Longfei Cui, Shu Zhang, Jiangwei Ju, Tao Liu, Yue Zheng, Jiahao Xu, Yantao Wang, Jiedong Li, Jingwen Zhao, Jun Ma, Jinzhi Wang, Gaojie Xu, Ting-Shan Chan, Yu-Cheng Huang, Shu-Chih Haw, Jin-Ming Chen, Zhiwei Hu, Guanglei Cui
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引用次数: 0
摘要
全固态锂电池通常采用异质复合阴极,其中引入了导电添加剂以改善混合传导。这些电化学不活跃的添加剂与体积变化较大的层状氧化物阴极并不完全兼容,从而大大降低了电池的能量密度和循环寿命。在此,我们提出了一种阴极均匀化策略,即在整个(去)充电过程中冷压一种具有高效混合传导能力的零应变阴极材料。Li1.75Ti2(Ge0.25P0.75S3.8Se0.2)3具有相当高的锂+/电导率,完全充电时为0.22/242 mS cm-1,完全放电时单调增加到0.66/412 mS cm-1。它的比容量为 250 mAh g-1,体积变化率为 1.2%。由 100% Li1.75Ti2(Ge0.25P0.75S3.8Se0.2)3组成的均质正极使室温全固态锂电池在 2.5 摄氏度下的循环寿命超过 20,000 次,比容量保持率达 70%,在 0.1 摄氏度下的电池能量密度高达 390 Wh kg-1。这种阴极均匀化策略与传统的阴极异质设计形成鲜明对比,有可能提高全固态锂电池在商业应用中的可行性。
A cathode homogenization strategy for enabling long-cycle-life all-solid-state lithium batteries
All-solid-state lithium batteries typically employ heterogeneous composite cathodes where conductive additives are introduced to improve mixed conduction. These electrochemically inactive additives are not fully compatible with layered oxide cathodes that undergo large volume change, significantly reducing battery energy density and cycle life. Here we propose a cathode homogenization strategy by cold pressing a zero-strain cathode material with efficient mixed conduction throughout the (dis)charge process. Li1.75Ti2(Ge0.25P0.75S3.8Se0.2)3 possesses considerable Li+/electronic conductivity of 0.22/242 mS cm−1 when fully charged, increasing monotonically to 0.66/412 mS cm−1 when fully discharged. It delivers a specific capacity of 250 mAh g−1 and undergoes a 1.2% volume change. Homogeneous cathodes composed of 100% Li1.75Ti2(Ge0.25P0.75S3.8Se0.2)3 enable room-temperature all-solid-state lithium batteries to achieve a cycle life of over 20,000 cycles at 2.5 C with a specific capacity retention of 70% and a high energy density of 390 Wh kg−1 at the cell level at 0.1 C. This cathode homogenization strategy contrasts to the conventional cathode heterogeneous design, potentially improving the viability of all-solid-state lithium batteries for commercial applications. Solid-state lithium batteries typically utilize heterogeneous composite cathodes with conductive additives, which limit energy density and cycle life. Here the authors present a cathode material that exhibits efficient mixed conduction and near-zero volume change during cycling, thereby improving battery performance.
Nature EnergyEnergy-Energy Engineering and Power Technology
CiteScore
75.10
自引率
1.10%
发文量
193
期刊介绍:
Nature Energy is a monthly, online-only journal committed to showcasing the most impactful research on energy, covering everything from its generation and distribution to the societal implications of energy technologies and policies.
With a focus on exploring all facets of the ongoing energy discourse, Nature Energy delves into topics such as energy generation, storage, distribution, management, and the societal impacts of energy technologies and policies. Emphasizing studies that push the boundaries of knowledge and contribute to the development of next-generation solutions, the journal serves as a platform for the exchange of ideas among stakeholders at the forefront of the energy sector.
Maintaining the hallmark standards of the Nature brand, Nature Energy boasts a dedicated team of professional editors, a rigorous peer-review process, meticulous copy-editing and production, rapid publication times, and editorial independence.
In addition to original research articles, Nature Energy also publishes a range of content types, including Comments, Perspectives, Reviews, News & Views, Features, and Correspondence, covering a diverse array of disciplines relevant to the field of energy.