CN202564476U - Graphite ball for lithium ion battery cathode - Google Patents
Graphite ball for lithium ion battery cathode Download PDFInfo
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- CN202564476U CN202564476U CN2012201504331U CN201220150433U CN202564476U CN 202564476 U CN202564476 U CN 202564476U CN 2012201504331 U CN2012201504331 U CN 2012201504331U CN 201220150433 U CN201220150433 U CN 201220150433U CN 202564476 U CN202564476 U CN 202564476U
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- graphite
- lithium ion
- ion battery
- graphite ball
- battery cathode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to battery materials and discloses a graphite ball for a lithium ion battery cathode. The graphite ball for the lithium ion battery cathode comprises a graphite ball body and an amorphous carbon layer coated on the surface of the graphite ball body. Due to the fact that the graphite ball is used as the lithium ion battery cathode, the graphite ball for lithium ion battery cathode has the advantages of high volume specific capacity, good compatibility with electrolyte, and big current charge-discharge.
Description
Technical field
The utility model relates to battery material, especially relates to a kind of used as negative electrode of Li-ion battery graphite nodule.
Background technology
The chief component of lithium ion battery has positive pole, negative pole, electrolyte that can the conductive lithium ion and the barrier film that separates both positive and negative polarity.Lithium ion in when charging positive electrode begin to break away from anodal through barrier film to the migration of negative pole direction, on negative pole, be reduced to lithium and be stored in the negative material with an electronics.During discharge in negative pole lithium lose an electronics and become lithium ion, and through barrier film to positive extreme direction migration and be stored in the positive electrode.Because lithium ion is migration back and forth between both positive and negative polarity when discharging and recharging, lithium ion battery is claimed " rocking chair battery " usually again.Anode generally is some slotting lithium compounds, comprises LiCoO2, LiNiO2, LiMn2O4, LiFePO4 etc., and negative material mainly is to adopt carbon-lithium intercalation compound, and electrolyte is the solvent that has dissolved LiPF6, LiClO4, LiAsF6 etc.Solvent mainly contains EC, PC, DMC, CLMC etc.At charging process towel, lithium ion is deviate from from LiCoO2, embeds in the graphite through organic electrolyte.Electronics enters into negative pole via external circuit simultaneously, and guarantee the charge balance of negative pole: then opposite during discharge, lithium ion is deviate to get back among the LiCoO2 from negative pole.What take place in the charge and discharge process is lithium ion moving between both positive and negative polarity.Native graphite is a kind of good negative material.Its cost is low, crystallization degree is high, purification, pulverizing, classification technique maturation, and these are had laid a good foundation for its application in the lithium ion battery industry.But native graphite as the shortcoming of GND is: poor with the electrolyte compatibility, the first charge-discharge reversible capacity is low, is not suitable for high current charge-discharge, and cycle performance is poor.
People are through discovering; Graphite is in cyclic process first; Form the SEI film owing to reacting with electrolyte, this layer film allows lithium ion to pass freely through, and prevents that the solvation lithium ion from getting into; This that on graphite surface, forms like this layer SEI film just can prevent that graphite electrode from further not corroded by electrolyte, keeps excellent cycle performance.But the formation of SEI film inevitably can produce big irreversible capacity.Therefore, this irreversible reaction is main relevant with the surface texture of solvent species and graphite.Electrolyte occurs in two positions generations respectively to the corrosion of graphite material: one is the surface of graphite; Another one is a graphite layers, the latter mainly is because the graphite linings that is inserted into of solvation lithium ion is asked, solvent and graphite react and causes.We know that graphite crystal is an aeolotropic crystal, and it has end face and basal plane, owing on the end face a lot of high activity groups are arranged, so end face is active more a lot of than basal plane, irreversible reaction mostly occurs on the end face of graphite.During as electrode, what contact with electrolyte possibly be end face, also possibly be basal plane at graphite.
Summary of the invention
Above-mentioned native graphite is poor as the compatibility of GND and electrolyte in order to overcome, the first charge-discharge reversible capacity is low, be not suitable for high current charge-discharge, the shortcoming of cycle performance difference, the utility model purpose be to provide a kind of volume and capacity ratio high, with the used as negative electrode of Li-ion battery graphite nodule that compatibility is good, electric current charges and discharge TV university of electrolyte.
The purpose of the utility model realizes through following technical measures, and a kind of used as negative electrode of Li-ion battery graphite nodule comprises the amorphous carbon layer of graphite nodule body and coated graphite ball body surface.
As a kind of optimal way, said graphite nodule body is spheroidal or elliposoidal.
The utility model is through coating one deck amorphous carbon layer on the graphite nodule surface; The interlamellar spacing of setting material with carbon element is bigger than graphite; Can improve lithium ion diffusion therein; This is equivalent to form at the graphite outer surface resilient coating of one deck lithium ion, thereby improves the high rate during charging-discharging of graphite material.Amorphous carbon layer has avoided organic solvent directly to contact with graphite surface, and the RESEARCH OF PYROCARBON material on surface is inactive for organic solvent.Because its Turbostratic, the organic solvent micromolecule is difficult to be inserted into altogether in the RESEARCH OF PYROCARBON lamella, coats the surface area that also reduces graphite simultaneously.These factors increase the reversible capacity of the utility model greatly.
Description of drawings
Fig. 1 is the profile of the utility model.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is done further explain.
Like Fig. 1, a kind of used as negative electrode of Li-ion battery graphite nodule comprises the amorphous carbon layer 2 on spherical graphite ball body 1 and coated graphite ball body 1 surface.
This amorphous carbon layer 2 is that phenolic resins forms through 950 ℃ of carbonizations, an amount of graphite nodule (covering amount is 15%) that coats after handling, and its initial charge efficient, charging capacity all is improved, and cycle performance has had obvious improvement.The initial charge reversible capacity of original spherical natural graphite is 278mAh/g, first charge-discharge efficiency 67.5%; Composite material reversible capacity after amorphous carbon layer coats can reach 345mAh/g, first charge-discharge efficiency 89.3%.After ten circulations, still have reversible capacity, and the reversible capacity of original spherical natural graphite has dropped to 174mAh/g up to 327mAh/g.
More than be that the utility model used as negative electrode of Li-ion battery graphite nodule is set forth; Be used for helping to understand the utility model; But the execution mode of the utility model is not restricted to the described embodiments; Anyly do not deviate from the change done under the utility model principle, modification, substitute, combination, simplify, all should be the substitute mode of equivalence, be included within the protection range of the utility model.
Claims (2)
1. a used as negative electrode of Li-ion battery graphite nodule is characterized in that: the amorphous carbon layer that comprises graphite nodule body and coated graphite ball body surface.
2. used as negative electrode of Li-ion battery graphite nodule according to claim 1 is characterized in that: said graphite nodule body is spheroidal or elliposoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201504331U CN202564476U (en) | 2012-04-11 | 2012-04-11 | Graphite ball for lithium ion battery cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201504331U CN202564476U (en) | 2012-04-11 | 2012-04-11 | Graphite ball for lithium ion battery cathode |
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| Publication Number | Publication Date |
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| CN202564476U true CN202564476U (en) | 2012-11-28 |
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| CN2012201504331U Expired - Lifetime CN202564476U (en) | 2012-04-11 | 2012-04-11 | Graphite ball for lithium ion battery cathode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969400A (en) * | 2013-06-05 | 2015-10-07 | 株式会社Lg化学 | Novel secondary battery |
| CN109638260A (en) * | 2018-12-19 | 2019-04-16 | 中国科学院山西煤炭化学研究所 | A kind of preparation method of carbon coated graphite negative electrode material |
| CN114094201A (en) * | 2022-01-24 | 2022-02-25 | 深圳市睿赛新能源科技有限公司 | Lithium iron phosphate battery |
-
2012
- 2012-04-11 CN CN2012201504331U patent/CN202564476U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104969400A (en) * | 2013-06-05 | 2015-10-07 | 株式会社Lg化学 | Novel secondary battery |
| US10044029B2 (en) | 2013-06-05 | 2018-08-07 | Lg Chem, Ltd. | Secondary battery |
| CN110010859A (en) * | 2013-06-05 | 2019-07-12 | 株式会社Lg化学 | New secondary battery, battery module, battery pack and device |
| CN110010859B (en) * | 2013-06-05 | 2022-05-24 | 株式会社Lg化学 | Secondary battery, battery module, battery pack, and device |
| CN109638260A (en) * | 2018-12-19 | 2019-04-16 | 中国科学院山西煤炭化学研究所 | A kind of preparation method of carbon coated graphite negative electrode material |
| CN109638260B (en) * | 2018-12-19 | 2022-10-25 | 中国科学院山西煤炭化学研究所 | Preparation method of carbon-coated graphite negative electrode material |
| CN114094201A (en) * | 2022-01-24 | 2022-02-25 | 深圳市睿赛新能源科技有限公司 | Lithium iron phosphate battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 9, J building, building 20, block C, 1 Science Park, Shenzhen Road, Longhua New District, Longhua, Guangdong, 518000, China Patentee after: Shenzhen City Cheung Polytron Technologies Inc Fenghua Address before: 518000, Guangdong, Baoan District, Fuyong Shenzhen street, with the rich industrial zone third floors Patentee before: Shenzhen City Xiangfenghua Technology Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121128 |