The demand for 3C products and electric vehicles is increasing day by day, so there is an urgent need to develop high-capacity batteries. A study by Northwestern University (NU) in the United States found that it can improveHigh capacity lithium batteryStable materials, this breakthrough is expected to more than double the battery life of mobile phones and electric vehicles.
Christopher Wolverton, professor of materials engineering at the School of Engineering and Applied Science at Northwestern University, said that the lithium manganese oxide electrode has the highest capacity of all transition metal oxide electrodes. Its capacity is twice that of today's mobile phone and laptop batteries, stabilizing such high capacity. Characteristics will enable future automotive lithium-ion battery performance to improve dramatically.
In a lithium battery, lithium ions will continuously travel back and forth between the cathode and the anode. The cathode is made of lithium ions, transition metals and oxides. When the lithium ions reach the cathode and return to the anode, transition metals such as cobalt will be stored. and releases electrical energy, while the cathode capacity is limited by the number of electrons in the transition metal,Oxygen is key to high battery capacity.
A French research team first proposed a high-capacity lithium-manganese oxide battery in 2016, using cheaper manganese metal to replace the traditional and expensive cobalt to develop a lower-cost, higher-capacity electrode. However, although the battery has a high capacity electrode, but it is not long-lasting, and the battery performance drops significantly in the first two charge and discharge cycles. Therefore, the researchers believe that the battery cannot yet be commercialized, and they cannot know exactly why the electrode capacity is relatively high and the rapid degradation factors.
After studying the cathode atom picture in detail, Wolverton's team discovered the mystery of the cathode's high capacity - the material forces oxygen to participate in the reaction. Therefore, in addition to the transition metal, the electrode also uses oxygen to store electrical energy and discharge. This makes the battery more convenient. Has higher capacity and can utilize more lithium ions.
After figuring out the reason behind the high capacity of the electrode, the team began to study how to stabilize the battery. Zhenpeng Yao, a team member and the first author of the paper, pointed out that the research relied on various charging knowledge and high-throughput operations to analyze and scan the periodic table of elements. Use new methods to synthesize compounds and potential elements, and find the key to improving battery performance.
The research calculation results point directly to chromium and vanadium metals. The team believes that by mixing this element with lithium manganese oxide, a stable compound can be produced to maintain the high capacity of the electrode. In the future, the Wolverton team will further test these theoretical compounds. Currently, the research Published in Science Advances greater than .
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