CN109860508A - Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode - Google Patents
Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode Download PDFInfo
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- CN109860508A CN109860508A CN201811539436.2A CN201811539436A CN109860508A CN 109860508 A CN109860508 A CN 109860508A CN 201811539436 A CN201811539436 A CN 201811539436A CN 109860508 A CN109860508 A CN 109860508A
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- negative electrode
- collector
- lithium ion
- ion 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
Present invention discloses a kind of preparation methods of lithium ion battery negative electrode comprising following steps: preparing collector, collector is woven into netted for metal fiber wire；Negative electrode slurry is prepared, negative electrode slurry includes silicon-based anode active material, binder and conductive agent；Coating, negative electrode slurry are coated on collector, form negative electrode material layer；It is dry；Present invention further teaches a kind of cathode pole piece and lithium ion batteries.Present invention, it is netted that collector is that metal fiber wire is woven into, in the charge and discharge process of battery, netted collector can provide the expansion space of silicon-based anode active material, the collector can disperse, mitigate the stress that negative electrode material generates due to volume change on its surface, prevent negative electrode material from cracking or obscission occurs, improve the utilization rate of negative electrode material, and then the decaying of capacity of lithium ion battery is reduced, improve the cycle performance of battery.
Description
Technical field
The present invention relates to technical field of lithium ion, are specifically related to a kind of preparation side of lithium ion battery negative electrode
Method, cathode pole piece and lithium ion battery.
Background technique
Lithium ion battery is mainly made of anode pole piece, cathode pole piece, diaphragm and electrolyte etc., and wherein cathode pole piece is to lithium
The performance of ion battery plays an important role.Traditional cathode pole piece generallys use following method and is made: by electrode activity material
On a current collector, simultaneously tabletting is dried in the coating of negative electrode slurry made of material, binder and conductive agent again later.Wherein, afflux
Body generally uses copper foil, and active material generally uses the carbon materials such as graphite, but the theoretical specific capacity of graphite is only 372mAh/g,
It is difficult to meet the growing battery capacity requirement in market, therefore, novel active material silicon is concerned, and silicon can occur with lithium
Reaction forms alloy, the theoretical specific capacity of silicon is 4200mAh/g, so as to meet high capacity, lithium ion battery with high specific power
Demand.However use silicon as active material the problem is that: in lithium ion battery charge and discharge process, active material will hair
The process of raw embedding and removing, at this point, greatly variation, silicon its volume in complete embedding lithium will occur for the volume of active material silicon
Expansion is up to 300%, and at this point, copper foil current collector can not reduce the stress as caused by active material volume change, cause
Active material gradually dusting, fall off so that capacity of lithium ion battery is lower, cycle performance is deteriorated.
Summary of the invention
In view of the deficiencies of the prior art, it is negative to provide a kind of preparation method of lithium ion battery negative electrode, one kind by the present invention
Pole pole piece and a kind of lithium ion battery.
A kind of preparation method of lithium ion battery negative electrode the following steps are included:
Collector is prepared, collector is woven into netted for metal fiber wire；
Negative electrode slurry is prepared, negative electrode slurry includes silicon-based anode active material, binder and conductive agent；
Coating, negative electrode slurry are coated on collector, form negative electrode material layer；
It is dry.
According to an embodiment of the present invention, further comprising the steps of after drying steps:
Prepare graphite slurry；
Secondary coating, graphite slurry are respectively coated on the outside of negative electrode material layer and collector, form two graphite linings；
Redrying.
According to an embodiment of the present invention, the thickness of collector is between 50-200um.
According to an embodiment of the present invention, the mesh of collector is between 300-1500 mesh.
According to an embodiment of the present invention, metal fiber wire is copper wire or nickel wire；The diameter of metal fiber wire is in 10-25um
Between.
According to an embodiment of the present invention, negative electrode slurry further includes graphite.
According to an embodiment of the present invention, silicon-based anode active material is silicon or silicon monoxide.
A kind of cathode pole piece, comprising:
Collector is woven into netted for metal fiber wire；And
Coated on the negative electrode material layer on the outside of collector；Negative electrode material layer is coated with by negative electrode slurry, negative electrode slurry packet
Include silicon-based anode active material, binder and conductive agent.
It according to an embodiment of the present invention, further include two graphite linings, two graphite linings are respectively coated in negative electrode material
The outside of layer and collector.
A kind of lithium ion battery, including anode pole piece, cathode pole piece, diaphragm and electrolyte；Cathode pole piece includes collector
And the negative electrode material layer on the outside of coated collector；Wherein, collector is woven into netted for metal fiber wire；Negative electrode material layer
It is coated with by negative electrode slurry, negative electrode slurry includes silicon-based anode active material, binder and conductive agent.
Compared with the existing technology: it is netted that collector is that metal fiber wire is woven into, in the charge and discharge process of battery, net
The collector of shape can provide the expansion space of silicon-based anode active material, which can disperse, mitigate negative electrode material because of body
Product changes in the stress that its surface generates, and prevents negative electrode material from cracking or obscission occurs, and improves negative electrode material
Utilization rate, and then the decaying of capacity of lithium ion battery is reduced, improve the cycle performance of battery.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is the flow chart of the preparation method of lithium ion battery negative electrode in embodiment 1；
Fig. 2 is the structural schematic diagram of cathode pole piece in embodiment 2.
Specific embodiment
Multiple embodiments of the invention will be disclosed with schema below, as clearly stated, the details in many practices
It will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit the present invention.Also
It is to say, in some embodiments of the invention, the details in these practices is non-essential.In addition, for the sake of simplifying schema,
Some known usual structures and component will be painted it in the drawings in simply illustrative mode.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only in the embodiment of the present invention
For explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if
When the particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, not especially censure
The meaning of order or cis-position, also non-to limit the present invention, the component described just for the sake of difference with same technique term
Or operation, it is not understood to indicate or imply its relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one of the features.In addition, each
Technical solution between a embodiment can be combined with each other, but must can be implemented as base with those of ordinary skill in the art
Plinth will be understood that the combination of this technical solution is not present when conflicting or cannot achieve when occurs in the combination of technical solution,
Also not the present invention claims protection scope within.
For that can further appreciate that the contents of the present invention, feature and effect, the following examples are hereby given, and cooperates attached drawing detailed
It is described as follows:
Embodiment 1
Referring to Fig.1, Fig. 1 is the flow chart of the preparation method of lithium ion battery negative electrode in embodiment 1.In the present embodiment
The preparation method of lithium ion battery negative electrode the following steps are included:
Collector is prepared, collector is woven into netted for metal fiber wire.The metallic fiber of use in the present embodiment
Silk is copper wire or nickel wire, and the diameter of metal fiber wire is between 10-25um, it is preferred that the diameter of metal fiber wire is 15um.Gold
Belong to fiber filament and be woven into reticulated collectors, braider specifically can be used when braiding and woven, the net of reticulated collectors is woven into
Mesh number amount is between 300-1500 mesh, and the thickness of reticulated collectors is between 50-200um, it is preferred that the mesh number of collector is
400 mesh, with a thickness of 100um.
Negative electrode slurry is prepared, negative electrode slurry includes silicon-based anode active material, binder and conductive agent, specifically, silicon substrate
Negative electrode active material can be used as silicon or silicon monoxide, and binder can be used butadiene-styrene rubber, conductive agent can be selected electrically conductive graphite or
Carbon nanotube.In the present embodiment, the parts by weight proportion of silicon-based anode active material, binder and conductive agent is 8-9: 0.3-
0.5: 0.5-2, the raw material that above-mentioned parts by weight match be can be prepared by into negative electrode slurry after evenly mixing.Preferably, cathode
Slurry further includes graphite, and the parts by weight proportion of graphite and silicon-based anode active material is 1-2: 8-9, graphite it is with higher
Electrochemical stability, through silicon-based anode active material in conjunction with graphite cathode active material, so that silicon is tied with the advantages of graphite
It closes, in the case where improving battery capacity, also there is the cycle characteristics more more stable than pure silicon in addition to this, can also be used certainly
Other carbon based negative electrodes materials except graphite, are not limited.
Coating, negative electrode slurry are coated on collector, form negative electrode material layer.The negative electrode slurry of above-mentioned preparation is passed through into coating
Machine is spread evenly across the surface of above-mentioned netted collector side, specifically, the mode that intaglio plate or extruding can be used is coated,
Finally make negative electrode slurry be spread evenly across the surface of collector, so can the surface of collector form negative electrode material layer.
It is dry, after the completion of above-mentioned coating, it can be prepared by cathode pole piece after dry and roll.
It is netted that collector is that metal fiber wire is woven into, and thickness is between 50-200um, in the charge and discharge of battery
In the process, when silicon-based anode active material expands, the mesh of collector can provide bearing space when expansion, so that afflux
Body can disperse, mitigate the stress that negative electrode material generates due to volume change on its surface, prevent negative electrode material from cracking
Or obscission, and then the utilization rate of negative electrode material is improved, to reduce the decaying of capacity of lithium ion battery, improve battery
Cycle performance.
Again referring to Fig.1, further, the preparation method of the lithium ion battery negative electrode in the present embodiment further includes following step
It is rapid:
Prepare graphite slurry.
Secondary coating, the graphite slurry of preparation are respectively coated on the outside of negative electrode material layer and the outside of collector, so that
The surface of the collector other side and the surface of negative electrode material layer are respectively formed two graphite linings.
Cathode pole piece is made in redrying.
Graphite it is electrochemically stable, in the charge and discharge process of battery, volume change is small, is coated with outside negative electrode material layer
A degree of inhibition blocking can be carried out to the expansion of negative electrode material layer by forming graphite linings, so that the expansion of negative electrode material layer is collecting
It is carried out in the mesh of fluid, so that battery obtains the cycle performance of more stable property.
Embodiment 2
It is the structural schematic diagram of cathode pole piece in embodiment 2 referring to Fig. 2, Fig. 2.Cathode pole piece in the present embodiment includes collection
Fluid 1, negative electrode material layer 2 and graphite linings 3.
Collector 1 be metal fiber wire be woven into it is netted, thereon have multiple mesh 11, mesh count is in 300-
Between 1500 mesh.Negative electrode material layer 2 is coated on the surface in 1 one outside of collector, specifically, negative electrode material layer 2 is by negative electrode slurry
It is coated with, specifically, negative electrode slurry includes silicon-based anode active material, binder and conductive agent, it is preferred that negative electrode slurry is also
Including graphite, negative electrode slurry is coated on 1 surface of collector and forms negative electrode material layer 2.The quantity of graphite linings 3 is two, two stones
The surface of outer surface and another outside of collector 1 in negative electrode material layer 2 is respectively coated in layer of ink 3, specifically, graphite linings 3 are by stone
Black slurry is coated with.
Embodiment 3
A kind of lithium ion battery is further disclosed in the present embodiment, lithium ion battery includes anode pole piece, cathode pole piece, diaphragm
And electrolyte, wherein cathode pole piece improves capacity and the charge and discharge of lithium ion battery using the cathode pole piece in above-described embodiment 2
The cycle performance of electricity.
The upper only embodiments of the present invention, are not intended to restrict the invention.For those skilled in the art
For, the invention may be variously modified and varied.All any modifications made in spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included within scope of the presently claimed invention.
Claims (10)
1. a kind of preparation method of lithium ion battery negative electrode, which comprises the following steps:
Collector is prepared, the collector is woven into netted for metal fiber wire；
Negative electrode slurry is prepared, the negative electrode slurry includes silicon-based anode active material, binder and conductive agent；
Coating, the negative electrode slurry are coated on the collector, form negative electrode material layer；
It is dry.
2. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that after drying steps
It is further comprising the steps of:
Prepare graphite slurry；
Secondary coating, the graphite slurry are respectively coated on the outside of the negative electrode material layer and the collector, form two
Graphite linings；
Redrying.
3. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that the collector
Thickness is between 50-200um.
4. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that the collector
Mesh is between 300-1500 mesh.
5. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that the metallic fiber
Silk is copper wire or nickel wire；The diameter of the metal fiber wire is between 10-25um.
6. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that the negative electrode slurry
It further include graphite.
7. the preparation method of lithium ion battery negative electrode according to claim 1, which is characterized in that the silicon-based anode
Active material is silicon or silicon monoxide.
8. a kind of cathode pole piece characterized by comprising
Collector is woven into netted for metal fiber wire；And
Coated on the negative electrode material layer on the outside of the collector；The negative electrode material layer is coated with by negative electrode slurry, cathode slurry
Material includes silicon-based anode active material, binder and conductive agent.
9. cathode pole piece according to claim 8, which is characterized in that it further includes two graphite linings, two graphite
The outside in the negative electrode material layer and collector is respectively coated in layer.
10. a kind of lithium ion battery, which is characterized in that including anode pole piece, cathode pole piece, diaphragm and electrolyte；The cathode
Pole piece includes the negative electrode material layer on the outside of collector and the coating collector；Wherein, the collector is metal fiber wire
What is be woven into is netted；The negative electrode material layer is coated with by negative electrode slurry, and negative electrode slurry includes silicon-based anode active material, glues
Tie agent and conductive agent.
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| CN201811539436.2A CN109860508A (en) | 2018-12-17 | 2018-12-17 | Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode |
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| CN201811539436.2A CN109860508A (en) | 2018-12-17 | 2018-12-17 | Preparation method, cathode pole piece and the lithium ion battery of lithium ion battery negative electrode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111916758A (en) * | 2020-07-28 | 2020-11-10 | 福建巨电新能源股份有限公司 | Modified three-dimensional braided net-shaped current collector, modification method thereof and lithium ion battery |
| CN113013379A (en) * | 2021-03-08 | 2021-06-22 | 昆山宝创新能源科技有限公司 | Negative pole piece, preparation method thereof and lithium ion battery |
| CN113972372A (en) * | 2021-09-26 | 2022-01-25 | 西安交通大学 | Metal graphite medium-temperature energy storage battery and preparation method thereof |
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| EP3358653A1 (en) * | 2015-09-30 | 2018-08-08 | NEC Energy Devices, Ltd. | Negative electrode for lithium ion secondary batteries and lithium ion secondary battery |
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Patent Citations (4)
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| CN103035925A (en) * | 2011-09-30 | 2013-04-10 | 天津市捷威动力工业有限公司 | Lithium-ion power battery, lithium-ion power battery current collecting body, negative electrode pole piece |
| EP3358653A1 (en) * | 2015-09-30 | 2018-08-08 | NEC Energy Devices, Ltd. | Negative electrode for lithium ion secondary batteries and lithium ion secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111916758A (en) * | 2020-07-28 | 2020-11-10 | 福建巨电新能源股份有限公司 | Modified three-dimensional braided net-shaped current collector, modification method thereof and lithium ion battery |
| CN111916758B (en) * | 2020-07-28 | 2022-05-31 | 福建巨电新能源股份有限公司 | Modified three-dimensional woven mesh-shaped current collector, modification method thereof and lithium ion battery |
| CN113013379A (en) * | 2021-03-08 | 2021-06-22 | 昆山宝创新能源科技有限公司 | Negative pole piece, preparation method thereof and lithium ion battery |
| CN113972372A (en) * | 2021-09-26 | 2022-01-25 | 西安交通大学 | Metal graphite medium-temperature energy storage battery and preparation method thereof |
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Application publication date: 20190607 |