CN113130910A - Positive pole piece of lithium ion battery - Google Patents

Positive pole piece of lithium ion battery Download PDF

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Publication number
CN113130910A
CN113130910A CN201911390596.XA CN201911390596A CN113130910A CN 113130910 A CN113130910 A CN 113130910A CN 201911390596 A CN201911390596 A CN 201911390596A CN 113130910 A CN113130910 A CN 113130910A
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CN
China
Prior art keywords
coating
lithium
current collector
nickel cobalt
ion battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911390596.XA
Other languages
Chinese (zh)
Inventor
崔日俊
李国敏
胡亚夫
刘小龙
李虹
王松建
高鹏程
余传平
曾意
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Gelinde Energy Co ltd
Original Assignee
Jiangxi Gelinde Energy Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangxi Gelinde Energy Co ltd filed Critical Jiangxi Gelinde Energy Co ltd
Priority to CN201911390596.XA priority Critical patent/CN113130910A/en
Publication of CN113130910A publication Critical patent/CN113130910A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a lithium ion battery positive pole piece which comprises a positive current collector and a coating coated on the surface of the current collector, wherein the coating is divided into two layers, the coating close to the current collector layer is a nickel cobalt lithium manganate coating, and the coating far away from the current collector layer is a nickel cobalt lithium manganate doped lithium manganate coating. According to the invention, the upper ternary lithium nickel cobalt manganese oxide coating and the lithium nickel cobalt manganese oxide-doped lithium manganese oxide coating are simultaneously coated, so that the bonding effect between the coatings is improved, the integral electronic conductivity of the pole piece material is ensured, the compacted density of the pole piece is also improved, the cost is reduced, and the energy density required by a lithium ion battery can be met.

Description

Positive pole piece of lithium ion battery
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive pole piece of a lithium ion battery.
Background
The lithium ion battery has been widely used in the 3C consumer market and the field of new energy vehicles due to its advantages of high energy density and output voltage, long service life, no memory effect, green environmental protection, etc.
At present, in a lithium ion battery manufacturing process, a single-layer coating is adopted to coat a required active material on a current collector, but with requirements on energy density and safety performance, the coating thickness of a pole piece is gradually increased, and the compaction density is increased. In particular, in consumer lithium ion batteries, most companies have begun to use a ternary lithium nickel cobalt manganese oxide doped lithium manganese oxide system due to cost limitations. However, the lithium manganate doped with lithium manganate has obvious disadvantages that the compacted density and the gram capacity of lithium manganate are low, the capacity of the whole chemical system is reduced after doping, the energy density of a battery is also reduced, and the pursuit of the energy density at the present stage is difficult to meet. Therefore, a breakthrough must be made in the technology of the ternary lithium manganese oxide doped battery, which not only reduces the cost, but also satisfies the requirement of energy density.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a lithium ion battery positive pole piece, aiming at improving the compaction density and the capacity of a ternary lithium nickel cobalt manganese oxide doped lithium manganese oxide system, reducing the production cost and meeting the energy density required by a lithium ion battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, the coating divide into two-layer, the coating that is close to the mass flow body is nickel cobalt lithium manganate coating, the coating of keeping away from the mass flow body is nickel cobalt lithium manganate doping coating.
The coating close to the current collector contains a nickel cobalt lithium manganate positive electrode active substance, a conductive agent and a bonding agent, and the weight ratio of dry powder is 92-97%: 1 to 4% and 1 to 3%. Further, the coating close to the current collector contains a nickel cobalt lithium manganate positive electrode active substance, a conductive agent and a binder, and the weight ratio of dry powder is 94-97%: 1-3%: 1 to 2 percent.
The coating far away from the current collector contains active materials of nickel cobalt lithium manganate and lithium manganate positive electrodes, a conductive agent and a bonding agent, and the weight ratio of dry powder is 95-98%: 0.5-2%: 1 to 3 percent. Further, the coating far away from the current collector contains active materials of nickel cobalt lithium manganate and a lithium manganate positive electrode, a conductive agent and a bonding agent, and the weight ratio of dry powder is 95-98%: 0.5-1.5%: 1 to 2 percent.
The weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 20-80%: 80-20%. Further, the weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 50-80%: 50-20%.
The coating thickness range close to the current collector is 50-100 mu m. Further, the thickness of the coating close to the current collector ranges from 70 to 100 micrometers.
The coating thickness range far away from the current collector is 20-70 mu m. Further, the coating thickness range far away from the current collector is 20-60 mu m.
The two layers of coatings are coated on one side of the current collector at the same time, and then the other side is coated according to the mode.
The invention has the beneficial effects that:
(1) according to the invention, the effect of simultaneously coating the upper ternary lithium nickel cobalt manganese oxide coating and the lithium nickel cobalt manganese oxide-doped lithium nickel cobalt manganese oxide coating is stronger, the separation phenomenon between the coatings can not occur, the integral electronic conductivity of the pole piece material can be ensured, and the production efficiency can be improved;
(2) the ternary lithium nickel cobalt manganese oxide coating can effectively improve the compacted density of the pole piece, and the lithium nickel cobalt manganese oxide doped lithium manganese oxide coating can obviously reduce the cost due to the addition of lithium manganese oxide;
(3) the positive pole piece can improve the production efficiency, reduce the production cost and meet the energy density required by the lithium ion battery.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and the description in this section is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
the embodiment is a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, the coating divide into two-layerly, the coating that is close to the mass flow body layer is the lithium nickel cobalt manganese oxide coating, the coating that is far away from the mass flow body layer is lithium nickel cobalt manganese oxide lithium-doped coating. Wherein, the weight ratio of the nickel cobalt lithium manganate positive active material, the conductive agent and the adhesive close to the coating of the current collector is 97%: 1.5%: 1.5 percent; the weight ratio of the nickel cobalt lithium manganate and the lithium manganate positive active material, the conductive agent and the adhesive of the coating far away from the current collector is 97.4%: 1%: 1.6 percent, wherein the weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 70 percent: 30 percent; and then coating on one side of the current collector at the same time, coating the other side of the current collector according to the above manner, and after drying and rolling, the thickness of the coating close to the current collector is 100 micrometers, and the thickness of the coating far away from the current collector is 50 micrometers.
Example 2:
the embodiment is a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, the coating divide into two-layerly, the coating that is close to the mass flow body layer is the lithium nickel cobalt manganese oxide coating, the coating that is far away from the mass flow body layer is lithium nickel cobalt manganese oxide lithium-doped coating. Wherein, the weight ratio of the nickel cobalt lithium manganate positive active material, the conductive agent and the adhesive close to the coating of the current collector is 97%: 1.5%: 1.5 percent; the weight ratio of the nickel cobalt lithium manganate and the lithium manganate positive active material, the conductive agent and the adhesive of the coating far away from the current collector is 97.4%: 1%: 1.6 percent, wherein the weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 60 percent: 40 percent; and then coating on one side of the current collector at the same time, coating the other side of the current collector according to the above manner, and after drying and rolling, the thickness of the coating close to the current collector is 100 micrometers, and the thickness of the coating far away from the current collector is 50 micrometers.
Example 3:
the embodiment is a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, the coating divide into two-layerly, the coating that is close to the mass flow body layer is the lithium nickel cobalt manganese oxide coating, the coating that is far away from the mass flow body layer is lithium nickel cobalt manganese oxide lithium-doped coating. Wherein, the weight ratio of the nickel cobalt lithium manganate positive active material, the conductive agent and the adhesive close to the coating of the current collector is 97%: 1.5%: 1.5 percent; the weight ratio of the nickel cobalt lithium manganate and the lithium manganate positive active material, the conductive agent and the adhesive of the coating far away from the current collector is 97.6%: 0.8%: 1.6 percent, wherein the weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 50 percent: 50 percent; and then coating the mixture on one side of a current collector, coating the other side of the current collector according to the above manner, and after drying and rolling, wherein the thickness of the coating close to the current collector is 110 micrometers, and the thickness of the coating far away from the current collector is 40 micrometers.
Example 4:
the embodiment is a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, the coating divide into two-layer from top to bottom, the coating that is close to the mass flow body layer is the lithium nickel cobalt manganese oxide coating, the coating that is far away from the mass flow body layer is lithium nickel cobalt manganese oxide lithium-doped coating. Wherein, the weight ratio of the nickel cobalt lithium manganate positive active material, the conductive agent and the adhesive close to the coating of the current collector is 97%: 1.5%: 1.5 percent; the weight ratio of the nickel cobalt lithium manganate and the lithium manganate positive active material, the conductive agent and the adhesive of the coating far away from the current collector is 97.4%: 1%: 1.6 percent, wherein the weight ratio of the nickel cobalt lithium manganate to the lithium manganate is 70 percent: 30 percent; and then coating on one side of the current collector at the same time, coating the other side of the current collector according to the above manner, and after drying and rolling, the thickness of the coating close to the current collector is 90 μm, and the thickness of the coating far away from the current collector is 60 μm.
Comparative example 1:
this comparative example is a lithium ion battery positive pole piece, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, and the coating on the mass flow body surface is nickel cobalt lithium manganate coating, and wherein the dry powder weight ratio of nickel cobalt lithium manganate positive pole active material, conducting agent and binder in this coating is 97%: 1.5%: 1.5%, and the thickness after rolling is 125 μm.
The invention provides a lithium ion battery anode piece, which effectively improves the compaction density and the capacity of a ternary lithium nickel cobalt manganese oxide doped lithium manganese oxide system, improves the production efficiency, reduces the production cost, and simultaneously can meet the energy density required by the current lithium ion battery.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (7)

1. The utility model provides a lithium ion battery positive pole piece, its characterized in that, positive pole piece includes the anodal mass flow body and coats the coating on the mass flow body surface, its characterized in that, the coating divide into two-layerly, the coating that is close to the mass flow body is nickel cobalt lithium manganate coating, the coating that is far away from the mass flow body is nickel cobalt lithium manganate mixed coating.
2. The positive electrode plate of the lithium ion battery of claim 1, wherein the coating layer close to the current collector comprises a nickel cobalt lithium manganate positive active material, a conductive agent and a binder, and the weight ratio of dry powder is 92-97%: 1 to 4% and 1 to 3%.
3. The positive electrode plate of the lithium ion battery of claim 1, wherein the coating layer far away from the current collector comprises lithium nickel cobalt manganese oxide and lithium manganese oxide positive active materials, a conductive agent and a binder, and the weight ratio of dry powder is 95-98%: 0.5-2%: 1 to 3 percent.
4. The positive electrode plate of the lithium ion battery of claim 3, wherein the weight ratio of nickel cobalt lithium manganate to lithium manganate is 20-80%: 80-20%.
5. The positive electrode plate of the lithium ion battery according to claim 1, wherein the thickness of the coating layer close to the current collector is 50-100 μm.
6. The positive electrode plate of the lithium ion battery according to claim 1, wherein the thickness of the coating layer away from the current collector is 20-70 μm.
7. The positive electrode plate of the lithium ion battery according to claim 1, wherein the two coating layers are simultaneously coated on one side of the current collector and then coated on the other side in the above manner.
CN201911390596.XA 2019-12-30 2019-12-30 Positive pole piece of lithium ion battery Pending CN113130910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911390596.XA CN113130910A (en) 2019-12-30 2019-12-30 Positive pole piece of lithium ion battery

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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
CN113130910A true CN113130910A (en) 2021-07-16

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103378352A (en) * 2012-04-25 2013-10-30 协鑫动力新材料（盐城）有限公司 Lithium ion battery positive pole piece and preparation method thereof
CN104600244A (en) * 2014-12-29 2015-05-06 惠州市恒泰科技有限公司 Multilayer positive plate, production method of positive plate and lithium ion battery
CN106169617A (en) * 2016-09-30 2016-11-30 上海空间电源研究所 A kind of space safety high power lithium ion accumulator
CN106654169A (en) * 2016-12-31 2017-05-10 山东精工电子科技有限公司 Positive electrode plate of lithium ion battery and preparation method for positive electrode plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103378352A (en) * 2012-04-25 2013-10-30 协鑫动力新材料（盐城）有限公司 Lithium ion battery positive pole piece and preparation method thereof
CN104600244A (en) * 2014-12-29 2015-05-06 惠州市恒泰科技有限公司 Multilayer positive plate, production method of positive plate and lithium ion battery
CN106169617A (en) * 2016-09-30 2016-11-30 上海空间电源研究所 A kind of space safety high power lithium ion accumulator
CN106654169A (en) * 2016-12-31 2017-05-10 山东精工电子科技有限公司 Positive electrode plate of lithium ion battery and preparation method for positive electrode plate

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Application publication date: 20210716