CN112331909A - Lithium ion conductor of ammonia-doped lithium borohydride composite material system and preparation method thereof - Google Patents
Lithium ion conductor of ammonia-doped lithium borohydride composite material system and preparation method thereof Download PDFInfo
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- 239000012448 Lithium borohydride Substances 0.000 title claims abstract description 67
- 239000010416 ion conductor Substances 0.000 title claims abstract description 49
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000000498 ball milling Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 38
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- 229910052681 coesite Inorganic materials 0.000 claims description 25
- 229910052906 cristobalite Inorganic materials 0.000 claims description 25
- 229910052682 stishovite Inorganic materials 0.000 claims description 25
- 229910052905 tridymite Inorganic materials 0.000 claims description 25
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 229910002984 Li7La3Zr2O12 Inorganic materials 0.000 claims 2
- PWKWDCOTNGQLID-UHFFFAOYSA-N [N].[Ar] Chemical compound [N].[Ar] PWKWDCOTNGQLID-UHFFFAOYSA-N 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 239000007784 solid electrolyte Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 11
- 239000011246 composite particle Substances 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910013698 LiNH2 Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
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- 230000000536 complexating effect Effects 0.000 description 1
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- 238000002484 cyclic voltammetry Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a lithium ion conductor of an ammonia-doped lithium borohydride composite material system and a preparation method thereof, belongs to the field of all-solid-state lithium batteries, and provides a method for improving the ion conduction rate of a lithium borohydride lithium ion conductor, wherein the conductivity of the modified composite solid-state lithium ion conductor is improved to 10 at room temperature‑4 Scm‑1And the above. The lithium ion conductor of the invention comprises LiBH4-oxide-NH3Three-phase system, reacting LiBH in the absence of air4Mixing the mixture with oxide particles according to the formula ratio, and then mechanically ball-milling the mixture by using a planetary wheel ball mill under the protection of inert atmosphere to uniformly mix the sample to obtain LiBH4And a composite of oxide particles. The invention obtains the lithium ion conductor with excellent room temperature performance, has the possibility of becoming the solid electrolyte of the all-solid-state lithium ion battery, has simple preparation process,good repeatability and suitability for large-scale commercial production.
Description
Technical Field
The invention belongs to the field of all-solid-state lithium batteries, and particularly relates to a lithium ion conductor of an ammonia-doped lithium borohydride composite material system and a preparation method thereof.
Background
The current commercial lithium ion battery cannot meet the increasing demands of the society on portable electronic products, electric vehicles and power grid energy storage systems. Therefore, the development of lithium ion batteries with higher energy density, longer cycle life, safer application levels, and more reasonable price has become the most urgent problem to be solved at the present time. In addition, the unstable electrochemical performance, lower ion selectivity and unreliable safety of the liquid electrolyte of conventional batteries have always limited the innovation of battery technology.
The lithium ion conductor can not only solve the existing problems, but also provide possibilities for the development of new batteries. Ionic conductivity is a key property measure for lithium ion conductors. However, other performance metrics are equally non-trivial in practical applications of electrochemical energy storage and conversion systems. The following main performance indexes are used for measuring the quality of the lithium ion conductor: high ionic conductivity, low ionic area specific resistance, high electronic area specific resistance, high ionic selectivity, wide and stable electrochemical window, good chemical compatibility with electrode materials, excellent thermal stability and mechanical properties, simple manufacturing process, low cost, convenience for equipment integration and environmental protection.
Compared with other lithium ion conductors, the lithium borohydride (LiBH 4) has obvious advantages in the aspects of high ion conductivity, good ion selectivity, low ion area specific resistance, high electron area specific resistance, excellent mechanical properties, easiness in equipment integration, environmental protection and the like. The main problems limiting the application are represented by the poor chemical and thermal stability, and the low conductivity at room temperature. In 2007, the research group professor Shin-ichi Orimo, northeast university of japan, for the first time, caused LiBH4 to rapidly release hydrogen gas by microwave irradiation at 380K, accompanied by a change in crystal structure. From the results of the dielectric constant and conductivity measurements, it was subsequently confirmed that the low temperature phase of LiBH4 was an insulator, while the high temperature phase (380K) exhibited an ionic conductivity on the order of 10-3 Scm-1. Subsequent work was expanded around how LiBH4 reached the conductivity possessed by the high temperature phase at room temperature. In 2015, a full cell test was performed on LiBH4 series materials at high temperature by professor Udovic of the national institute of standards and technology, confirming its applicability as a lithium ion conductor. However, since the temperature tested was always above 373K, the application of LiBH4 at room temperature was limited first; secondly, too high temperature leads to too poor electrochemical stability and thermal stability of the material, and byproducts are easily generated to affect the performance of the battery. Obviously, the temperature is a key factor for determining whether LiBH4 can be widely used as a lithium ion conductor. The research group taught by Orimo has developed sequentially LiBH4-LiX (X = Cl, Br, I) and LiBH4-LiNH2, among other complexes, aimed at lowering the phase transition temperature of LiBH4 or low temperature complexing with other materials to form a high temperature phase. In addition, patent CN201711268024.5 proposes a solution to the problem of lithium dendrite and interfacial resistance of all-solid-state batteries due to the inability of the solid electrolyte to be well compatible with both the metallic lithium negative electrode and the high-voltage positive electrode. Patent CN201711268024.5 provides a lithium borohydride compound fast ion conductor, the room temperature ion conduction performance of which is only improved to 10-5 Scm-1. However, the room temperature conductivity of the lithium borohydride complex is not effectively improved, and a great deal of research space is left for commercial application.
Disclosure of Invention
The invention provides a lithium ion conductor of an ammonia-doped lithium borohydride composite material system and a preparation method thereof, and provides a method capable of improving the ion conduction rate of the lithium borohydride lithium ion conductor, wherein the conductivity of the modified composite solid lithium ion conductor at room temperature is improved to 10 < -4 > Scm < -1 > or above.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lithium ion conductor of an ammonia-doped lithium borohydride composite material system is a LiBH 4-oxide-NH 3 three-phase system, and the ammonia is doped with a composite of lithium borohydride and an oxide; the molar ratio of the LiBH4 to the oxide is (1-10): 1, the mole ratio of the compounded LiBH 4-oxide mixture to ammonia gas is 1: (0.1 to 1).
The oxide in the lithium ion conductor is SiO2, Al2O3 or Li7La3Zr2O1 nanoparticles, and the molar ratio of the LiBH4 to the oxide is 1:1, the room-temperature ionic conductivity of the lithium ion conductor is more than 10 < -4 > S cm < -1 >, and the ionic conductivity can reach more than 10 < -2 > S cm < -1 > along with the temperature rise to 45 ℃.
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
step S1: mixing LiBH4 and oxide particles according to a formula amount under a protective atmosphere, and then carrying out ball milling to uniformly mix a sample to obtain a compound of lithium borohydride and the oxide particles;
step S2: and (4) ammoniating the compound of the lithium borohydride and the oxide particles obtained in the step (S1) at room temperature to obtain the lithium ion conductor of the ammonia-doped lithium borohydride composite material system at room temperature.
In the above steps, the protective atmosphere in step S1 is argon, nitrogen, or a mixture of nitrogen and argon; the formula weight of the LiBH4 and the oxide particles is (1-10): 1; the oxide particles are SiO2, Al2O3 or LLZO; the ball milling conditions are as follows: the ball-material ratio is (30-50) to 1, the ball milling time is 2-20 h, the revolution speed is 600 rpm, and stainless steel grinding balls are adopted for ball milling; in step S2, the molar ratio of the compound of lithium borohydride and oxide particles to ammonia gas is 1: (0.1 to 1).
Has the advantages that: the invention provides a lithium ion conductor of an ammonia-doped lithium borohydride composite material system and a preparation method thereof.A compound is formed after LiBH4 oxide particles are compounded with ammonia, the ionic conductivity of the compound is higher than that of pure LiBH4 by at least 4 orders of magnitude in the whole measurement temperature range, particularly the room temperature can reach 10 < -4 > S cm < -1 >, and the ionic conductivity can reach more than 10 < -2 > S cm < -1 > as the temperature rises to 45 ℃. The compound prepared by the invention has stable chemical property, can be stably used as a fast ion conductor at the temperature of 20-60 ℃, has no phase change of components in ball milling and multiple cyclic voltammetry tests, and lays a foundation for the application of the system in the future solid electrolyte.
Drawings
FIG. 1 is a plot of the conductivity of LiBH4 as a function of temperature for an example of the present invention;
FIG. 2 is a plot of the conductivity of LiBH4@ SiO2 as a function of temperature for an example of the present invention;
FIG. 3 is a plot of the conductivity versus temperature for LiBH4@ SiO2@ NH3 in an example of the present invention;
FIG. 4 is an X-ray diffraction pattern of SiO2 in accordance with an embodiment of the present invention;
FIG. 5 is an X-ray diffraction pattern of Li (NH3) XBH4-SiO2 (X =0, 0.1, 0.2, 0.3, 0.4) in accordance with an embodiment of the present invention;
fig. 6X-ray diffraction pattern of Li (NH3) XBH4-SiO2 (X =0.5, 0.6, 0.7, 0.8, 0.9, 1.0) in the present example.
Detailed Description
The invention is described in detail below with reference to the following figures and specific examples:
example 1
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
under the condition of air isolation, LiBH4 and SiO2 are filled into a stainless steel ball grinding tank according to the set molar ratio of 2: 1; adopting a mechanical ball milling mode of a planetary wheel ball mill, and obtaining LiBH4-SiO2 compound particles under the protection of high-purity nitrogen gas, wherein the total mass of a sample in a ball tank is 500 mg, the ball-material ratio is 30:1, the ball milling time is 5 h, and the revolution speed is 600 rpm; collecting a sample, placing the sample in a stainless steel closed tube, accurately controlling the sample through a flowmeter at room temperature of 25 ℃, and doping 0.1 mol of ammonia gas into 1 mol of LiBH4-SiO2 composite particles to obtain the ammonia gas doped composite fast ion conductor.
FIG. 1 is a plot of conductivity of pure phase LiBH4 as a function of temperature, from which it can be seen that the conductivity of LiBH4 at 50 ℃ is on the order of 10-8S cm-1, with very low ionic conductivity; FIG. 2 shows the conductivity of LiBH4 and SiO2 after being uniformly mixed, which is improved to a certain extent compared with pure phase LiBH4, and reaches the level of 10-6S cm < -1 > at 50 ℃; FIG. 3 shows a NH3 complexed LiBH4 and SiO2 mixture prepared as described above, which has a room temperature conductivity of 10-4S cm-1, and when the temperature is raised to 45 ℃, the ionic conductivity can reach 10-2S cm-1, and the increase in ionic conductivity is very high enough to be comparable to that of a commercially available liquid electrolyte.
Example 2
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
under the condition of air isolation, LiBH4 and SiO2 are filled into a stainless steel ball grinding tank according to a set molar ratio of 4: 1; adopting a mechanical ball milling mode of a planetary wheel ball mill, and obtaining LiBH4-SiO2 compound particles under the protection of high-purity argon gas, wherein the total mass of a sample in a ball tank is 500 mg, the ball-to-material ratio is 40:1, the ball milling time is 10 h, and the revolution speed is 600 rpm; collecting a sample, placing the sample in a stainless steel closed tube, accurately controlling the sample through a flowmeter at room temperature of 25 ℃, and doping 0.1 mol of ammonia gas into 1 mol of composite particles to obtain the ammonia gas doped composite fast ion conductor.
Example 3
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
under the condition of air isolation, LiBH4 and SiO2 are filled into a stainless steel ball grinding tank according to the set molar ratio of 2: 1; adopting a mechanical ball milling mode of a planetary wheel ball mill, under the protection of high-purity nitrogen and argon gas, obtaining LiBH4-SiO2 compound particles, wherein the total mass of a sample in a ball tank is 500 mg, the ball-to-material ratio is 30:1, the ball milling time is 10 h, and the revolution speed is 400 rpm; collecting a sample, placing the sample in a stainless steel closed tube, accurately controlling the sample through a flowmeter at room temperature of 25 ℃, and doping 0.5 mol of ammonia gas into 1 mol of composite particles to obtain the ammonia gas doped composite fast ion conductor.
Example 4
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
under the condition of air isolation, LiBH4 and SiO2 are filled into a stainless steel ball milling tank according to a set molar ratio of 3: 1; obtaining LiBH4-SiO2 compound particles in a mechanical ball milling mode of a planetary wheel ball mill under the protection of high-purity inert gas; the total mass of the sample in the spherical tank is 500 mg, the ball-material ratio is 40:1, the ball milling time is 8 h, and the revolution speed is 500 rpm; collecting a sample, and placing the sample in a stainless steel closed tube; under the condition of room temperature of 25 ℃, a flow meter is used for precise control, 0.5 mol of ammonia gas is doped into 1 mol of composite particles, and the ammonia gas doped composite fast ion conductor is obtained.
Example 5
A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system comprises the following steps:
under the condition of air isolation, LiBH4 and SiO2 are loaded into a stainless steel ball grinding tank according to a set molar ratio of 1:1, and LiBH4-SiO2 compound particles are respectively obtained in a mechanical ball grinding mode of a planetary ball mill under the protection of high-purity nitrogen gas, wherein the total mass of a sample in the ball grinding tank is 500 mg, the ball-material ratio is 30:1, the ball grinding time is 20 hours, and the revolution speed is 500 rpm; collecting a sample, placing the sample in a stainless steel closed tube, accurately controlling the sample through a flowmeter at room temperature of 25 ℃, and doping 0.2 mol of ammonia gas into 1 mol of composite particles to obtain the ammonia gas doped composite fast ion conductor.
The sample prepared above was subjected to XRD testing, the sample cell was covered with a teflon polymer film and sealed with a vacuum glue to prevent water and oxygen in the air from acting on the sample. The obtained XRD patterns are shown in figures 4, 5 and 6, and figure 4 is amorphous phase XRD of SiO2, wherein the oxide structure is not changed; as can be seen from the results of fig. 5 and 6, the prepared Li (NH3) XBH4-SiO2 (X =0, 0.1, 0.2, 0.3, 0.4) and Li (NH3) XBH4-SiO2 (X =0.5, 0.6, 0.7, 0.8, 0.9, 1.0) in different proportions have a change in the overall phase structure and a shift in the peak position to some extent, as compared with the standard phase LiBH 4.
The above description is only a preferred embodiment of the present invention, and the purpose, technical solution and advantages of the present invention are further described in detail without limiting the invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The lithium ion conductor of the ammonia-doped lithium borohydride composite material system is characterized in that the lithium ion conductor is LiBH4-oxide-NH3Doping a compound of lithium borohydride and an oxide with ammonia gas in a three-phase system; the LiBH4And the molar ratio of the oxide to the metal oxide is (1-10): 1, complexed LiBH4Oxidation ofThe molar ratio of the mixture of substances to ammonia gas is 1: (0.1 to 1).
2. The lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 1, wherein the LiBH is4And oxides in a molar ratio of 1: 1.
3. the lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 1 or 2, wherein the oxide is SiO2、Al2O3Or Li7La3Zr2O12And (3) nanoparticles.
4. The lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 1, wherein the lithium ion conductor has an ionic conductivity of 10 at room temperature-4 S cm-1The above.
5. The lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 1 or 4, characterized in that the temperature is increased to 45 ℃ with increasing temperatureoC, the ionic conductivity of the lithium ion conductor reaches 10-2 S cm-1The above.
6. A preparation method of a lithium ion conductor of an ammonia-doped lithium borohydride composite material system is characterized by comprising the following steps:
step S1: under a protective atmosphere, LiBH4Mixing the mixture with oxide particles according to the formula amount, and then carrying out ball milling to uniformly mix a sample to obtain a compound of lithium borohydride and the oxide particles;
step S2: and (4) ammoniating the compound of the lithium borohydride and the oxide particles obtained in the step (S1) at room temperature to obtain the lithium ion conductor of the ammonia-doped lithium borohydride composite material system at room temperature.
7. The ammonia-doped lithium borohydride compound of claim 5The preparation method of the lithium ion conductor of the composite material system is characterized in that the protective atmosphere in the step S1 is argon, nitrogen or nitrogen-argon mixed gas; the LiBH4The molar ratio of the oxide particles to the oxide particles is (1-10): 1.
8. the method for preparing a lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 5 or 7, wherein the oxide particles are SiO2、Al2O3Or Li7La3Zr2O12。
9. The method for preparing a lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 5, wherein the ball milling conditions are as follows: the ball-material ratio is (30-50): 1, the ball milling time is 2-20 h, the revolution speed is 600 rpm, and stainless steel grinding balls are adopted for ball milling.
10. The method for preparing a lithium ion conductor of an ammonia-doped lithium borohydride composite system according to claim 5, wherein the molar ratio of the composite of lithium borohydride and oxide particles to ammonia gas in step S2 is 1: (0.1 to 1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113991171A (en) * | 2021-10-22 | 2022-01-28 | 浙江大学 | Garnet type multi-element composite solid electrolyte and preparation method and application thereof |
| CN116487693A (en) * | 2023-06-08 | 2023-07-25 | 安徽工业大学 | Solid electrolyte using alumina/lithium borohydride as filler, preparation method and application |
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