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

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-infiltrated 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 critical 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 chemical energy storage devices, lithium-ion batteries have the highest energy density (see, for example, Zu, C.-X. and H. Li, "Thermodynamic analysis on energy densities of batteries", Energy & Environmental Science 4(8): 2614-2624, 2011). Existing commercial lithium-ion batteries mainly include two types, one is lithium-ion battery using liquid electrolyte, and the other is lithium-ion battery using gel...

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 will increase significantly, and lead to attenuation of battery capacity (for example, references: Xu Xiaoxiong, Qiu Zhijun, etc., "Research Status and Prospects of All-Solid Lithium Battery Technology", "Energy Storage Science and Technology", 2(4), 2013)

[0010] To sum up, solid-state batteries have higher safety performance than batteries with liquid gel electrolytes, but at present, solid-state batteries are faced with high interface resistance, limited electrochemical window of polymer electrolytes, decreased polymer devitrification conductance and The volume expansion and contraction of electrode materials during charge and discharge limit the electrochemical performance of solid-state batteries such as rate performance and cycle performance.

In order to solve the low temperature safety, limited cycle life, narrow operating temperature, and limited operating voltage window of current commercial lithium-ion batteries, and to take advantage of the advantages of solid-state batteries, a new battery system must be proposed to solve the problems.

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