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Solid electrolyte, preparation method thereof, and lithium secondary solid state battery

A technology of solid electrolyte and lithium salt, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of high cost and complicated preparation methods, and achieve high production efficiency, simple preparation process, and improved cycle. Effect

Active Publication Date: 2021-06-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method is complicated and the cost is high

Method used

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  • Solid electrolyte, preparation method thereof, and lithium secondary solid state battery
  • Solid electrolyte, preparation method thereof, and lithium secondary solid state battery
  • Solid electrolyte, preparation method thereof, and lithium secondary solid state battery

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preparation example Construction

[0050] The preparation method of the solid electrolyte of the present invention comprises the following steps:

[0051] a, mixing the polymer substrate, lithium salt and additives to obtain a slurry;

[0052] b. The slurry is formed into a film, and then dried to obtain a solid electrolyte;

[0053] In one embodiment, step a can specifically adopt the following method:

[0054] (1) Select polymer substrates, additives, and select a certain quality of solvents, including but not limited to NMP, DMF, etc., calculated by mass ratio, controlled at 60% to 85% of the total amount of slurry;

[0055] (2) adding the polymer substrate into the solvent, and stirring at room temperature for 1 to 2 hours to form a stable and uniform transparent colloid;

[0056] (3) Ultrasonic disperse the additive in a solvent whose total mass of the slurry is 10% for 10 minutes to 1 hour.

[0057] (4) Add the supersonicated additive and lithium salt directly to the glue solution prepared in step (2),...

Embodiment 1

[0064] Synthesis of Ta-doped β-LiAlSi 2 o 6 , the synthesis steps are as follows:

[0065] (1) LiOH·H with a mass percentage of 28.7% 2 O, 65.7% montmorillonite, 5.6% tantalum oxide were stirred in 20ml (when the montmorillonite was 7.1g) in isopropanol for 24 hours and dried.

[0066] (2) Grind the lumps dried in step (1) into powder, place them evenly in a crucible, and burn them in air at 900° C. for 9 hours with a heating rate of 5° C. / min.

[0067] (3) The powder sample completed by burning paper in step (2) was ball milled 30 times at a speed of 800r / min, each time being 5min, to obtain β-LiAlSi doped with Ta 2 o 6 ,spare.

[0068] The Ta-doped β-LiAlSi 2 o 6 See the XRD pattern of figure 1 . figure 1 Among them, MMT is the XRD pattern of montmorillonite. From figure 1 It can be seen that the peaks at 23.7° and 25.48° are Ta-doped β-LiAlSi 2 o 6 The two most obvious characteristic peaks of XRD show that the present invention has successfully prepared Ta-dope...

Embodiment 2

[0096] Referring to the preparation method of Example 1, the composition of the solid electrolyte is changed, and the solid electrolyte is composed of the following components in mass percentage: 65% of the polymer substrate; 25% of the lithium salt; 10% of the additive; wherein, the polymer substrate is Polyvinylidene fluoride (PVDF), lithium salt is LiTFIS, additive is β-LiAlSi doped with Ta 2 o 6 .

[0097] Using this solid electrolyte to form a battery, the first charge and discharge capacity is 150mAh / g at a rate of 0.1C. According to the picture of the rate performance, the capacity is also close to 150mAh / g at 35 cycles, and the Coulombic efficiency is close to 100%; at a rate of 0.5C , the first cycle capacity is 100mAh / g, but it will quickly rise to 130mAh / g after 2-3 cycles, the capacity is close to 135mAh / g at 40 cycles, and the capacity is still 110mAh / g after 600 cycles.

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Abstract

The invention relates to a solid electrolyte, a preparation method thereof and a lithium secondary solid state battery, belonging to the technical field of secondary batteries. The technical problem solved by the invention is to provide a low-cost solid electrolyte. The solid electrolyte includes a polymer substrate, a lithium salt and an additive, wherein the additive is Ta-doped β-LiAlSi 2 o 6 . The use of new inorganic solid electrolyte additives improves the ionic conductivity of the solid electrolyte, and at the same time inhibits the growth of lithium dendrites, increases the energy density of the battery, and ultimately improves the cycle and rate performance of the battery. The solid electrolyte also has excellent ionic conductivity, high ion transfer number, and good cycle performance and rate performance at room temperature. Moreover, the preparation process is simple, the solid electrolyte slurry can be well mixed in a short time, the production efficiency is high, and the production cost is low.

Description

technical field [0001] The invention relates to a solid electrolyte, a preparation method thereof and a lithium secondary solid state battery, belonging to the technical field of secondary batteries. Background technique [0002] With the continuous development of new energy electric vehicles and portable electronic devices, lithium-ion batteries have become the first choice for commercial batteries, but the energy density of traditional liquid lithium-ion batteries is low, and the energy density of liquid lithium iron phosphate secondary batteries is only 150Wh / kg, it is difficult to meet the needs of new energy electric vehicles and portable electronic devices for high energy density secondary batteries. At the same time, the difficulty in ensuring the safety of liquid lithium-ion batteries is another important factor restricting the development of the new energy industry. Therefore, finding a higher energy density and safer secondary battery system is the key to the deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/052H01M10/42
CPCH01M10/052H01M10/056H01M10/058H01M10/4235H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 吕维强孙庆伟张星意
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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