CN106756105B - The drop of nitride removes method in lithium metal or lithium alloy - Google Patents

The drop of nitride removes method in lithium metal or lithium alloy Download PDF

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CN106756105B
CN106756105B CN201611177870.1A CN201611177870A CN106756105B CN 106756105 B CN106756105 B CN 106756105B CN 201611177870 A CN201611177870 A CN 201611177870A CN 106756105 B CN106756105 B CN 106756105B
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lithium
alloy
lithium metal
metal
drop
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CN106756105A (en
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曹乃珍
徐川
刘强
高洁
邹崴
廖仕英
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Tianqi Lithium Industry Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/10—Obtaining alkali metals
    • C22B26/12—Obtaining lithium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C24/00—Alloys based on an alkali or an alkaline earth metal

Abstract

The present invention relates to the drops of nitride in lithium metal or lithium alloy to remove method, belongs to lithium metal technical field.The technical problem to be solved by the present invention is to provide the drops of nitride in lithium metal or lithium alloy to remove method.This method is under vacuum or inert gas shielding atmosphere; lithium metal or lithium alloy are melted and stirred; then it is added except nitrogen source A is reacted; controlling reaction temperature is 180~1000 DEG C; reaction time is 0.1~10h; it settled, filtered after the completion of reaction, filtrate is the lithium metal or lithium alloy after denitrogenating.The present invention is used as using active metal alloy and removes nitrogen source, and highly practical, at low cost, the reaction time is short, easy to operate to be easily achieved.The rate of recovery of treated by the method for the invention lithium metal or lithium alloy is 98% or more, active metal alloy less residue simultaneously, the purity of the lithium metal that do not influence that treated or lithium alloy, and the nitrogen content in lithium metal or lithium alloy can be reduced to 50ppm hereinafter, far below the standard value 300ppm or less in national standard.

Description

The drop of nitride removes method in lithium metal or lithium alloy
Technical field
The present invention relates to the drops of nitride in lithium metal or lithium alloy to remove method, belongs to lithium metal technical field.
Background technology
Lithium is metal most light in nature, is silvery white in color, density 0.534g/cm3, 180.54 DEG C of fusing point, boiling point 1336 ℃.Since 1817 Sweden geologist A Fuwei get Song (AArfvedson) find lithium for the first time in lepidolite and lithium feldspar Since, lithium is obtained in traditional fields such as glass ceramics, petrochemical industry, metallurgy, aluminium metallurgy, weaving, synthetic rubber, lubriation material, medical treatment Extensive use is arrived.In recent years, it navigates in nuclear energy power generation, aviation to the increase of lithium demand and lithium with above-mentioned traditional field It, high-energy density power battery, lightweight height than the high-tech sectors such as strong alloy development and application research deepen continuously, lithium becomes Highly important metal in industrial production is referred to as " energy metal of 21 century ".
Lithium metal, property is active, is a kind of unique gold that can be reacted with nitrogen in air under normal temperature and pressure conditions Belong to, thus, its preservation is very difficult and the shelf-life is usually shorter.In the 1960s and 1970s, U.S. government is extensive When developing nuclear energy, due to various excellent properties of lithium metal, once it was used as the cooling medium of nuclear reactor, but later through engineering reality Proof is trampled, the nitrogen impurity content in lithium metal liquid can generate serious crystalline substance more than after certain limit such as 500ppm to stainless steel Between corrode, then the problem of denitrogenating of lithium metal is formally proposed.In addition, lithium metal and its alloy are as secondary battery negative pole material When material, the exceeded ductility that can reduce lithium metal of nitrogen content so that be easy jag, breach when lithium metal pressure zone, reduce product and receive Rate increases production cost；The electrical property of final battery product can be also influenced simultaneously.Thus from the point of view of downstream is using angle, Ying Yan Lattice control the nitrogen content in lithium metal product.
But from the point of view of the production method of current lithium metal, the lithium metal in 90% or more the whole world passes through fused salt electrolysis process (electricity Solve lithium chloride and potassium chloride fused salt) it prepares, entire electrolytic process is carried out in non-closed container, and lithium metal is after cathode generation Fused salt surface, inevitable ingress of air are swum in, and is polluted by nitrogen.Thus, all contain in the lithium metal ingot of commerical grade or More or few nitrogen impurity, research shows that this impurity is mainly with Li3N forms are dissolved in lithium metal.For liquid metal lithium liquid, Nitrogen content increases with the raising of temperature, and solubility relationship approximation follows：log10(at.%N)=3.2455-2072/T, Wherein, T<723K (refers to The Li-N (Lithium-Nitrogen) System, Journal of Phase Equilibria, Vol.13, No.3,1992).Separately show that the nitrogenization speed of lithium metal is with nitrogen content through dynamics research Increase and it is quickly raised, typical self-catalysis feature is presented, thus usual to the Control of Nitrogen Content of original metal lithium product It is very stringent, it is desirable that be no more than 300ppm.
United States Atomic Energy Agency scientific research personnel E.E.Hoffman once denitrogenated method to lithium metal and carries out pilot study (THE SOLUBILITY OF NITROGEN AND OXYGEN IN LITHIUM AND METHODS OF LITHIUM PURIFICATlON, E.E.Hoffman, ORNL-2894UC-25-Metallurgy and Ceramics), it is tied as follows By：Nitrogen content in lithium metal cannot be down to desirable level (such as by the methods of vacuum distillation, filter at low temperature, cold-trap capture 100ppm or less), but being reacted under 800 DEG C of hot conditions by titanium sponge isoreactivity metal can be by the nitrogen in lithium liquid more than for 24 hours It cements out, generates stable titanium nitride, the nitrogen content in residual metallic lithium liquid can be controlled in 50ppm or less.
By calculating to thermodynamic data, studies have shown that can and Li3The metal that N reacts in addition to titanium, also zirconium, The metals such as aluminium.But the feasible chemical reaction of thermodynamics, dynamics might not be feasible, thus also need by testing to actual Reaction condition makees further research.
United States Patent (USP) US4528032, which has been put forward for the first time, uses N and Al agent for capturing each other, by removing N or Al in lithium liquid.If Li liquid In have Al impurity, pass through be added N formed AlN solids precipitation, then separation removal；If there is N impurity in Li liquid, pass through addition Al forms AlN solids precipitation, then separation removal.The patent only proposes concept, without any actual processing information, such as Temperature, mixed method, processing time, processing routine etc..
Then, United States Patent (USP) US4781756 is disclosed makees silicon source with aluminum shot, and agitation guarantee is carried out to lithium liquid with argon gas bubbles Reaction is uniform, processing time for 24 hours more than, 225~245 DEG C for the treatment of temperature, for 24 hours after settlement treatment, then with 0.5 μm of strainer mistake Filter.The patent also states that 1-4h can be reduced to processing time by making lithium source with lithium-aluminium alloy (9wt%Al)；With high Al content Lithium-aluminium alloy (20wt%Li+80wt%Al), which makees strainer, can not only remove N but also can filter simultaneously.This method processing time is long, And it is denitrogenated just for lithium metal.
United States Patent (USP) US5019158, by the way that Al is added2O3Drop is except the N and Ca in lithium simultaneously.The Al of addition2O3It is first anti-with Li Li should be generated2O and Al, Al again with Li3N reactions generate AlN precipitations, then remove；And Li2O is reacted with Ca generates CaO precipitations, after And it removes.This method is only applicable to N and Ca while needing the occasion removed, if being free of Ca in pending lithium metal, uses This method, it will combustion reaction occurs, the N in lithium metal can not be removed.
In addition, existing method is that aluminium isoreactivity metal is added to be used as except nitrogen source, reacting remaining active metal aluminium will Can remain in lithium liquid can not remove, and cause the residual quantity of aluminium higher.If theoretical amount and actual amount slightly deviation, or analysis There is large error in data, then remaining metallic aluminium will influence the quality of lithium metal or alloy.
Invention content
For disadvantages described above, the drop that the present invention provides nitride in a kind of lithium metal or lithium alloy removes method, efficiently removes Nitride in lithium metal or lithium alloy improves the quality of lithium metal and its alloy.
The technical problem to be solved by the present invention is to provide the drops of nitride in lithium metal or lithium alloy to remove method.
The drop of nitride removes method in lithium metal or lithium alloy of the present invention, includes the following steps：In vacuum or inert gas It protects under atmosphere, lithium metal or lithium alloy is melted and stirred, be then added except nitrogen source A is reacted, controlling reaction temperature is 180~1000 DEG C, the reaction time is 0.1~10h, is settled, is filtered after the completion of reaction, and filtrate is the lithium metal after denitrogenating Or lithium alloy；
Wherein, described except nitrogen source A is magnesium alloy, aluminium zircaloy, aluminum titanium alloy or lithium-aluminium alloy；
In molar ratio, nitrogen source A is removed:N=(1~1.5):1.
Preferably, the vacuum is pressure < 0.1Pa；The inert gas is helium, neon, argon gas or Krypton.
Preferably, heating rate is 100~300 DEG C/h.
Preferably, in molar ratio, nitrogen source A is removed:N=1:1.
Further, the preferably described shape except nitrogen source A is sheet, bulk, foil-like or filiform, and except the purity of nitrogen source A More than 99.5%.
Preferably, it is stirred when reaction, stirring, which is divided into, to be rotated and reverse, and the rotating forward time is identical with reversing time, stirs It is 100~500rpm to mix rate.
Preferably, filtration temperature is 200~600 DEG C, and Filter Precision is 3 μm~30 μm.
Stainless steel filter is preferably used when filtering.
Compared with prior art, the present invention has the advantages that：
1) the method for the present invention can not only remove the nitride in lithium metal, can also remove the nitride in lithium alloy, It is widely used.
2) rate of recovery of the method for the present invention treated lithium metal or lithium alloy is 98% or more, and lithium metal or lithium alloy In nitrogen content can be reduced to 50ppm hereinafter, far below the standard value 300ppm or less in national standard.
3) the method for the present invention is used as using active metal alloy and removes nitrogen source, both can effectively improve the efficiency of nitrogen retention And then improve and denitrogenate efficiency, while active metal alloy less residue, the purity of the lithium metal that do not influence that treated or lithium alloy.
4) present invention process is highly practical, at low cost, and the reaction time is short, easy to operate to be easily achieved.
Specific implementation mode
The drop of nitride removes method in lithium metal or lithium alloy of the present invention, includes the following steps：In vacuum or inert gas It protects under atmosphere, lithium metal or lithium alloy is melted and stirred, be then added except nitrogen source A is reacted, controlling reaction temperature is 180~1000 DEG C, the reaction time is 0.1~10h, is settled, is filtered after the completion of reaction, and filtrate is the lithium metal after denitrogenating Or lithium alloy；
Wherein, described except nitrogen source A is magnesium alloy, aluminium zircaloy, aluminum titanium alloy or lithium-aluminium alloy；
In molar ratio, nitrogen source A is removed:N=(1~1.5):1.
It has been investigated that active metal alloy at relatively high temperatures can stoichiometrically coefficient reacts life with lithium nitride At nitridation metal, the nitridation metal of generation is crystallized to grow up, and through gravitational settling and filtering and with lithium metal liquid or its aluminium alloy Separation collects filtrate and can be obtained the few lithium metal of nitrogen content or its alloy.Its chemical equation is as follows：
Li3N+A=AN+3Li
Herein, A represents active metal alloy, such as aluminium titanium, aluminium zirconium, magnalium, lithium aluminium.
The lithium alloy of the present invention includes but not limited to lithium-aluminium alloy, Li-Si alloy, lithium magnesium alloy etc..
The method of the present invention can be exceeded to nitrogen content lithium metal or lithium alloy handle, nitrogen therein is removed, for dropping The nitrogen content of low metal lithium and its alloy, concrete application range include but not limited to：Lithium metal and its production preparation of alloy, mistake The substandard products processing that is generated during phase commerical grade lithium metal and its alloy treatment, lithium metal and its alloy production, lithium metal and its The processing etc. of the exceeded lithium metal product and lithium system alloy product of leftover pieces, other nitrogen contents returned after the pressure zone of alloy downstream.
It is handled under vacuum or inert atmosphere, primarily to preventing the hairs such as moisture, oxygen, the nitrogen in lithium and air Raw reaction, it is preferred that the vacuum is pressure < 0.1Pa；The inert gas is helium, neon, argon gas or Krypton.
Heating rate has a certain impact to reaction tool, and heating rate is too fast, and each position of lithium liquid will be unevenly distributed, to The drop for influencing nitride is removed, and heating rate is excessively slow, influences reaction efficiency, accordingly, it is preferred that heating rate is 100~300 DEG C/h.
It is stirred after lithium metal or lithium alloy fusing, primarily to ensureing that the nitrogen content distribution at each position of lithium liquid is equal It is even.It, can be after stirring evenly, by national standard analysis method sampling analysis lithium liquid in order to accurately determine the addition except nitrogen source A Nitrogen content.
Preferably, in molar ratio, nitrogen source A is removed:N=1:1.
Except influence of the shape to the method for the present invention of nitrogen source A is little, except the shape of nitrogen source A can be piece, block, foil, silk etc. The source metal of various structure types need to only ensure that purity is more than 99.5%.
Stirring when reaction is to influence one of the key factor of reaction, and the preferred mechanical agitation of the present invention, stirring is divided into rotating forward And reversion, the rotating forward time is identical with reversing time, respectively accounts for the half of total reaction time, and stir speed (S.S.) is 100~500rpm, this Sample can be such that nitride distribution in lithium metal or its alloy more uniformly and after active metal alloy is added is reacted more with nitrogen Add uniformly, can ensure to react more efficient, evenly, processing time is shorter.It is of the present invention just to switch to initially stir when reaction The direction mixed can be clockwise or counterclockwise.If just switching to clockwise, be reversed to counterclockwise, vice versa.
After the completion of reaction, to after reaction lithium liquid or lithium alloy also settled and filtered, filter can remove nitridation metal (AN), filtrate, the lithium metal after as denitrogenating or lithium alloy are collected.Preferred filtration temperature is 200~600 DEG C, filter essence Degree is 3 μm~30 μm.
Stainless steel filter is preferably used when filtering, and longer life expectancy more cheap compared to lithium alloy filter, also not It can influence filter efficiency.
Conventional method can be used for filtrate to post-process, for example, filtrate can be cast, cooled down, sampled, taken out very Empty, packaging, obtains salable finished product.
The specific implementation mode of the present invention is further described with reference to embodiment, is not therefore limited the present invention System is among the embodiment described range.
The exceeded lithium metal of 1 nitrogen content of embodiment is denitrogenated
The exceeded Battery grade lithium metal 1.51kg of nitrogen content is placed in a sealing reaction kettle, stabilization is vacuumized to reaction kettle To < 0.1Pa, heating material is carried out, the rate of heat addition is 200 DEG C/h, stops heating after lithium metal is completely melt and starts to stir It mixes, ensures to be measured and contained by nitrogen content in national standard analysis method sampling analysis product after the nitrogen content at lithium liquid each position is evenly distributed Nitrogen quantity is 982ppm.It is Mg-Al in molar ratio:N=1:1 ratio is added into the lithium liquid of fusing weighs accurate magnalium conjunction Gold.Again reaction kettle is heated, heating rate is controlled in 100 DEG C/h, and by reaction temperature control at 300 DEG C, stir speed (S.S.) is 300rpm, reaction time 0.1h are rotated and reverse and are respectively accounted for half, are settled after the completion of reaction, natural cooling cooling, to metal Lithium liquid or aluminium alloy are filtered separation, and filtrate is cast, cool down, sample, vacuumize, is packed.Finally recycle lithium metal 1.49 Kilogram, the rate of recovery 98.7%.
Analysis data are shown in Table 1, and analysis result shows that nitrogen content is reduced to 46ppm in lithium metal after processing, is far below The 300ppm of Battery grade lithium metal professional standard, and because denitrogenating the only surplus 3ppm of the magnesium alloy for needing to be added, to downstream industry Substantially without influence.
Table 1
Embodiment 2 handles lithium metal in the case of changing except nitrogen source
Experimental method is as described in Example 1, in experiment except nitrogen source is changed to obtain the handling result under different condition, These factors are respectively to use metallic aluminium titanium, aluminium zircaloy or magnesium alloy (shape is Alloy Foil).Test arrangement is shown in Table 2, Nitrogen and the rate of recovery of residual quantity and lithium metal except nitrogen source are shown in Table 3 in lithium metal after denitrogenating.
Table 2
Table 3
Test number The content (ppm) of A The content (ppm) of N The rate of recovery (%) of Li
2-1 (Al-Zr)4 41 98
2-2 (Al-Ti)4 38 99
2-3 (Mg-Al)5 44 99
2-4 (Al-Zr)6 41 98
2-5 (Li-Al)3 40 99
The exceeded lithium-aluminium alloy of 3 nitrogen content of embodiment is denitrogenated
By to be placed in one close by the exceeded lithium-aluminium alloy of nitrogen content (standard aluminium content be 3000ppm) 1.78kg due to packages in damaged condition It seals in reaction kettle, is passed through nitrogen in a kettle, under nitrogen protection, carry out heating material, the rate of heat addition is 200 DEG C/h, when Alloy stops heating and starts to stir after being completely melt, ensures to divide by professional standard after the nitrogen content at each position of lithium liquid is evenly distributed Nitrogen content, aluminium content in analysis method sampling analysis product, it is 467ppm, aluminium content 2915ppm to measure nitrogen content.In molar ratio For Al-Zr:N=1:1 ratio is added into the lithium liquid of fusing weighs accurate aluminium zircaloy grain 1.603g.Again to reaction kettle Heating, heating rate are controlled in 200 DEG C/h, and by reaction temperature control at 600 DEG C, stir speed (S.S.) 300rpm, the reaction time 10h is rotated and reverse and is respectively accounted for half, is settled after the completion of reaction, natural cooling cooling, separation is filtered to aluminium alloy, Filtrate is cast, cool down, sample, vacuumize, is packed.The lithium-aluminium alloy finally recycled can reach LITHIUM BATTERY standard, yield It it is 1.7 kilograms, yield reaches 95%.
Analysis data are shown in Table 4.Test result shows that treated that lithium-aluminium alloy product nitrogen content is reduced to by this method 40ppm, and the variation of its aluminium content is little.
Table 4
Comparative example 1 is used as using metallic aluminium except nitrogen source recycles lithium metal
Experimental method is as described in Example 1, only to, except nitrogen source is changed, magnesium alloy being changed to metallic aluminium in experiment As except nitrogen source.The lithium metal finally recycled is 1.47 kilograms, the rate of recovery 98.7%.
It analyzes lithium metal ingredient to find, nitrogen content is down to 40ppm in lithium metal after processing, and needs to add because denitrogenating The aluminium residue 20ppm entered.It is used as according to metallic aluminium and removes nitrogen source, reacting that remaining metallic aluminium will remain in lithium liquid can not Removal, causes the residual quantity of aluminium higher.
Further, if large error occur in theoretical amount and actual amount slightly deviation, or analysis data, then remaining gold Belong to the quality that aluminium will influence lithium metal or alloy.
Comparative example 2 is used as using metallic aluminium except nitrogen source recycles lithium alloy
Experimental method is as described in Example 3, only to, except nitrogen source is changed, aluminium zircaloy being changed to metallic aluminium in experiment As except nitrogen source.The lithium-aluminium alloy finally recycled is 1.67 kilograms, the rate of recovery 94%.
It analyzes lithium-aluminium alloy ingredient to find, nitrogen content is down to 45ppm in lithium-aluminium alloy after processing, and needs because denitrogenating The aluminium residue 100ppm to be added.It is used as according to metallic aluminium and removes nitrogen source, reacted remaining metallic aluminium and will remain in lithium liquid and work as In can not remove, cause the residual quantity of aluminium higher.
If large error occur in theoretical amount and actual amount slightly deviation, or analysis data, then remaining metallic aluminium will Influence the quality of lithium metal or alloy.
To sum up, the present invention is used as using alloy and removes nitrogen source, can be more easy to effectively control the residual volume that metal is added.

Claims (8)

1. the drop of nitride removes method in lithium metal or lithium alloy, it is characterised in that：Include the following steps：
Under vacuum or inert gas shielding atmosphere, lithium metal or lithium alloy are melted and stirred, is then added except nitrogen source A is carried out Reaction, controlling reaction temperature are 180~1000 DEG C, reaction time 0.1h, are settled, are filtered after the completion of reaction, filtrate is For the lithium metal or lithium alloy after denitrogenating；
Wherein, described except nitrogen source A is magnesium alloy；
In molar ratio, nitrogen source A is removed:N=(1~1.5):1.
2. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：The vacuum For pressure < 0.1Pa；The inert gas is helium, neon, argon gas or Krypton.
3. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：Heating rate For 100~300 DEG C/h.
4. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：By mole Than removing nitrogen source A:N=1:1.
5. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：It is described to denitrogenate The shape of source A is sheet, bulk, foil-like or filiform, and purity is more than 99.5%.
6. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：It is stirred when reaction It mixes, stirring, which is divided into, to be rotated and reverse, and the rotating forward time is identical with reversing time, and stir speed (S.S.) is 100~500rpm.
7. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：Filtration temperature It it is 200~600 DEG C, Filter Precision is 3 μm~30 μm.
8. the drop of nitride removes method in lithium metal according to claim 1 or lithium alloy, it is characterised in that：The filtering Using stainless steel filter.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528032A (en) * 1984-01-10 1985-07-09 The United States Of America As Represented By The United States Department Of Energy Lithium purification technique
US4781756A (en) * 1987-07-02 1988-11-01 Lithium Corporation Of America Removal of lithium nitride from lithium metal
US5019158A (en) * 1989-06-09 1991-05-28 Metaux Speciaux S.A. Process for the separation of calcium and nitrogen from lithium
CN102409174A (en) * 2010-09-23 2012-04-11 株式会社半导体能源研究所 Method for recovering metallic lithium
CN103379972A (en) * 2010-09-28 2013-10-30 罗克伍德锂有限责任公司 Stabilized, pure lithium metal powder and method for producing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528032A (en) * 1984-01-10 1985-07-09 The United States Of America As Represented By The United States Department Of Energy Lithium purification technique
US4781756A (en) * 1987-07-02 1988-11-01 Lithium Corporation Of America Removal of lithium nitride from lithium metal
US5019158A (en) * 1989-06-09 1991-05-28 Metaux Speciaux S.A. Process for the separation of calcium and nitrogen from lithium
CN102409174A (en) * 2010-09-23 2012-04-11 株式会社半导体能源研究所 Method for recovering metallic lithium
CN103379972A (en) * 2010-09-28 2013-10-30 罗克伍德锂有限责任公司 Stabilized, pure lithium metal powder and method for producing the same

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