 1 was tested, and the results obtained are shown in Table 1.
[0045] Table 1 Test results of internal re...
Embodiment 2
[0048] Under an argon protective atmosphere, add 10% by mass fraction of lithium bistrifluoromethanesulfonimide to ethylene carbonate, stir evenly, then add 3% by mass fraction of benzoyl peroxide to the solution, mix Evenly, a mixture is obtained.
[0049] The mixed solution is added to the ternary nickel-cobalt-manganese as the positive electrode, graphite as the negative electrode, containing Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 and polyethylene oxide (mass ratio 9 / 1) as the all-solid-state battery of the electrolyte layer, wherein the solid-state electrolyte layer accounts for 20% of the total mass of the all-solid-state battery; after adding the mixed solution, the mixed solution accounts for 3% of the total battery weight, and then The all-solid-state battery was left standing at 60° C. for 5 hours to obtain an all-solid-state battery in which vinylene trithiocarbonate was polymerized and solidified in situ.
[0050] The performance of the all-solid-state battery obtained...
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