CN104993096A - Lithium-sulfur battery electrode and preparation method of lithium-sulfur battery containing the same - Google Patents

Lithium-sulfur battery electrode and preparation method of lithium-sulfur battery containing the same Download PDF

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CN104993096A
CN104993096A CN201510274573.8A CN201510274573A CN104993096A CN 104993096 A CN104993096 A CN 104993096A CN 201510274573 A CN201510274573 A CN 201510274573A CN 104993096 A CN104993096 A CN 104993096A
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lithium
electrode
slurry
layer
overlay
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杨玉洁
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Guangdong Candle Light New Energy Technology Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139Processes of manufacture
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery electrode. The lithium-sulfur battery electrode is composed of a current collector and a coating layer. The coating layer has an n-layer structure, i.e. a first layer, a second layer...an n-th layer respectively from the current collector side to the coating layer surface, and n is an integer greater than or equal to 2. The sulfur content of each coating layer is a1%, a2%...an% respectively, and a1 is greater than or equal to a2, a2 is greater than or equal to...greater than or equal to an. The sulfur content is lower when the distance to the electrode surface layer is shorter, after lithium intercalation, the formed lithium sulfide content is correspondingly lower, and the fixation effect of the non-sulfur component substance on the sulfide is stronger. Thus, the difficulty for the lithium sulfide to move to the cathode side is larger, thus solving the problems that the lithium sulfide dissolves in the electrolyte solution and diffuses to the cathode side.

Description

The preparation method of a kind of lithium sulphur battery electrode and the lithium-sulfur cell containing this electrode
Technical field
The invention belongs to lithium-sulfur cell field, particularly relate to a kind of lithium sulphur battery electrode, lithium-sulfur cell containing this electrode and preparation method thereof.
Background technology
Since 1991, material with carbon element is creationary applies to field of lithium ion battery, and bringing the revolutionary change in this field, namely efficient and the carrying out of safety is repeatedly after discharge and recharge, and it is just applied on mobile phone, video camera, notebook computer and other portable electronics widely.Compared with traditional plumbic acid, Ni-Cd, MH-Ni battery, lithium ion battery has higher specific volume energy density, weight/power ratio energy density, better environment friendly, less self discharge and longer cycle life etc., is 21st century desirable movable electrical appliances power supply, electric car power supply and electricity storage station electrical storage device.
But the new demand that along with the raising of sampling of living, people propose gentlier mobile electrical appliance, thinner, less, more lasting, price is lower, just new requirement is proposed to the power supply device of these equipment accordingly; Energy density is higher, low price; This wherein power supply device (battery) energy density and Consumer's Experience closely bound up, enjoy the concern of consumers in general, and the method that present stage improves battery energy density mainly concentrates on the new positive/negative material of exploitation, the positive electrode of development of new is particularly remarkable to battery energy density lifting effect.
Current commercial positive electrode is the lithium transition-metal oxide (as cobalt acid lithium, LiMn2O4) of stratiform or spinel structure and the LiFePO4 etc. of olivine structural mainly.Cobalt acid lithium (LiCoO 2) theoretical capacity relatively large (275mAh/g), but actual discharge capacity only about 160mAh/g, and its price is high, there is certain toxicity, and easily there is exothermal decomposition reactions when overcharging in this positive electrode, not only make battery capacity obviously decline, cell safety is also threatened simultaneously.LiMn2O4 (LiMn 2o 4) theoretical capacity be 148mAh/g, actual capacity is lower than 130mAh/g, and its compacted density is not high, and energy density is low, poor stability, in charge and discharge process, easily cause lattice deformability, causes cycle efficieny on the low side.LiFePO4 (LiFePO 4) theoretical capacity be 172mAh/g, but this positive electrode compacted density is low, and the battery core energy density prepared is corresponding less.Above-mentioned conventional anode material for lithium-ion batteries capacity is general not high, all there are some problems simultaneously yet, can not meet battery development requirement.
The theoretical specific capacity of elemental sulfur is 1675mAh/g, and the theory of the positive electrode used higher than current business far away must capacity, becomes the main trend of present battery development.But in charge and discharge process, elemental sulfur can be converted into polysulfide, and polysulfide can be dissolved in liquid organic solution liquid, cause the loss of active material in cyclic process, more seriously, the sulfide dissolved will be separated out at negative pole and be formed dendrite, have the risk piercing through barrier film greatly, thus cause the fail safe extreme difference of battery.
For the lithium sulphide dissolves problem that lithium-sulphur cell positive electrode is formed in charge and discharge process, a kind of new lithium sulphur battery electrode of necessary exploitation, in order to solve the rear lithium sulphide dissolves diffusion problem formed of lithium-sulphur cell positive electrode electric discharge.
Summary of the invention
The object of the invention is to: for the deficiencies in the prior art, and a kind of lithium sulphur battery electrode provided: be made up of collector and overlay, described overlay has n Rotating fields, is respectively the 1st layer, the 2nd layer by collector side to overlay surface ... n-th layer, n is integer and n >=2; In every layer of coating, sulfur content is respectively a1%, a2% ... an%, and a1 >=a2 >=... >=an.Due to the closer to electrode top layer, sulfur content is lower, the lithium sulfide content formed after embedding lithium is corresponding lower, the fixation of non-sulphur component substance to sulfide will be stronger, therefore to move to the difficulty of going negative pole side larger for lithium sulfide, thus solve to reach and solve lithium sulphide dissolves in electrolyte and be diffused into the problem of negative pole side.
To achieve these goals, the present invention adopts following technical scheme:
A kind of lithium sulphur battery electrode, be made up of collector and overlay, described overlay has n Rotating fields, is respectively the 1st layer, the 2nd layer by collector side to overlay surface ... n-th layer, n is integer and n >=2; In every layer of coating, sulfur content is respectively a1%, a2% ... an%, and a1 >=a2 >=... >=an; In described overlay, the thickness of i-th layer is hi, then hi >=1 μm, and in the overlay of most top layer, the bore dia (or equivalent diameter) of the porous coating of formation is no more than 10 μm.
One as lithium sulphur battery electrode of the present invention is improved, 99.5% >=a1%>a2%> ... >an% >=0%; 400 μm >=hi >=2 μm, and in the overlay of most top layer, the bore dia (or equivalent diameter) of the porous coating of formation is no more than 4 μm.
One as lithium sulphur battery electrode of the present invention is improved, and in described overlay, sulphur is that elemental sulfur is or/and sulfide.
One as lithium sulphur battery electrode of the present invention is improved, also containing conductive component (as conductive black, super conductive carbon, Ketjen black, carbon nano-tube, Graphene etc.), bonding component (as PVDF, SBR, CMC etc.) in described overlay, and other positive active materials outside sulphur removal; And the mass ratio of said components in each layer coating of electrode is 0.5%-100%.
One as lithium sulphur battery electrode of the present invention is improved, and other positive active materials contained in described overlay comprise lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, oxide/lithium ferrite, lithium-barium oxide, ternary or multiple elements design compound and polyanion positive electrode (as LiMnPO 4, polyanionic orthosilicate etc.) at least one.
The present invention also comprises a kind of preparation method of lithium sulphur battery electrode, mainly comprises the steps:
Step 1, slurry configures: be respectively a1%, a2% according to sulfur content solid content ratio in the slurry ... an%, configuration obtains a1, a2 ... n kind slurry is stand-by altogether for an;
Step 2, coating: by a1, a2 ... an slurry, is coated in collector successively, to be formed by collector side to overlay surface respectively by with a1 slurry, a2 slurry ... the n layer coating structure that an slurry prepares, namely obtains multilayer lithium sulphur battery electrode.
One as the preparation method of lithium sulphur battery electrode of the present invention is improved, in the slurry that step 1 configures, the pass of the mass percent of sulphur in the solid content of slurry is: 99.5% >=a1%>a2%> ... >an% >=0%.
One as the preparation method of lithium sulphur battery electrode of the present invention is improved, coating process described in step 2, for by a1, a2 ... the common n kind slurry of an applies successively on a current collector and (namely first applies a1 slurry, again at this layer of coating surface coating a2 slurry after oven dry, post-drying carry out again applying until complete the coating of n kind slurry) or for by a1, a2 ... the common n kind slurry of an applies on a current collector simultaneously and (namely first applies a1 slurry, apply a2 slurry until complete the coating of n kind slurry in a1 pulp surface more afterwards, dry again afterwards).
A preparation method for lithium-sulfur cell containing above-mentioned lithium sulphur battery electrode, mainly comprise the steps: by above-mentioned lithium sulphur battery electrode with electrode, barrier film are assembled and are obtained naked battery core, enter shell/enter bag afterwards, change into, shaping obtains finished product lithium-sulfur cell.
Present invention also offers a kind of preparation method of above-mentioned lithium-sulfur cell, described is rich lithium electrode or poor lithium electrode to electrode; And when being poor lithium electrode to electrode, need to adopt benefit lithium technology to carry out benefit lithium to electrode.
Present invention also offers lithium-sulfur cell prepared by a kind of said method.
Compared with prior art, beneficial effect of the present invention is:
First, lithium-sulphur cell positive electrode coating of the present invention is sandwich construction, and in primer coating, sulfur content is high, whole electrode ensemble sulfur content ratio can be made high, thus give full play to the high characteristic of sulphur positive electrode capacity; And sulfur content is low in face coat, it can play the object intercepting sulfide diffusion, and solution sulfide diffuses to negative terminal surface precipitation and pierces through barrier film problem.
Secondly, the present invention prepares the method for lithium sulphur battery electrode, and simple possible is convenient to industrialized mass.
Embodiment
Below in conjunction with embodiment, the present invention and beneficial effect thereof are described in detail, but embodiments of the present invention are not limited thereto.
Comparative example 1,
Prepared by positive plate: by sulphur-activated carbon compound (load capacity of sulphur is 75%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry is obtained after abundant stirring, be coated in afterwards on aluminium foil, obtaining one side coating layer thickness after colding pressing is that the positive plate of 60 μm is stand-by.
Prepared by finished product battery core: the positive plate prepared, metal lithium bands and barrier film winding is obtained naked battery core, aluminum plastic film is used to carry out encapsulating into bag for packaging bag, post-drying, fluid injection, leave standstill, change into, shaping, after degasification, finally obtain shaping after battery core.
Embodiment 1,
First overlay positive plate preparation: by sulphur-activated carbon compound (load capacity of sulphur is 90%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 1 is obtained after abundant stirring, be coated in afterwards on aluminium foil, obtaining one side coating layer thickness after colding pressing is that the positive plate of 30 μm is stand-by.
The positive plate preparation of two-layer coating structure: by sulphur-activated carbon compound (load capacity of sulphur is 75%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 2 is obtained after abundant stirring, be coated in the surface of above-mentioned ground floor overlay afterwards, obtaining second layer overlay thickness after colding pressing is that the two-layer positive plate of 30 μm is stand-by (now, can control the particle diameter of sulphur-carbon complex, the maximum diameter of hole controlled in second layer overlay central hole structure is 4 μm).
Prepared by finished product battery core: the positive plate of the two-layer coating structure prepared, metal lithium bands and barrier film winding is obtained naked battery core, aluminum plastic film is used to carry out encapsulating into bag for packaging bag, post-drying, fluid injection, leave standstill, change into, shaping, after degasification, finally obtain shaping after battery core.
Embodiment 2,
First overlay positive plate preparation: by nano-sulfur particles, Graphene and bonding agent (mass ratio is 99.5:0.3:0.2) and solvent, slurry is obtained after abundant stirring, be coated in afterwards on aluminium foil, obtaining one side coating layer thickness after colding pressing is that the positive plate of 20 μm is stand-by.
The positive plate preparation of two-layer coating structure: by sulphur-graphene complex (load capacity of sulphur is 95%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 2 is obtained after abundant stirring, be coated in the surface of above-mentioned ground floor overlay afterwards, obtaining second layer overlay thickness after colding pressing is that the two-layer positive plate of 20 μm is stand-by.
The positive plate preparation of three layers of coating structure: by sulphur-graphene complex (load capacity of sulphur is 60%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 3 is obtained after abundant stirring, be coated in the surface of above-mentioned second layer overlay afterwards, obtaining third layer overlay thickness after colding pressing is that three layers of positive plate of 20 μm are stand-by.
The positive plate preparation of four layers of coating structure: by nano-grade lithium iron phosphate and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:2:4) and solvent, slurry 4 is obtained after abundant stirring, be coated in the surface of above-mentioned third layer overlay afterwards, obtaining the 4th layer of overlay thickness after colding pressing is that four layers of positive plate of 10 μm are stand-by.
Prepared by finished product battery core: adopt metal lithium sheet directly to contact the mode of mending lithium, one deck lithium band is arranged at above-mentioned double-layer structure positive plate surface uniform, carry out roll-in afterwards, thus realize carrying out rich lithium to four layers of coating positive plate obtained above, negative plate (active material is graphite) afterwards after drying and barrier film winding obtain naked battery core, aluminum plastic film is used to carry out encapsulating into bag for packaging bag, fluid injection afterwards, leave standstill, change into, shaping, after degasification, finally obtain shaping after battery core.
Embodiment 3,
First overlay positive plate preparation: by sulphur-Ketjen black compound (load capacity of sulphur is 90%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 1 is obtained after abundant stirring, be coated in afterwards on aluminium foil, obtaining one side coating layer thickness after colding pressing is that the positive plate of 400 μm is stand-by;
The positive plate preparation of two-layer coating structure: by nano-grade lithium iron phosphate, sulphur-conductive carbon composite (load capacity of sulphur is 50%) and bonding agent, conductive agent (mass ratio of above four kinds of materials is 50:44:2:4) and solvent, slurry 2 is obtained after abundant stirring, be coated in the surface of above-mentioned ground floor overlay afterwards, obtaining second layer overlay thickness after colding pressing is that the two-layer positive plate of 2 μm is stand-by.
Prepared by finished product battery core: adopt metallic lithium powder directly to contact the mode of mending lithium, one deck lithium powder is arranged at above-mentioned double-layer structure positive plate surface uniform, carry out roll-in afterwards, thus realize carrying out rich lithium to two layers of coatings positive plate obtained above, negative plate (active material is graphite) afterwards after drying and barrier film winding obtain naked battery core, aluminum plastic film is used to carry out encapsulating into bag for packaging bag, fluid injection afterwards, leave standstill, change into, shaping, after degasification, finally obtain shaping after battery core.
Embodiment 4,
First overlay positive plate preparation: by sulphur-Ketjen black compound (load capacity of sulphur is 90%) and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:3:3) and solvent, slurry 1 is obtained after abundant stirring, be coated in afterwards on aluminium foil, obtaining one side coating layer thickness after colding pressing is that the positive plate of 35 μm is stand-by;
The positive plate preparation of two-layer coating structure: by cobalt acid lithium, sulphur-conductive carbon composite (load capacity of sulphur is 50%) and bonding agent, conductive agent (mass ratio of above four kinds of materials is 50:44:2:4) and solvent, slurry 2 is obtained after abundant stirring, be coated in the surface of above-mentioned ground floor overlay afterwards, obtaining second layer overlay thickness after colding pressing is that the two-layer positive plate of 30 μm is stand-by.
The positive plate preparation of three layers of coating structure: by nano-grade lithium iron phosphate and bonding agent, conductive agent (mass ratio of above three kinds of materials is 94:2:4) and solvent, slurry 4 is obtained after abundant stirring, be coated in the surface of above-mentioned second layer overlay afterwards, obtaining third layer overlay thickness after colding pressing is that three layers of positive plate of 1 μm are stand-by.
Prepared by finished product battery core: adopt metallic lithium powder directly to contact the mode of mending lithium, one deck lithium powder is arranged at above-mentioned three-decker positive plate surface uniform, carry out roll-in afterwards, thus realize carrying out rich lithium to two layers of coatings positive plate obtained above, negative plate (active material is graphite-silicon compound) afterwards after drying and barrier film winding obtain naked battery core, aluminum plastic film is used to carry out encapsulating into bag for packaging bag, fluid injection afterwards, leave standstill, change into, shaping, after degasification, finally obtain shaping after battery core.
The present invention is tested as follows:
Volume test: carry out volume test by the battery core of following flow process to comparative example and embodiment 1-embodiment 3 in 35 DEG C of environment: leave standstill 3min; 0.5C constant current charge is to 3.8V, and constant voltage charge is to 0.05C; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D0 first to 1.5V; Complete volume test after leaving standstill 3min, acquired results is in table 1.
In 35 DEG C of environment, by following flow process, volume test is carried out to the battery core of embodiment 4: leave standstill 3min; 0.5C constant current charge is to 4.2V, and constant voltage charge is to 0.05C; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D0 first to 1.5V; Complete volume test after leaving standstill 3min, acquired results is in table 1.
Loop test: carry out loop test by the battery core of following flow process to comparative example and embodiment 1-embodiment 3 in 35 DEG C of environment: leave standstill 3min; 0.5C constant current charge is to 3.8V, and constant voltage charge is to 0.05C; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D0 first to 1.5V; Second time charging is carried out: 0.5C constant current charge is to 3.8V, and constant voltage charge is to 0.05C after leaving standstill 3min; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D1 first to 1.5V; Recirculation afterwards obtains D299 298 times; Now, battery core capability retention=D299/D0, acquired results is in table 1.
In 35 DEG C of environment, by following flow process, loop test is carried out to the battery core of embodiment 4: leave standstill 3min; 0.5C constant current charge is to 4.2V, and constant voltage charge is to 0.05C; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D0 first to 1.5V; Second time charging is carried out: 0.5C constant current charge is to 4.2V, and constant voltage charge is to 0.05C after leaving standstill 3min; Leave standstill 3min; 0.5C constant-current discharge obtains discharge capacity D1 first to 1.5V; Recirculation afterwards obtains D299 298 times; Now, battery core capability retention=D299/D0, acquired results is in table 1.
Self discharge is tested: the battery core each embodiment and comparative example being finished loop test by following flow process in RT environment carries out self discharge test: leave standstill 3min; 0.5C constant current charge is to 3.0V, and constant voltage charge is to 0.05C; Test open circuit voltage V1 after leaving standstill 72h, leave standstill 72h afterwards again and test open circuit voltage V2, self-discharge rate=(V1-V2)/72 (mV/h) of battery core, acquired results is in table 1.
Table 1, the performance table of battery core in comparative example and each embodiment
Can be obtained by table 1, the lithium-sulphur cell positive electrode sheet of sandwich construction of the present invention, effectively can improve the total content of active material sulphur in battery anode slice, thus improve battery capacity; Meanwhile, in top layer, sulfur content is lower, and therefore its stability is better, can also intercept the diffusion of bottom lithium sulphur compound, thus improve cycle performance and the self-discharge performance of battery.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change above-mentioned execution mode and revise.Therefore, the present invention is not limited to above-mentioned embodiment, and any apparent improvement of every those skilled in the art done by basis of the present invention, replacement or modification all belong to protection scope of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.

Claims (10)

1. a lithium sulphur battery electrode, is made up of collector and overlay, it is characterized in that:
Described overlay has n Rotating fields, and be respectively the 1st layer, the 2nd layer by collector side to overlay surface ... n-th layer, n is integer and n >=2; In every layer of coating, sulfur content is respectively a1%, a2%......an%, and a1 >=a2 >=... >=an; In described overlay, the thickness of i-th layer is hi, and hi >=1 μm.
2. a lithium sulphur battery electrode according to claim 1, is characterized in that: 99.5% >=a1%>a2%>......GreatT.GreaT.G Tan% >=0%; 400 μm >=hi >=2 μm.
3. a lithium sulphur battery electrode according to claim 1, is characterized in that: in described overlay, sulphur is that elemental sulfur is or/and sulfide.
4. a lithium sulphur battery electrode according to claim 1, is characterized in that: also containing conductive component, bonding component in described overlay, and other positive active materials outside sulphur removal.
5. a lithium sulphur battery electrode according to claim 4, is characterized in that: other positive active materials contained in described overlay comprise at least one in lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, oxide/lithium ferrite, lithium-barium oxide, ternary or multiple elements design compound and polyanion positive electrode.
6. a preparation method for lithium sulphur battery electrode according to claim 1, is characterized in that, mainly comprises the steps:
Step 1, slurry configures: be respectively a1%, a2%......an% according to sulfur content solid content ratio in the slurry, and configuration obtains a1, a2......an, and n kind slurry is stand-by altogether;
Step 2, coating: by a1, a2......an slurry, be coated in collector successively, to be formed by collector side to overlay surface respectively by with a1 slurry, a2 slurry ... the n layer coating structure that an slurry prepares, namely obtains multilayer lithium sulphur battery electrode.
7. the preparation method of a lithium sulphur battery electrode according to claim 6, it is characterized in that, in the slurry that step 1 configures, the pass of the mass percent of sulphur in the solid content of slurry is: 99.5% >=a1%>a2%>......GreatT.GreaT.G Tan% >=0%.
8. the preparation method of a lithium sulphur battery electrode according to claim 6, it is characterized in that, coating process described in step 2, applies successively on a current collector for a1, a2......an being total to n kind slurry or applying on a current collector for a1, a2......an are total to n kind slurry simultaneously.
9. the preparation method of the lithium-sulfur cell containing lithium sulphur battery electrode according to claim 1, it is characterized in that, mainly comprise the steps: by electrode described in claim 1 with electrode, barrier film are assembled and are obtained naked battery core, enter shell/enter bag afterwards, change into, shaping obtains finished product lithium-sulfur cell.
10. a preparation method for lithium-sulfur cell according to claim 9, is characterized in that, described is rich lithium electrode or poor lithium electrode to electrode; And when being poor lithium electrode to electrode, need to adopt benefit lithium technology to carry out benefit lithium to electrode.
CN201510274573.8A 2015-05-26 2015-05-26 Lithium-sulfur battery electrode and preparation method of lithium-sulfur battery containing the same Pending CN104993096A (en)

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CN106207097A (en) * 2016-07-30 2016-12-07 肖丽芳 A kind of lithium-sulfur cell pole piece and the preparation method of battery thereof
CN106207095A (en) * 2016-07-30 2016-12-07 肖丽芳 A kind of lithium-sulfur cell and preparation method thereof
WO2018023218A1 (en) * 2016-07-30 2018-02-08 肖丽芳 Lithium-sulfur battery and preparation method therefor
CN106207088A (en) * 2016-09-30 2016-12-07 上海空间电源研究所 A kind of lithium-sulphur cell positive electrode and preparation method thereof
CN106207088B (en) * 2016-09-30 2019-05-03 上海空间电源研究所 A kind of lithium-sulphur cell positive electrode and preparation method thereof

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