An interface infiltrated quasi-solid alkali metal cell, electrodes of the cell and a preparing method of the cell

An alkali metal battery, quasi-solid-state technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, lithium batteries, etc., can solve the problems of battery capacity decay, limited operating temperature of polymer batteries, and decreased electrolyte conductivity.

Active Publication Date: 2016-03-02
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the polymer electrolyte has high ionic conductivity only above the glass transition temperature, the working temperature of the polymer battery is limited. In addition, the currently commonly used PEO polymer electrolyte stable with metal lithium has a narrow electrochemical window. Therefore, the all-solid-state battery of PEO polymer cannot use high-voltage electrode materials, which limits the output voltage and energy density of the battery.
In addition, because the polymer electrolyte will gradually crystallize during long-term use, resulting in a decrease in electrolyte conductivity, the cycle performance of polymer all-solid-state batteries is poor.
In addition, for all-solid-state batteries with inorganic solid electrolytes and polymer all-solid-state batteries, due to the volume shrinkage and expansion of electrode materials during charge and discharge, the contact between electrode active material particles and conductive current collectors and electrolyte materials becomes poor. , the internal resistance of the battery

Method used

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  • An interface infiltrated quasi-solid alkali metal cell, electrodes of the cell and a preparing method of the cell
  • An interface infiltrated quasi-solid alkali metal cell, electrodes of the cell and a preparing method of the cell
  • An interface infiltrated quasi-solid alkali metal cell, electrodes of the cell and a preparing method of the cell

Examples

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Embodiment 1

[0073] This embodiment provides a quasi-solid-state lithium battery that can be infiltrated in a wide temperature range, wide voltage window, and interface. The battery number is C1. The battery composition includes: a positive electrode layer, an electrolyte layer, and a negative electrode layer. The battery structure is a three-layer laminated structure. The positive electrode layer includes a positive electrode active material, a positive electrode inorganic additive, a positive electrode polymer additive, and a positive electrode interfacial wetting additive. The positive active material is LiCoO 2 , with a mass fraction of 85%. The positive inorganic additive is conductive carbon black with a mass fraction of 5%. The positive polymer additive is PVDF with a mass fraction of 5%. The positive electrode interfacial wetting additive is lithium (fluorosulfonyl) (perfluorobutylsulfonyl) imide (Li[N(SO 2 F)(SO 2 C 4 f 9 )], LiFNFSI) and potassium (fluorosulfonyl) (perfluo...

Embodiment 2

[0084] This embodiment provides a quasi-solid lithium battery that can be infiltrated in a wide temperature range, wide voltage window, and interface, and the battery number is C2. The difference from Example 1 is that different positive electrode interface wetting additives and negative electrode interface additives are used, and the preparation processes of the positive electrode sheet and the negative electrode sheet are also different. The positive interface wetting additive used is LiPF 6 - PC-EC-TTFP solution (where LiPF 6 The concentration is 1mol / L, the content of TTFP is 5wt%, and it is liquid at room temperature), and the negative electrode interface wetting additive used is LiPF 6 - PC-EC-TTFP solution (where LiPF 6 The concentration is 1mol / L, the content of TTFP is 5wt%, and it is liquid at room temperature).

[0085] The preparation process of the positive layer electrode sheet: using NMP as a solvent, mix the positive active material, inorganic additives, and...

Embodiment 3

[0089] This embodiment provides a quasi-solid lithium battery that can be infiltrated at the interface of a wide temperature range and a wide voltage window, and the battery number is C3. The difference from Example 1 is that the electrolyte layer uses a polymer solid electrolyte, and the composition of the polymer solid electrolyte is LiClO 4 -PEO (where PEO and LiClO 4 The molar ratio is 10:1).

[0090] Preparation process of polymer electrolyte: weighing 1molPEO and 0.1molLiClO 4 Dissolve in 50ml of NMP solution, stir for 2 hours until it is fully dissolved, pour the solution into a rectangular PVDF tank with a size of 10cm×10cm and a depth of 1mm, place it in a vacuum oven at 50°C for 48 hours, and dry to obtain a polymer solid electrolyte membrane.

[0091] The full battery C3 obtained in this embodiment can work normally at a temperature range of 65-85° C., with a cell capacity of 1 Ah, and a charging and discharging voltage range of 3-4 V.

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Abstract

An interface infiltrated quasi-solid alkali metal cell is provided by the invention and comprises a cathode layer, an anode layer and an electrolyte layer. The electrolyte layer is a solid electrolyte. The cathode layer and/or the anode layer comprise electrode active compounds and an interface infiltrating additive. The interface infiltrating additive is of a liquid state in a work temperature range, can conduct ions and can infiltrate the electrode active compounds and the solid electrolyte. Electrodes of the cell and a preparing method of the cell are also provided by the invention. The cell is high in safety characteristics and wide in voltage window and can work in a wide temperature range.

Description

technical field [0001] The invention relates to an alkali metal battery, in particular to an interface-wetting quasi-solid alkali metal battery, a battery electrode and a battery preparation method. Background technique [0002] In recent years, with the development of mobile communication equipment, electric vehicles, and the demand for grid energy storage and small energy storage, it is very important to develop batteries that can be used in a wide temperature range, have high safety, high energy density and power density . [0003] Among various commercial rechargeable and dischargeable chemical energy storage devices, lithium-ion batteries have the highest energy density (for example, refer to literature Zu, C.-X. 2011). Existing commercial lithium-ion batteries mainly include two types, one is a lithium-ion battery using a liquid electrolyte, and the other is a lithium-ion battery using a gel electrolyte. Liquid electrolytes are lithium salts dissolved in organic sol...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M10/052H01M4/139
CPCY02E60/10
Inventor 王少飞张舒吴娇杨李泓陈立泉
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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