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INVENTION
Russian Federation Patent RU2242825
LITHIUM (Li / SO 2) batteries
Name of the inventor: Pleshakov MS (RU); Belonenko SA (RU); Yalyushev NI (RU)
The name of the patentee: Engineering Company Ltd. "Orion HIT"
Address for correspondence: 346410, Rostov region, Novocherkassk, st.. Mayakovsky, 32, Engineering firm "Orion HIT", MS Pleshakova
Starting date of the patent: 2242825
The invention relates to electrical industry and can be used in the manufacture of Li / SO 2 battery.
The technical result of the invention is to increase the explosion Li / SO 2 battery, increasing its resources, and the suppression of dendritoobrazovaniya process on the lithium electrode surface. According to the invention the surface of the separator facing the anode, causing the separation layer 40-60 microns thick, which is composed of 90-95 wt% colloidal graphite and fluoroplastic solution -. 5.10 wt%, based on dry residue..
DESCRIPTION OF THE INVENTION
The invention relates to electrical industry and can be used in the manufacture of Li / SO2 battery.
Known invention (Lithium Ion Getter electrode and improved electrochemical cell containing the same: Pat 5,006,428 US MKI 5 H 01 M 2/16 / Gocbel Franz Hossain Sohrab; Yardney Technical Product, Inc. - №442033; declaring 23.11..... 89; Publ 04/09/91;. NKI 429/101) to prevent damage to the battery with a lithium anode, due to dendrite growth during charge and overcharge (0.9 M in thionyl LiAlCL 4) proposes to use a getter electrode is placed between cathode and anode and insulated from these electrodes steklovoylochnymi separators. The getter steklovoylochnoy electrode is made of paper with a thin layer of graphite with a mixture of coal and acts as a cathode with a relatively low current density. Reaches getter electrode dissolve the dendrites, the life of a lithium battery is substantially increased and retained its capacity.
However, studies have shown that the use described in the application, the getter electrode in lithium batteries, leads to substantial loss of self-discharge and battery capacity.
Known lithium battery (prototype), where the anode surface is treated electronically conductive particulate carbonaceous coating which not only promotes the formation of stable passivation layer and inhibits the occurrence of dendrite but also reduces the interfacial resistance, maintaining it at this level during the entire battery life. (Discontinuous surface of the electrode in a lithium battery Particulate interface for electrolytic cells and electrolytic process : Pat 5503946, MKI H 04 M 4/62 / Fauteux Denis G., Shi Jic, Gary Richard; Arthur D. Little, Inc. №314878;.. 29.09.1994 stated;. Publ 04/02/1996;. NKI 429/50).
However, the use described in the so-coated anode patent does not lead to the formation of a stable passivating layer and inhibits dendrite formation process to the extent that would satisfy the requirements for lithium batteries. Studies have shown that the coating of the composition of which is given in the patent, characterized by fragility. Peeling occurred carbon coating on the surface of the lithium electrode and the dendrites formed on the surface of lithium opened, completely destroyed the applied layer of carbon material. Dendrites destroyed separator, a short circuit occurs, and battery models were destroyed by the explosion.
Before the authors had a task to increase the explosion Li / SO2 battery, increasing its resources by forming a stable passivation layer and suppression dendritoobrazovaniya process on the lithium electrode surface.
This problem is solved in that on the separator surface facing the anode, coated separator layer 40-60 microns thick, consisting of graphite of 90-95 wt.% Of a colloidal solution and polytetrafluorethylene 5-10 wt.%, On a dry residue.
The invention consists in the fact that the dendrites formed on the surface of the lithium electrode are short-circuited at the separation layer, which is deposited on the surface of the separator facing the lithium electrode. As a result of this interaction on the surface of the lithium electrode forms a stable passivating layer that prevents dendritoobrazovaniya process. Introduced into the separating layer the binder (polytetrafluorethylene colloidal solution) firmly holds it on the surface of the separator and gives it a good plastic properties. The thickness of 40-60 microns due to the strength characteristics of the separation layer. With a thickness of less than 40 microns, the spacer layer does not have the desired strength characteristics and does not fulfill its function during the entire battery life. The thickness of the spacer layer 60 micrometers impractical because This leads to thickening of the electrodes and does not block the positive effect furthermore, that was obtained when the thickness of the spacer layer 60 microns. When exposed to the separation layer of dendrites in the initial moment of cycling and increasing-decreasing electrode thickness of the block (the effect of "breathing") during the subsequent cycling does not affect the separation layer, it does not crack and does not peel off from the surface of the separator, and performs its functions for the duration of battery life.
SUMMARY OF THE INVENTION
For the manufacture of the separation layer using colloidal graphite grade C-1 and PTFE colloidal solution (water-alcohol suspension of PTFE) brand F4-D BSKHIT mark separator. Prepared solution of graphite in aqueous suspension in PTFE alcohol ratio used. 90-95 wt% graphite and fluoroplastic hydroalcoholic suspension - 5-10% by weight of dry residue.. The solution was applied by spraying onto the surface of the separator is not annealed to form a layer 40-60 microns thick. Separators were dried at a temperature of 100 ± 5 ° C for 1 hour and annealed at a temperature of 280-300 ° C for 5-10 minutes.
Example
For the tests was collected 4 Series R6 size batteries of laboratory specimens (3 pieces in each series) and particulate lithium electrodes, a two-layer separator and the electrolyte BSKHIT Li-AlCl 4 ·
nSO 2 (n is from 3 to 9).
Tests were carried out on an automatic charge-discharge stand. The charge and discharge current density of 1 mA / cm 2.
Test results of batteries layouts depending on the number and thickness of the graphite layer separation in the table.
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Tests have shown that the proposed composition and thickness of the spacer layer allow for explosion and significantly extend the life of batteries. The examples given composition and thickness of the spacer layer in accordance with the features set forth in the claims, and a test battery assembled with separator coated with a separating layer, confirm the possibility of practical realization of the claimed invention with the achievement of the said technical result. Based on the above it can be concluded according to the claimed invention, the criterion of "industrial applicability". Thus, the above prior art analysis allows us to affirm that we have the claimed combination of essential features set forth in the claims, is not known, that meets one of the criteria - "novelty." |
Study of technical solutions in order to identify essential features of our invention, coincident with the prototype features found that contact the claimed invention should not be clearly to those skilled in the art from the prior art. We believe that the proposed solution meets the criterion of "inventive step".
Based on the above, we believe that our proposed technical solution can be found to the present invention and protected by the patent of the Russian Federation.
CLAIM
Li / SO 2 battery comprising an anode, a separator, a cathode, and an electrolyte separating layer of a carbon material, characterized in that the separating layer 40-60 microns thick deposited on the surface of the separator facing the anode, and consists of a graphite - 90-95 wt .% and a PTFE colloidal solution of 5-10 wt.% dry residue.
print version
Publication date 05.11.2006gg
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