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Lithium flow battery reactor and electrode suspension liquid lithium intercalated synthesis method

A technology of electrode suspension and flow battery, which is applied in the manufacture of regenerative fuel cells, non-aqueous electrolyte batteries, electrolyte batteries, etc., can solve the problems that hinder the subsequent use of lithium-ion flow batteries, decrease battery capacity, and reduce cycle life. Achieve the effects of avoiding the reaction of water vapor and oxygen, increasing energy density, and increasing the number of cycles

Active Publication Date: 2013-05-22
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the SEI film formed during the first charge and discharge process of the battery will consume part of the irreversible capacity, and the lithium ions in the anode will remain inside at the end of the battery discharge and cannot form an effective capacity. At this time, the positive electrode suspension and / or negative electrode suspension Due to insufficient lithium intercalation or a state of lithium deficiency after a period of circulation, the battery capacity will decrease and the cycle life will decrease, which hinders the subsequent use of lithium-ion flow batteries

Method used

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  • Lithium flow battery reactor and electrode suspension liquid lithium intercalated synthesis method
  • Lithium flow battery reactor and electrode suspension liquid lithium intercalated synthesis method
  • Lithium flow battery reactor and electrode suspension liquid lithium intercalated synthesis method

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Embodiment 1

[0041] In this embodiment, the positive electrode suspension used as the above-mentioned battery reactor is graphite electrode suspension.

[0042] The voltage change of lithium / graphite battery is relatively stable, and the reaction of lithium ion intercalation into graphite material mainly occurs below 0.2V. During the first charge and discharge process, there is an irreversible capacity loss of 15% to 20%, part of which is used for the initial lithium ions to react with organic solvents on the surface of the carbon to form an SEI film, and the other part is used to exfoliate the graphite structure Decomposition of solvents on the surface.

[0043] When the lithium flow battery reactor is working, the graphite electrode suspension enters from the positive electrode liquid inlet of the reaction tank, reacts with the lithium negative electrode in the reaction tank, and flows out from the positive electrode liquid outlet on the lower end of the reaction tank after the reaction ...

Embodiment 2

[0047] In this embodiment, the positive electrode suspension used as the above-mentioned battery reactor is a simple Si electrode suspension.

[0048] Silicon is one of the most abundant elements in the earth's crust, with a wide range of sources and cheap prices. Among the elements that can be alloyed to store lithium, the theoretical lithium storage capacity of silicon is more than 10 times that of graphite, and the voltage platform of silicon is slightly higher than that of graphite. It is difficult to cause lithium precipitation on the surface during charging, and the safety performance is high.

[0049] Silicon and lithium are combined to form Li 12 Si 7 , Li 7 Si 3 , Li 13 Si 4 and Li 22 Si 5 etc., where Li 22 Si 5 The corresponding lithium storage capacity reaches 4200mAh / g. When the lithium flow battery reactor is working, the silicon electrode suspension enters from the positive electrode liquid inlet of the reaction tank, reacts with the lithium negative el...

Embodiment 3

[0054] In the present embodiment, the positive electrode suspension used as the above-mentioned battery reactor is Li 4 Ti 5 o 12 electrode suspension.

[0055] Li 4 Ti 5 o 12 The spinel structure with defects can be written as Li[Li 1 / 3 Ti 5 / 3 ]O 4 . Li 4 Ti 5 o 12 With a three-dimensional diffusion channel for lithium ions, although the electronic conductivity is poor, it has a good Li + Ionic conductivity, exotic Li + The ions are embedded in the spinel structure, and the diffusion in the ion channel is carried out by vacancy transition or ion interstitial hopping. With Li + With the increase of ion intercalation, Li 4 Ti 5 o 12 gradually transforms from insulator to Li with good conductivity 7 Ti 5 o 12 , which can be written as Li 2 [Li 1 / 3 Ti 5 / 3 ]O 4 . Li 2 [Li 1 / 3 Ti 5 / 3 ]O 4 The electrical conductivity is good, the conductivity is about 10 -2 S / cm.

[0056] When the lithium flow battery reactor is working, Li 4 Ti 5 o 12 The electrode...

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Abstract

The invention discloses a lithium flow battery reactor and an electrode suspension liquid lithium intercalated synthesis method. The battery reactor is formed by fixing one or more assembled structures respectively consisting of a negative current collection core, a lithium negative electrode, a hollowed bushing, a porous diaphragm and a positive current collection core in a reaction tank. Lithium intercalation is performed on electrode suspension liquid by utilizing the battery reactor in an electrochemical synthesis way, the electrode suspension liquid is injected into the reaction tank, lithium ions which are separated from the lithium negative electrode in the reaction tank are finally intercalated into active material particles of the electrode suspension liquid, and the electrochemical synthesis process and the lithium intercalation degree of the electrode suspension liquid in the reaction tank are controlled by adjusting the flow rate, the voltage and the circular reaction times of the electrode suspension liquid. Due to the adoption of the method, a stable lithium-enriched electrode material or a metastable-phase lithium-containing alloy with high electric capacity can be obtained, and the energy density and the cycle life of a battery can be improved.

Description

technical field [0001] The invention belongs to chemical energy storage battery technology, in particular to a lithium liquid flow battery reactor and a method for electrochemically intercalating lithium into electrode suspensions using the battery reactor. Background technique [0002] Lithium-ion flow battery combines the advantages of lithium-ion battery and flow battery. It is a new chemical energy storage technology with independent output power and energy storage capacity, high energy density, and environmentally friendly and non-toxic electrolyte. The lithium-ion flow battery consists of a positive electrode suspension pool, a negative electrode suspension pool, a battery reactor, a liquid pump (or other power system) and a sealed pipeline. Wherein, the positive electrode suspension pool holds the mixture of positive electrode composite material particles (such as lithium iron phosphate composite material particles) and electrolyte, and the negative electrode suspensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M10/058
CPCY02E60/12Y02E60/528Y02E60/10Y02E60/50Y02P70/50
Inventor 陈永翀张艳萍冯彩梅韩立张萍王秋平
Owner BEIJING HAWAGA POWER STORAGE TECH
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