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Battery based on PCET reaction and energy storage method

A reaction and battery technology, applied in the field of electrochemical energy storage, can solve the problems of high-capacity battery system safety, unsuitable for micro and small energy storage systems, high requirements for element properties, etc., to improve power characteristics and capacity characteristics, operation High elasticity and avoid oxidative deactivation

Pending Publication Date: 2021-12-03
王昱飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, among the currently known electrochemical energy storage technologies, the application of lithium batteries in large-capacity battery systems is prone to safety problems. If the power balance is not well grasped, safety accidents such as fires and explosions are likely to occur.
When the fuel cell is discharged, it needs to use hydrogen as the raw material. However, even if the hydrogen is compressed to 70Mpa for storage, the mass of hydrogen still only accounts for 2-6% of the total mass. The difficulty of hydrogen storage is a problem facing the large-scale application of fuel cells.
For example, flow batteries such as vanadium batteries store electrical energy in solutions, which are very convenient for storage and transportation, but their energy density is low (<50Wh / kg), which is not suitable for micro energy storage systems
At the same time, the flow battery mainly stores and discharges energy based on the change of the valence state of the elements, which has high requirements on the properties of the elements. It must use expensive electrolyte and battery membrane components to meet the energy storage requirements, which greatly increases the cost of energy storage.
[0006] In the context of vigorous development of new clean energy represented by solar energy and wind energy, if these existing energy storage technologies cannot make further innovative breakthroughs, it will be difficult to become the mainstream route in the future, and there is an urgent need to develop new electrochemical energy storage technologies

Method used

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  • Battery based on PCET reaction and energy storage method
  • Battery based on PCET reaction and energy storage method
  • Battery based on PCET reaction and energy storage method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, a kind of battery based on PCET reaction, store energy through the solution of sodium formate and sodium carbonate / sodium bicarbonate, see figure 1 , including the positive electrode region 1, the negative electrode region 2 and the cation exchange membrane 3 separating the positive electrode region 1 and the negative electrode region 2, where "separation" means that in the solution of the positive electrode region 1, any molecule or ion will move The solution to the negative electrode area 2, or vice versa, must pass through the cation exchange membrane 3, which only allows cations to pass through, but can prevent anions from passing through.

[0039] The structural formula is The compound QH is used as the positive electrode electrocatalyst, the compound QH is dissolved in the mixed solution of 1,2 dichloroethane and n-butanol to obtain an organic solution with a compound QH concentration of 0.1mol / L, and the concentration of 0.3 is added to the organic...

Embodiment 2

[0063] Embodiment two, adopt structural formula as The compound QH is used as the positive electrode electrocatalyst, the compound QH is dissolved in the mixed solution of 1,2 dichloroethane and n-butanol to obtain an organic solution with a compound QH concentration of 0.1mol / L, and the concentration of 0.3 is added to the organic solution mol / L 1-butyl-3-methylimidazolium hexafluorosulfate ionic liquid was used as a supporting electrolyte. Configure the trisodium aminotrimethylene phosphate solution with a concentration of 0.5mol / L as the first salt solution, adjust the pH of the first salt solution to below 3, and circulate it into the positive electrode of the electrolytic cell together with the organic solution dissolved in compound QH Area.

[0064] The structural formula is Compound Q is used as the negative electrode electrocatalyst. Compound Q is dissolved in a mixed solution of 1,2 dichloroethane and n-butanol to obtain an organic solution with a compound Q conce...

Embodiment 3

[0067] Embodiment three, adopt structural formula as The compound QH is used as the positive electrode electrocatalyst, and the structural formula is Q as an anode electrocatalyst.

[0068] Other processes are the same as in Example 2.

[0069] In this example, the charging time is 1 hour, and the current density is 200A / m 2 , The average charging voltage is 0.80V, the current efficiency is 96%, and the energy storage time is 1 week. The discharge time is 1 hour, the average discharge voltage is 0.60V, and the current density is 200A / m 2 , The current efficiency is 99%, and the energy conversion efficiency is 71.3%.

[0070] In the above examples, saline solution is used as the energy storage material, and its market price in China does not exceed US$900 per ton (the exchange rate in October 2019, the same below). The raw material of the traditional liquid flow vanadium battery is vanadium pentoxide, and its market price in China is now close to 21,000 US dollars per to...

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Abstract

The invention discloses a battery based on PCET reaction. The battery comprises a positive electrode region, a negative electrode region and a cation exchange membrane for separating the positive electrode region from the negative electrode region, the positive electrode region comprises a positive electrode, a first salt solution and an organic solvent in which compounds Q and QH are dissolved, and the negative electrode region comprises a negative electrode, a second salt solution and an organic solvent in which compounds Q and QH are dissolved. The organic solvent is immiscible with the first salt solution and the second salt solution, and the pH value of the first salt solution is less than or equal to that of the second salt solution. The compounds Q and QH are compounds capable of being subjected to PCET reaction, Q is in an oxidation state, and QH is in a reduction state. The cost is low, and the energy storage efficiency, stability and safety are improved. The invention further discloses an energy storage method based on the PCET reaction, and the battery is adopted for energy storage.

Description

technical field [0001] The invention relates to electrochemical energy storage technology, in particular to a PCET reaction-based battery and an energy storage method. Background technique [0002] In the past two decades, new energy has developed rapidly around the world. The installed capacity of wind power has increased from 7.6GW to 469GW, and the installed capacity of photovoltaics has increased from 0.23GW to 301GW, respectively increasing by 60 times and 1284 times. It is estimated that by 2040, wind power and solar energy will account for the With 48% of the total installed capacity, solar and wind power will dominate the future power system. However, the volatility, discontinuity and instability of wind power, photovoltaic and other new energy power generation have caused huge hidden dangers to the safety and stable operation of the power grid. Serious abandonment of wind and light. For example, in 2016, China's total power of abandoning light, wind and water excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 王昱飞
Owner 王昱飞
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