CN109728306A - A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery - Google Patents
A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery Download PDFInfo
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- CN109728306A CN109728306A CN201811413050.7A CN201811413050A CN109728306A CN 109728306 A CN109728306 A CN 109728306A CN 201811413050 A CN201811413050 A CN 201811413050A CN 109728306 A CN109728306 A CN 109728306A
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- negative electrode
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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
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Abstract
The invention belongs to technical field of lithium ion, more particularly to a kind of benefit lithium cathode sheet, including negative current collector, the first negative electrode slurry layer for being set to two surface of negative current collector, fit closely in the first negative electrode slurry layer surface lithium layers of foil and be set to the second negative electrode slurry layer on lithium layers of foil surface, the length of the lithium layers of foil is less than the length of the first negative electrode slurry layer and the second negative electrode slurry layer, and the width of the lithium layers of foil is less than the width of the first negative electrode slurry layer and the second negative electrode slurry layer.In addition, the lithium ion battery the present invention also provides a kind of preparation method for mending lithium cathode sheet and containing the benefit lithium cathode sheet.Compared with the prior art, the present invention realizes the effect for mend to negative electrode tab lithium, the first charge discharge efficiency and cycle performance of the battery containing the benefit lithium cathode sheet can be improved, one layer of second negative electrode slurry layer is also added again on the surface of lithium layers of foil simultaneously, it avoids lithium layers of foil exposed in air, reduces working condition requirement.
Description
Technical field
The invention belongs to technical field of lithium ion more particularly to a kind of benefit lithium cathode sheet and preparation method thereof, lithium from
Sub- battery.
Background technique
Lithium ion battery due to its operating voltage is high, self discharge is small, memory-less effect, it is environmentally friendly the features such as and it is extensive
Applied in various electronic equipments and electric energy-stored equipment.Lithium ion battery is mainly by anode, cathode, diaphragm and electrolyte group
At.When initial charge (chemical conversion), the lithium ion that anode takes off has a certain amount of lithium damage due to forming SEI film etc. in cathode
It loses, so as to cause the reduction of battery first charge discharge efficiency, influences battery capacity and energy density.
In order to improve battery first charge discharge efficiency, industry generallys use the mode for mending lithium.The method for mending lithium mainly has anode to mend lithium
Lithium is mended with cathode.Anode mends lithium and refers to that the Li in certain rich lithium compound of anode addition, initial charge in the compound is whole
Or part is deviate from, and is reached cathode and is supplemented cathode lithium source, and lose activity after the compound initial charge, it is no longer participate in subsequent
Electrochemical reaction.Anode benefit lithium is relatively easy, not high to battery production environmental requirement, but can leave in anode pole piece non-live
Property material, influence anode electric conductivity and battery energy density.Cathode mend lithium refer to directly lithium piece or lithium powder are added in it is negative
Pole, benefit lithium is high-efficient, but very harsh to the requirement of battery production operating environment, needs to dry and have argon gas protection.Because golden
It is high to belong to lithium activity, is easily reacted with moisture, oxygen and the nitrogen in air, is easy to happen on fire or explosion.
Summary of the invention
It is an object of the present invention to: in view of the deficiencies of the prior art, and a kind of benefit lithium cathode sheet is provided,
To achieve the goals above, the invention adopts the following technical scheme:
A kind of benefit lithium cathode sheet, including negative current collector, the first negative electrode slurry layer for being set to two surface of negative current collector,
Fit closely in the first negative electrode slurry layer surface lithium layers of foil and be set to lithium layers of foil surface the second cathode slurry
The bed of material, the length of the lithium layers of foil are less than the length of the first negative electrode slurry layer and the second negative electrode slurry layer, the lithium
The width of layers of foil is less than the width of the first negative electrode slurry layer and the second negative electrode slurry layer.
It should be noted that the length of lithium layers of foil is arranged to compare the length of the first negative electrode slurry layer and the second negative electrode slurry
Small, the width of lithium layers of foil is arranged smaller than the width of the first negative electrode slurry layer and the second negative electrode slurry, is for ensuring lithium foil
Layer is not exposed in air.
As a kind of improvement of the present invention for mending lithium cathode sheet, the lithium layers of foil is vesicular texture, and aperture is
0.05 ~ 0.5mm, pitch of holes are 0.5 ~ 2mm.Lithium layers of foil is set as cellular, applies certain pressure to it in preparation process, can make
Lithium foil fitted closely with cathode membrane, while be conducive to the later period electrolyte infiltration.
As a kind of improvement of the present invention for mending lithium cathode sheet, the first negative electrode slurry layer is living including the first cathode
Property material, the first cathode conductive agent and the first negative electrode binder, first negative electrode active material be graphite, graphite and Si it is mixed
The mixture of object or graphite and SiOx is closed, first negative electrode binder is water-based binder or oil system binder.Due to first
Negative electrode slurry layer is coated on collection liquid surface, and before lithium layers of foil is sticked up, the first negative electrode slurry layer is dry
It is molding, it therefore, will not react with lithium foil the first negative electrode binder is water-based binder, therefore the first cathode bonds
Agent pole is also possible to oil system binder either water-based binder.
As a kind of improvement of the present invention for mending lithium cathode sheet, the second negative electrode slurry layer is living including the second cathode
Property material, the second cathode conductive agent and the second negative electrode binder, second negative electrode active material be graphite, graphite and Si it is mixed
The mixture of object or graphite and SiOx is closed, second negative electrode binder is oil system binder.Since the second negative electrode slurry layer is
Be coated on above lithium foil, easily with water vigorous reaction occurs for lithium foil, so the second negative electrode binder can only be oil system binder and
It cannot be water-based binder.
As it is of the present invention mend lithium cathode sheet a kind of improvement, the negative current collector with a thickness of 6 ~ 15um.
As a kind of improvement of the present invention for mending lithium cathode sheet, the surface density of the first negative electrode slurry layer is 3 ~
8mg/cm2。
As it is of the present invention mend lithium cathode sheet a kind of improvement, the lithium layers of foil with a thickness of 5 ~ 10um.
As a kind of improvement of the present invention for mending lithium cathode sheet, the surface density of the second negative electrode slurry layer is 3 ~
8mg/cm2。
One of beneficial effects of the present invention are: the present invention adds one layer of lithium layers of foil on conventional negative electrode tab surface, realizes
The effect for mend to negative electrode tab lithium, can be improved the first charge discharge efficiency and cycle performance of the battery containing the negative electrode tab, simultaneously also
One layer of second negative electrode slurry layer is added again on the surface of lithium layers of foil, avoids lithium layers of foil exposed in air, is reduced working condition and is wanted
It asks.
The second object of the present invention is: providing a kind of preparation method for mending lithium cathode sheet, comprising the following steps:
Step 1 coats one layer of first negative electrode slurry layer on the two sides of negative current collector by way of coating；
Step 2, after the material that step 1 is obtained is sufficiently dry, under dry environment of the dew-point temperature less than -35 DEG C, the
One negative electrode slurry layer surface sticks one layer of lithium layers of foil, if the lithium layers of foil is made of the spaced small lithium foil of dry plate, it is ensured that point
The length for cutting rear lithium layers of foil is smaller than the length of the first negative electrode slurry layer and the second negative electrode slurry, and the width of lithium layers of foil is than the first cathode
The width of pulp layer and the second negative electrode slurry is small；
Step 3 is coated one layer of second negative electrode slurry on lithium foil surface under dry environment of the dew-point temperature less than -35 DEG C
Layer；
Step 4, the material that step 3 is obtained are cut, and the gap location between the small lithium foil of adjacent two panels is cut, and are obtained
To benefit lithium cathode sheet.
The two of beneficial effects of the present invention are: in preparation method of the invention in such a way that lithium layers of foil carries out mending lithium,
(dew point < -35 DEG C) occur it is achieved that not having lithium metal dust under conventional drying environment, do not need argon gas protection, right
Environmental requirement substantially reduces, and industry can be achieved.
The third object of the present invention is: providing a kind of lithium ion battery, including positive plate, negative electrode tab, is arranged at intervals at
Isolation film and electrolyte between the positive plate and negative electrode tab, it is characterised in that: the negative electrode tab is previously described benefit
Lithium cathode sheet, and the negative electrode tab is as made from the previously described preparation method for mending lithium cathode sheet.
The three of beneficial effects of the present invention are: the cathode of lithium ion battery of the invention mends lithium using lithium foil, significantly mentions
The high first charge discharge efficiency and cycle performance of lithium ion battery.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that lithium cathode sheet is mended after cutting in the present invention.
Fig. 2 is the structural schematic diagram that lithium cathode sheet is mended before not cutting in the present invention.
Wherein: 1- negative current collector, 2- the first negative electrode slurry layer, 3- lithium layers of foil, 4- the second negative electrode slurry layer, the small lithium of 5-
Foil.
Specific embodiment
With reference to embodiment and Figure of description, the present invention is described in further detail, but the present invention
Embodiment be not limited to this.
Embodiment 1
As shown in Figure 1, a kind of benefit lithium cathode sheet, including negative current collector 1, it is set to the first negative of 1 liang of surface of negative current collector
Pole pulp layer 2, fit closely in 2 surface of the first negative electrode slurry layer lithium layers of foil 3 and be set to the second negative of 3 surface of lithium layers of foil
Pole pulp layer 4, length of the length less than the first negative electrode slurry layer 2 and the second negative electrode slurry layer 4 of lithium layers of foil 3, the width of lithium layers of foil 3
Spend the width less than the first negative electrode slurry layer 2 and the second negative electrode slurry layer 4.
Further, lithium layers of foil 3 is vesicular texture, and aperture is 0.05 ~ 0.5mm, and pitch of holes is 0.5 ~ 2mm.
Further, the first negative electrode slurry layer 2 includes the first negative electrode active material, the first cathode conductive agent and the first cathode
Binder, the first negative electrode active material are the mixture of graphite, the mixture of graphite and Si or graphite and SiOx, and the first cathode is viscous
Tying agent is water-based binder or oil system binder.
Further, the second negative electrode slurry layer 4 includes the second negative electrode active material, the second cathode conductive agent and the second cathode
Binder, the second negative electrode active material are the mixture of graphite, the mixture of graphite and Si or graphite and SiOx, and the second cathode is viscous
Knot agent is oil system binder.
Further all, negative current collector 1 with a thickness of 6 ~ 15um, the surface density of the first negative electrode slurry layer 2 is 3 ~ 8mg/
cm2, lithium layers of foil 3 with a thickness of 5 ~ 10um, the surface density of the second negative electrode slurry layer 4 is 3 ~ 8mg/cm2。
Embodiment 2
A kind of preparation method of the benefit lithium cathode sheet of embodiment 1, comprising the following steps:
Step 1 coats one layer of first negative electrode slurry layer 2 on the two sides of negative current collector 1 by way of coating；First is negative
The negative electrode active material of pole pulp layer 2 is the mixture of graphite, the mixture of graphite and Si or graphite and SiOx, the first cathode slurry
The bed of material 2 can be obtained by following two mode: (1) negative electrode active material, conductive carbon, SBR and CMC by a certain percentage added,
It using deionized water as solvent, stirs, obtains the slurry with certain viscosity and solid content；(2) by negative electrode active material
Material, conductive carbon, PVDF are added by a certain percentage, using NMP as solvent, are stirred, and are obtained with certain viscosity and are contained admittedly
The slurry of amount；
Step 2, after the material that step 1 is obtained is sufficiently dry, under dry environment of the dew-point temperature less than -35 DEG C, the
One layer of lithium layers of foil 3 is sticked on one negative electrode slurry layer, 2 surface, if lithium layers of foil 3 is made of the spaced small lithium foil 5 of dry plate, such as Fig. 2 institute
Show；
Step 3 is coated one layer of second cathode slurry on 3 surface of lithium layers of foil under dry environment of the dew-point temperature less than -35 DEG C
The bed of material 4；The negative electrode active material of second negative electrode slurry layer 4 is the mixing of graphite, the mixture of graphite and Si or graphite and SiOx
Object, the second negative electrode slurry layer 4, using NMP as solvent, are filled by adding negative electrode active material, conductive carbon, PVDF by a certain percentage
Divide and stirs evenly and obtain；
Step 4, the material that step 3 is obtained are cut, and the gap location between the small lithium foil 5 of adjacent two panels is cut,
It obtains mending lithium cathode sheet.
Embodiment 3
A kind of lithium ion battery, including positive plate, negative electrode tab, the isolation film being arranged at intervals between positive plate and negative electrode tab, with
And electrolyte, negative electrode tab be embodiment 1 benefit lithium cathode sheet, and negative electrode tab by embodiment 2 benefit lithium cathode sheet preparation method
It is obtained.Positive electrode active materials contained in positive plate can be cobalt acid lithium, LiMn2O4, lithium nickelate, LiFePO4, nickel cobalt mangaic acid
One of lithium, nickel cobalt lithium aluminate etc. are a variety of.Diaphragm and electrolyte are all made of commercial diaphragm and electrolyte, in dry environment
Under (dew point < -35 DEG C) be prepared.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, the invention is not limited to above-mentioned specific embodiment, all those skilled in the art exist
Made any conspicuous improvement, replacement or modification all belong to the scope of protection of the present invention on the basis of the present invention.This
Outside, although using some specific terms in this specification, these terms are merely for convenience of description, not to the present invention
Constitute any restrictions.
Claims (10)
1. a kind of benefit lithium cathode sheet, it is characterised in that: including negative current collector, be set to the of two surface of negative current collector
One negative electrode slurry layer, fit closely in the first negative electrode slurry layer surface lithium layers of foil and be set to lithium layers of foil surface
The second negative electrode slurry layer, the length of the lithium layers of foil is less than the first negative electrode slurry layer and the second negative electrode slurry layer
Length, the width of the lithium layers of foil are less than the width of the first negative electrode slurry layer and the second negative electrode slurry layer.
2. benefit lithium cathode sheet according to claim 1, it is characterised in that: the lithium layers of foil is vesicular texture, and aperture is
0.05 ~ 0.5mm, pitch of holes are 0.5 ~ 2mm.
3. benefit lithium cathode sheet according to claim 1, it is characterised in that: the first negative electrode slurry layer includes the first cathode
Active material, the first cathode conductive agent and the first negative electrode binder, first negative electrode active material are graphite, graphite and Si
The mixture of mixture or graphite and SiOx, first negative electrode binder are water-based binder or oil system binder.
4. benefit lithium cathode sheet according to claim 1, it is characterised in that: the second negative electrode slurry layer includes the second cathode
Active material, the second cathode conductive agent and the second negative electrode binder, second negative electrode active material are graphite, graphite and Si
The mixture of mixture or graphite and SiOx, second negative electrode binder are oil system binder.
5. benefit lithium cathode sheet according to claim 1, it is characterised in that: the negative current collector with a thickness of 6 ~ 15um.
6. benefit lithium cathode sheet according to claim 1, it is characterised in that: the surface density of the first negative electrode slurry layer be 3 ~
8mg/cm2。
7. benefit lithium cathode sheet according to claim 1, it is characterised in that: the lithium layers of foil with a thickness of 5 ~ 10um.
8. benefit lithium cathode sheet according to claim 1, it is characterised in that: the surface density of the second negative electrode slurry layer be 3 ~
8mg/cm2。
9. a kind of described in any item preparation methods for mending lithium cathode sheet of claim 1 ~ 8, which is characterized in that including following step
It is rapid:
Step 1 coats one layer of first negative electrode slurry layer on the two sides of negative current collector by way of coating；
Step 2, after the material that step 1 is obtained is sufficiently dry, under dry environment of the dew-point temperature less than -35 DEG C, the
One negative electrode slurry layer surface sticks one layer of lithium layers of foil, if the lithium layers of foil is made of the spaced small lithium foil of dry plate；
Step 3 is coated one layer of second negative electrode slurry on lithium foil surface under dry environment of the dew-point temperature less than -35 DEG C
Layer；
Step 4, the material that step 3 is obtained are cut, and the gap location between the small lithium foil of adjacent two panels is cut, and are obtained
To benefit lithium cathode sheet.
10. a kind of lithium ion battery, including positive plate, negative electrode tab, be arranged at intervals between the positive plate and negative electrode tab every
From film and electrolyte, it is characterised in that: the negative electrode tab is the described in any item benefit lithium cathode sheets of claim 1 ~ 8, and institute
Negative electrode tab is stated as made from the preparation method as claimed in claim 9 for mending lithium cathode sheet.
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| CN201811413050.7A CN109728306A (en) | 2018-11-23 | 2018-11-23 | A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery |
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| CN201811413050.7A CN109728306A (en) | 2018-11-23 | 2018-11-23 | A kind of benefit lithium cathode sheet and preparation method thereof, lithium ion battery |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212152A (en) * | 2019-05-28 | 2019-09-06 | 合肥国轩高科动力能源有限公司 | A kind of roll-to-roll prelithiation method and device of electrodes of lithium-ion batteries |
| CN110676427A (en) * | 2019-09-30 | 2020-01-10 | 东莞力朗电池科技有限公司 | Lithium ion battery cathode material lithium supplementing method and battery preparation method |
| WO2021023010A1 (en) * | 2019-08-02 | 2021-02-11 | 宁德时代新能源科技股份有限公司 | Splicedly formed lithium strip, preparation method therefor, and negative pole, cell, lithium ion battery, battery module, battery pack and apparatus related thereto |
| CN112909219A (en) * | 2021-01-20 | 2021-06-04 | 珠海冠宇电池股份有限公司 | Electrode assembly and lithium ion battery |
| CN112952036A (en) * | 2021-03-30 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Pre-lithiation negative plate, manufacturing process thereof and lithium ion battery |
| CN113690400A (en) * | 2021-08-20 | 2021-11-23 | 蜂巢能源科技有限公司 | Pole piece lithium supplementing method and pole piece lithium supplementing device |
| CN113823760A (en) * | 2020-06-18 | 2021-12-21 | 天津中能锂业有限公司 | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery |
| CN114054306A (en) * | 2020-08-03 | 2022-02-18 | 天津中能锂业有限公司 | Microporous lithium foil production method and device |
| CN114373883A (en) * | 2020-10-15 | 2022-04-19 | 通用汽车环球科技运作有限责任公司 | Self-lithiated battery cell and prelithiation method thereof |
| CN114583143A (en) * | 2022-03-09 | 2022-06-03 | 湖北亿纬动力有限公司 | Negative electrode lithium-supplementing lithium tape and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212152A (en) * | 2019-05-28 | 2019-09-06 | 合肥国轩高科动力能源有限公司 | A kind of roll-to-roll prelithiation method and device of electrodes of lithium-ion batteries |
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| CN113823760A (en) * | 2020-06-18 | 2021-12-21 | 天津中能锂业有限公司 | Ultrathin lithium strip prefabricated member, composite negative electrode, preparation method of composite negative electrode and battery |
| CN114054306A (en) * | 2020-08-03 | 2022-02-18 | 天津中能锂业有限公司 | Microporous lithium foil production method and device |
| CN114373883A (en) * | 2020-10-15 | 2022-04-19 | 通用汽车环球科技运作有限责任公司 | Self-lithiated battery cell and prelithiation method thereof |
| CN112909219A (en) * | 2021-01-20 | 2021-06-04 | 珠海冠宇电池股份有限公司 | Electrode assembly and lithium ion battery |
| CN112952036A (en) * | 2021-03-30 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Pre-lithiation negative plate, manufacturing process thereof and lithium ion battery |
| CN113690400A (en) * | 2021-08-20 | 2021-11-23 | 蜂巢能源科技有限公司 | Pole piece lithium supplementing method and pole piece lithium supplementing device |
| CN114583143A (en) * | 2022-03-09 | 2022-06-03 | 湖北亿纬动力有限公司 | Negative electrode lithium-supplementing lithium tape and preparation method and application thereof |
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Application publication date: 20190507 |