CN102214825A - Cathode material of lithium ion battery and manufacturing method thereof as well as method for reducing low-temperature lithium separation - Google Patents
Cathode material of lithium ion battery and manufacturing method thereof as well as method for reducing low-temperature lithium separation Download PDFInfo
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- CN102214825A CN102214825A CN2010101441817A CN201010144181A CN102214825A CN 102214825 A CN102214825 A CN 102214825A CN 2010101441817 A CN2010101441817 A CN 2010101441817A CN 201010144181 A CN201010144181 A CN 201010144181A CN 102214825 A CN102214825 A CN 102214825A
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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 invention provides a cathode material of a lithium ion battery and a manufacturing method thereof as well as a method for reducing low-temperature lithium separation. Natural graphite and synthetic graphite are mixed in a specific proportion and then the mixed graphite is taken as the cathode material of the lithium ion battery; and the volume of the natural graphite is 61%-69%, thus reducing the low-temperature lithium separation of the cathode material and improving low-temperature performance of the lithium ion battery. The method for reducing the low-temperature lithium separation is simple and easy to realize industrialized popularization and application.
Description
Technical field
The present invention relates to technical field of lithium ion, particularly relate to a kind of lithium ion battery negative material, this preparation methods, and reduce the method that lithium ion battery negative material low temperature is analysed the lithium phenomenon.
Background technology
Because winter temperature is lower, the apparent in view lithium phenomenon of analysing usually appears in electric core at low temperatures.Discover that by analysis the major influence factors that causes electric core low temperature to analyse lithium is a negative material.Yet a large amount of pure natural graphite and the pure Delaniums that use in workshop all have serious low temperature to analyse the lithium phenomenon at present.What research was more at present is the coating method, coating method, and the doped chemical method, oxidation-reduction method, surface modifying methods such as mechanical milling method, these method complicated operations, the cost height is unfavorable for applying.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of and can improve the lithium ion battery cryogenic property well, the low temperature that reduces negative material is analysed the cathode blending method of lithium phenomenon.
Another object of the present invention is to provide a kind of and can improve the lithium ion battery cryogenic property well, the lithium ion battery negative material that the low temperature of minimizing negative material is analysed the lithium phenomenon.
A further object of the present invention is to provide the lithium ion battery that adopts above-mentioned negative material.
For achieving the above object, the present invention has adopted following technical scheme:
The invention discloses a kind of lithium ion battery negative material, described negative material comprises mixing of native graphite and Delanium, and native graphite shared volume ratio in both is 61%～69%.
Preferably, native graphite shared volume ratio in both is 63%～67%, and most preferably native graphite shared volume ratio in both is 65%.
In the concrete execution mode of the present invention, the mixed D50 of native graphite and Delanium is 16～18 μ m.
The invention also discloses a kind of lithium ion battery negative material preparation method, described method comprises: native graphite and Delanium are mixed as negative material, and native graphite shared volume ratio in both is 61%～69%.
Native graphite shared volume ratio in both is preferably 63%～67%, and more preferably 65%.
The invention also discloses a kind of method that lithium ion battery negative material low temperature is analysed the lithium phenomenon that reduces, described method comprises that the above-mentioned method for preparing negative material of employing prepares negative material.
Owing to adopted above technical scheme, the beneficial effect that the present invention is possessed is:
The present invention can reduce negative material low temperature well and analyse the lithium phenomenon by native graphite and Delanium are mixed the negative material of back as lithium ion battery according to special ratios, improves the cryogenic property of lithium ion battery.Method of the present invention is simple, is easy to industry and applies.
Description of drawings
Fig. 1 is native graphite and Delanium mixing back (mixed proportion is 6.5: 3.5) SEM figure, and wherein A, B, C, D are respectively and amplify 500 times, 1000 times, 2000 times, 4000 times images.
Fig. 2 is pure natural graphite SEM figure, and wherein A, B, C, D are respectively and amplify 500 times, 1000 times, 2000 times, 4000 times images.
Fig. 3 is pure Delanium SEM figure, and wherein A, B, C, D are respectively and amplify 500 times, 1000 times, 2000 times, 4000 times images.
Embodiment
Native graphite has the specific capacity height, charging and discharging curve is smooth and advantage such as cheapness, is a kind of desirable carbon negative electrode material of lithium ion cell, but it also exists that first charge-discharge efficiency is low, cycle performance is poor, to shortcomings such as electrolyte selectivity height.Delanium is than native graphite, though specific capacity is low slightly, it has the compacting height, to the good absorbing of electrolyte, and advantage such as compatible good and circulation is good with electrolyte.
The invention provides a kind of new negative material, native graphite and Delanium are pressed the different proportion mixing, proportioning was 6.1: 3.9～6.9: 3.1 (volume ratio).The use of this material is analysed lithium to the low temperature that improves electric core and has been played great effect, and has the advantage of Delanium and native graphite concurrently.After adopting special ratios of the present invention to mix, the D50 of material is between 16 μ m to 18 μ m, and such as the material that native graphite and Delanium mixed in 6.5: 3.5 by volume, its D50 is 17.12 μ m.And the D50 of normal most of graphite material is about 20 μ m.
Fig. 1 to Fig. 3 has listed the SEM image with (mixed proportion is 6.5: 3.5), pure natural graphite, pure Delanium after native graphite and the Delanium mixing of the present invention respectively, can see their roughly pattern difference from SEM.
Below by embodiment the present invention is described in further detail.
Embodiment 1
(positive electrode is pure cobalt acid lithium to adopt same positive electrode and electrolyte, electrolyte component is EC/DEC), with five kinds of negative materials (five kinds of doping ratios) and pure natural graphite and pure Delanium, all the other fill a prescription consistent, make the square electric core of same model, capacity is 650mAh.The electricity core is made finish back partial volume and aging 5d, tears electric core open at the full electricity of 5 ℃ of following 0.2C afterwards, and relatively each negative plate is analysed the lithium situation, and concrete outcome is as follows:
| Native graphite: Delanium | 1∶0 | 6.1∶3.9 | 6.3∶3.7 | 6.5∶3.5 | 6.7∶3.3 | 6.9∶3.1 | 0∶1 |
| Analyse the lithium situation | Seriously analyse lithium | Slightly analyse lithium | Analyse lithium a little | Do not analyse lithium | Analyse lithium a little | Slightly analyse lithium | Seriously analyse lithium |
Embodiment 2
(positive electrode is pure cobalt acid lithium to adopt same positive electrode and electrolyte, electrolyte component is EC/DEC), with five kinds of negative materials (five kinds of doping ratios) and pure natural graphite and pure Delanium, all the other fill a prescription consistent, make the square electric core of same model, capacity is 650mAh.The electricity core is made finish back partial volume and aging 5d, tears electric core open at the full electricity of 5 ℃ of following 1C afterwards, and relatively each negative plate is analysed the lithium situation, and concrete outcome is as follows:
| Native graphite: Delanium | 1∶0 | 6.1∶3.9 | 6.3∶3.7 | 6.5∶3.5 | 6.7∶3.3 | 6.9∶3.1 | 0∶1 |
| Analyse the lithium situation | Seriously analyse lithium | Slightly analyse lithium | Analyse lithium a little | Do not analyse lithium | Analyse lithium a little | Slightly analyse lithium | Seriously analyse lithium |
Embodiment 3
(positive electrode is pure cobalt acid lithium to adopt same positive electrode and electrolyte, electrolyte component is EC/DEC), with five kinds of negative materials (five kinds of doping ratios) and pure natural graphite and pure Delanium, all the other fill a prescription consistent, make the square electric core of same model, capacity is 650mAh.The electricity core is made finish back partial volume and aging 5d, tears electric core open at the full electricity of 10 ℃ of following 0.2C afterwards, and relatively each negative plate is analysed the lithium situation, and concrete outcome is as follows:
| Native graphite: Delanium | 1∶0 | 6.1∶3.9 | 6.3∶3.7 | 6.5∶3.5 | 6.7∶3.3 | 6.9∶3.1 | 0∶1 |
| Analyse the lithium situation | Seriously analyse lithium | Slightly analyse lithium | Analyse lithium a little | Do not analyse lithium | Analyse lithium a little | Slightly analyse lithium | Seriously analyse lithium |
Embodiment 4
(positive electrode is pure cobalt acid lithium to adopt same positive electrode and electrolyte, electrolyte component is EC/DEC), with five kinds of negative materials (five kinds of doping ratios) and pure natural graphite and pure Delanium, all the other fill a prescription consistent, make the square electric core of same model, capacity is 650mAh.The electricity core is made finish back partial volume and aging 5d, tears electric core open at the full electricity of 10 ℃ of following 1C afterwards, and relatively each negative plate is analysed the lithium situation, and concrete outcome is as follows:
| Native graphite: Delanium | 1∶0 | 6.1∶3.9 | 6.3∶3.7 | 6.5∶3.5 | 6.7∶3.3 | 6.9∶3.1 | 0∶1 |
| Analyse the lithium situation | Seriously analyse lithium | Slightly analyse lithium | Analyse lithium a little | Do not analyse lithium | Analyse lithium a little | Slightly analyse lithium | Seriously analyse lithium |
Conclusion:
More than analyze as can be known, in 6.1: 3.9～6.9: 3.1 these proportions, optimal proportion is 6.5: 3.5, and electric core is after low-temperature condition is torn electric core open, and the negative plate surface is golden yellow, does not have and analyses lithium, and performance is good.This point provides effective method and approach for improving the electric core lithium problem of analysing at low temperatures.
Above content be in conjunction with concrete execution mode to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. lithium ion battery negative material is characterized in that: described negative material comprises mixing of native graphite and Delanium, and native graphite shared volume ratio in both is 61%～69%.
2. lithium ion battery negative material according to claim 1 is characterized in that: native graphite shared volume ratio in both is 63%～67%.
3. lithium ion battery negative material according to claim 2 is characterized in that: native graphite shared volume ratio in both is 65%.
4. according to any described lithium ion battery negative material of claim 1～3, it is characterized in that: the mixed D50 of native graphite and Delanium is 16～18um.
5. lithium ion battery negative material preparation method, described method comprises: native graphite and Delanium are mixed as negative material, and native graphite shared volume ratio in both is 61%～69%.
6. lithium ion battery negative material preparation method according to claim 5 is characterized in that: native graphite shared volume ratio in both is 63%～67%.
7. lithium ion battery negative material preparation method according to claim 6 is characterized in that: native graphite shared volume ratio in both is 65%.
8. according to any described lithium ion battery negative material preparation method of claim 5～7, it is characterized in that: described with native graphite with after Delanium mixes, the D50 of composite material is 16～18um.
9. one kind is reduced the method that lithium ion battery negative material low temperature is analysed the lithium phenomenon, it is characterized in that: adopt any described method of claim 5～8 to prepare negative material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257713A (en) * | 2015-06-19 | 2016-12-28 | Sk新技术株式会社 | Secondary battery cathode and the lithium secondary battery being produced from |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481041A (en) * | 2002-07-31 | 2004-03-10 | ���µ�����ҵ��ʽ���� | Lithium secondary cell |
| CN1885598A (en) * | 2006-07-10 | 2006-12-27 | 深圳市贝特瑞电子材料有限公司 | Composite carbon negative electrode material of lithium ion power battery and its preparation method |
| CN1960052A (en) * | 2005-10-31 | 2007-05-09 | 比亚迪股份有限公司 | Lithium secondary battery, and preparation method |
| CN101192662A (en) * | 2006-11-30 | 2008-06-04 | 比亚迪股份有限公司 | Battery cathode and lithium ion secondary battery comprising same |
| JP2009026514A (en) * | 2007-07-18 | 2009-02-05 | Panasonic Corp | Nonaqueous electrolyte secondary battery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481041A (en) * | 2002-07-31 | 2004-03-10 | ���µ�����ҵ��ʽ���� | Lithium secondary cell |
| CN1960052A (en) * | 2005-10-31 | 2007-05-09 | 比亚迪股份有限公司 | Lithium secondary battery, and preparation method |
| CN1885598A (en) * | 2006-07-10 | 2006-12-27 | 深圳市贝特瑞电子材料有限公司 | Composite carbon negative electrode material of lithium ion power battery and its preparation method |
| CN101192662A (en) * | 2006-11-30 | 2008-06-04 | 比亚迪股份有限公司 | Battery cathode and lithium ion secondary battery comprising same |
| JP2009026514A (en) * | 2007-07-18 | 2009-02-05 | Panasonic Corp | Nonaqueous electrolyte secondary battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257713A (en) * | 2015-06-19 | 2016-12-28 | Sk新技术株式会社 | Secondary battery cathode and the lithium secondary battery being produced from |
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