CN109411716A - Based lithium-ion battery positive plate and preparation method thereof and lithium ion battery - Google Patents
Based lithium-ion battery positive plate and preparation method thereof and lithium ion battery Download PDFInfo
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- CN109411716A CN109411716A CN201811087067.8A CN201811087067A CN109411716A CN 109411716 A CN109411716 A CN 109411716A CN 201811087067 A CN201811087067 A CN 201811087067A CN 109411716 A CN109411716 A CN 109411716A
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- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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Abstract
The invention belongs to battery technology fields, and in particular to a kind of based lithium-ion battery positive plate and preparation method thereof and lithium ion battery.The based lithium-ion battery positive plate includes the anode active material layer that collector and painting are located at the collection liquid surface, the anode active material layer includes positive electrode active materials, hygroscopic agent, conductive agent, binder, the positive electrode active materials include the first active material and the second active material, nickel content in first active material is less than the nickel content in second active material, and the specific surface area of first active material is less than the specific surface area of second active material, wherein, second active material includes nickel lithium than the polynary positive pole material more than or equal to 0.5.The mixing positive electrode of positive electrode active materials as the present invention has better storage capacity and chemical property, therefore the storage capacity of positive plate and the cycle performance of battery core can be improved.
Description
Technical field
The invention belongs to battery technology fields, and in particular to a kind of based lithium-ion battery positive plate and preparation method thereof and lithium from
Sub- battery.
Background technique
Lithium ion battery is widely used in hand with excellent properties such as its high voltage, high-energy density and long circulation lifes
Machine and Notebook Battery, power battery and energy-storage battery etc..Wherein, mobile phone and Notebook Battery are accounted for by lithium ion battery completely
According at all other kinds of battery is unable to reach the rigors of these portable intelligent devices.With lithium ion battery technology
Development, shared ratio is also increasing in power battery energy-storage battery, for current development trend, lithium-ion electric
Pond is in a rapid development stage, has a extensive future.
Existing mixing based lithium-ion battery positive plate is excessively high primarily directed to cost, energy density is relatively low and high-temperature behavior
With the deficiency of cycle performance, improved technical solution is provided；But the nickelic positive electrode in based lithium-ion battery positive plate makes
Lead to penalty with water suction easily occurs in the process, and the problem does not improve always；Therefore, the prior art has much room for improvement.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of the prior art, a kind of based lithium-ion battery positive plate and its system are provided
Preparation Method and lithium ion battery, it is intended to which the nickelic positive electrode solved in existing based lithium-ion battery positive plate is hygroscopic, to lead
The technical issues of causing penalty.
For achieving the above object, The technical solution adopted by the invention is as follows:
One aspect of the present invention provides a kind of based lithium-ion battery positive plate, including collector and painting are located at the collection liquid surface
Anode active material layer, the anode active material layer includes positive electrode active materials, hygroscopic agent, conductive agent, binder, described
Positive electrode active materials include the first active material and the second active material, and the nickel content in first active material is less than described
Nickel content in second active material, and the specific surface area of first active material is less than the ratio table of second active material
Area, wherein second active material includes nickel lithium than the polynary positive pole material more than or equal to 0.5.
In based lithium-ion battery positive plate provided by the invention, it is living that anode is formed by the first active material and the second active material
Property material, the nickel content in the first active material is less than the nickel content in the second active material, because in active material synthesis process
The oxidation of middle nickelous to nickelic is very difficult, inevitably generation and bivalent nickel ion similar in lithium ion radius, from
And cationic mixing is caused, so that the lithium ion of surface of active material, which is easy to be precipitated, reacts production alkalinity with Carbon Dioxide in Air
Substance absorbs water, and because the nickel content in the second active material is more, the alkaline matter that opposite first active material generates is more,
Water absorption reaction more easily occurs；And the specific surface area of first active material is less than the specific surface area of the second active material, when
When the specific surface area of higher second active material of nickel content is bigger, the more of hygroscopic agent energy selectivity is distributed in the second active matter
Matter surface has more hygroscopic agents to be attached to the higher active material surface of nickel content, in this way for the second active material,
Reach better moisture absorption using lesser amount of hygroscopic agent, the mixing positive electrode of such positive electrode active materials has better storage
Ability and chemical property are deposited, therefore the storage capacity of positive plate and the cycle performance of battery core can be improved.
Another aspect of the present invention provides a kind of preparation method of above-mentioned based lithium-ion battery positive plate, includes the following steps:
First active material, the second active material, conductive agent and binder are dissolved in solvent, positive slurry is obtained
Material；
On a current collector by anode sizing agent coating, it is dried.
In the preparation method of based lithium-ion battery positive plate provided by the invention, the second active material phase that Yin Yi is reacted with water
It is bigger to the specific surface area of the first active material, in a solvent due to hygroscopic agent, conductive agent and binder uniform dissolution, work as mixing
When slurry, it will proportional more hygroscopic agents are attached on the second active material of high-specific surface area so that it is nickelic just
The mixing positive electrode of pole material has better storage capacity and chemical property, the finally obtained lithium ion battery of the preparation method
The storage capacity of positive plate and the cycle performance of battery core can be improved in positive plate.
Finally, the present invention also provides a kind of lithium ion battery, including positive plate, the positive plate are above-mentioned lithium of the invention
Ion battery positive plate.
Lithium ion battery in the present invention is because containing the distinctive based lithium-ion battery positive plate of the present invention, therefore, it is possible to reduce
Lithium ion battery is influenced by moisture, and the lithium ion battery is made to have preferable high temperature circulation stability.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain
The present invention is not intended to limit the present invention.
On the one hand, the embodiment of the invention provides a kind of based lithium-ion battery positive plate, including collector and painting be located at it is described
The anode active material layer of collection liquid surface, the anode active material layer include positive electrode active materials, hygroscopic agent, conductive agent,
Binder, the positive electrode active materials include the first active material and the second active material, the nickel in first active material
Content is less than the nickel content in second active material, and the specific surface area of first active material is less than described second and lives
Property substance specific surface area, wherein second active material include nickel lithium than be greater than or equal to 0.5 polynary positive pole material.
In based lithium-ion battery positive plate provided in an embodiment of the present invention, it is made of the first active material and the second active material
Positive electrode active materials, the nickel content in the first active material is less than the nickel content in the second active material, because closing in active material
Oxidation at nickelous in the process to nickelic is very difficult, inevitably generate with lithium ion radius similar in nickelous from
Son, so that cationic mixing is caused, so that the lithium ion of surface of active material, which is easy to be precipitated, reacts life with Carbon Dioxide in Air
Alkaline matter is produced to absorb water, because the nickel content in the second active material is more, the basic species of opposite first active material generation
Matter is more, it is easier to water absorption reaction occur；And the specific surface area of first active material is less than the ratio table of the second active material
Area, when the specific surface area of higher second active material of nickel content is bigger, hygroscopic agent can the more of selectivity be distributed in the
Two active material surfaces have more hygroscopic agents to be attached to the higher active material surface of nickel content, in this way to the second activity
For substance, reach better moisture absorption using lesser amount of hygroscopic agent, the mixed electrode of such positive electrode active materials has
Better storage capacity and chemical property, therefore the storage capacity of positive plate and the cycle performance of battery core can be improved.
Second active material of the embodiment of the present invention is nickel lithium than the polynary positive pole material more than or equal to 0.5.It can manage
Xie Wei, it is nickelic positive electrode that nickel lithium ratio, which is greater than or equal to 0.5, such as can be in nickel cobalt manganese (NCM) ternary material
NCM622, NCM811 etc..I.e. in an embodiment of the present invention, by mixing first active material and the second active material,
To solve the problems, such as that the i.e. nickelic positive electrode of the second active material is hygroscopic.
Further, in based lithium-ion battery positive plate provided in an embodiment of the present invention, the ratio of first active material
Surface area is 0.2~3m2/g；The specific surface area of second active material is 0.3~5m2/g.It is tied within the scope of above-mentioned specific area
It closes hygroscopic agent and reaches better moisture absorption.In order to make hygroscopic agent more be incorporated in the higher second active material table of nickel content
Face, the specific surface area of first active material are less than the specific surface area of second active material.Such as when the first active material
Specific surface area be 0.2m2/ g, the specific surface area of the second active material can be 0.3~5m2/g；When the ratio of the first active material
Surface area is 1m2/ g, the specific surface area of the second active material can be 2~5m2/g；When the specific surface area of the first active material is
2m2/ g, the specific surface area of the second active material can be 3~5m2/g。
Further, in based lithium-ion battery positive plate provided in an embodiment of the present invention, first active material includes
LiMn2O4, cobalt acid lithium, LiFePO4 and nickel lithium are than at least one of the polynary positive pole material less than 0.5；Because the present invention is implemented
In example, the nickel content in the first active material is less than the nickel content in the second active material.Thus, it can be understood that the first activity
Nickel content in substance is 0, such as LiMn2O4, cobalt acid lithium, LiFePO4, it is understood that for the nickel content in the first active material
It is relatively very low, if nickel lithium is than the polynary positive pole material less than 0.5.And the second active material is nickel lithium than more than or equal to 0.5
Polynary positive pole material, i.e., nickelic positive electrode.
Further, in based lithium-ion battery positive plate provided in an embodiment of the present invention, first active material and
The mass ratio of two active materials is (1-9): (9-1).Collocation positive electrode active materials are carried out in the proportional region, it can avoid
The nickelic hygroscopic problem of positive electrode, and the storage capacity and chemical property of positive plate can be improved.
Further, in based lithium-ion battery positive plate provided in an embodiment of the present invention, the conductive agent includes carbon nanometer
At least one of pipe, acetylene black, Ketjen black and carbon black；The binder includes Kynoar (PVDF), carboxymethyl cellulose
At least one of element and butadiene-styrene rubber, two kinds of active materials can be preferably combined together by above-mentioned binder.
Further, in based lithium-ion battery positive plate provided in an embodiment of the present invention, the hygroscopic agent includes organic acid
At least one of with acylate.Hygroscopic agent is organic hygroscopic agent, and preferable example is organic acid, acylate and can form water
The organic material of object is closed, most preferably a kind of organic acid and a kind of salt that can form hydrate, preferably oxalic acid, citric acid or toluene
At least one of sulfonic acid.Further, the relative molecular mass of the hygroscopic agent is 46-500.
On the other hand, the embodiment of the present invention provides a kind of preparation method of above-mentioned based lithium-ion battery positive plate, including as follows
Step:
S01: first active material, the second active material, conductive agent and binder are dissolved in solvent, anode is obtained
Slurry；
S02: it on a current collector by anode sizing agent coating, is dried.
In the preparation method of based lithium-ion battery positive plate provided in an embodiment of the present invention, Yin Yi reacted with water second activity
Substance is bigger with respect to the specific surface area of the first active material, in a solvent due to hygroscopic agent, conductive agent and binder uniform dissolution,
When mixed slurry, it will proportional more hygroscopic agents are attached on the second active material of high-specific surface area, so that
The mixing positive electrode of nickelic positive electrode has better storage capacity and chemical property, the finally obtained lithium of the preparation method from
The storage capacity of positive plate and the cycle performance of battery core can be improved in sub- battery anode slice.
Further, in above-mentioned steps S01, finally obtained anode sizing agent contains following parts by weight of component: first is living
Property substance: 9-90 parts；Second active material: 9-90 parts；Hygroscopic agent: 2-5 parts；Binder: 2-5 parts；Conductive agent: 3-5 parts；It is molten
Agent: 40-50 parts.Because after positive plate is made, solvent can volatilize, the positive living of collection liquid surface is located at so applying in final positive plate
Property material layer contains: the first active material: 9-90 parts；Second active material: 9-90 parts；Hygroscopic agent: 2-5 parts；Binder: 2-5
Part；Conductive agent: 3-5 parts.Solvent in the step is preferably N-Methyl pyrrolidone (NMP).Further, anode sizing agent uses
Emulsifying homogeneous high speed dispersion is at uniform and stable slurry.Since binder and hygroscopic agent can be effectively dissolved in organic solvent,
So they, which can form uniform solution, is attached to surface of positive electrode active material, hygroscopic agent can be dispersed in bonding well after solidification
It combines in agent in surface of positive electrode active material.
Further, in above-mentioned steps S02, the anode sizing agent that viscosity is 3000Pas-6000Pas is coated in
On collector, it is dried.It is 3000Pas-6000Pas by adjusting viscosity, the anode sizing agent in the range of viscosities is not
It is easily settled and be easy to apply on collector.Specifically, with aluminium foil as collector, the anode that lithium ion battery is mixed to prepare
Slurry coats on a current collector, close with collector bonding after drying, and required positive plate is made later using roll-in.
The positive plate prepared and diaphragm, negative electrode tab, electrolyte are assembled into lithium ion battery.
Finally, the embodiment of the present invention also provides a kind of lithium ion battery, including positive plate, the positive plate is that the present invention is real
Apply the above-mentioned based lithium-ion battery positive plate of example.Specifically, which includes the positive plate of the embodiment of the present invention, negative electrode tab
And electrolyte.
Lithium ion battery in the embodiment of the present invention implements distinctive based lithium-ion battery positive plate because containing the present invention, because
This, it is possible to reduce lithium ion battery is influenced by moisture, and the lithium ion battery is made to have preferable high temperature circulation stability.
The present invention successively carried out test of many times, and it is further detailed as reference pair invention progress now to lift A partial experiment result
Thin description, is described in detail combined with specific embodiments below.
Embodiment 1-1:
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.25m2/ g, NCM622 are the second active material,
Specific surface area is 0.5m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally plus
Entering a certain amount of NMP to adjust viscosity is 3000Pas-6000Pas, and the anode sizing agent mixed is coated uniformly on aluminium foil, is coated
Thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Embodiment 1-2:
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.25m2/ g, NCM622 are the second active material,
Specific surface area is 0.35m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally plus
Entering a certain amount of NMP to adjust viscosity is 3000Pas-6000Pas, and the anode sizing agent mixed is coated uniformly on aluminium foil, is coated
Thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 1-1
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.4m2/ g, NCM622 are the second active material,
Specific surface area is 0.3m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally plus
Entering a certain amount of NMP to adjust viscosity is 3000Pas-6000Pas, and the anode sizing agent mixed is coated uniformly on aluminium foil, is coated
Thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 1-2
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.4m2/ g, NCM622 are the second active material,
Specific surface area is 0.25m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally plus
Entering a certain amount of NMP to adjust viscosity is 3000Pas-6000Pas, and the anode sizing agent mixed is coated uniformly on aluminium foil, is coated
Thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Embodiment 2-1:
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.25m2/ g, NCM622 are the second active material,
Specific surface area is 0.5m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Embodiment 2-2:
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.25m2/ g, NCM622 are the second active material,
Specific surface area is 0.35m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 2-1
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.4m2/ g, NCM622 are the second active material,
Specific surface area is 0.3m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally plus
Entering a certain amount of NMP to adjust viscosity is 3000Pas-6000Pas, and the anode sizing agent mixed is coated uniformly on aluminium foil, is coated
Thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 2-2
A kind of preparation method of positive plate, includes the following steps:
Select LiMn2O4 for the first active material first, specific surface area 0.4m2/ g, NCM622 are the second active material,
Specific surface area is 0.25m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM622 after mixing, LiMn2O4 is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Embodiment 3-1:
A kind of preparation method of positive plate, includes the following steps:
Select cobalt acid lithium for the first active material first, specific surface area 0.25m2/ g, NCM811 are the second active material,
Specific surface area is 0.5m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM822 after mixing, cobalt acid lithium is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Embodiment 3-2:
A kind of preparation method of positive plate, includes the following steps:
Select cobalt acid lithium for the first active material first, specific surface area 0.25m2/ g, NCM811 are the second active material,
Specific surface area is 0.35m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM811 after mixing, cobalt acid lithium is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 3-1
A kind of preparation method of positive plate, includes the following steps:
Select cobalt acid lithium for the first active material first, specific surface area 0.4m2/ g, NCM811 are the second active material,
Specific surface area is 0.3m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM811 after mixing, cobalt acid lithium is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Comparative example 3-2
A kind of preparation method of positive plate, includes the following steps:
Select cobalt acid lithium for the first active material first, specific surface area 0.4m2/ g, NCM811 are the second active material,
Specific surface area is 0.25m2/g；
Anode sizing agent is prepared by following parts by weight:
PVDF, carbon nanotube and oxalic acid are added into NCM811 after mixing, cobalt acid lithium is sufficiently stirred, finally
It is 3000Pas-6000Pas that a certain amount of NMP, which is added, and adjusts viscosity, and the anode sizing agent mixed is coated uniformly on aluminium foil, is applied
Covering thickness in monolayer is 40 μm, bilayer coating.Roll pressing is carried out after drying into required positive plate.
Positive plate and cathode, diaphragm, electrolyte that above-described embodiment and comparative example are prepared are assembled into battery core, tested
Cycle performance of the battery core under 45 DEG C of states of environment temperature carries out charge-discharge test, the appearance of record test front and back using 1C electric current
Conservation rate is measured, data such as the following table 1:
Table 1
It can be seen that the specific surface area when the first active material and the second active material from the test data result in table 1
When than less than 1,45 DEG C of conservation rates after circulation conservation rate 300 weeks are higher, and be apparently higher than specific surface area than be greater than 1 scheme.
Illustrate when the specific surface area of the first active material is less than specific surface area with the second active material, big nickelic of specific surface area
Active material, which can contact, is integrated to more hygroscopic agents, thus ensure that the performance of nickelic active material, shadow after avoiding it from absorbing water
Its processing performance and high-temperature behavior are rung, reduce it is influenced by moisture, makes it have preferable high temperature circulation stability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of based lithium-ion battery positive plate is located at the anode active material layer of the collection liquid surface including collector and painting,
The anode active material layer includes positive electrode active materials, hygroscopic agent, conductive agent, binder, it is characterised in that: the anode is living
Property material include the first active material and the second active material, it is living that the nickel content in first active material is less than described second
Property substance in nickel content, and the specific surface area of first active material be less than second active material specific surface area,
Wherein, second active material is nickel lithium than the polynary positive pole material more than or equal to 0.5.
2. based lithium-ion battery positive plate as described in claim 1, which is characterized in that the specific surface area of first active material
For 0.2~3m2/g；And/or
The specific surface area of second active material is 0.3~5m2/g。
3. based lithium-ion battery positive plate as described in claim 1, which is characterized in that first active material includes mangaic acid
Lithium, cobalt acid lithium, LiFePO4 and nickel lithium are than at least one of the polynary positive pole material less than 0.5.
4. based lithium-ion battery positive plate as described in claim 1, which is characterized in that first active material and the second activity
The mass ratio of substance is (1-9): (9-1).
5. based lithium-ion battery positive plate as described in claim 1, which is characterized in that the conductive agent includes carbon nanotube, second
At least one of acetylene black, Ketjen black and carbon black；And/or
The binder includes at least one of Kynoar, carboxymethyl cellulose and butadiene-styrene rubber.
6. based lithium-ion battery positive plate as described in any one in claim 1-5, which is characterized in that the hygroscopic agent includes organic
At least one of acid and acylate.
7. based lithium-ion battery positive plate as claimed in claim 6, which is characterized in that the hygroscopic agent includes oxalic acid, citric acid
At least one of with toluenesulfonic acid；And/or
The relative molecular mass of the hygroscopic agent is 46-500.
8. a kind of preparation method of based lithium-ion battery positive plate as described in any one in claim 1-5, which is characterized in that including
Following steps:
First active material, the second active material, hygroscopic agent, conductive agent and binder are dissolved in solvent, anode is obtained
Slurry；
On a current collector by anode sizing agent coating, it is dried.
9. preparation method as claimed in claim 8, which is characterized in that the anode for being 3000Pas-6000Pas by viscosity
Slurry coats on a current collector, is dried.
10. a kind of lithium ion battery, including positive plate, it is characterised in that: the positive plate is described in any one of claim 1-7
Based lithium-ion battery positive plate.
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| CN113675370A (en) * | 2021-09-01 | 2021-11-19 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
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Application publication date: 20190301 |