CN106785015A - A kind of lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide and preparation method thereof - Google Patents

A kind of lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide and preparation method thereof Download PDF

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CN106785015A
CN106785015A CN201710077207.2A CN201710077207A CN106785015A CN 106785015 A CN106785015 A CN 106785015A CN 201710077207 A CN201710077207 A CN 201710077207A CN 106785015 A CN106785015 A CN 106785015A
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lithium
silver bromide
alloy
preparation
sulfide
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朱凌云
王振宇
张天锦
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Guilin Electrical Equipment Scientific Research Institute Co Ltd
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Guilin Electrical Equipment Scientific Research Institute Co Ltd
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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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention provides a kind of lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide and preparation method thereof.Described preparation method, comprises the following steps：1) under the conditions of atmosphere protection, by 2.5 3.5：0.5‑1.0：0.05‑0.20：0.01 0.1 mol ratio weighs lithium sulfide, phosphoric sulfide, Li-Si alloy powder and sulphur, is well mixed, and obtains lithium sulphur phosphorus silicon mixture；2) under the conditions of atmosphere protection and safe feux rouges, lithium sulphur phosphorus silicon mixture and the silver bromide equivalent to its quality 1 5% are taken, is placed in ball milling in ball grinder, obtain the amorphous li sulphur phosphorus silicon mixture containing silver bromide；3) gained is sealed containing the amorphous li sulphur phosphorus silicon mixture of silver bromide under the conditions of atmosphere protection, be heat-treated after being warming up to 100 180 DEG C under vacuum condition, obtain final product.The present invention is by addition Li-Si alloy simultaneously and silver bromide with the lithium ion conductivity of solid electrolyte material obtained by being lifted.

Description

A kind of lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide and its Preparation method
Technical field
The present invention relates to lithium sulfide system solid electrolyte material, and in particular to the sulphur of a kind of addition Li-Si alloy and silver bromide Change lithium system solid electrolyte material and preparation method thereof.
Background technology
Lithium ion battery with high voltage and high-energy-density, has been widely used in notebook computer and mobile phone etc. and has disappeared Take electronic product.In recent years, the lithium battery of high-energy-density has shown that as the electrokinetic cell of electric automobile and increasingly weigh The market prospects wanted, have been considered as the ideal capacity conversion equipment of 21 century development.General lithium ion battery is by positive pole, negative Pole, barrier film and organic electrolyte and the housing of sealing are constituted, and are caught fire caused by flammable organic electrolyte therein etc. great Security incident happens occasionally.Although numerous research greatly improves traditional lithium in terms of material modification and battery structure improvement The performance of ion battery, but the safety problem in use of the lithium ion battery containing organic electrolyte do not solve at all.
Flammable organic electrolyte solution is replaced to be to solve lithium ion battery in use using solid electrolyte material The best approach of safety problem.All-solid-state lithium-ion battery is generally by cathode film, negative electrode film and the solid between both positive and negative polarity layer Dielectric film is combined.Due to possessing high security without flammable organic electrolyte solution, simple layer structure energy Manufacturing cost, improve production efficiency are further reduced, while the lamination that can connect realizes Towards Higher Voltage and improves all-solid-state lithium-ion The energy density of battery, therefore all-solid-state lithium-ion battery is of increased attention in recent years.
The critical material of all-solid-state lithium-ion battery is the total solids electrolyte of high-lithium ion electrical conductivity.2000 11 Month, (p174) reports lithium sulfide (Li in the 26th solid-state ionics seminar summary of Japan2) and phosphoric sulfide (P S2S5) Mixture can form the result of lithium ion conduction body after being heat-treated through 200 degree, thus, amorphous state lithium sulfide system's solid electrolyte by Focus material of the step as all-solid lithium battery research and development.
Lithium ion solid electrolyte should have following features：1. the lithium ion in lithium ion carrier compound wants easy pole Change, i.e. the smaller easy migration of binding force；2. the transportable lithium ion density of lithium ion solid electrolyte is as high as possible, i.e., right The contributive lithium ion of lithium ion conduction will largely be present；3. diffusion of the lithium ion in solid electrolyte is by atom vacancy Quick to spread, structural relaxation present in amorphous state or quasi- crystalline solid electrolyte matrix and fault of construction and other manner are led The a large amount of atom vacancies for entering, will promote lithium ion quickly to be spread by atom vacancy, so as to possess lithium ion conductivity high.Tool The lithium sulfide based material for having lithium ion conductivity high is suitable for use as the solid electrolyte of all-solid-state lithium-ion battery.
Existing research shows that adding other compositions in lithium sulfide system solid electrolyte material can improve ionic conduction Rate, such as patent of invention of Publication No. CN101013761A, disclose three classes for the solid electrolytic of all-solid lithium-ion battery Material system, respectively：(A)Li2S+A/I, A/I is AlI in formula3、ZnI2、ZrI4Or LaI3, 0.5≤x≤1.5；(B) yLi2S-mA/I-zB/S, y+z=9 in formula, y from 5.0 to 7.0, m from 0.5 to 3, B/S be SiS2、0.5P2S5, CeS2Or 0.5B2S3；A/I is AlI3、ZnI2、ZrI4Or LaI3；(C)yLi2S-mA/I-zB/S-nLiI, y+z=9 in formula, y from 5.0 to 7.0, m from 0.5 to 3.0, n from 0.5 to 3.0, A/I be AlI3、ZnI2、ZrI4Or LaI3；B/S is SiS2、0.5P2S5, CeS2Or 0.5B2S3.The preparation method of this three based solid electrolytes material is：After dispensing is completed, vacuum seal in quartz glass tube is placed in Dress, grind into powder after quenching to room temperature after being reacted 10-14 hours at a high temperature of 500-750 DEG C afterwards.As described in the invention Solid electrolyte structure obtained in technical scheme is amorphous state, although the invention can be improved cation transport ability, But the raising of resulting materials ionic conductance is unsatisfactory, with 6Li2S-0.5AlI3-3SiS2(y=6, m=as a example by-LiI systems 0.5, z=3, n=1), the system (≤200 DEG C) under room temperature and higher temperature is mainly shown as lithium ion conductor, and its room temperature is total Electrical conductivity is only up to 3.80 × 10-6S/cm.And for example, CN101013753A also discloses that a kind of lithium for solid lithium battery Sulfur system solid electrolyte material, the material presses Li2S：A/S：P2S5=6：0.1-4.0：1.5 mol ratio is composited, in formula A/S is the sulfide of Ag, Zn, Al or Zr；Its preparation technology rises at a slow speed after dispensing, to be placed in Vacuum Package in quartz glass tube Temperature is incubated 24 hours to 450 DEG C, then is warming up to after 500-750 DEG C of reaction 10-14 hours grind into powder after quenching to room temperature.Should The raising of the ionic conductance of invention gained solid electrolyte is also undesirable, and its room temperature total conductivity is same 10-6S/cm.This Shen Ask someone to think, foregoing invention patent gained solid electrolyte ionic conductance raising it is undesirable the reason for be mainly： (1) material (such as iodide or sulfide) of addition is the hexagonal or rhomboidal crystal of stabilization, it is impossible to sent out with ambient substance Raw reaction, and more atom vacancies cannot be imported in system, it is impossible to for the diffusion of lithium ion provides more diffusion admittance； (2) content of material of addition is too high, on the one hand reduces the content as the lithium sulfide component of lithium ion carrier, on the other hand, High content, stable in properties additive does not increase the lithium ion diffusion admittance in solid electrolyte not only, hinders on the contrary The diffusion of lithium ion.Therefore, the composition for being added in foregoing invention patent is not played and is obviously improved sulfide-based solid electrolyte The effect of ionic conduction performance.
On the other hand, Li-Si Alloy Powder has been used for GND material as a kind of important materials of suitable Lithium-ion embeding The correlative study of material, such as patent of invention of Publication No. CN104766965A, there is provided a kind of nanoscale Li-Si alloy material and Preparation Method And The Use, the composition of the nanoscale Li-Si alloy material includes：Li, Si and doped chemical；Wherein, Li and Si Mol ratio be 1/100~5/1；Mole total content of Li and Si is more than or equal to 90% in the nanoscale Li-Si alloy material； The doped chemical is B, C, N, F, Na, Mg, Al, P, one or more in Cu；The nanoscale Li-Si alloy material is in office Size in one dimension of meaning is 1nm to 500nm；And explicitly point out the Li-Si Alloy Powder and can be used for thermal cell, lithium-ion electric The negative material of pond, lithium-ion capacitor, lithium sky battery, lithium-sulfur cell and all-solid-state battery.Even so, this kind of invention skill Art is used as the empty battery of thermal cell, lithium ion battery, lithium-ion capacitor, lithium-sulfur cell, lithium just with Li-Si alloy material Negative material receives the insertion of lithium ion in charging process, is not directed to by adding Li-Si Alloy Powder and silver bromide simultaneously to carry The correlative study of high solid electrolyte lithium-ion conductivity.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of lithium sulfide system solid electricity for adding Li-Si alloy and silver bromide Solution material and preparation method thereof, the method for the invention is on the one hand high by addition amount containing lithium and easily forms amorphous lithium Silicon alloy powder lifts transportable lithium concentration in lithium sulfide system solid electrolyte, on the other hand by adding silver bromide And a large amount of atom vacancies that can be used for lithium ion diffusion are formed by subsequent treatment, so as to lift lithium sulfide system solid electrolytic material The lithium ion conductivity of material.
The preparation method of the lithium sulfide system solid electrolyte material of addition Li-Si alloy of the present invention and silver bromide, bag Include following steps：
1) under the conditions of atmosphere protection, by 2.5-3.5：0.5-1.0：0.05-0.20：The mol ratio of 0.01-0.1 weighs sulphur Change lithium, phosphoric sulfide, Li-Si alloy powder and sulphur, be well mixed, obtain lithium sulphur phosphorus silicon mixture；
2) under the conditions of atmosphere protection and safe feux rouges, lithium sulphur phosphorus silicon mixture and the bromine equivalent to its quality 1-5% are taken Change silver, be placed in ball milling in ball grinder, obtain the amorphous li sulphur phosphorus silicon mixture containing silver bromide；
3) gained is sealed containing the amorphous li sulphur phosphorus silicon mixture of silver bromide under the conditions of atmosphere protection, after vacuum bar 100-180 DEG C is warming up under part to be heat-treated, that is, obtain adding the lithium sulfide system solid electrolyte of Li-Si alloy and silver bromide Material.
The step of above method 1) in, the mol ratio of the lithium sulfide, phosphoric sulfide, Li-Si alloy powder and sulphur is preferably 2.5-3.0：0.5-0.75：0.05-0.10：0.01-0.05.Described Li-Si alloy powder preferably use major event structure for Li13Si4- 300 mesh Li-Si alloy powder, sulphur preferably using -200 mesh Cosan.
The step of above-mentioned preparation method 1) in, described atmosphere protection is typically under the protection of inert gas, such as argon gas, The conventional use of inert gas such as nitrogen.During concrete operations, typically carried out in the glove box protected with argon gas.
The step of above-mentioned preparation method 1) in, existing conventional techniques can be used by lithium sulfide, phosphoric sulfide, Li-Si Alloy Powder End and sulphur are well mixed, and are generally well mixed by the way of ball milling them, and dry type ball milling or Jie can be used during ball milling Matter ball milling, uses zirconium dioxide mill ball during ball milling, ratio of grinding media to material is preferably 2：0.5-1 (mass ratio).More preferably using planetary High-energy ball milling is well mixed lithium sulfide, phosphoric sulfide, Li-Si alloy powder and sulphur, now by Ball-milling Time control in 5-12h Realize being sufficiently mixed for they.
The step of above-mentioned preparation method 2) in, described atmosphere protection is typically under the protection of inert gas, such as argon gas, The conventional use of inert gas such as nitrogen.During concrete operations, typically carried out in the glove box protected with argon gas.
The step of above-mentioned preparation method 2) in, described silver bromide is preferably using the bromination silver powder of -200 mesh.During ball milling, Using zirconium dioxide mill ball, ratio of grinding media to material is preferably 2：0.5-1 (mass ratio), more preferably 2：0.7 (mass ratio).This step In, the Ball-milling Time usually 30-48h of the amorphous li sulphur phosphorus silicon mixture containing silver bromide is obtained, contain to be more quickly formed The amorphous li sulphur phosphate mixture of silver bromide, ball milling is placed in after preferably silver bromide and lithium sulphur phosphorus silicon mixture stir again Ball milling in tank, now, Ball-milling Time control is completely amorphousization and bromination for being capable of achieving lithium sulphur phosphorus silicon mixture in 30-40h Silver is sufficiently mixed with lithium sulphur phosphorus silicon mixture.
The step of above-mentioned preparation method 3) in, described atmosphere protection is typically under the protection of inert gas, such as argon gas, The conventional use of inert gas such as nitrogen.Specific seal operation, is typically carried out in the glove box protected with argon gas.
The step of above-mentioned preparation method 3) in, carrying out heat treatment operation can promote a part of lithium and the week of amorphous li silicon The reaction of Salmon-Saxl for enclosing is transformed into lithium sulfide and silicon-based nano crystal or nano-cluster containing lithium, wherein the new lithium sulfide for being formed is improved The concentration of the transportable lithium ion in solid electrolytic plastidome；Another aspect heat treatment operation can promote the silver in the silver bromide of part The reaction of Salmon-Saxl of ion and surrounding, while forming a large amount of suitable lithium ions diffusions in by the body-centered cubic structure based on bromide ion Atom vacancy；Two aspect collective effects so that lithium sulfide system of the present invention solid electrolyte simultaneously have transportable lithium from Sub- concentration is high and atom vacancy more than advantage, effectively lift its ionic conductance.In this step, the time of heat treatment is usually big In or equal to 1h, preferably 1-5h；The temperature of heat treatment is more preferably 120-160 DEG C, under this temperature conditions, heat treatment Time be preferably 1-3h.
Present invention additionally comprises the lithium sulfide system solid electricity of the addition Li-Si alloy and silver bromide prepared by the above method Solution material.
Compared with prior art, the method have the characteristics that：
1st, the present invention adds silver bromide and Li-Si alloy the powder warp of certain content using lithium sulfide and phosphoric sulfide as matrix After high-energy ball milling, while amorphous mixtures are formed, reach adding ingredient Li-Si Alloy Powder and Cosan and silver bromide is equal The even effect being distributed in matrix；Thermally treated technique promotes a part of lithium of amorphous li silicon and the reaction of Salmon-Saxl of surrounding again afterwards It is transformed into lithium sulfide and silicon-based nano crystal or nano-cluster containing lithium, the new lithium sulfide for being formed improves solid electrolytic plastidome In transportable lithium ion concentration；On the other hand, Technology for Heating Processing promotes part silver ion to depart from the cubic structure of silver bromide, So as to form the interstitial void of a large amount of suitable lithium ion diffusions in the cubic structure based on bromide ion, while forming nanoscale Silver sulfide (original position separates out) and part lithium bromide；Additionally, silicon-based nano crystal or nano-cluster containing lithium are imperfect crystals, its Also substantial amounts of atom vacancy is possessed in structure, the lithium ion in solid electrolytic plastidome is moving to the crystalline substance of the silicon-based nano containing lithium During the position of body or nano-cluster and amorphous li silicon, will simultaneously there is room diffusion and lithium ion exchanged diffusion, by This can prepare the solid electrolyte powder of high-lithium ion conductivity.
The silver sulfide nanometer particles and lithium bromide product of evolution reaction in situ, all have when the 2, being heat-treated in the method for the invention Ionic conductivity, can play the effect for further improving sulfide-based solid electrolyte lithium-ion-conducting；And Dispersed precipitate Silver sulfide nanometer particles particle in lithium sulphur phosphorus silicon mixture, can stablize the microstructure of the lithium sulfide system solid electrolyte, suppression The tissue change of the solid electrolyte powder in charge and discharge process processed.
3rd, three sections of process step combinations methods are employed in the method for the invention, wherein ready-mixed operation can ensure solid The principal component of electrolyte uniformly mixes；And second high-energy ball milling mixing is carried out after adding silver bromide, adding ingredient can ensured While silver bromide is uniformly distributed, realize lithium sulphur phosphorus silicon mixture it is decrystallized with ensure the lithium high of lithium sulfide system solid electrolyte from Sub- transport properties.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, to more fully understand present disclosure, but The present invention is not limited to following examples.
The reagent used in following embodiment such as lithium sulfide (Li2) and phosphoric sulfide (P S2S5) etc., chemically pure reagent is, Purity is 99.9%.
Embodiment 1
1) high-energy ball milling operation is mixed：
In low moisture (≤1ppm), the glove box with argon gas atmosphere protection of low oxygen content (≤1ppm), will vulcanize Lithium, phosphoric sulfide, Li-Si alloy powder and Cosan are in molar ratio 2.5：0.75：0.05：0.05 ratio dispensing, stirring are mixed Close, enclose ball grinder after coordinating with the zirconia balls of diameter 3-10mm, the ball material matter of the zirconia balls in tank and compound Amount is than being 2:0.7；Ball grinder after sealing uses dry type mixing ball milling in planetary high-energy ball mill, and Ball-milling Time is 5 Hour, obtain lithium sulphur phosphorus silicon mixture；
2) secondary high-energy ball milling operation：
Protected with argon gas atmosphere in the low moisture (≤1ppm), low oxygen content (≤1ppm) for having safety light (such as feux rouges) In the glove box of shield, will be equivalent to the bromination silver powder (granularity be -300 mesh) of above-mentioned lithium sulphur phosphorus silicon mixture quality 2.5% with Lithium sulphur phosphorus silicon mixture stirring mixing by hand, gained mixed material presses 2 again:0.7 ball material mass ratio, fit diameter 3-10mm's Ball grinder is enclosed after zirconia balls, is sealed, and the ball grinder after sealing is fitted into planetary high-energy ball mill carries out high energy Dry type ball milling, Ball-milling Time is 36 hours, obtains the amorphous li sulphur phosphorus silicon mixture containing silver bromide；
3) heat treatment step：
By amorphous li sulphur phosphorus silicon mixture of the gained containing silver bromide in low moisture (≤1ppm), low oxygen content (≤1ppm) With argon gas atmosphere protection glove box in seal, after heated under vacuum to 140 DEG C be heat-treated 2 hours, obtain final product To it is of the present invention addition Li-Si alloy and silver bromide lithium sulfide system solid electrolyte material-.It is non-in heat treatment process A part of lithium of crystalline state lithium silicon and the reaction of Salmon-Saxl of surrounding are transformed into lithium sulfide and silicon-based nano crystal or nano-cluster containing lithium, newly The lithium sulfide of formation improves the concentration of the transportable lithium ion in solid electrolytic plastidome；On the other hand, Technology for Heating Processing promotees Part silver ion is set to depart from the cubic structure of silver bromide, so as to form a large amount of suitable lithiums in the cubic structure based on bromide ion The interstitial void of ion diffusion, while forming nanoscale silver sulfide (original position separates out)；Additionally, the silicon-based nano crystal containing lithium or Nano-cluster is also imperfect crystal, and substantial amounts of atom vacancy is possessed in its structure, and the lithium ion in solid electrolytic plastidome is being moved When moving on to the position of the silicon-based nano crystal containing lithium or nano-cluster and amorphous li silicon, will simultaneously have room to spread and lithium The advantage of ion exchange diffusion, so as to prepare the solid electrolyte powder with high-lithium ion conductivity.
After solid electrolyte powder is pressed into standard sample of photo obtained in the present embodiment, using CHI660 electrochemical operations Stand, using AC impedence method, at 25 DEG C of room temperature, the ionic conductance for measuring the print of the present embodiment is 3.1 × 10-4S/cm。
Comparative example
By lithium sulfide in low moisture (≤1ppm), the glove box with argon gas atmosphere protection of low oxygen content (≤1ppm) It is in molar ratio 3 with phosphoric sulfide：1 ratio dispensing, stirring mixing, encloses ball grinder, in tank after coordinating with zirconia balls Zirconia balls are 2 with the ball material mass ratio of compound:0.7；Ball grinder after sealing is adopted in planetary high-energy ball mill Ball milling is pre-mixed with dry type ball milling, Ball-milling Time is 36 hours, obtains lithium sulphur phosphorus ternary mixture solid electrolyte powder.
After solid electrolyte powder is pressed into standard sample of photo obtained in this comparative example, using CHI660 electrochemical operations Stand, using AC impedence method, at 25 DEG C of room temperature, the ionic conductance for measuring the print of this comparative example is 8.7 × 10-6S/cm。
Embodiment 2
Embodiment 1 is repeated, unlike：
Step 1) in, lithium sulfide and phosphoric sulfide and Li-Si alloy and Cosan are in molar ratio 3：1：0.1：0.05 ratio Dispensing mixes, and zirconia balls are 2 with the ball material mass ratio of compound：1, Ball-milling Time is 12 hours；
Step 2) in, the granularity of bromination silver powder is 250 to 300 mesh, and the addition of bromination silver powder is equivalent to lithium sulphur phosphorus The 3% of silicon mixture quality；
Step 3) in, heat treatment is carried out under the conditions of 150 DEG C, and heat treatment time is 2 hours.
After solid electrolyte powder is pressed into standard sample of photo obtained in the present embodiment, using CHI660 electrochemical operations Stand, using AC impedence method, at 25 DEG C of room temperature, the ionic conductance for measuring the print of the present embodiment is 5.6 × 10-4S/cm。
Embodiment 3
Embodiment 1 is repeated, unlike：
Step 1) in, lithium sulfide and phosphoric sulfide and Li-Si alloy and Cosan are in molar ratio 3：0.75：0.15：0.1 Ratio dispensing mixes, and zirconia balls are 2 with the ball material mass ratio of compound：0.5, Ball-milling Time is 8 hours；
Step 2) in, the granularity of bromination silver powder is 250 mesh, and the addition of bromination silver powder mixes equivalent to lithium sulphur phosphorus silicon The 5% of amount of substance；
Step 3) in, sealing is heat-treated 1 hour after heated under vacuum to 160 DEG C；
After solid electrolyte powder is pressed into standard sample of photo obtained in the present embodiment, using CHI660 electrochemical operations Stand, using AC impedence method, at 25 DEG C of room temperature, the ionic conductance for measuring the print of the present embodiment is 6.2 × 10-4S/cm。
Embodiment 4
Embodiment 1 is repeated, unlike：
Step 1) in, lithium sulfide and phosphoric sulfide and Li-Si alloy and Cosan are in molar ratio 3.5：1.0：0.2：0.30 Ratio dispensing mixes；
Step 2) in, the granularity of bromination silver powder is 200 to 250 mesh, and the addition of bromination silver powder is equivalent to lithium sulphur phosphorus The 1% of silicon mixture quality；
Step 3) in, sealing is heat-treated 5 hours after heated under vacuum to 100 DEG C；
After solid electrolyte powder is pressed into standard sample of photo obtained in the present embodiment, using CHI660 electrochemical workstations, Using AC impedence method, at 25 DEG C of room temperature, the ionic conductance for measuring the print of the present embodiment is 4.5 × 10-4S/cm。

Claims (7)

1. a kind of preparation method of the lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide, including following step Suddenly：
1) under the conditions of atmosphere protection, by 2.5-3.5：0.5-1.0：0.05-0.20：The mol ratio of 0.01-0.1 weighs vulcanization Lithium, phosphoric sulfide, Li-Si alloy powder and sulphur, are well mixed, and obtain lithium sulphur phosphorus silicon mixture；
2) under the conditions of atmosphere protection and safe feux rouges, lithium sulphur phosphorus silicon mixture and the silver bromide equivalent to its quality 1-5% are taken, Ball milling in ball grinder is placed in, the amorphous li sulphur phosphorus silicon mixture containing silver bromide is obtained；
3) gained is sealed containing the amorphous li sulphur phosphorus silicon mixture of silver bromide under the conditions of atmosphere protection, after under vacuum condition It is warming up to 100-180 DEG C to be heat-treated, that is, obtains adding the lithium sulfide system solid electrolyte material of Li-Si alloy and silver bromide.
2. preparation method according to claim 1, it is characterised in that：Step 1) in, the lithium sulfide, phosphoric sulfide, lithium silicon The mol ratio of alloy powder and sulphur is 2.5-3.0：0.5-0.75：0.05-0.10：0.01-0.05.
3. preparation method according to claim 1, it is characterised in that：Step 3) in, time of heat treatment be more than or wait In 1h.
4. preparation method according to claim 1, it is characterised in that：Step 3) in, the time of heat treatment is 1-5h.
5. the preparation method according to any one of claim 1-4, it is characterised in that：Step 2) in, the time of ball milling is 30-48h。
6. preparation method according to claim 5, it is characterised in that：Ratio of grinding media to material during ball milling is 2：0.5-1.
7. any one of claim 1-6 methods are prepared addition Li-Si alloy and the lithium sulfide system solid electrolytic of silver bromide Material.
CN201710077207.2A 2017-02-13 2017-02-13 A kind of lithium sulfide system solid electrolyte material for adding Li-Si alloy and silver bromide and preparation method thereof Pending CN106785015A (en)

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Application publication date: 20170531