CN207938727U - A kind of lithium ion battery of high-energy density - Google Patents
A kind of lithium ion battery of high-energy density Download PDFInfo
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- CN207938727U CN207938727U CN201820385824.9U CN201820385824U CN207938727U CN 207938727 U CN207938727 U CN 207938727U CN 201820385824 U CN201820385824 U CN 201820385824U CN 207938727 U CN207938727 U CN 207938727U
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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
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Abstract
The utility model discloses a kind of lithium ion batteries of high-energy density, including positive plate, diaphragm, negative plate, shell, electrolyte, the diaphragm is set between the positive plate and the negative plate, the positive plate, the diaphragm, the negative plate three winding is placed in the shell, the electrolyte is full of the shell, the positive plate includes plus plate current-collecting body and the positive-active layer coated on the plus plate current-collecting body surface, the negative plate uses copper foil current collector, the electrolyte includes lithium salts, solvent, additive, the lithium salts includes LiFSI, LiTFSI one of which.The utility model has the advantages that coordinating high-performance lithium salts as negative plate using copper foil current collector, mitigating the quality of negative plate, lithium battery quality is set to reduce, energy density improves, and ensures the cycle life and stability of lithium battery, simplify the process for preparing negative plate, save material, reduces production cost.
Description
Technical field
The utility model is related to field of lithium ion battery more particularly to a kind of lithium ion batteries of high-energy density.
Background technology
Lithium ion battery have specific capacity is high, self discharge is small, operating temperature range is wide, voltage platform is high, have extended cycle life,
Memory-less effect, it is environmentally friendly the advantages that, be widely used to the fields such as mobile phone, laptop, electric tool, and
Gradually promoted and applied in electric vehicle field.With the development of the progress and science and technology in epoch, the energy density of lithium ion battery is not
It is disconnected to improve, but cannot still meet lightweight, the market demand of long continuation of the journey.The cruising ability and weight energy of lithium ion battery
Metric density is always the direction that lithium ion battery is pursued, especially fast-developing power vehicle field, for high weight energy
The pursuit of density is even more extremely urgent.
Utility model content
Purpose of utility model：In view of the above-mentioned problems, the purpose of this utility model be to provide a kind of lithium of high-energy density from
Sub- battery, is improved negative plate and electrolyte, improves energy density.
Technical solution：
A kind of lithium ion battery of high-energy density, including positive plate, diaphragm, negative plate, shell, electrolyte, it is described every
Film is set between the positive plate and the negative plate, after the positive plate, the diaphragm, negative plate three winding
Be placed in the shell, the electrolyte be full of the shell, the positive plate include plus plate current-collecting body and coated on it is described just
The positive-active layer of pole collection liquid surface, the negative plate use copper foil current collector, the electrolyte to include lithium salts, solvent, add
It includes LiFSI, LiTFSI one of which to add agent, the lithium salts.Negative plate is not coated with only with copper foil current collector, surface
Negative electrode active layer mitigates the weight of negative plate, improves energy density.
Preferably, in order to extend the cycle life of battery, the lithium salts further includes LiBOB, LiODFB one of which.
Preferably, in order to improve the cycle performance of lithium battery, a concentration of 0.9~2.0mol/ of lithium salts in the electrolyte
L, the content of LiFSI or LiTFSI is 10~90% in the lithium salts.
Preferably, in order to stablize the cycle characteristics of battery, the additive includes acid anhydrides.
Specifically, the acid anhydrides is succinic anhydride or glutaric anhydride.
Specifically, the plus plate current-collecting body uses aluminum foil current collector, the positive-active layer to include positive active material, lead
Electric agent, binder, the positive active material are cobalt acid lithium, nickle cobalt lithium manganate, LiFePO 4 one of which.
Specifically, the solvent includes EC, PC, EMC, the ratio of the solvent is EC/PC/EMC=3:1:6.
Advantageous effect：Compared with prior art, the utility model has the advantages that using copper foil current collector as negative plate, match
High-performance lithium salts is closed, mitigates the quality of negative plate, lithium battery quality is made to reduce, energy density improves, and ensures the cycle of lithium battery
Service life and stability simplify the process for preparing negative plate, save material, and reduce production cost, improve production efficiency, are suitble to big
Scale promotes and applies.
Description of the drawings
Fig. 1 is positive/negative plate section schematic diagram after the completion of winding；
Fig. 2 is the structural schematic diagram of the lithium ion battery of high-energy density；
Fig. 3 is the cycle performance comparison diagram of embodiment 1, embodiment 2, embodiment 3；
Fig. 4 is the cycle performance comparison diagram of embodiment 1 and embodiment 4；
Fig. 5 is the cycle performance comparison diagram of embodiment 1 and embodiment 5；
Fig. 6 is the charge and discharge contrast curve of embodiment 1 and comparative example 1；
Fig. 7 is the cycle performance comparison diagram of embodiment 1 and comparative example 2；
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the utility model is furtherd elucidate, it should be understood that these embodiments are only used for
Illustrate the utility model rather than limitation the scope of the utility model, after having read the utility model, art technology
Personnel fall within the application range as defined in the appended claims to the modification of the various equivalent forms of the utility model.
Embodiment 1
A kind of lithium ion battery of high-energy density, including positive plate 1, diaphragm 2, negative plate 3, shell 4, electrolyte, aluminium
Lug 5, aluminium pole ears glue 6, nickel lug 7, nickel gel 8.Positive plate 1 is including plus plate current-collecting body and is coated on plus plate current-collecting body surface
Positive-active layer, plus plate current-collecting body use aluminum foil current collector, positive-active layer includes positive active material, conductive agent, bonding
Agent, positive active material select cobalt acid lithium.Negative plate 3 is using the copper foil current collector after electrolysis, calendering process.Electrolyte packet
Include lithium salts, solvent, additive, a concentration of 1.5mol/L of lithium salts, lithium salts are taken using LiFSI and LiBOB bi-components in electrolyte
Match, LiFSI：LiBOB=8:2, additive includes 3%PS, 0.5%VEC, 0.5%VC, 0.5% succinic anhydride, and solvent includes
The ratio of EC, PC, EMC, solvent are EC/PC/EMC=3:1:6.Aluminium pole ears 5 are fixed by aluminium pole ears glue 6 and positive plate 1, nickel pole
Ear 7 is fixed by nickel gel 8 and negative plate 3.Diaphragm 2 is set between positive plate 1 and negative plate 3, positive plate 1, diaphragm 2,
Sectional drawing after 3 three of negative plate winding is as shown in Figure 1, be integrally placed in shell 4, and electrolyte is full of shell 4, such as Fig. 2 institutes
Show.
The preparation method of the lithium ion battery of the high-energy density includes the following steps：
The making of step 1, positive plate：Plus plate current-collecting body uses aluminum foil current collector, positive active material to select cobalt acid lithium.It will
Positive active material, conductive agent, binder put into mixing plant respectively, after stirring, are coated on plus plate current-collecting body, roll
It later and is cut, cuts into fixed width；
The making of step 2, negative plate：Negative plate uses copper foil current collector, and is cut, and width is bigger than positive plate by 2~
4mm；
Step 3 fixes aluminium pole ears and positive plate by aluminium pole ears glue, and nickel lug is solid by nickel gel with negative plate
Fixed, positive plate, diaphragm, negative plate stack successively, and diaphragm is arranged between positive plate and negative plate, using volume needle by three
Volume together, complete to be placed in shell, is toasted by winding；
Step 4：Prepare electrolyte：Electrolyte includes lithium salts, solvent, additive, a concentration of 1.5mol/ of electrolyte lithium salts
L, lithium salts are arranged in pairs or groups using LiFSI and LiBOB bi-components, LiFSI：LiBOB=8:2, additive includes 0.5% VC, 0.5% fourth
Dicarboxylic anhydride, solvent include EC, PC, EMC, and the ratio of solvent is EC/PC/EMC=3:1:6.
Step 5：After the completion of step 3 baking, the prepared electrolyte in injection step 4 into shell, then be melted into, change
At vacuum degassing is carried out after the completion, finished battery is obtained.
Embodiment 2
The places different from embodiment 1 are that the lithium salts implemented in 1 is become LiFSI arranges in pairs or groups with LiODFB bi-components,
LiFSI：LiODFB=8:2, lithium salt is constant, and solvent is not also adjusted with additive.
Embodiment 3
The places different from embodiment 1 are that the lithium salts implemented in 1 is become LiTFSI arranges in pairs or groups with LiBOB bi-components,
LiTFSI：LiBOB=8:2, lithium salt is constant, and solvent is not also adjusted with additive.
Lines 1 are the cycle performance of lithium battery in embodiment 1 in Fig. 3, and lines 2 are the cyclicity of lithium battery in embodiment 2
Can, lines 3 are the cycle performance of lithium battery in embodiment 3, and two kinds of differences are used respectively in embodiment 1, embodiment 2, embodiment 3
High-performance lithium salts collocation, effect is almost the same, and using copper foil current collector as negative plate, lithium battery has certain cyclicity
Energy.The Mass lost of lithium battery cathode plate made from embodiment 1, embodiment 2, embodiment 3, lithium battery quality are reduced, energy
Density >=350Wh/kg.
Embodiment 4
The places different from embodiment 1 are, the lithium salts implemented in 1 is become LiFSI one pack systems, and lithium salt is constant,
Solvent is not also adjusted with additive.Fig. 4 is the cycle performance comparison diagram of embodiment 1 and embodiment 4, and lines 1 are embodiment in Fig. 4
The cycle performance of lithium battery in 1, lines 2 are the cycle performance of lithium battery in embodiment 4 in Fig. 4, by figure it is found that using single group
High-performance lithium salts, the cycle performance of lithium battery is divided to be not so good as two-component high-performance lithium salts.
Embodiment 5
Difference lies in remove the succinic anhydride in embodiment 1, other parts remain unchanged with embodiment 1.Fig. 5 is
The cycle performance comparison diagram of embodiment 1 and embodiment 5, lines 1 are the cycle performance of lithium battery in embodiment 1 in Fig. 5, in Fig. 5
Lines 2 are the cycle performance of lithium battery in embodiment 5, and anhydride additive is beneficial to the cycle performance of lithium battery, in embodiment 5
Anhydride additive is not added, lithium battery cycle deteriorates.
Comparative example 1
Difference lies in negative plates with embodiment 1：After cathode graphite, conductive agent, binder are stirred evenly, re-coating exists
Copper foil current collector surface.Fig. 6 is the charge and discharge contrast curve of embodiment 1 and comparative example 1, and lines 1 is in embodiments 1 in Fig. 6
The charging curve of lithium battery, lines 2 are the discharge curve of lithium battery in embodiment 1 in Fig. 6, and lines 3 are in comparative example 1 in Fig. 6
The charging curve of lithium battery, lines 4 are the discharge curve of lithium battery in comparative example 1 in Fig. 6, it will be appreciated from fig. 6 that making in embodiment 1
Use copper foil current collector as negative material, charge-discharge performance is preferable, and discharge platform is higher.
Comparative example 2
Difference lies in become LiPF6 one pack systems, lithium salt is constant, molten by the lithium salts in embodiment 1 with embodiment 1
Agent is not also adjusted with additive.Fig. 7 is the cycle performance comparison diagram of embodiment 1 and comparative example 2, and lines 1 are embodiment 1 in Fig. 7
The cycle performance of middle lithium battery, lines 2 are the cycle performance of lithium battery in comparative example 2 in Fig. 7, use other business lithium salts
LiPF6, lithium battery cycle performance are deteriorated.
In conclusion the utility model is used using copper foil current collector as negative plate, coordinate two-component high-performance lithium salts
Combination and anhydride additive alleviate the matter of negative plate on the basis of ensureing the cycle life and stability of lithium battery
Amount, makes lithium battery quality reduce, and energy density improves, and simplifies the process for preparing negative plate, saves material, reduction is produced into
This, improves production efficiency, is suitble to large-scale promotion application.
Claims (7)
1. a kind of lithium ion battery of high-energy density, it is characterised in that：Including positive plate (1), diaphragm (2), negative plate (3),
Shell (4), electrolyte, the diaphragm (2) are set between the positive plate (1) and the negative plate (3), the positive plate
(1), the diaphragm (2), the negative plate (3) three's winding are placed in the shell (4), and the electrolyte is full of described
Shell (4), the positive plate (1) include plus plate current-collecting body and the positive-active layer coated on the plus plate current-collecting body surface, institute
It includes lithium salts, solvent, additive to state negative plate (3) and use copper foil current collector, the electrolyte, the lithium salts include LiFSI,
LiTFSI one of which.
2. a kind of lithium ion battery of high-energy density according to claim 1, it is characterised in that：The lithium salts further includes
LiBOB, LiODFB one of which.
3. a kind of lithium ion battery of high-energy density according to claim 2, it is characterised in that：Lithium in the electrolyte
A concentration of 0.9~2.0mol/L of salt, the content of LiFSI or LiTFSI is 10~90% in the lithium salts.
4. a kind of lithium ion battery of high-energy density according to any one of claim 1-2, it is characterised in that：Institute
It includes acid anhydrides to state additive.
5. a kind of lithium ion battery of high-energy density according to claim 4, it is characterised in that：The acid anhydrides is fourth two
Acid anhydrides or glutaric anhydride.
6. a kind of lithium ion battery of high-energy density according to claim 1, it is characterised in that：The plus plate current-collecting body
Using aluminum foil current collector, the positive-active layer includes positive active material, conductive agent, binder, the positive active material
For cobalt acid lithium, nickle cobalt lithium manganate, LiFePO 4 one of which.
7. a kind of lithium ion battery of high-energy density according to claim 1, it is characterised in that：The solvent includes
The ratio of EC, PC, EMC, the solvent are EC/PC/EMC=3:1:6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820385824.9U CN207938727U (en) | 2018-03-21 | 2018-03-21 | A kind of lithium ion battery of high-energy density |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820385824.9U CN207938727U (en) | 2018-03-21 | 2018-03-21 | A kind of lithium ion battery of high-energy density |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108461808A (en) * | 2018-03-21 | 2018-08-28 | 上海力信能源科技有限责任公司 | A kind of lithium ion battery of high-energy density and preparation method thereof |
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2018
- 2018-03-21 CN CN201820385824.9U patent/CN207938727U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108461808A (en) * | 2018-03-21 | 2018-08-28 | 上海力信能源科技有限责任公司 | A kind of lithium ion battery of high-energy density and preparation method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220629 Address after: 2 Dagang Dashan Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province Patentee after: ETRUST POWER Group Ltd. Address before: No. 4571, Cao'an Road, Jiading District, Shanghai, 201804 Patentee before: SHANGHAI LIXIN ENERGY TECHNOLOGY CO.,LTD. |
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| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 2 Dagang Dashan Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province Patentee after: Lixin (Jiangsu) Energy Technology Co.,Ltd. Address before: 2 Dagang Dashan Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province Patentee before: ETRUST POWER Group Ltd. |
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| CP01 | Change in the name or title of a patent holder |