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Preparation method of lithium-sodium ion mixed solid electrolyte and solid-state mixed battery
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A technology of solid electrolyte and sodium ion, which is applied in the preparation of lithium-sodium ion mixed solid electrolyte and the field of solid-state hybrid battery, which can solve the problems of lack of solid electrolyte and achieve excellent electrochemical performance, rich content and low price
Active Publication Date: 2021-03-26
SHANGHAI INST OF SPACE POWER SOURCES
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Problems solved by technology
However, there are few reports on solid-state hybrid lithium-sodium-ion batteries due to the lack of solid-state electrolytes that can simultaneously conduct lithium and sodium ions.
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Embodiment 1
[0029] A method for preparing a lithium-sodium ion mixed solid state electrolyte, comprising the following steps:
[0030] Step 1, the Na superionic conductor Na 3 Zr 2 Si 2 PO 12 Powder and lithium salt LiTFSI, ionic liquid 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt (C 8 h 11 f 6 N 3 o 4 S 2 ), polystyrene mixed evenly, put into the reactor, the concentration of lithium salt in the ionic liquid is 0.5mol / L;
[0031] Step 2, put the reaction kettle into a homogeneous reactor, heat-treat at 180°C for 4 hours at a speed of 50 rpm / min;
[0032] Step 3, taking out the product in the reaction kettle and centrifuging to remove excess lithium salt and ionic liquid, and repeatedly washing with alcohol for 2 to 3 times and then drying;
[0033] Step 4: heat-treat the product obtained in step 3 at 400° C. for 2 hours to remove excess polystyrene to obtain a lithium-sodium ion mixed solid electrolyte.
[0034] Through the above method, the lithium-sodium ion...
Embodiment 2
[0038] A kind of lithium-sodium ion mixed solid electrolyte, this solid electrolyte is lithium-sodium mixed superionic conductor, chemical formula Li 1.39 Na 1.61 Zr 2 Si 2 PO 12 , can conduct lithium-sodium mixed ions, and can be used for solid-state hybrid lithium-sodium batteries.
[0039] A method for preparing a lithium-sodium ion mixed solid state electrolyte, comprising the following steps:
[0040]Step 1, the Na superionic conductor Na 3 Zr 2 Si 2 PO 12 Powder and lithium salt LiTFSI, ionic liquid 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt (C 8 h 11 f 6 N 3 o 4 S 2 ), polystyrene mixed evenly, put into the reactor, the concentration of lithium salt in the ionic liquid is 0.35mol / L;
[0041] Step 2, put the reaction kettle into a homogeneous reactor, heat-treat at 180°C for 4 hours at a speed of 50 rpm / min;
[0042] Step 3, taking out the product in the reaction kettle and centrifuging to remove excess lithium salt and ionic liquid, and...
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Abstract
The invention discloses a preparation method of a lithium-sodiumion mixed solidelectrolyte, which comprises the following steps: step 1, uniformly mixing sodium superion conductor powder with a lithium salt, an ionic liquid and polystyrene, and putting the mixture into a reaction kettle, the concentration of the lithium salt in the ionic liquid being 0.1 mol / L to 0.5 mol / L; step 2, putting the reaction kettle into a homogeneous reactor, and carrying out primary heat treatment; 3, taking out a product in the reaction kettle, and carrying out centrifugal separation, washing and drying; and 4,carrying out secondary heat treatment on the product obtained in the step 3 to obtain the lithium-sodiumion mixed solidelectrolyte. The lithium-sodium ion mixed solidelectrolyte provided by the invention can conduct lithium ions and sodium ions at the same time, has high conductivity and high reliability, can directly adopt a current commercial lithium ion battery positive electrode material, is similar to a lithium-sodium ion transmission mechanism, and can be rapidly applied. Therefore, the battery with practical value is obtained, and the battery has excellent electrochemical performanceand low price.
Description
technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a preparation method of a lithium-sodium ion mixed solid-state electrolyte and a solid-state hybrid battery. Background technique [0002] The development of electric vehicles, large-scale energy storage and micro-devices requires continuous improvement of the energy density, power density, operating temperature range and safety of existing secondary batteries, and solid-state lithium batteries are the most potential electrochemical energy storage devices. , has received extensive attention in recent years. Solid-state electrolyte materials and solid-state lithium batteries have been extensively studied. The relatively scarce lithium resources in nature greatly limit the large-scale development of solid-state lithium-ion batteries (Kim, J.J., Yoon, K., Park, I., etal. Small Methods 2017, 1, 1700219.), with With the large-scale preparation of lithium batteries, the...
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