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Lithium sulfide system solid electrolyte material containing silver bromide and silver chloride and preparation method thereof
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A solid electrolyte, silver chloride technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of high material content, reduced lithium sulfide component content, unsatisfactory ionic conductivity of solid electrolytes, etc. Conductivity, the effect of improving ion conductivity
Active Publication Date: 2017-05-31
GUILIN ELECTRICAL EQUIP SCI RES INST
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According to the analysis of the applicant, the reasons for the unsatisfactory improvement of the ionconductivity of the solid electrolyte obtained by the above-mentioned invention patent are mainly: (1) the added substance (such as iodide or sulfide, etc.) is a stable hexagonal crystal or orthorhombic crystal, It cannot react with surrounding substances, and cannot introduce more atomic vacancies into the system, and cannot provide more diffusion channels for the diffusion of lithium ions; (2) The content of added substances is too high, on the one hand, it reduces the capacity of lithium ion carriers. On the other hand, high-content, stable additives not only did not increase the lithium ion diffusion channels in the solid electrolyte, but hindered the diffusion of lithium ions
At present, there is no report about adding silver bromide and silver chloride to the lithium sulfide solid electrolyte material to improve its ion conductivity.
Method used
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[0028] By mass percent, take by weighing 40% lithium sulfide and 60% phosphorus sulfide in the glove box with argon atmosphere protection of low moisture (≤1ppm), low oxygen content (≤1ppm), and mix with zirconium dioxide After the balls are matched, they are sealed into a ball milljar, and the mass ratio of the zirconia balls in the jar to the mixture is 2:0.7; the sealed ball mill jars are packed in a planetary high-energy ball mill and pre-mixed by a dry ball mill, and the milling time is After 5 hours, a ternary mixture of lithium sulfur and phosphorus (LiPS mixture for short) was obtained;
[0029] 2) Second high energy ball milling process:
[0030] In a glove box protected by an argon atmosphere with low moisture (≤1ppm) and low oxygen content (≤1ppm) with safe lights (such as red light), silver bromide powder equivalent to 2.5% of the above LiPS mixture mass (particle size is 200-250 mesh) and silver chloride powder (p...
Embodiment 2
[0038] Repeat Example 1, the difference is:
[0039] In step 1), the mass percentages of lithium sulfide and phosphorus sulfide are 50% and 50% respectively, and the ball milling time is 10 hours.
[0040] After the solid electrolyte powder prepared in this example was pressed into a standard sample, the ion conductivity of the sample in this example was measured to be 4.6×10 by using the AC impedance method at a room temperature of 25°C using a CHI660 electrochemical workstation. -4 S / cm.
Embodiment 3
[0042] Repeat Example 1, the difference is:
[0043] In step 1), the mass percentages of lithium sulfide and phosphorus sulfide are respectively 50% and 50%, and the time of ball milling is 2 hours;
[0044] In step 2), the particle size of the silver bromide and silver chloride powders is 300-400 mesh, the addition of the silver bromide powder is equivalent to 4.0% of the LiPS mixture quality, the addition of the silver chloride powder is equivalent to the LiPS mixture quality 2.0% of;
[0045] In step 3), the heat treatment temperature is 120° C., and the heat treatment time is 1 hour.
[0046] After the solid electrolyte powder prepared in this example was pressed into a standard sample, the ion conductivity of the sample in this example was measured at 25° C. by using a CHI660 electrochemical workstation by AC impedance method at room temperature of 5.7×10 -4 S / cm.
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technical field [0001] The invention relates to a lithium sulfide solid electrolyte material, in particular to a lithium sulfide solid electrolyte material containing silver bromide and silver chloride and a preparation method thereof. Background technique [0002] Lithium-ion batteries with high voltage and high energy density have been widely used in consumerelectronics such as laptop computers and mobile phones. In recent years, lithium batteries with high energy density have shown more and more important market prospects as power batteries for electric vehicles, and have been considered as ideal energy conversion devices for the development of the 21st century. A general lithium-ion battery is composed of a positive electrode, a negative electrode, a diaphragm, an organic electrolyte, and a sealed casing. Major safety accidents such as fires caused by flammable organic electrolytes occur from time to time. Although many studies have greatly improved the performance of ...
Claims
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Application Information
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