CN108539156A - Lithium ion battery negative material, lithium ion battery and its device of driving and preparation method - Google Patents
Lithium ion battery negative material, lithium ion battery and its device of driving and preparation method Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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- 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
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H—ELECTRICITY
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- 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
- H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The present invention relates to field of lithium ion battery, specifically, providing the device and preparation method of a kind of lithium ion battery negative material, lithium ion battery and its driving.Lithium ion battery negative material provided by the invention includes Si-C composite material, negative electrode binder and cathode conductive agent.The content of negative electrode binder and cathode conductive agent is low in the lithium ion battery negative material, and while ensureing the electric conductivity and stable cycle performance of negative material, negative material also has energy density high, the good and at low cost advantage of stability.The above-mentioned ion cathode material lithium of lithium ion battery applications provided by the invention.The present invention provides the devices of lithium ion battery driving.The present invention provides the preparation method for preparing above-mentioned lithium ion battery, simple for process, has a wide range of application, the lithium ion battery being prepared has the advantages that safe and at low cost.
Description
Technical field
The present invention relates to field of lithium ion battery, in particular to a kind of lithium ion battery negative material, lithium-ion electric
The device and preparation method of pond and its driving.
Background technology
Lithium ion battery is a kind of secondary cell, i.e. rechargeable battery, it relies primarily on lithium ion between a positive electrode and a negative electrode
Movement carrys out work.In charge and discharge process, Li+Round-trip insertion and deintercalation between two electrodes：When charging, Li+It is de- from anode
It is embedding, it is embedded in cathode by electrolyte, cathode is in rich lithium state；It is then opposite when electric discharge.Battery, which generally uses, contains elemental lithium
Material is the representative of modern high performance battery as electrode.
Negative material used in the lithium ion battery of Current commercial is generally graphite material, is put down although graphite material has
Steady operating potential and good cycle performance, but specific capacity is relatively low (300mAh/g or so), which limits lithium-ion electrics
Application and performance boost of the pond in high energy density cells.However, silicon has larger theoretical specific capacity, (4200mAh/g is left
It is right), therefore, silicon is applied to have preferably development prospect in the negative material of lithium ion battery.But current silicon-carbon is multiple
Condensation material is applied in the preparation of lithium ion battery negative material there is also electric conductivity is poor and the poor disadvantage of cycle performance,
Developing a kind of negative material and lithium ion battery high comprising Si-C composite material and electric conductivity and cycle performance has weight
Want meaning.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of lithium ion battery negative material, and the second object of the present invention is to carry
For a kind of lithium ion battery, the third object of the present invention is to provide the device of above-mentioned lithium ion battery driving, and of the invention the
Four are designed to provide the preparation method of above-mentioned lithium ion battery, lack a kind of energy density height in the prior art to alleviate, lead
The technical issues of electrical property and good cycle ion cathode material lithium and lithium ion battery at low cost and safe simultaneously.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
The present invention provides a kind of lithium ion battery negative material, and raw material includes that 94-96 parts of silicon-carbons are multiple in parts by weight
Condensation material, 0.5-3 parts of cathode conductive agents and 1.5-4 parts of negative electrode binders.
Further, raw material includes 95-96 part Si-C composite materials in parts by weight, 2-3 parts of cathode conductive agents with
1-5 parts of negative electrode binders.
Further, the negative electrode binder includes CMC and/or SBR；
Preferably, the negative electrode binder includes 0.5-2 parts of CMC and 1-2 parts of SBR in parts by weight；
Preferably, the negative electrode binder includes 1-2 parts of CMC and 1-2 parts of SBR in parts by weight.
Further, the cathode conductive agent includes one or more in carbon nanotube, conductive black or graphene；
Preferably, the Si-C composite material includes silicon-carbon mixed grinding material, silicon-carbon nano-bar material, silicon cladding carbon materials
Material, carbon coating silicon materials or silicon-carbon core-shell material.
The present invention provides a kind of lithium ion battery, including above-mentioned lithium ion battery negative material.
Further, the lithium ion battery further includes positive electrode, and the positive electrode includes NCA, positive electrode binder
Chemical formula with positive conductive agent, the NCA is LiNi0.85Co0.1Al0.05O2；
Preferably, the positive electrode includes 93-97 parts of NCA, 1-2 parts of positive electrode binders and 1-2 in parts by weight
Part positive conductive agent；
Preferably, the positive electrode includes 95-97 part NCA in parts by weight, 1-1.5 parts of positive electrode binders with
1.5-2 part positive conductive agent.
Further, the positive electrode binder includes PVDF.
Further, the positive conductive agent includes one or more in carbon nanotube, conductive black or graphene.
The present invention provides the device driven by above-mentioned lithium ion battery.
The present invention finally provides the preparation method of above-mentioned lithium ion battery, include the following steps：
(a) positive electrode and negative material are coated on to the positive and negative both sides of plus plate current-collecting body and negative current collector respectively, so
Be dried afterwards, roll-in, the positive plate and negative plate for cutting into required suitable dimension；
(b) battery core, wherein negative plate calibration is made with laminar in positive plate, isolation film, negative plate after will be toasted
How a piece of pole piece is；
(c) the battery core coating that will be folded with the aluminum plastic film after punching is cheated, side open-ended, the other side and a upper side seal mouth,
After certain time toasts, appropriate electrolyte is injected in one lateral battery core of open-ended；
(d) through chemical conversion, aging will not seal side heat-sealing to get the lithium ion battery again after pumping.
Compared with prior art, beneficial effects of the present invention are：
Lithium ion battery negative material provided by the invention includes Si-C composite material, negative electrode binder and negative conductive
Agent.The proportioning of each raw material is reasonable in the lithium ion battery negative material, and the content of negative electrode binder and cathode conductive agent is low, is protecting
While demonstrate,proving the electric conductivity and stable cycle performance of negative material, negative material also has energy density high, and stability is good simultaneously
And advantage at low cost.
The above-mentioned ion cathode material lithium of lithium ion battery applications provided by the invention has capacity high, energy density height and
The high advantage of security performance.
The device of above-mentioned lithium ion battery driving provided by the invention, by reducing the cost of lithium ion battery to drop
The low cost of device, and the safety of device is improved, reduce the security risk brought due to battery in device, and make
Use longer life expectancy.
The preparation method provided by the invention for preparing above-mentioned lithium ion battery is simple for process, has a wide range of application, is prepared
Lithium ion battery have the advantages that it is safe and at low cost.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.
The present invention provides a kind of lithium ion battery negative material, raw material includes 94-96 parts of silicon-carbons in parts by weight
Composite material, 0.5-3 parts of cathode conductive agents and 1.5-4 parts of negative electrode binders.
The proportioning of each raw material is reasonable in the lithium ion battery negative material, homogeneity, viscosity and good fluidity.Wherein, it bears
The content ratio of pole binder and cathode conductive agent is low, but can ensure the electric conductivity and cycle performance of negative material, together
When Si-C composite material content ratio it is high, therefore the lithium ion battery negative material has energy density high, and stability is good simultaneously
And advantage at low cost.
Typical but non-limiting Si-C composite material is 94 parts, 94.5 parts, 95 parts, 95.5 parts or 96 parts；Cathode bonds
Typical but non-limiting agent is 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts；Cathode conductive agent is typical but non-limiting
It is 0.5 part, 1 part, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.4 parts, 2.8 parts or 3 parts.
One in the present invention is preferably carried out in mode, and negative electrode binder includes CMC and/or SBR.Carboxymethyl cellulose
Sodium (CMC) is the cellulose derivative that glucose polymerization degree is 100-2000, is good emulsion stabilizer and thickener, has
Excellent freezes and melts stability.SBR is a kind of styrene-butadiene latex, and aqueous binders are by styrene (Styrene) and fourth two
Alkene (Butadiene) monomer is added emulsifier and initiator etc. as medium using water and is generated by emulsion polymerization copolymerization, and state is solid
The aqueous emulsion of content 50% or so.
One in the present invention is preferably carried out in mode, and negative electrode binder includes 0.5-2 parts in parts by weight
CMC and 1-2 parts of SBR.It is 0.5 part that CMC is typical but non-limiting, 0.7 part, 0.9 part, 1 part, 1.2 parts, 1.4 parts, 1.6 parts,
1.8 parts or 2 parts；It is 1 part that SBR is typical but non-limiting, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7
Part, 1.8 parts, 1.9 parts or 2 parts.
One in the present invention is preferably carried out in mode, and cathode conductive agent includes carbon nanotube, conductive black or graphite
It is one or more in alkene.Conductive agent can improve the electron-transport between anode sizing agent and plus plate current-collecting body, reduce electrode
Interface contact resistance plays the role of depolarising.
One in the present invention is preferably carried out in mode, and Si-C composite material includes silicon-carbon mixed grinding material, silicon-carbon
Nano-bar material, silicon coat carbon material, carbon coating silicon materials or silicon-carbon core-shell material.
Silicon-carbon mixed grinding material is silicon-carbon mixing material under the protection of inert gas, the silicon obtained by high energy ball milling
Carbon mixes nano material.The material has good chemical property.
Silicon-carbon nano-bar material can bear silicon materials since carbon nanomaterial has high electric conductivity and strong toughness
The volume expansion that charge and discharge are brought, so silicon-carbon nano material has good cycle performance.
Silicon cladding carbon material is to coat nano silicon particles on the carbon material by the method for deposition, which can improve
The chemical property of carbon material.Conversely, carbon coating silicon can equally improve the capacity of material.
Silicon-carbon core-shell material is equably to coat one layer of carbon material, a kind of novel nucleocapsid of formation in the outer surface of silicon materials
The Si-C composite material of structural composite material, this nucleocapsid can improve the conductivity of silicon but also inhibit the volume of silicon materials
Expansion.
The present invention provides a kind of lithium ion battery, including above-mentioned lithium ion battery negative material.The lithium ion battery has
Have that capacity is high, energy density height and the high advantage of security performance.
One in the present invention is preferably carried out in mode, and lithium ion battery further includes positive electrode, and positive electrode includes
NCA, positive electrode binder and positive conductive agent, wherein the chemical formula of NCA is LiNi0.85Co0.1Al0.05O2。
Nickelic system's positive electrode LiNi0.85Co0.1Al0.05O2(NCA) it is synthesized by polynary transition metal solid solution,
Have both LiNiO2And LiCoO2The advantages of the two, while mixing a small amount of Al members usually rock-steady structure.Three kinds of nickel, cobalt and aluminium metals
Element plays the role of difference in tertiary cathode material, and nickel is active material, has electro-chemical activity, and the content of nickel is higher,
The specific capacity of surfacing plays higher.The proportioning of NCA in the positive electrode, positive electrode binder and positive conductive agent is reasonable,
Positive electrode binder and the content of positive conductive agent are low, and while ensureing that positive electrode performance is stablized, positive electrode also has energy
The advantages of metric density is high, good cycle.Coordinate above-mentioned lithium ion battery negative material that can increase substantially lithium ion battery
Overall performance.
One in the present invention is preferably carried out in mode, and positive electrode includes 93-97 parts of NCA in parts by weight,
1-2 parts of positive electrode binders and 1-2 parts of positive conductive agent.NCA typical but non-limiting is 93 parts, 94 parts, 95 parts, 96 parts or 97
Part；Typical but non-limiting positive electrode binder is 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts；Positive conductive agent allusion quotation
Type but it is unrestricted be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts.
One in the present invention is preferably carried out in mode, and positive electrode binder includes PVDF.PVDF
(Polyvinylidene Fluoride) is polyvinyladine floride.
One in the present invention is preferably carried out in mode, and positive conductive agent includes carbon nanotube, conductive black or graphite
It is one or more in alkene.
The present invention provides a kind of device driven by above-mentioned soft bag lithium ionic cell.The dress of soft package lithium battery driving
It sets, by reducing the cost of soft package lithium battery to reduce the cost of device, and improves the safety of device, reduce
Due to the security risk that battery is brought in device, and the service life is longer.
The present invention provides a kind of preparation method of above-mentioned soft package lithium battery again, includes the following steps：
(a) positive electrode and negative material are coated on to the positive and negative both sides of plus plate current-collecting body and negative current collector respectively, so
Be dried afterwards, roll-in, the positive plate and negative plate for cutting into required suitable dimension；
(b) battery core, wherein negative plate calibration is made with laminar in positive plate, isolation film, negative plate after will be toasted
How a piece of pole piece is；
(c) the battery core coating that will be folded with the aluminum plastic film after punching is cheated, side open-ended, the other side and a upper side seal mouth,
After certain time toasts, appropriate electrolyte is injected in one lateral battery core of open-ended；
(d) through chemical conversion, aging will not seal side heat-sealing to get the lithium ion battery again after pumping.
The preparation method is simple for process, has a wide range of application, and the soft package lithium battery being prepared has safe and cost
Low advantage.
In order to help to further understand the present invention, technical scheme of the present invention is carried out in conjunction with preferred embodiment detailed
Explanation.
Embodiment 1
The present embodiment provides a kind of lithium ion battery negative materials, and meter includes 94 parts of silicon-carbon mixed grinding materials in parts by weight
Material, 3 parts of conductive agents, 0.5 part of CMC and 2 part of SBR.
Embodiment 2
The present embodiment provides a kind of lithium ion battery negative materials, and meter includes 96 parts of silicon-carbon nano-bars in parts by weight
Material, 0.5 part of conductive agent, 2 parts of CMC and 1 part of SBR.
Embodiment 3
The present embodiment provides a kind of lithium ion battery negative materials, and it includes 95 parts of silicon cladding carbon materials to count in parts by weight, and 1
Part conductive agent, 1 part of CMC and 1.5 part of SBR.
Embodiment 4
The present embodiment provides a kind of lithium ion battery negative materials, and meter includes 94.5 parts of silicon-carbon nucleocapsid materials in parts by weight
Material, 1.5 parts of conductive agents, 2 parts of CMC and 1.8 part of SBR.
Embodiment 5
The present embodiment provides a kind of lithium ion battery negative materials, and meter includes 94.5 parts of silicon-carbon nucleocapsid materials in parts by weight
Material, 1.5 parts of conductive agents and 2 parts of SBR.
Comparative example 1
This comparative example provides a kind of lithium ion battery negative material, and meter includes 90 parts of silicon-carbon mixed grindings in parts by weight
Material, 4 parts of conductive agents, 0.1 part of CMC and 10 part of SBR.
Comparative example 2
This comparative example provides a kind of lithium ion battery negative material, and meter includes 98 parts of silicon-carbon nano-bars in parts by weight
Material, 0.2 part of conductive agent, 5 parts of CMC and 0.1 part of SBR.
Comparative example 3
This comparative example provides a kind of lithium ion battery negative material, and meter includes 92 parts of silicon cladding carbon materials in parts by weight
Material, 4 parts of conductive agents, 5 parts of CMC.
Comparative example 4
This comparative example provides a kind of lithium ion battery negative material, and meter includes 98 parts of silicon-carbon nucleocapsid materials in parts by weight
Material, 5 parts of conductive agents, 0.2 part of CMC and 0.4 part of SBR.
Embodiment 6
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 1；Positive electrode
Including 93 parts of LiNi0.85Co0.1Al0.05O2, 2 parts of PVDF and 1 part of conductive blacks.
Embodiment 7
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 2；Positive electrode
Including 97 parts of LiNi0.85Co0.1Al0.05O2, 1 part of PVDF and 2 part of conductive black.
Embodiment 8
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 3；Positive electrode
Including 95 parts of LiNi0.85Co0.1Al0.05O2, 1.5 parts of PVDF and 1.5 part of conductive blacks.
Embodiment 9
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 4；Positive electrode
Including 94 parts of LiNi0.85Co0.1Al0.05O2, 1.3 parts of PVDF and 1.8 part of conductive blacks.
Embodiment 10
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 5；Positive electrode
Including 96 parts of LiNi0.85Co0.1Al0.05O2, 1.7 parts of PVDF and 1.4 part of conductive blacks.
Embodiment 11
The present embodiment provides the negative materials in a kind of lithium ion battery, including positive electrode and embodiment 4；Positive electrode
Including 90 parts of LiNi0.85Co0.1Al0.05O2, 3 parts of PVDF and 0.5 part of conductive blacks.
Comparative example 5
This comparative example provides a kind of lithium ion battery, including the negative material in positive electrode material and comparative example 1；Anode
Material includes 93 parts of LiNi0.85Co0.1Al0.05O2, 2 parts of PVDF and 1 part of conductive blacks.
Comparative example 6
This comparative example provides a kind of lithium ion battery, including the negative material in positive electrode and comparative example 2；Positive electrode
Including 97 parts of LiNi0.85Co0.1Al0.05O2, 1 part of PVDF and 2 part of conductive black.
Comparative example 7
This comparative example provides a kind of lithium ion battery, including the negative material in positive electrode and comparative example 3；Positive electrode
Including 95 parts of LiNi0.85Co0.1Al0.05O2, 1.5 parts of PVDF and 1.5 part of conductive blacks.
Comparative example 8
This comparative example provides a kind of lithium ion battery, including the negative material in positive electrode and comparative example 4；Positive electrode
Including 94 parts of LiNi0.85Co0.1Al0.05O2, 1.3 parts of PVDF and 1.8 part of conductive blacks.
The lithium ion battery of embodiment 6-11 and comparative example 5-8, preparation method includes the following steps：
(a) positive electrode and negative material are coated on to the positive and negative both sides of plus plate current-collecting body and negative current collector respectively, so
Be dried afterwards, roll-in, the positive plate and negative plate for cutting into required suitable dimension；
(b) battery core, wherein negative plate calibration is made with laminar in positive plate, isolation film, negative plate after will be toasted
How a piece of pole piece is；
(c) the battery core coating that will be folded with the aluminum plastic film after punching is cheated, side open-ended, the other side and a upper side seal mouth,
After certain time toasts, appropriate electrolyte is injected in one lateral battery core of open-ended；
(d) through chemical conversion, aging will not seal side heat-sealing to get the lithium ion battery again after pumping.
Test example
Electrochemical property test is carried out to the lithium ion battery of embodiment 6-11 and comparative example 5-8, the results are shown in Table 1.
The performance test of 1 lithium ion battery of table
By result above it is found that preparing lithium ion battery, the lithium-ion electric of embodiment 6-11 by identical assemble method
Pond is better than the lithium ion battery of comparative example 5-8 in the performance detection of initial capacity and cycle-index.Offer of the present invention is provided
Lithium ion battery initial capacity and energy density it is high, performance is good.
Further analysis is it is found that embodiment 6-9 corresponds to phase respectively with the soft package lithium battery positive electrode of comparative example 5-8
Together, but negative material is different.The properties of embodiment 6-9 are superior to comparative example 5-8 known to test result, illustrate the present invention
The negative material raw material and proportioning of offer are reasonable, and the high safety simultaneously of performance of lithium ion battery of preparation is good.
Further analysis is it is found that embodiment 9 is identical with the negative material of the lithium ion battery of embodiment 11, but just
Pole material is different.The properties of embodiment 9 are superior to embodiment 11 known to test result, illustrate positive material provided by the invention
Material proportioning is reasonable, and the high safety simultaneously of performance of lithium ion battery of preparation is good.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of lithium ion battery negative material, which is characterized in that raw material includes that 94-96 parts of silicon-carbons are compound in parts by weight
Material, 0.5-3 parts of cathode conductive agents and 1.5-4 parts of negative electrode binders.
2. lithium ion battery negative material according to claim 1, which is characterized in that raw material includes in parts by weight
95-96 parts of Si-C composite materials, 1-2 parts of cathode conductive agents and 2-3 parts of negative electrode binders.
3. lithium ion battery negative material according to claim 1, which is characterized in that the negative electrode binder includes CMC
And/or SBR；
Preferably, the negative electrode binder includes 0.5-2 parts of CMC and 1-2 parts of SBR in parts by weight；
Preferably, the negative electrode binder includes 1-2 parts of CMC and 1-2 parts of SBR in parts by weight.
4. lithium ion battery negative material according to claim 1 or 2, which is characterized in that the cathode conductive agent includes
It is one or more in carbon nanotube, conductive black or graphene；
Preferably, the Si-C composite material includes silicon-carbon mixed grinding material, silicon-carbon nano-bar material, and silicon coats carbon material,
Carbon coating silicon materials or silicon-carbon core-shell material.
5. a kind of lithium ion battery, which is characterized in that including claim 1-4 any one of them negative electrode of lithium ion battery materials
Material.
6. lithium ion battery according to claim 5, which is characterized in that the lithium ion battery further includes positive electrode,
The positive electrode includes NCA, positive electrode binder and positive conductive agent, and the chemical formula of the NCA is
LiNi0.85Co0.1Al0.05O2；
Preferably, the positive electrode includes 93-97 parts of NCA in parts by weight, and 1-2 parts of positive electrode binders and 1-2 parts are just
Pole conductive agent；
Preferably, the positive electrode includes 95-97 parts of NCA, 1-1.5 parts of positive electrode binders and 1.5-2 in parts by weight
Part positive conductive agent.
7. lithium ion battery according to claim 6, which is characterized in that the positive electrode binder includes PVDF.
8. lithium ion battery according to claim 6, which is characterized in that the positive conductive agent includes carbon nanotube, leads
It is one or more in electric carbon black or graphene.
9. a kind of device driven by claim 5-8 any one of them lithium ion batteries.
10. a kind of preparation method of claim 5-8 any one of them lithium ion batteries, which is characterized in that including following step
Suddenly：
(a) positive electrode and negative material are coated on to the positive and negative both sides of plus plate current-collecting body and negative current collector respectively, then into
Row drying, roll-in, the positive plate and negative plate for cutting into required suitable dimension；
(b) battery core is made with laminar in positive plate, isolation film, negative plate after will be toasted, and wherein negative plate is compared with positive plate
It is mostly a piece of；
(c) the battery core coating that will be folded with the aluminum plastic film after punching is cheated, side open-ended, the other side and a upper side seal mouth, through one
It fixes time after baking, injects appropriate electrolyte in one lateral battery core of open-ended；
(d) through chemical conversion, aging will not seal side heat-sealing to get the lithium ion battery again after pumping.
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| CN111916817A (en) * | 2020-07-01 | 2020-11-10 | 浙江工业大学 | Lithium ion battery with high capacity and cycle performance |
| CN113903891A (en) * | 2021-09-03 | 2022-01-07 | 北京化工大学 | Preparation method and application of amorphous carbon-based composite anode material containing metalloid lithium |
| CN115108556A (en) * | 2021-03-17 | 2022-09-27 | 赵飞 | Silicon-carbon composite material and preparation method thereof |
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