Battery

Abstract

The invention discloses a battery. The battery comprises an anode, a cathode and an electrolyte solution. The anode comprises an anode current collector and an anode active material which undergoes an electrochemical reaction and can realize reversible release of an embedded ion. The cathode at least comprises a cathode current collector. The electrolyte solution comprises at least one solvent which can dissolve electrolytes and ionize the electrolytes, and the electrolytes can be ionized into at least one type of active ions which can undergo a reduction-deposition reaction and an oxidation-dissolution reaction at the cathode in a charge-discharge process. A porous layer or a graphene layer is formed on the surface of the cathode and the porous layer has micron scale, submicron scale or nanoscale apertures. The battery can be operated safely, has a low production cost, a long service life and good cycling performances, and can be used as a substitute of an energy storage system and a lead acid battery in the field of large-scale energy storage.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a battery. Background technique [0002] The widespread use of new energy by human beings has led to the rapid expansion of the secondary battery market. In the current new energy system, the requirements for secondary batteries are ubiquitous. Whether it is electric vehicles, wind energy, solar grid connection or grid peak shaving, there is an urgent need for a cheap, reliable, safe and long-life secondary battery. The secondary batteries currently developed are mainly concentrated in lithium-ion batteries, high-temperature sodium-sulfur batteries, sodium-nickel-chloride batteries and vanadium flow batteries. These batteries have their own advantages, such as long life and high energy density of lithium-ion batteries and high-temperature sodium-sulfur batteries, and vanadium redox flow batteries have theoretically unlimited life. But no matter what ki...

AI Technical Summary

Problems solved by technology

But no matter what kind of battery, it is impossible to meet the requirements of cheapness, reliability, safety and long life at the same time

Traditional lithium-ion batteries are too expensive and have potential safety hazards; high-temperature sodium-sulfur battery manufacturing technology threshold is high, and the price is expensive; many technical bottlenecks of vanadium redox flow batteries have not yet been broken through, etc.

[0003] For this reason, many researchers are committed to the research of aqueous lithium-ion batteries, hoping to greatly reduce the cost of lithium-ion batteries and improve safety, and some LiMn-based lithium-ion batteries have been proposed. 2 o 4 As the positive electrode, vanadium oxides such as LiV 3 o 8 etc. are negative electrodes and water is the electrolyte, but the poor stability of such negative electrodes in charging and discharging in water and the certain toxicity of vanadium limit the development of such batteries.

So far, the structures of the proposed aqueous lithium-ion secondary batteries have not been able to get rid of the structure based on the lithium ion extraction-intercalation principle, such as the reported VO 2 / LiMn 2 o 4 , LiV 3 o 8 / LiNi 0.81 co 0.19 o 2 , TiP 2 o 7 / LiMn 2 o 4 , LiTi 2 (PO 4 ) 3 / LiMn 2 o 4 , LiV 3 o 8 / LiCoO 2 Wait

Images