CN1222579C - Process for preparing carbon coated graphite microparticles - Google Patents
Process for preparing carbon coated graphite microparticles Download PDFInfo
- Publication number
- CN1222579C CN1222579C CN 02125715 CN02125715A CN1222579C CN 1222579 C CN1222579 C CN 1222579C CN 02125715 CN02125715 CN 02125715 CN 02125715 A CN02125715 A CN 02125715A CN 1222579 C CN1222579 C CN 1222579C
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- China
- Prior art keywords
- graphite
- graphite microparticles
- carbon coated
- microparticles
- preparation
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 57
- 239000010439 graphite Substances 0.000 title claims abstract description 57
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 239000011859 microparticle Substances 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000003179 granulation Effects 0.000 claims abstract description 4
- 238000005469 granulation Methods 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 239000003610 charcoal Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000013081 microcrystal Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229920003987 resole Polymers 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 11
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000002427 irreversible effect Effects 0.000 abstract description 3
- 239000007773 negative electrode material Substances 0.000 abstract 2
- 239000011258 core-shell material Substances 0.000 abstract 1
- 239000007772 electrode material Substances 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 239000008151 electrolyte solution Substances 0.000 description 5
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- -1 propylene carbonate ester Chemical class 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention discloses a method for preparing carbon coated graphite micropowder used as lithium ion battery negative electrode material which belongs to processing technology for battery electrode material. A layer of carbon is coated on the surface of graphite micropowder by using a spray granulation method to obtain the carbon coated graphite micropowder with a core-shell structure with the interior of graphite and the outer layer of carbon. Thus, the first irreversible capacity of the graphite as the lithium ion battery negative electrode material can be reduced. Meanwhile, the cyclical stability of the graphite can be enhanced. A road is developed for the application of the graphite in the lithium ion batteries of PC electrolyte, and the service life of the lithium ion battery is enhanced.
Description
Technical field
The invention belongs to battery terminal material preparation technology scope, particularly as the good cycling stability of lithium ion battery negative material, the preparation method of a kind of carbon coated graphite microparticles that can in containing electricity Jie solution of propylene carbonate ester (PC), use.
Background technology
Because advantages such as it is low that graphite material has charging and discharging lithium battery voltage, and charge and discharge platform is long, and cycle life is good, it is as lithium ion battery anode material commercialization.But because small-molecule substances such as electrolytic solution are inserted altogether, graphite expansion and contraction cause graphite flake layer to come off, and make irreversible capacity bigger, and cycle life reduces.Graphite can not use in PC (propylene carbonate) electrolytic solution, and PC is the more satisfactory electrolytic solution of lithium ion battery as electrolytic solution, and then graphite is used in lithium ion battery and is restricted.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method who is used as the carbon coated graphite microparticles of lithium ion battery negative material, it is characterized in that: adopt the method for mist projection granulating to prepare carbon coated graphite microparticles, earlier graphite microparticles and resin that is used as coating layer and ethanol are mixed formation suspension with mass ratio at 1: 1: 1, the suspension for preparing is sprayed droplet with high speed, the atomizing granulation disperses, the resin liquid flow constriction of fluidised form, form one deck encasement on the graphite microparticles surface, the composite micro-powder that mist projection granulating is obtained, in warm air after the drying, doing charing through 700-1200 ℃ again handles, obtain the inner graphite that is, the outside is the graphite microparticles of the nucleocapsid structure of charcoal.
Described graphite microparticles is natural micro crystal graphite, crystalline flake graphite or electrographite.
Described graphite microparticles makes its shape near spherical through shaping, and granularity is between 5-40 μ m.
The resin of described coating layer is a kind of in resol, Resins, epoxy, the furfuryl resin.
The invention has the beneficial effects as follows that carbon coated graphite can upward reduce the irreversible capacity first of graphite largely, improve cyclical stability, kept low to charging and discharging lithium battery voltage, charge and discharge platform is long, the advantage that cycle life is good.Carbon coated graphite can use in containing the electrolytic solution of PC, and graphite is used in lithium ion battery and opened up new way.
Description of drawings
Fig. 1 is the synoptic diagram of carbon coated graphite microparticles preparation.
Fig. 2 is the electromicroscopic photograph figure of carbon coated graphite microparticles.
Fig. 3 is the structure synoptic diagram of carbon coated graphite microparticles.
Embodiment
The present invention is the preparation method as the carbon coated graphite microparticles of lithium ion battery negative material, Figure 1 shows that the synoptic diagram of carbon coated graphite microparticles preparation.Adopt the method for mist projection granulating to prepare carbon coated graphite microparticles, earlier graphite microparticles and resin that is used as the charcoal coating layer and ethanol are mixed formation suspension with mass ratio at 1: 1: 1, the suspension for preparing is sprayed droplet at a high speed, the atomizing granulation disperses, in this process, because the effect of surface energy, the resin liquid of fluidised form is with flow constriction, form one deck encasement on the graphite microparticles surface, the composite micro-powder that mist projection granulating is obtained after the drying, is done charing through 700-1200 ℃ again and is handled in warm air then, obtain the inner graphite that is, the outside is the graphite microparticles of the nucleocapsid structure of charcoal.(as shown in Figure 2).The resin of used coating layer is resol, Resins, epoxy or furfuryl resin.Above-mentioned graphite microparticles is natural micro crystal graphite (also being called amorphous graphite or amorphous graphite), crystalline flake graphite, electrographite etc.; These graphite microparticles are through making its shape near spherical (shown in Fig. 3 metallograph) after the shaping, granularity is between 5-40 μ m.
Claims (4)
1. the preparation method of a carbon coated graphite microparticles, it is characterized in that: adopt the method for mist projection granulating to prepare carbon coated graphite microparticles, earlier graphite microparticles and resin that is used as coating layer and ethanol are mixed formation suspension with mass ratio at 1: 1: 1, the suspension for preparing is sprayed droplet with high speed, the atomizing granulation disperses, the resin liquid flow constriction of fluidised form, form one deck encasement on the graphite microparticles surface, the composite micro-powder that mist projection granulating is obtained, in warm air after the drying, do charing through 700-1200 ℃ again and handle, obtain the inner graphite that is, the outside is the graphite microparticles of the nucleocapsid structure of charcoal.
2. according to the preparation method of the described carbon coated graphite microparticles of claim 1, it is characterized in that: described graphite microparticles is natural micro crystal graphite, crystalline flake graphite or electrographite.
3. according to the preparation method of the described carbon coated graphite microparticles of claim 1, it is characterized in that: described graphite microparticles makes its shape near spherical through shaping, and granularity is between 5-40 μ m.
4. according to the preparation method of the described carbon coated graphite microparticles of claim 1, it is characterized in that: the resin of described coating layer is a kind of in resol, Resins, epoxy, the furfuryl resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02125715 CN1222579C (en) | 2002-08-14 | 2002-08-14 | Process for preparing carbon coated graphite microparticles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02125715 CN1222579C (en) | 2002-08-14 | 2002-08-14 | Process for preparing carbon coated graphite microparticles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1397598A CN1397598A (en) | 2003-02-19 |
| CN1222579C true CN1222579C (en) | 2005-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02125715 Expired - Fee Related CN1222579C (en) | 2002-08-14 | 2002-08-14 | Process for preparing carbon coated graphite microparticles |
Country Status (1)
| Country | Link |
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| CN (1) | CN1222579C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087021B (en) * | 2007-07-18 | 2014-04-30 | 深圳市贝特瑞新能源材料股份有限公司 | Man-made graphite cathode material for lithium ion battery and its making method |
| CN102610795B (en) * | 2011-01-20 | 2016-04-27 | 宁波宏远炭素工业有限公司 | A kind of preparation method of carbon negative electrode material of lithium ion cell coating layer |
| CN102522561A (en) * | 2011-12-21 | 2012-06-27 | 清华大学 | Lithium ion battery cathode material and preparation method thereof |
| CN103311517B (en) * | 2012-03-07 | 2017-09-29 | 上海杉杉科技有限公司 | Lithium ion battery TiO2Coated graphite composite particles and its preparation method and application |
| CN102891297B (en) * | 2012-11-10 | 2015-05-13 | 江西正拓新能源科技股份有限公司 | Silicon-carbon composite material for lithium ion battery and preparation method thereof |
| CN102945951B (en) * | 2012-11-28 | 2015-01-21 | 深圳市雄韬电源科技股份有限公司 | Preparation of lead carbon composite material and method manufacturing lead carbon batteries by utilizing material |
| CN108010726A (en) * | 2016-11-01 | 2018-05-08 | 东莞市东阳光电容器有限公司 | A kind of ultracapacitor nucleocapsid porous electrode material and preparation method thereof |
| CN108630940B (en) * | 2017-03-24 | 2021-07-13 | 宁波杉杉新材料科技有限公司 | Preparation method of high-capacity natural graphite negative electrode material |
| CN108275673A (en) * | 2018-04-07 | 2018-07-13 | 蒋黎婷 | A kind of preparation method of high-performance porous graphene film |
| CN108598478A (en) * | 2018-04-25 | 2018-09-28 | 北方奥钛纳米技术有限公司 | Modified graphite preparation method and modified graphite |
| CN110797513B (en) * | 2018-08-03 | 2022-04-05 | 天津大学 | Graphite-hard carbon coated material and preparation method thereof |
| CN109616638B (en) * | 2018-12-05 | 2020-08-25 | 中南大学 | Spherical core-shell structure mixed graphite @ hard carbon composite material and preparation method and application thereof |
| CN111224104B (en) * | 2020-02-21 | 2021-08-10 | 超威电源集团有限公司 | Carbon composite material, paste, battery and preparation method |
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- 2002-08-14 CN CN 02125715 patent/CN1222579C/en not_active Expired - Fee Related
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| CN1397598A (en) | 2003-02-19 |
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