CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2018 Mar;30(9). doi: 10.1002/adma.201705575. Epub 2018 Jan 15.
Electrochemical energy storage devices with a high energy density are an important technology in modern society, especially for electric vehicles. The most effective approach to improve the energy density of batteries is to search for high-capacity electrode materials. According to the concept of energy quality, a high-voltage battery delivers a highly useful energy, thus providing a new insight to improve energy density. Based on this concept, a novel and successful strategy to increase the energy density and energy quality by increasing the discharge voltage of cathode materials and preserving high capacity is proposed. The proposal is realized in high-capacity Li-rich cathode materials. The average discharge voltage is increased from 3.5 to 3.8 V by increasing the nickel content and applying a simple after-treatment, and the specific energy is improved from 912 to 1033 Wh kg . The current work provides an insightful universal principle for developing, designing, and screening electrode materials for high energy density and energy quality.
电化学储能器件具有高能量密度，是现代社会的一项重要技术，尤其对于电动汽车而言。提高电池能量密度最有效的方法是寻找高容量的电极材料。根据能量质量的概念，高压电池提供了非常有用的能量，从而为提高能量密度提供了新的思路。基于这一概念，提出了一种通过提高正极材料的放电电压和保持高容量来提高能量密度和能量质量的新颖而成功的策略。该建议在高容量富锂正极材料中得到了实现。通过增加镍含量并采用简单的后处理，平均放电电压从 3.5 V 提高到 3.8 V，比能量从 912 Wh kg 提高到 1033 Wh kg 。目前的工作为开发、设计和筛选具有高能量密度和能量质量的电极材料提供了一个有见地的通用原则。
