CN102340025A - Lithium ion battery and production method thereof - Google Patents
Lithium ion battery and production method thereof Download PDFInfo
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- CN102340025A CN102340025A CN2010102316937A CN201010231693A CN102340025A CN 102340025 A CN102340025 A CN 102340025A CN 2010102316937 A CN2010102316937 A CN 2010102316937A CN 201010231693 A CN201010231693 A CN 201010231693A CN 102340025 A CN102340025 A CN 102340025A
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- ion battery
- lithium ion
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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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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a lithium ion battery, comprising an anode and a cathode, wherein, the anode mixed material comprises lithium cobalt oxide and a ternary material as main ingredients, and the cathode mixed material comprises modified natural graphite and artificial graphite as main ingredients. According to the invention, the battery is designed by improving the formula of the anode material and cathode material of the lithium ion battery existing in the prior art, the battery capacity is effectively improved, and simultaneously the battery cost is reduced.
Description
Technical field
The present invention relates to a kind of lithium ion battery and manufacturing approach thereof.
Background technology
The digital product that moves at present uses lithium ion battery more, and along with the continuous development and the technology of digital technology are integrated, it is increasingly high to the battery request that power supply energy is provided, and needs longer standby and service time.Though the energy density of lithium ion battery has exceeded much than secondary cells such as ni-mhs, in actual use, also still there is the problem of off-capacity.
Present lithium ion cell positive uses cobalt acid lithium more, ternary material or spinelle manganic acid lithium material, in the voltage range of 3.0～4.2V, the specific capacity of cobalt acid lithium probably about 142mAh/g, compacted density about 3.9; The specific capacity of ternary material probably about 152mAh/g, compacted density about 3.6; The specific capacity of spinel lithium manganate probably about 110mAh/g, compacted density about 3.0; Above material is along with the increase of granularity, and compacted density can promote, but can reduce the specific capacity performance of material accordingly; The simple energy density from material sees that the energy density of cobalt acid lithium material is the highest relatively.Mostly the negative material that uses in the lithium ion battery is graphite material, and what energy density was higher at present is the Delanium of modified natural graphite and high compacting.Modified natural graphite has good processing characteristics and very high specific capacity, but compacted density is lower; The Delanium of high compacting has high compaction capacity and very high specific capacity, but processing characteristics is relatively poor.
Therefore, prior art awaits improving and development.
Summary of the invention
Problem to be solved by this invention is to provide a kind of lithium ion battery, promotes existing capacity of lithium ion battery.
In order to solve the problems of the technologies described above, technical scheme of the present invention is following:
A kind of lithium ion battery comprises positive pole and negative pole, and wherein, said positive pole comprises cobalt acid lithium and ternary material.
Described lithium ion battery, wherein, the weight ratio of said cobalt acid lithium and ternary material is 0.25～4.0.
Described lithium ion battery, wherein, the granularity D50 of said cobalt acid lithium is 4～8 μ m, D10 >=1.5 μ m; The granularity D50 of ternary material is 11～15 μ m, D10 >=5.0 μ m.
Described lithium ion battery, wherein, said negative pole comprises modified natural graphite and Delanium.
Described lithium ion battery, wherein, the weight ratio of said modified natural graphite and Delanium is 0.1～1.0.
Described lithium ion battery, wherein, said lithium ion battery is flexible packing lithium ion battery, polymer Li-ion battery or liquid lithium ionic cell.
A kind of manufacturing approach of described lithium ion battery wherein, is used mechanical system to do respectively and is mixed before said positive pole and the said cathode blending.
The manufacturing approach of described lithium ion battery, wherein, said mechanical system is a ball milling.
The manufacturing approach of described lithium ion battery, wherein, the manufacturing of said positive pole may further comprise the steps: the positive electrode ball milling do to mix, makes glue and batch mixing, is coated with, rolls sheet, section is cut, cuts in blocks.
The manufacturing approach of described lithium ion battery, wherein, the manufacturing of said negative pole may further comprise the steps: the negative material ball milling do to mix, makes glue and batch mixing, is coated with, rolls sheet, section is cut, cuts in blocks.
Adopt such scheme, the present invention designs battery through the prescription that improves existing lithium ion battery positive and negative electrode material, can effectively promote battery capacity, reduces the battery cost simultaneously.
Description of drawings
Fig. 1 is the positive plate compacted density sketch map of different materials;
Fig. 2 is positive plate of the present invention, negative plate manufacturing flow chart;
Fig. 3 is the 0.2C discharge curve of three kinds of scheme electricity cores in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, further explain is done in preferred embodiment of the present invention.
The present invention a kind ofly uses anodal composite material and negative pole composite material to arrange in pairs or groups to promote the method for capacity of lithium ion battery;
Anodal composite material Main Ingredients and Appearance among the present invention is cobalt acid lithium and ternary material, and negative pole composite material Main Ingredients and Appearance is modified natural graphite and Delanium;
The weight proportion of cobalt acid lithium and ternary material can be 0.25～4.0 in this anodal composite material; Wherein the granularity D50 of cobalt acid lithium material is controlled at 4～8 μ m, D10 >=1.5 μ m; The granularity D50 of ternary material is controlled at 11～15 μ m, D10 >=5.0 μ m;
The weight proportion of modified natural graphite and Delanium can be 0.1～1.0 in this negative pole composite material;
Wherein anodal composite material and negative pole composite material all need use ball milling to do the processing before the mode of mixing is prepared burden.
As shown in Figure 1, ternary material and the compacted density of cobalt acid lithium under equal rolling condition are different, even same material also receives the influence of its granule size, varigrained cobalt acid lithium compacted density has obvious difference under equal rolling condition.Simultaneously, the granularity materials with smaller can be filled between the oarse-grained gap, so; Cobalt acid lithium is mixed with ternary material; Through regulating the proportioning of granularity and mixing, under particle size distribution that is fit to and weight proportion, the mixing ratio capacity performance of cobalt acid lithium and ternary material can be near ternary material; Compacted density is near cobalt acid lithium, and the energy density of composite material can be higher than independent use cobalt acid lithium or use ternary material separately.
Modified natural graphite that is fit to and the collocation of high compacting Delanium can effectively improve the compaction capacity of native graphite down, make the energy density of mixing negative pole be higher than independent use any material wherein.Sneak into modified natural graphite simultaneously and can promote the processing characteristics of high compacting Delanium, as shown in table 1 below, incorporating modified native graphite can prolong the sedimentation time of slurry in high compacting Delanium, improves the caking property of pole piece.
The different negative material slurries of table 1. viscosity in time changes
The film-making technological process of positive/negative plate
As shown in Figure 2, prepare the both positive and negative polarity raw material by weight proportion after, positive/negative plate carries out film-making according to following steps respectively:
The positive electrode ball milling do to mix, anodally make glue and batch mixing, be coated with, roll sheet, section is cut, cuts in blocks;
The negative material ball milling do to mix, negative pole is made glue and batch mixing, be coated with, roll sheet, section is cut, cut in flakes.
Adopt above-mentioned positive/negative plate to carry out the making of lithium ion battery, can promote the capacity of battery under the same model.
Embodiment
Battery types: flexible package polymer lithium ion battery electric pond model: 044261
The prescription of according to the form below 2,3 prepares the positive pole and the negative pole (wherein percentage all refers to percentage by weight) of three kinds of schemes (A, B, C) respectively.
Table 2. anode formula and scheme
The D10 of cobalt acid lithium is 1.85 μ m in the above material, and D50 is 7.46 μ m, and the D10 of ternary material is 5.2 μ m, and D50 is 12.5 μ m, wherein, nickel, cobalt, the ratio of manganese is 5: 3: 2.
Table 3. cathode formula
Carry out the preparation of positive/negative plate according to the technological process of both positive and negative polarity pole piece and the relevant parameter of this battery size pole piece;
Behind the preparation positive/negative plate, three layers of barrier film that barrier film uses outer polypropylene/intermediate layer polyethylene to constitute, it is that EC (ethylene carbonate), DEC (diethyl carbonate), DMC (dimethyl carbonate), EMC (methyl ethyl carbonate) and electrolyte are the solution of LiPF6 (lithium hexafluoro phosphate) that electrolyte adopts organic solvent; Battery structure adopts winding method, carries out lug spot welding by Soft Roll poly-lithium battery manufacture craft flow process, reels; Fluid injection; Preliminary filling, two envelopes, continuous filling obtains the finished product battery.
The battery that three schemes are made respectively carries out performance test, and its capacity comparison is as shown in table 4 below.
The capacity comparison of three scheme batteries of table 4.
From above data; The Soft Roll lithium ion battery of same model; Battery capacity under the design of employing scheme C and energy density all can promote than preceding traditional independent use cobalt acid lithium or ternary material to some extent; Concrete, the discharge curve of three kinds of conceptual design batteries is as shown in Figure 3, can see that the discharge capacity of the cell of scheme C is compared all lifting to some extent with option A, B.
Adjustment is anodal, the ratio of negative material, and like 5 of following tables, when positive and negative electrode used composite material of the present invention, its battery performance can obtain certain lifting.
Other battery schemes of table 5.
Method of the present invention can be applicable to flexible packing lithium ion battery, polymer Li-ion battery, liquid lithium ionic cell etc.Through test, through the capacity of lithium ion battery lifting 1.5～3.8% of the inventive method preparation; Energy density promotes 2.1～7.0%.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (10)
1. a lithium ion battery comprises positive pole and negative pole, it is characterized in that, said positive pole comprises cobalt acid lithium and ternary material.
2. lithium ion battery according to claim 1 is characterized in that, the weight ratio of said cobalt acid lithium and ternary material is 0.25～4.0.
3. lithium ion battery according to claim 1 is characterized in that, the granularity D50 of said cobalt acid lithium is 4～8 μ m, D10 >=1.5 μ m; The granularity D50 of ternary material is 11～15 μ m, D10 >=5.0 μ m.
4. according to the described lithium ion battery of arbitrary claim in the claim 1 to 3, it is characterized in that said negative pole comprises modified natural graphite and Delanium.
5. lithium ion battery according to claim 4 is characterized in that, the weight ratio of said modified natural graphite and Delanium is 0.1～1.0.
6. lithium ion battery according to claim 5 is characterized in that, said lithium ion battery is flexible packing lithium ion battery, polymer Li-ion battery or liquid lithium ionic cell.
7. the manufacturing approach of a lithium ion battery according to claim 5 is characterized in that, uses mechanical system to do before said positive pole and the said cathode blending respectively and mixes.
8. the manufacturing approach of lithium ion battery according to claim 7 is characterized in that, said mechanical system is a ball milling.
9. the manufacturing approach of lithium ion battery according to claim 8 is characterized in that, the manufacturing of said positive pole may further comprise the steps: the positive electrode ball milling do to mix, makes glue and batch mixing, is coated with, rolls sheet, section is cut, cuts in blocks.
10. the manufacturing approach of lithium ion battery according to claim 8 is characterized in that, the manufacturing of said negative pole may further comprise the steps: the negative material ball milling do to mix, makes glue and batch mixing, is coated with, rolls sheet, section is cut, cuts in blocks.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794784A (en) * | 2012-10-31 | 2014-05-14 | 宁波科博特钴镍有限公司 | Preparation method of lithium ion battery cathode material |
| CN108172825A (en) * | 2017-12-07 | 2018-06-15 | 格林美（无锡）能源材料有限公司 | Real inexpensive lithium cobaltate cathode material of a kind of high voltage and preparation method thereof |
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| CN101667659A (en) * | 2009-09-16 | 2010-03-10 | 保定风帆新能源有限公司 | Lithium ion battery core |
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| CN103794784A (en) * | 2012-10-31 | 2014-05-14 | 宁波科博特钴镍有限公司 | Preparation method of lithium ion battery cathode material |
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| CN108172825A (en) * | 2017-12-07 | 2018-06-15 | 格林美（无锡）能源材料有限公司 | Real inexpensive lithium cobaltate cathode material of a kind of high voltage and preparation method thereof |
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Application publication date: 20120201 |