CN208111570U - A kind of novel lithium metal battery - Google Patents
A kind of novel lithium metal battery Download PDFInfo
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- CN208111570U CN208111570U CN201820138451.5U CN201820138451U CN208111570U CN 208111570 U CN208111570 U CN 208111570U CN 201820138451 U CN201820138451 U CN 201820138451U CN 208111570 U CN208111570 U CN 208111570U
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- lithium metal
- pole piece
- collector
- metal battery
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- 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
Abstract
The utility model discloses a kind of novel lithium metal battery, including cathode pole piece, anode pole piece and diaphragm for the cathode pole piece and the anode pole piece to be isolated；The cathode pole piece includes collector and the poly- melamine foamed plastic buffer layer that fits closely with the collector；Filled with the lithium metal obturator to match with its three dimensional skeletal structure in the poly- melamine foamed plastic buffer layer；The collector is fitted closely backwards to the side of poly- melamine foamed plastic buffer layer with the diaphragm.The utility model provides a kind of lithium metal battery, by having fitted closely the internal poly- melamine foamed plastic buffer layer for being filled with lithium metal obturator on the collector of cathode pole piece, the growth for effectively inhibiting Li dendrite, significantly improves safety, coulombic efficiency and the cycle performance of lithium metal battery.
Description
Technical field
The utility model is bright to be related to field of lithium, and in particular to a kind of novel lithium metal battery.
Background technique
Lithium battery is widely used in electric car and portable electronic device.However, present commercialized lithium-ion electric
Pond has been difficult to meet the needs of today's society is growing to battery energy density due to the limitation of itself electrode material.
Lithium metal battery is due to its high theoretical specific capacity (3860mAh g-1), it is ideal next-generation lithium battery.So
And the cyclical stability difference and safety problem of lithium metal battery, limit the application of lithium metal battery.Lead to these problems
Basic reason is the growth of non-uniform lithium deposition and Li dendrite.During duplicate charge and discharge cycles, lithium metal table
Face can generate Li dendrite, and the growth of Li dendrite can pierce through membrane for polymer, lead to battery short circuit, generate security risk.Except this it
Outside, lithium an- ode can also generate volume expansion, increase inside battery stress, shorten battery life.
Electrolysis additive, artificial solid electrolyte interface film, solid electrolyte and close lithium carrier be made to solve
Above-mentioned problem.These modes can partially solve the above problems, but preparation process is cumbersome, and higher cost is unfavorable for
It commercially produces.
In addition to above-mentioned method of modifying, three-dimensional nickel skeleton is also used to inhibit the growth of Li dendrite, because its biggish compares table
Area can effectively reduce local current, inhibit lithium dendrite growth (Chi et.al., Prestoringlithium into
Stable 3D nick el foam host asdendrite-free lithium metal anode,
Adv.Funct.Mater.2017,27,1700348).In addition to this, the carrier that redox graphene is deposited used also as lithium,
Inhibit growth (Lin et.al., the Layered reduced graphene oxide with of Li dendrite
nanoscaleinterlayer gaps as a stable host for lithiummetal anodes)。
But above-mentioned carrier material is all that electronic conductor is more likely to be deposited on carrier surface when lithium ion deposits, it is difficult
To play the effect of three-dimensional carrier completely, thoroughly inhibit the growth of Li dendrite.
Utility model content
The utility model provides a kind of lithium metal battery, internal by having fitted closely on the collector of cathode pole piece
It is filled with the poly- melamine foamed plastic buffer layer of lithium metal obturator, effectively inhibits the growth of Li dendrite, significantly improves lithium gold
Belong to safety, coulombic efficiency and the cycle performance of battery.
Specific technical solution is as follows：
A kind of novel lithium metal battery, including cathode pole piece, anode pole piece and for the cathode pole piece and described to be isolated
The diaphragm of anode pole piece；
The cathode pole piece includes collector and the poly- melamine foamed plastic buffer layer that fits closely with the collector；
Filled with the lithium metal obturator to match with its three dimensional skeletal structure in the poly- melamine foamed plastic buffer layer；
The collector is fitted closely backwards to the side of poly- melamine foamed plastic buffer layer with the diaphragm.
The preparation of the cathode pole piece specifically uses following technique：
By certain thickness poly- melamine foamed plastic buffer layer fit closely on a current collector, with lithium metal be to electrode,
It is collectively disposed in electrolyte, is prepared under working current density by the method for electro-deposition.
The poly- melamine foamed plastic includes the skeleton structure of three-dimensional netted crosslinking and the skeleton by three-dimensional netted crosslinking
A large amount of foam chambers that structure surrounds have a large amount of nitrogen-containing group in chemical structure.
In above-mentioned deposition process, nitrogen-containing group and lithium ion in chemical structure generate interaction, huge
Combination energy under the action of, can effectively uniform lithium ion stream, realize steady lithium deposition, inhibit the growth of Li dendrite.It removes
Except this, the skeleton structure of three-dimensional cross-linked network can deposit for lithium provides carrier, inhibits volume expansion, alleviates inside battery
Stress.
Under external current effect, lithium ion moves to collection liquid surface, and obtains electronics from collection liquid surface, conversion
For lithium metal.Therefore, lithium metal gradually sinks from bottom to top since the contact surface of collector and poly- melamine foamed plastic buffer layer
Product buffers to be formed with poly- melamine foamed plastic until all foam chambers in poly- melamine foamed plastic buffer layer are filled up
The lithium metal obturator that three dimensional skeletal structure matches in layer.
Preferably, the poly- melamine foamed plastic buffer layer with a thickness of 150~250 μm.
Further preferably, the porosity of the poly- melamine foamed plastic buffer layer is 50~95%.
Preferably, the collector is selected from copper foil, nickel foil, aluminium foil, silver foil or goldleaf；Further preferably, the afflux
Body is selected from copper foil, with a thickness of 0.05~1mm.
It is found through experiment that using above-mentioned raw materials, the cathode pole piece obtained through above-mentioned electrodeposition technology obtains after assembled
Lithium ion metal battery has high coulombic efficiency and splendid safety and cycle life.
Preferably, the anode pole piece includes collector and positive-active component.
Further preferably：
The collector is selected from copper foil, nickel foil, aluminium foil, silver foil or goldleaf；The anode pole piece and cathode pole piece are used
Collector material, the selection of the two has independence, may be the same or different.
The positive-active group is selected from lithium titanate, cobalt acid lithium or LiFePO4.
Preferably, the lithium metal battery further includes electrolyte, the electrolyte, which is adsorbed in the diaphragm, forms electricity
Solve liquid layer.
Preferably, the lithium metal battery further includes the shell being made of anode cover and negative electrode casing.
Compared with prior art, the utility model has the following advantages that：
The utility model is used by fitting closely poly- melamine foamed plastic buffer layer on the collector of cathode pole piece
Electrodeposition technology gradually deposits from bottom to top on contact surface of the collector with poly- melamine foamed plastic buffer layer, until by poly- three
All foam chambers in poly cyanamid foamed buffer layer fill up lithium metal obturator.The structure of the cathode pole piece effectively inhibits lithium branch
Brilliant growth, significantly improves safety, coulombic efficiency and the cycle performance of lithium metal battery.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the lithium metal battery of the utility model：
Fig. 2 is that lithium metal deposits schematic diagram in lithium an- ode piece preparation process in embodiment；
Fig. 3 is the chemical property of the lithium metal battery of embodiment assembling；
Fig. 4 is the lithium metal battery of embodiment assembling after 20 electrical property loop tests, and the SEM of cathode pole piece schemes；
In figure, 1- anode cover, 2- anode pole piece, 3- diaphragm, poly- melamine foamed plastic of the 4- full of lithium metal obturator be slow
Rush layer, 5- collector, 6- negative electrode casing；
The three dimensional skeletal structure of the poly- melamine foamed plastic of 41-, 42- lithium metal obturator.
Specific embodiment
Embodiment below will more comprehensively describe the utility model.
Embodiment
The lithium metal battery of the utility model includes cathode pole piece, anode pole piece 2 and diaphragm 3.
Cathode pole piece includes collector, and material is copper foil, with a thickness of 0.2mm；The side of collector 5 be placed with a thickness of
200 μm, the poly- melamine foamed plastic buffer layer 4 that porosity is 85~95%, the poly- melamine foamed plastic buffer layer 4 and collector
5 fit closely；The other side of collector 5 is fitted closely away from the side of poly- melamine foamed plastic buffer layer 4 with diaphragm 3.
There are a large amount of foam chambers in poly- melamine foamed plastic buffer layer 4, electrodeposited technique, lithium metal is from collector 5 and gathers
The contact surface of melamine foamed plastic buffer layer 4 starts gradually to deposit from bottom to top, until will be in poly- melamine foamed plastic buffer layer 4
All foam chambers fill up, to be formed and the three dimensional skeletal structure of poly- melamine foamed plastic buffer layer cohesion melamine foamed plastic
The 41 lithium metal obturators 42 to match.
The preparation process of the cathode pole piece is：
The poly- melamine foamed plastic buffer layer 4 of 200 μ m-thicks is placed in copper foil current collector 5, with lithium metal be to electrode,
Electrolyte is 1,3-dioxolane (DOL)/glycol dimethyl ether (DME) of the bis- trifluoromethanesulfonimide lithiums (LiTFSI) of 1M
(1:1, volume ratio), in 1mA cm-2Working current density under deposit 20h, cathode pole piece is prepared, specifically deposits schematic diagram
As shown in Figure 2.
Anode pole piece 2 is using copper foil as collector, with lithium titanate (Li4Ti5O12) it is active component, by active component and conduction
It is coated on collector after agent, binder and solvent mixing, obtains anode pole piece.
The assembly technology of lithium metal battery is as follows：
Cathode pole piece is placed on negative electrode casing 6, electricity is added dropwise in the side of poly- melamine foamed plastic buffer layer 4 on cathode pole piece
Solve liquid (1M lithium hexafluoro phosphate (LiPF6) ethylene carbonate (EC) and diethyl carbonate (DEC) (1:1, volume ratio)), it places
PP/PE/PP diaphragm continues that electrolyte (1M lithium hexafluoro phosphate (LiPF is added dropwise6) ethylene carbonate (EC) and diethyl carbonate
(DEC)(1:1, volume ratio))；The electrolyte that diaphragm two sides are added dropwise, which can be adsorbed in diaphragm, forms electrolyte layer.It places again just
Pole pole piece 2 finally places anode cover 1, and is packaged in the glove box of argon gas protection.
The specific discharge capacity curve of the half-cell of compound lithium an- ode manufactured in the present embodiment and lithium titanate electrode assembling
(curve 1) recycles as shown in figure 3, under the conditions of 2C big multiplying power by 1000 times, and the discharge capacity measured is still able to maintain stabilization,
And the specific discharge capacity curve (curve 2) for the half-cell for using common lithium an- ode to assemble is under the same conditions, by 200 times
After circulation, discharge capacity generation significantly decays.
The assembling process of half-cell of common lithium an- ode assembling as a comparison is：
By lithium piece as on negative electrode casing, electrolyte (1M lithium hexafluoro phosphate (LiPF is added dropwise in lithium piece6) ethylene carbonate
(EC) and diethyl carbonate (DEC) (1:1, volume ratio)), PP/PE/PP diaphragm is placed, continues that electrolyte (1M hexafluorophosphoric acid is added dropwise
Lithium (LiPF6) ethylene carbonate (EC) and diethyl carbonate (DEC) (1:1, volume ratio))；The electrolyte that diaphragm two sides are added dropwise
It can be adsorbed in diaphragm and form electrolyte layer.Anode pole piece is placed again；Anode cover is finally placed, and in the gloves of argon gas protection
It is packaged in case.
The lithium metal battery of the present embodiment assembling is given in Fig. 4 after 20 electrical property loop tests, cathode pole piece
SEM figure, observation Fig. 4 it can be found that without Li dendrite generate.
Claims (8)
1. a kind of novel lithium metal battery, including cathode pole piece, anode pole piece and for be isolated the cathode pole piece and it is described just
The diaphragm of pole pole piece；
It is characterized in that：
The cathode pole piece includes collector and the poly- melamine foamed plastic buffer layer that fits closely with the collector；
Filled with the lithium metal obturator to match with its three dimensional skeletal structure in the poly- melamine foamed plastic buffer layer；
The collector is fitted closely backwards to the side of poly- melamine foamed plastic buffer layer with the diaphragm.
2. novel lithium metal battery according to claim 1, which is characterized in that the poly- melamine foamed plastic buffer layer
With a thickness of 150~250 μm.
3. novel lithium metal battery according to claim 1, which is characterized in that the poly- melamine foamed plastic buffer layer
Porosity is 50~95%.
4. novel lithium metal battery according to claim 1, which is characterized in that the collector is selected from copper foil, nickel foil, aluminium
Foil, silver foil or goldleaf.
5. novel lithium metal battery according to claim 4, which is characterized in that the collector is selected from copper foil, with a thickness of
0.05~1mm.
6. novel lithium metal battery according to claim 1, which is characterized in that the anode pole piece includes collector and just
Pole active component.
7. novel lithium metal battery according to claim 6, which is characterized in that the collector is selected from copper foil, nickel foil, aluminium
Foil, silver foil or goldleaf；
The positive-active group is selected from lithium titanate, cobalt acid lithium or LiFePO4.
8. novel lithium metal battery according to claim 1, which is characterized in that the lithium metal battery further includes electrolysis
Liquid, the electrolyte, which is adsorbed in the diaphragm, forms electrolyte layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820138451.5U CN208111570U (en) | 2018-01-27 | 2018-01-27 | A kind of novel lithium metal battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820138451.5U CN208111570U (en) | 2018-01-27 | 2018-01-27 | A kind of novel lithium metal battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020168764A1 (en) * | 2019-02-21 | 2020-08-27 | Ningde Amperex Technology Limited | Electrochemical device and electronic device |
| CN111613773A (en) * | 2020-04-21 | 2020-09-01 | 浙江锋锂新能源科技有限公司 | Composite of glass fiber with hierarchical structure and metallic lithium and preparation method thereof |
| CN114270596A (en) * | 2021-03-31 | 2022-04-01 | 宁德新能源科技有限公司 | Electronic device and charging method for electronic device |
| CN114628635A (en) * | 2022-04-28 | 2022-06-14 | 南京邮电大学 | Lithium metal battery cathode and manufacturing method thereof |
-
2018
- 2018-01-27 CN CN201820138451.5U patent/CN208111570U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020168764A1 (en) * | 2019-02-21 | 2020-08-27 | Ningde Amperex Technology Limited | Electrochemical device and electronic device |
| CN111613773A (en) * | 2020-04-21 | 2020-09-01 | 浙江锋锂新能源科技有限公司 | Composite of glass fiber with hierarchical structure and metallic lithium and preparation method thereof |
| CN111613773B (en) * | 2020-04-21 | 2022-06-14 | 浙江锋锂新能源科技有限公司 | Composite of glass fiber with hierarchical structure and metallic lithium and preparation method thereof |
| CN114270596A (en) * | 2021-03-31 | 2022-04-01 | 宁德新能源科技有限公司 | Electronic device and charging method for electronic device |
| CN114628635A (en) * | 2022-04-28 | 2022-06-14 | 南京邮电大学 | Lithium metal battery cathode and manufacturing method thereof |
| CN114628635B (en) * | 2022-04-28 | 2023-11-03 | 南京邮电大学 | Lithium metal battery negative electrode and manufacturing method thereof |
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