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Passivation lithium powder and preparing method thereof, positive electrode material with addition of passivation lithium powder and battery

A positive electrode material and lithium passivation technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as battery performance hazards, failures, and impacts on battery performance, and achieve large-scale commercial applications and high energy density. Effect

Active Publication Date: 2016-07-13
BYD CO LTD
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Problems solved by technology

More importantly, lithium-ion batteries have extremely high requirements on the purity of various materials, and the above-mentioned methods of supplementing lithium cause great harm to battery performance due to the impurities produced by the solvents used and the by-products of organic lithium reactions.
In the patent CN101522343, FMC Corporation of the United States uses paraffin wax on the surface of lithium powder particles to protect lithium powder from being oxidized rapidly by air, but this type of stabilized lithium powder sold by FMC Corporation is completely ineffective in about 2 hours in the air
However, in the entire commercial battery preparation process, such as pulping, coating, drying, slitting, rolling, rolling, etc., 2 hours is not enough to complete the entire battery production process, so this method is only suitable for small batches in the laboratory Experiment, and the paraffin on the surface of lithium powder seriously affects the performance of the battery

Method used

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  • Passivation lithium powder and preparing method thereof, positive electrode material with addition of passivation lithium powder and battery
  • Passivation lithium powder and preparing method thereof, positive electrode material with addition of passivation lithium powder and battery
  • Passivation lithium powder and preparing method thereof, positive electrode material with addition of passivation lithium powder and battery

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preparation example Construction

[0018] The present invention also provides a preparation method of passivated lithium powder, comprising:

[0019] (1) Metal lithium is added to the first solvent under an inert atmosphere, the first solvent and metal lithium do not react, heated until the metal lithium melts, stirred to disperse the molten metal lithium, cleaned and dried after cooling, to obtain lithium powder particles.

[0020] (2) Under an inert atmosphere, the metal salt is added in the second solvent to obtain a solution, the second solvent does not react with lithium metal, the lithium powder particles obtained in step (1) are added to the solution, and the lithium powder particles react with the metal salt In situ reduction reaction, the reaction product is washed and dried to obtain passivated lithium powder.

[0021] Preferably, the reaction time in the step (2) is 1-60min. By controlling the reaction time, a dense metal layer can be coated on the surface of the lithium powder particles. By control...

Embodiment 1

[0036](1) Add 25g of battery-grade lithium powder particles into 250mL of mineral oil, and the reaction is carried out in a stainless steel reactor, which is sealed and protected by argon. Heat the above reaction solution to 180°C, and apply slow stirring at a speed of 100rpm during the heating process, until the lithium powder particles are completely dissolved; when the temperature rises to 180°C and the lithium is completely dissolved, increase the stirring speed to 10000rpm, and stir for 10 minutes, The heating device was removed, and the reaction vessel was placed in a mixture of ice and water. While maintaining high-speed stirring, the reaction liquid in the vessel was rapidly cooled. When the temperature of the reaction solution drops to room temperature, stop stirring, filter the reaction solution, separate, and wash with hexane for 4 times, then dry it in a positive air drying oven at 45°C for 2 hours and take it out for use;

[0037] (2) 15.00gCu(CF 3 SO 3 ) 2 Dis...

Embodiment 2

[0039] Different from Example 1, 12.00gCu(ClO 4 ) 2 Dissolve in 100g EC, add the prepared EC+Cu(ClO 4 ) 2 In the mixed solution, after stirring for 15 minutes, the copper-coated lithium powder was separated, washed by DEC three times, and then dried in an argon atmosphere. The whole process was carried out in an argon atmosphere to obtain passivated lithium powder A2.

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Abstract

The invention provides a passivation lithium powder and a preparing method thereof, a positive electrode material with addition of the passivation lithium powder and a battery; the passivation lithium powder includes lithium powder particles and a metal layer coating the surface of the lithium powder particles; a metal in the metal layer comprises one or more of copper, nickel, iron, zinc, lead, silver, cadmium and cobalt, and the standard electrode potential of the metal in the metal layer is in a range of -0.7 to 1.3 V. The passivation lithium powder provided by the invention can make the lithium powder particles stably exist in air for a long time. The passivation lithium powder is added to the positive electrode material of the battery, so the purpose of lithium supplement can be controllable to achieve, and the prepared battery has relatively high energy density.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a passivated lithium powder and a preparation method thereof, a positive electrode material and a battery added with the passivated lithium powder. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite. During the process of intercalating and removing lithium, the volume change of graphite is small, so it has good cycle performance. However, since the lithium intercalation potential of the graphite negative electrode is lower than the reduction potential of the electrolyte solvents PC, EC, DEC, etc., the solvent will be reduced during the charging process to form a solid electrolyte film (SEI) on the surface of the negative electrode. In this process, not only electrons...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395
CPCY02E60/10
Inventor 韩晓燕李世彩
Owner BYD CO LTD
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