CR927 battery

　　Research on lithium titanate hydrate technology for fast charge-discharge and stable cycle lithium-ion CR927 battery

　　Currently commonly used lithium-ion CR927 battery use organic electrolytes, and the electrolyte LiPF6 contained in them is a substance that is easily decomposed when exposed to water. Therefore, the traditional concept is that the electrode materials of lithium-ion CR927 battery need to be calcined at high temperatures to fully remove water. However, this will cause unavoidable side reactions such as particle agglomeration and grain coarsening in the material.

　　【Achievements Introduction】

　　On September 20, Nature Communications published a research paper titled "Lithium Titanate Hydrates with Superfast and Stable Cycling in Lithium Ion CR927 battery" online. This achievement focuses on the field of titanium-based energy storage materials. It reports a series of lithium titanate hydrates, which can be used in lithium-ion CR927 battery with ultra-long cycle life and high rate performance. It effectively expands the research scope of energy storage materials and provides electrode materials. New ideas for modification. The corresponding authors of the paper are Professor Tang Zilong from the School of Materials, Tsinghua University, Researcher Lu Jun from Argonne National Laboratory, and Professor Li Ju from the Massachusetts Institute of Technology. The first author is Wang Shitong, a 2012 doctoral student in the School of Materials, Tsinghua University.

　　[Highlights of this article]

　　The Li-H-Ti-O system material discovered by the research team is comparable to the excellent Li-Ti-O system and Ti-O system materials (including nanomaterials, doped and coated materials) currently reported at home and abroad. ratio, with comparable or even better electrochemical performance. As an electrode material containing "water", this type of lithium titanate hydrate can achieve stable cycles of tens of thousands of times in a high-voltage organic electrolyte system, which breaks people's traditional understanding. The so-called "crystal water" firmly bonded within the crystal of the material not only does not destroy the electrochemical performance of the electrode material in the organic electrolyte system, but promotes the diversity of crystal structures (such as two-dimensional layered) and the construction of nanocomposite materials , essentially improving the ion diffusion coefficient of the material.

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