Chinese team developed Li-N2 rechargeable battery to improve curing energy efficiency by using reversible reaction

According to foreign media reports, nitrogen is considered to be one of the important sources of renewable energy because it is extremely rich in the atmosphere. However, due to its atomic structure, the nitrogen atomic structure is difficult to break under normal conditions, which is a great challenge for scientists who want to convert atomic bonds into electrical energy.

Today, Chinese researchers have developed a lithium-nitrogen (Li-N-) rechargeable battery, the principle of which is the reversible reaction of 6Li+N–? The use of 2Li–N. The battery system consists of a lithium battery anode (Lianode), an ether-based sedelectrolyte, and a carbon cloth cathode. The battery has a Faraday efficiency of 59%.

The "proof-of-concept" design was published in the journal Chem to provide electricity to current lithium-nitrogen batteries through reverse chemical reactions. The Li-N2 battery of the research institute can operate in atmospheric nitrogen under ambient temperature conditions, unlike the energy generated by decomposing the nitrogen lithium compound (2Li3N) into lithium and nitrogen, thereby obtaining a chemical reaction. A lithium nitrogen compound is formed upon reaction with lithium production. Compared to other lithium metal batteries, the energy output time is shorter.

The structure and regeability of the Li-N2 battery are as follows: Figure (A) Li-N2 battery structure diagram, containing lithium metal foil anode (Li-foilanode), ether-based electrolyte and Common cathode (CCcathode). Figure (B): N2 fixation curves (blue) and N2 evolution curves (red) of a Li-N2 battery with a common cathode at a current density of 0.05 mA/cm2. Figure (C): Control point curve (CVcurves) of Li-N2 batteries in a nitrogen-saturated atmosphere (black) and an argon-saturated atmosphere (red) at a scanning frequency of 0.05 mV/s. Figure (D): Cyclic performance of Li-N2 battery at a current density of 0.05 mA/cm2.

The research team has demonstrated that this Li-N2 battery can be charged at room temperature and atmospheric temperature, involving reversible battery reactions (reversiblebatteryreactions):

(Chemical Equation 1) Anode: 6Li? 6Li++6e?

(Chemical Equation 2) Cathode: 6Li++N2+6e? ? 2Li3N

(Chemical Formula 3) Overall: 6Li++N2?2Li3N

The research team investigated the use of two composite cathodes, the common cathode (Ru-CC) and the zirconium dioxide common cathode (ZrO2-CC), to improve the energy efficiency of nitrogen curing. Li-N2 batteries with cathode catalysts have higher curing energy efficiency than the original common cathode (pristine CCcathodes).

The study funded by the Ministry of Science and Technology, The People's Republic of China (MinistryofScienceandTechnologyofChina) and the National Natural Science Foundation of China (NationalNaturalScienceFoundationofChina).

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