CN110085867A - A kind of binder and preparation method thereof for lithium ion battery silicon-carbon cathode - Google Patents
A kind of binder and preparation method thereof for lithium ion battery silicon-carbon cathode Download PDFInfo
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- CN110085867A CN110085867A CN201910486442.4A CN201910486442A CN110085867A CN 110085867 A CN110085867 A CN 110085867A CN 201910486442 A CN201910486442 A CN 201910486442A CN 110085867 A CN110085867 A CN 110085867A
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- Prior art keywords
- binder
- carbon cathode
- ion battery
- lithium ion
- metal oxide
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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
- H01M10/052—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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The binder and preparation method thereof that the invention discloses a kind of for lithium ion battery silicon-carbon cathode, the binder are made of main body binder and additive.Main body binder is polyacrylic acid (PAA, molecular weight 10w ~ 300w), and additive is metal oxide and lithium hydroxide.Polyacrylic acid is dissolved in dispersing agent, obtain presoma, then additive metal oxide is added in presoma, constant temperature stirring, after metal oxide is dissolved in aqueous solution, additive lithium hydroxide is added in presoma again, dissolving to all additives and stirring evenly acquired solution is novel silicon-carbon cathode binder.Preparation method is simple for the binder, low in cost, and bulk effect of the silicon-carbon cathode in charge and discharge process can be effectively relieved, to improve the first effect and cycle life of silicon-carbon cathode material, has very strong market application value.
Description
Technical field
The present invention relates to lithium ion silicon-carbon cathode material binder preparation technical field, more particularly to one kind for lithium from
The binder and preparation method thereof of sub- battery silicon-carbon cathode.
Background technique
Extension with lithium ion battery in social different application field, people are more next to the performance requirement of lithium ion battery
It is higher.Lithium ion battery negative material mainly uses graphite at present, and the specific capacity of high-grade commercialization graphite has reached 360mAh/g,
And the theoretical capacity of graphite is 372mAh/g, therefore graphite cathode has rarely had the space of promotion.Silicon based anode material has height
Specific capacity (4200mAh/g) and be considered as the material that can most replace graphite.But silica-base material is in battery charge and discharge process
Volume expansion and contraction can occur, cubical expansivity is up to 400%, therefore is easy to make cathode that cracking, dusting and removing occur
Lead to battery failure.
While battery cathode binder can fetter silicon-carbon cathode material volume expansion, it is also used as padded coaming, is weakened
The bulk effect of silicon-carbon cathode.PAA binder has carboxylic group, can form a large amount of hydrogen bond, can effectively weaken the volume of silicon
Effect improves its first charge-discharge efficiency.But during long-term cycle charge-discharge, the viscosity of PAA can gradually be deteriorated and cause
Negative electrode material dusting and removing, therefore the modification of PAA is concerned.
Summary of the invention
The case where for current silicon-carbon cathode material binder intolerant to circulation, it is an object of that present invention to provide one kind to be used for lithium
The binder of ion battery silicon-carbon cathode.
Of the invention is again with purpose: providing a kind of preparation side of binder for lithium ion battery silicon-carbon cathode
Method.
Present invention provide the technical scheme that a kind of binder for lithium ion battery silicon-carbon cathode, the binder by
Main body binder and additive composition, main body binder are polyacrylic acid (PAA, molecular weight 10w ~ 300w), and additive is metal
Oxide and lithium hydroxide, wherein main body binder PAA number of monomers: metal oxide: lithium hydroxide molar fraction ratio is 1:
(0.01 ~ 0.5): (0 ~ 0.98).
On the basis of above scheme, the metal oxide is magnesia, aluminium oxide, calcium oxide, one in iron oxide
Kind is several.
The present invention provides a kind of preparation method of above-mentioned binder for lithium ion battery silicon-carbon cathode: by polyacrylic acid
It is dissolved in dispersing agent, obtains presoma, then additive metal oxide is added in precursor solution, constant temperature stirring, to
After metal oxide is dissolved in precursor solution, then by additive lithium hydroxide be added precursor solution in, to all additives
Dissolving and stirring evenly acquired solution is novel silicon-carbon cathode binder.
The dispersing agent is one or more of water, sodium carboxymethylcellulose (CMC) and butadiene-styrene rubber (SBR).
On the basis of above scheme, the dispersing agent is the mixture of water, CMC and SBR, each component mass ratio are as follows: point
Powder mass ratio is water: CMC:SBR=1:(0 ~ 0.5): (0 ~ 0.5).
Of the invention to be advantageous in that: volume effect of the silicon-carbon cathode in charge and discharge process can be effectively relieved in product of the present invention
It answers, to improve the first effect and cycle life of silicon-carbon cathode material, there is very strong market application value.The system of product of the present invention
Preparation Method is simple and easy, low in cost.
Specific embodiment
Embodiment 1
A kind of binder for lithium ion battery silicon-carbon cathode, including main body binder and additive composition, the main body
Binder is the polyacrylic acid (PAA) of molecular weight 25w, and the additive is calcium oxide, wherein main body binder PAA monomer
Number: calcium oxide molar fraction ratio is 1:0.05.
Preparation method is in the steps below:
A) PAA(molecular weight 25W is taken) it is dissolved in suitable water, precursor solution is made；
B) by PAA number of monomers: calcium oxide molar ratio is that 1:0.05 weighs calcium oxide, and is dissolved in precursor solution；
C) calcium to be oxidized is dissolved completely in precursor solution, i.e. acquisition target binder solution.
Embodiment 2
A kind of binder for lithium ion battery silicon-carbon cathode, including main body binder and additive composition, the main body
Binder is the polyacrylic acid (PAA) of molecular weight 200w, and the additive is magnesia, wherein main body binder PAA monomer
Number: magnesia molar fraction ratio is 1:0.05.
Preparation method is in the steps below:
A) PAA(molecular weight 200W is taken) it is dissolved in suitable water, and CMC and SBR is added, wherein water: CMC:SBR mass ratio
For 1:0.01:0.01, precursor solution is made；
B) by PAA number of monomers: magnesia molar ratio is that 1:0.05 weighs magnesia, and is dissolved in precursor solution；
C) magnesium to be oxidized is dissolved completely in precursor solution, i.e. acquisition target binder solution.
Embodiment 3
A kind of binder for lithium ion battery silicon-carbon cathode, including main body binder and additive composition, the main body
Binder is the polyacrylic acid (PAA) of molecular weight 200W, and the additive is calcium oxide and magnesia, wherein main body bonding
Agent PAA number of monomers: calcium oxide: and magnesia molar fraction ratio is 1:0.025:0.001.
Preparation method is in the steps below:
A) PAA(molecular weight 200W is taken) it is dissolved in suitable water, and CMC and SBR is added, wherein water: CMC:SBR mass ratio
For 1:0.01:0.01, precursor solution is made；
B) by PAA number of monomers: calcium oxide: magnesia molar ratio weighs calcium oxide and magnesia for 1:0.025:0.001, and will
It is dissolved in precursor solution；
C) calcium and magnesia to be oxidized are dissolved completely in precursor solution, i.e. acquisition target binder solution.
Embodiment 4
A kind of binder for lithium ion battery silicon-carbon cathode, including main body binder and additive composition, the main body
Binder is the polyacrylic acid (PAA) of molecular weight 200W, and the additive is calcium oxide, wherein main body binder PAA monomer
Number: calcium oxide molar fraction ratio is 1:0.025.
Preparation method is in the steps below:
A) PAA(molecular weight 200W is taken) it is dissolved in suitable water, and CMC is added, wherein water: CMC mass ratio is 1:0.02
Precursor solution is made；
B) by PAA number of monomers: calcium oxide molar ratio is that 1:0.025 weighs calcium oxide, and is dissolved in precursor solution；
C) calcium to be oxidized is dissolved completely in precursor solution, i.e. acquisition target binder solution.
The above embodiment is merely an example for clearly illustrating the present invention, and does not limit the embodiments.
For those of ordinary skill in the art, other various forms of variations can also be made on the basis of the above description
Or it changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus amplified out
Or it changes and is still in the protection scope of this invention.
Claims (5)
1. a kind of binder for lithium ion battery silicon-carbon cathode, including main body binder and additive composition, feature exist
In the polyacrylic acid (PAA) that, the main body binder is molecular weight 10w ~ 300w, the additive be metal oxide and
Lithium hydroxide, wherein main body binder PAA number of monomers: metal oxide: lithium hydroxide molar fraction ratio be 1:(0.01 ~
0.5): (0 ~ 0.98).
2. being used for the binder of lithium ion battery silicon-carbon cathode according to claim 1, which is characterized in that it is characterized in that,
The metal oxide is one or more of magnesia, aluminium oxide, calcium oxide, iron oxide.
3. the preparation method of the binder according to claim 1 or claim 2 for lithium ion battery silicon-carbon cathode, feature exist
In, polyacrylic acid is dissolved in dispersing agent, obtain presoma, then by metal oxide be added precursor solution in, constant temperature
Stirring is added in precursor solution, to all additives after metal oxide is dissolved in precursor solution, then by lithium hydroxide
Dissolving and stirring evenly acquired solution is final products, the binder for lithium ion battery silicon-carbon cathode.
4. the preparation method for the binder of lithium ion battery silicon-carbon cathode according to claim 3, which is characterized in that institute
The dispersing agent stated is one or more of water, sodium carboxymethylcellulose (CMC) and butadiene-styrene rubber (SBR).
5. being used for the binder of lithium ion battery silicon-carbon cathode according to claim 4, which is characterized in that the dispersing agent
For the mixture of water, CMC and SBR, each component mass ratio are as follows: water: CMC:SBR=1:(0 ~ 0.5): (0 ~ 0.5).
Priority Applications (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492103A (en) * | 2019-08-19 | 2019-11-22 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of preparation method of lithium ion battery silicon-carbon cathode binder and products thereof and application |
| CN113258068A (en) * | 2021-04-28 | 2021-08-13 | 东莞市创明电池技术有限公司 | Binder for silicon negative electrode of lithium ion battery, negative electrode slurry and preparation method of negative electrode slurry |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110492103A (en) * | 2019-08-19 | 2019-11-22 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of preparation method of lithium ion battery silicon-carbon cathode binder and products thereof and application |
| CN113258068A (en) * | 2021-04-28 | 2021-08-13 | 东莞市创明电池技术有限公司 | Binder for silicon negative electrode of lithium ion battery, negative electrode slurry and preparation method of negative electrode slurry |
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Application publication date: 20190802 |
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