Quasi-solid Na-CO2 secondary battery and preparation method thereof

Abstract

The invention discloses a quasi-solid Na-CO2 secondary battery. The quasi-solid Na-CO2 secondary battery consists of a cathode piece, a quasi-solid polymer electrolyte membrane, an anode piece, a porous steel plate and an aluminium plastic composite membrane shell, wherein an anode is a carbon / sodium composite anode which pre-absorbs metal sodium; the cathode piece consists of a carbon material with a porous structure and a current collector; the quasi-solid polymer electrolyte membrane is positioned between an anode sodium piece and a cathode current collector, and is used for providing sodium ions and inhibiting the volatilization and leakage of an electrolyte; the electrolyte is a NaClO4 / tetraethylene glycol dimethyl ether solution which is infiltrated in a polymer membrane; the cathode piece, the quasi-solid polymer electrolyte membrane and the anode piece form a laminated structure and are integrally packaged in the aluminium plastic composite membrane shell. The quasi-solid Na-CO2 secondary battery has the advantages of protecting the anode, preventing electrolyte leakage, inhibiting the volatilization of the electrolyte, large capacity, chargeability under room temperature, environmental friendliness, low cost, long service life and the like; a preparation method for the quasi-solid Na-CO2 secondary battery is easy to operate, high in controllability and high in consistency, and is beneficial to large-scale production.

Description

technical field [0001] The invention relates to a novel secondary battery, in particular to a quasi-solid Na-CO 2 A secondary battery and a preparation method thereof belong to the fields of new energy technology and new chemical power sources. Background technique [0002] In the past century, carbon dioxide (CO2) produced by fossil fuel combustion and vehicle exhaust emissions 2 ) and other greenhouse gases have increased sharply year by year, and the atmospheric greenhouse effect has also increased. Energy experts predict that by 2030, global carbon dioxide (CO 2 ) emissions may exceed 38 billion tons, and the resulting greenhouse effect will seriously threaten human existence. However, from another perspective, CO 2 It is a very precious resource in the field of energy and chemical industry, although the current global CO 2 The utilization amount is less than 100 million tons, but the CO that turns waste into treasure 2 Utilizing new pathways is receiving increasin...

AI Technical Summary

Problems solved by technology

Due to Na-CO 2 The secondary battery uses a porous electrode, plus the characteristics of using metallic sodium as the negative electrode, Na-CO 2 The development of secondary batteries faces the following major technical bottlenecks: 1) Sodium is easy to form dendrites, and Na-CO 2 After the discharge reaction of the secondary battery is completed, the regenerated sodium metal will form a dendrite during the charging process. When the recharge is repeated to a certain extent, the dendrite growth will pierce the battery diaphragm, thereby causing a short circuit and seriously reducing the battery life. The performance of the battery may even be dangerous; 2) The problem of battery leakage, due to the porous structure of the positive side electrode, CO 2 Circulate through the pores, so that the electrolyte will also flow out of the pores. If the leakage problem cannot be solved properly, it will also give Na-CO 2 The performance of the secondary battery brings great problems, seriously affecting its performance and life

Limited to the hidden danger of dendrites in the metal sodium anode, the selection of electrolyte components and additives, the design of gas electrodes and the selection of catalysts, etc., Na-CO 2 Secondary batteries have never had a great breakthrough

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