CN105652214A - Evaluation method of interface between lithium ion battery anodes and electrolytes - Google Patents
Evaluation method of interface between lithium ion battery anodes and electrolytes Download PDFInfo
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- CN105652214A CN105652214A CN201610187085.8A CN201610187085A CN105652214A CN 105652214 A CN105652214 A CN 105652214A CN 201610187085 A CN201610187085 A CN 201610187085A CN 105652214 A CN105652214 A CN 105652214A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
Abstract
The invention provides an evaluation method of an interface between lithium ion battery anodes and electrolytes. The method comprises the steps that a certain batch of anode plates with one face coated are selected, a certain electrolyte is adopted, and the anode plates are assembled into symmetric batteries; after standing is conducted for a period of time, a constant current is applied to the symmetric batteries, and circulating performance testing is conducted; a changing curve of polarizing voltage of the symmetric battery with testing time is drawn; the stability of an SEI membrane formed on the interface of the batch of the anode plates and the electrolyte and the compatibility of active materials of the batch of the anode plates and the electrolyte are analyzed and judged; the same batch of the anode plates with the one side coated are selected, a different electrolyte is adopted, the anode plates are assembled into symmetric batteries, and the steps are repeatedly conducted. According to the evaluation method of the interface between the lithium ion battery anodes and the electrolytes, not only can the stability of the SEI membrane formed on the interface of the battery anodes and the electrolytes be effectively evaluated, but also the compatibility of the anode active materials and the electrolytes can be effectively evaluated, and meanwhile shortening of the screening time of the electrolytes is facilitated.
Description
Technical field
The present invention relates to lithium ion battery detection technique field, specifically the evaluation methodology of a kind of lithium ion battery negative and electrolyte interface.
Background technology
In liquid lithium ionic cell first charge-discharge process, electrode material and electrolyte react on solid phase/liquid interface, form one layer of passivation layer being covered in electrode material surface. This passivation layer is a kind of boundary layer, there is the feature of solid electrolyte, be electronic body but it is the excellence conductor of Li+, Li+ can pass through this passivation layer and freely embeds and deviate from, therefore this layer of passivating film is referred to as " solid electrolyte interface film " (solidelectrolyteinterface), is called for short SEI film.
The performance on electrode material that formed of SEI film produces vital impact. On the one hand, the formation of SEI film consumes part lithium ion so that first charge-discharge irreversible capacity increases, and reduces the efficiency for charge-discharge of electrode material; On the other hand, it is insoluble that SEI film has organic solvent, energy stable existence in organic electrolyte solution, and solvent molecule can not pass through this layer of passivating film, it is thus possible to effectively prevent the common embedding of solvent molecule, avoid and embed the destruction that electrode material is caused because of solvent molecule altogether, thus substantially increase cycle performance and the service life of electrode.
More about the research of the formation mechenism of SEI film, constituent at present, but the evaluation methodology about SEI membrane stability is less, detection means about negative active core-shell material Yu the compatibility of electrolyte is also less, and the new method therefore probing into out a kind of effective evaluation lithium ion battery negative and electrolyte interface has very strong realistic meaning.
Summary of the invention
It is an object of the invention to provide the evaluation methodology of a kind of lithium ion battery negative and electrolyte interface, it is judged that the stability of the SEI film that lithium ion battery negative is formed and the compatibility of negative active core-shell material and electrolyte with electrolyte interface.
The technical scheme is that
A kind of lithium ion battery negative and the evaluation methodology of electrolyte interface, adopt Symmetrical cells cycle performance method of testing, comprise the following steps:
(1) choose a certain batch of cathode pole piece of one side coating, adopt certain electrolyte, be assembled into Symmetrical cells;
(2), after standing a period of time, apply a constant current to described Symmetrical cells, at certain test temperature, be circulated performance test according to default deposition dissolution time;
(3) polarizing voltage change curve with the testing time of described Symmetrical cells is drawn;
(4) according to the polarizing voltage of the described Symmetrical cells change curve with the testing time, stability and the active material of this batch of cathode pole piece to the SEI film that this batch of cathode pole piece is formed with this kind of electrolyte interface are analyzed judging with the compatibility of this kind of electrolyte;
(5) choose same batch of cathode pole piece of one side coating, adopt other different types of electrolyte, be assembled into Symmetrical cells, repeat the above steps (2)��(4).
The evaluation methodology of described lithium ion battery negative and electrolyte interface, also include: the stability of SEI film formed by relatively same batch of cathode pole piece and variety classes electrolyte interface and the compatibility of the active material of same batch of cathode pole piece and variety classes electrolyte, electrolyte is screened.
The evaluation methodology of described lithium ion battery negative and electrolyte interface, in step (1), described Symmetrical cells is CR2016 type button Symmetrical cells.
The evaluation methodology of described lithium ion battery negative and electrolyte interface, in step (2), the density of described constant current is 0.1��0.5mA cm-2��
The evaluation methodology of described lithium ion battery negative and electrolyte interface, in step (2), described test temperature is 25��65 DEG C.
The evaluation methodology of described lithium ion battery negative and electrolyte interface, in step (2), described deposition dissolution time is 2��15h.
The invention have the benefit that
As shown from the above technical solution, the present invention can not only evaluate the stability of the SEI film that battery cathode is formed with electrolyte interface effectively, can also effectively evaluate the compatibility of negative active core-shell material and electrolyte, be simultaneously also beneficial to shorten the screening time of electrolyte.
Accompanying drawing explanation
Fig. 1 be in embodiments of the invention 1 battery polarization voltage with the change curve of testing time;
Fig. 2 be in embodiments of the invention 2 battery polarization voltage with the change curve of testing time.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Embodiment 1:
Lithium ion battery production line selects the cathode pole piece of a certain batch of one side coating, adopts electrolyte A, be assembled into CR2016 type button Symmetrical cells; After standing a period of time, this Symmetrical cells is applied density is 0.25mA cm-2Constant current, test temperature is 25 DEG C, and deposition dissolution time is 6h, is circulated performance test, the variation tendency of analysis polarizing voltage.
Note: Symmetrical cells refers to two duplicate batteries of pole piece; Deposition dissolution time refers to the time of charge and discharge cycles of experience.
As it is shown in figure 1, along with the prolongation of testing time, the polarizing voltage of this Symmetrical cells tends towards stability, stationary value is 30mV. Constantly depositing dissolution along with lithium metal, have Li dendrite in this process and formed, the Li dendrite of formation easily propagates through barrier film and causes Symmetrical cells short circuit. After this Symmetrical cells has circulated 196h, it can be seen that voltage is 0V, illustrate that this Symmetrical cells is short-circuit.
Embodiment 2:
Select the cathode pole piece of same batch of one side coating, adopt electrolyte B, be assembled into CR2016 type button Symmetrical cells; After standing a period of time, this Symmetrical cells is applied density is 0.25mA cm-2Constant current, test temperature is 25 DEG C, and deposition dissolution time is 15h, is circulated performance test, the variation tendency of analysis polarizing voltage.
As in figure 2 it is shown, within the loop test time of 600h, the polarizing voltage of this Symmetrical cells is stable at 5mV. This Symmetrical cells is under more stringent condition, in the polarization process of continuous more than 1200h, does not still see that short circuit phenomenon occurs, but polarizing voltage increases to about 50mV from 5mV. Comparing with Fig. 1 it can be seen that cathode pole piece is better with the interface stability of electrolyte B, the compatibility is also more preferably.
The above embodiment is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention are determined.
Claims (6)
1. the evaluation methodology of a lithium ion battery negative and electrolyte interface, it is characterised in that adopt Symmetrical cells cycle performance method of testing, comprise the following steps:
(1) choose a certain batch of cathode pole piece of one side coating, adopt certain electrolyte, be assembled into Symmetrical cells;
(2), after standing a period of time, apply a constant current to described Symmetrical cells, at certain test temperature, be circulated performance test according to default deposition dissolution time;
(3) polarizing voltage change curve with the testing time of described Symmetrical cells is drawn;
(4) according to the polarizing voltage of the described Symmetrical cells change curve with the testing time, stability and the active material of this batch of cathode pole piece to the SEI film that this batch of cathode pole piece is formed with this kind of electrolyte interface are analyzed judging with the compatibility of this kind of electrolyte;
(5) choose same batch of cathode pole piece of one side coating, adopt other different types of electrolyte, be assembled into Symmetrical cells, repeat the above steps (2)��(4).
2. the evaluation methodology of lithium ion battery negative according to claim 1 and electrolyte interface, it is characterized in that, also include: the stability of SEI film formed by relatively same batch of cathode pole piece and variety classes electrolyte interface and the compatibility of the active material of same batch of cathode pole piece and variety classes electrolyte, electrolyte is screened.
3. the evaluation methodology of lithium ion battery negative according to claim 1 and electrolyte interface, it is characterised in that in step (1), described Symmetrical cells is CR2016 type button Symmetrical cells.
4. the evaluation methodology of lithium ion battery negative according to claim 1 and electrolyte interface, it is characterised in that in step (2), the density of described constant current is 0.1��0.5mA cm-2��
5. the evaluation methodology of lithium ion battery negative according to claim 1 and electrolyte interface, it is characterised in that in step (2), described test temperature is 25��65 DEG C.
6. the evaluation methodology of lithium ion battery negative according to claim 1 and electrolyte interface, it is characterised in that in step (2), described deposition dissolution time is 2��15h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229545A (en) * | 2016-09-19 | 2016-12-14 | 中国电子科技集团公司第十八研究所 | Electrocapillary infiltration method of battery electrolyte |
| CN106597312A (en) * | 2016-12-28 | 2017-04-26 | 深圳天珑无线科技有限公司 | Method and device for judging SEI stability of lithium ion battery |
| CN108508067A (en) * | 2018-02-11 | 2018-09-07 | 多氟多（焦作）新能源科技有限公司 | A method of evaluating the battery material of lithium ion battery using Symmetrical cells |
| CN108680865A (en) * | 2018-05-18 | 2018-10-19 | 力神动力电池***有限公司 | A kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance |
| CN108680866A (en) * | 2018-05-18 | 2018-10-19 | 力神动力电池***有限公司 | A kind of detection method of lithium rechargeable battery cycle performance |
| CN113945853A (en) * | 2021-08-04 | 2022-01-18 | 惠州锂威新能源科技有限公司 | Method for detecting stability of battery SEI film |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229545A (en) * | 2016-09-19 | 2016-12-14 | 中国电子科技集团公司第十八研究所 | Electrocapillary infiltration method of battery electrolyte |
| CN106597312A (en) * | 2016-12-28 | 2017-04-26 | 深圳天珑无线科技有限公司 | Method and device for judging SEI stability of lithium ion battery |
| CN108508067A (en) * | 2018-02-11 | 2018-09-07 | 多氟多（焦作）新能源科技有限公司 | A method of evaluating the battery material of lithium ion battery using Symmetrical cells |
| CN108680865A (en) * | 2018-05-18 | 2018-10-19 | 力神动力电池***有限公司 | A kind of detection method of electrolyte solution for lithium ion secondary battery cycle performance |
| CN108680866A (en) * | 2018-05-18 | 2018-10-19 | 力神动力电池***有限公司 | A kind of detection method of lithium rechargeable battery cycle performance |
| CN108680866B (en) * | 2018-05-18 | 2020-10-30 | 力神动力电池***有限公司 | Method for detecting cycle performance of lithium ion secondary battery |
| CN108680865B (en) * | 2018-05-18 | 2020-10-30 | 力神动力电池***有限公司 | Method for detecting circulation performance of electrolyte for lithium ion secondary battery |
| CN113945853A (en) * | 2021-08-04 | 2022-01-18 | 惠州锂威新能源科技有限公司 | Method for detecting stability of battery SEI film |
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Application publication date: 20160608 |