Method using iodine solution to treat lithium surface and application of method to solid-state battery

A solid-state battery, metal lithium technology, used in lithium batteries, battery electrodes, secondary batteries, etc., can solve the problems of metal lithium instability, electrical contact loss, etc., and achieve the effect of good stability and compatibility

Inactive Publication Date: 2017-05-31
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the inorganic solid electrolytes are unstable to metallic lithium, and the dissolution and deposition of lithium in the solid-state battery system leads to the loss of electrical contact between the lithium anode layer and the electrolyte layer, which has a very adverse effect on the performance of the solid-state battery.

Method used

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  • Method using iodine solution to treat lithium surface and application of method to solid-state battery

Examples

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Embodiment 1

[0026] A method for treating the surface of metallic lithium with an iodine solution and its application in solid-state batteries. The assembly of solid-state batteries includes the preparation of surface-treated lithium metal electrodes, the preparation of composite solid electrolytes, the preparation of positive electrodes, and the assembly of solid-state batteries. The specific implementation process of iodine solution treatment metal lithium surface method and its application in solid-state battery is as follows:

[0027] 1. Preparation of lithium-boron alloy negative electrode treated with iodine:

[0028] The solute used in the preparation of the solution is iodine particles, and the solvent is tetrahydrofuran; the lithium negative electrode material used is a Li-B alloy sheet with a lithium content of 55%.

[0029] Concrete preparation steps are as follows:

[0030] a) Weigh 100 mg of iodine granules and place them in a reagent bottle, then add 4.9 g of tetrahydrofura...

Embodiment 2

[0051] A method for treating the surface of metallic lithium with an iodine solution and its application in solid-state batteries. The assembly of solid-state batteries includes the preparation of surface-treated lithium metal electrodes, the preparation of composite solid electrolytes, the preparation of positive electrodes, and the assembly of solid-state batteries. The specific implementation process of iodine solution treatment metal lithium surface method and its application in solid-state battery is as follows:

[0052] 1. Preparation of lithium-boron alloy negative electrode treated with iodine:

[0053] The preparation method is the same as that of the surface-treated lithium metal electrode used in Example 1.

[0054] 2. Preparation of composite electrolyte:

[0055] The organic component of the composite electrolyte uses PEO as a polymer with a molecular weight of 100,000. The solvent for dissolving PEO is THF, and the electrolyte is LiTFSI. The inorganic component...

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Abstract

The invention relates to a method using an iodine solution to treat a lithium surface and application of the method to a solid-state battery and belongs to the technical field of chemical power supplies. The method is characterized in that cathode materials used during lithium electrode production are pure lithium or boron alloy sheets and are cut and pressed into an electrode plate; a solvent for dissolving iodine is tetrahydrofuran, and the weight percentage concentration of the iodine solution is 0.5-30%; the electrode plate is submerged into the iodine solution, and residual liquid is dried through drying to obtain the surface-treated lithium cathode plate. The application of the method to the solid-state battery is characterized in that solid-state battery assembling includes preparing the surface-treated lithium cathode, preparing composite solid electrolyte, preparing an anode and assembling the solid-state battery, and the surface-treated lithium cathode preparation uses the method. The method is simple, evident in effect, applicable to the large-scale and batch processing of lithium cathode surfaces, and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a method for treating the surface of metal lithium with an iodine solution and its application in solid-state batteries. Background technique [0002] At present, metal lithium is the element with the smallest atomic weight (6.94) and the most negative standard electrode potential (-3.045V) among known metal elements, so when it is matched with an appropriate positive electrode material to form a battery, the battery will have the highest specific energy. , Excellent electrochemical performance at the highest voltage. However, there are serious low cycle efficiency and safety hazards in metal lithium batteries, which lead to the failure of its commercial application. In the early 1990s, Japan’s Sony Corporation introduced a lithium-ion battery with a lithium-intercalated carbon material as the negative electrode, which basically solved the above-mentioned problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/04H01M10/052H01M10/0562
CPCH01M4/049H01M4/1395H01M10/052H01M10/0562Y02E60/10
Inventor 钟海丁飞王春花徐志彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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