High performance 3D-Li anodes with recycled and sustainably sourced carbon scaffolds

具有可回收和可持续来源的碳支架的高性能 3D-Li 阳极

• 批准号: 10079665
• 金额: $ 55.46万
• 依托单位: SIGMA LITHIUM LIMITED
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=10079665
• 关键词: performance; 3D; Li; anodes; recycled

Li-ion batteries are the most widely used rechargeable battery technologies in various scale application from small portable electronic devices, to electric vehicles and grid storage. Employing graphite as the anode material, they offer energy densities of ~100-265 Wh/kg. However, high energy densities (\>200 Wh/kg) are only reached at slow charge rates. Metallic Li is a superior anode offering significantly higher gravimetric/volumetric energy densities due to its low density and redox-potential. Additionally, the main processes during charge/discharge with Li metal anodes are Li deposition/stripping instead of Li intercalation/deintercalation which affect the overall kinetics. Hence, switching from conventional graphite anodes in Li-ion batteries to Li metal anodes offers a step-change in both mileage and charge/discharge rates for electric vehicles and can answer the demand for high energy and power applications.Sigma Lithium (SL) have developed an advanced 3D-Li anode battery technology which is inherently safer, cost-competitive, and exhibits higher specific energy/power densities against current state-of-the-art. SL's 3D-Li anode offers a lightweight, mechanically robust, and porous scaffold coated with Li, which increases the gravimetric/volumetric energy densities and enables the safe use of highly reactive Li by reducing local current densities. A platform solution, SL's innovative battery technology can be applied to multiple battery chemistries.SL are now working with Gen2Carbon to optimise the composition of the carbon fibre scaffold for improved battery performance, while creating a sustainable product from recycled carbon fibre materials which would otherwise have gone to landfill.

锂离子电池是在从小型便携式电子设备到电动汽车和电网存储的各种规模应用中使用最广泛的可充电电池技术。采用石墨作为阳极材料，它们提供约100-265 Wh/kg的能量密度。然而，高能量密度（>200 Wh/kg）仅在低充电速率下达到。金属Li是一种上级阳极，由于其低密度和氧化还原电位，提供显著更高的重量/体积能量密度。此外，在用Li金属阳极充电/放电期间的主要过程是Li沉积/剥离，而不是影响整体动力学的Li嵌入/脱嵌。因此，从锂离子电池中的传统石墨阳极切换到锂金属阳极，可为电动汽车提供里程和充电/放电速率的阶跃变化，并可满足高能量和功率应用的需求。Sigma Lithium（SL）开发了先进的3D-Li阳极电池技术，该技术具有固有的安全性，成本竞争力，并且相对于当前最先进的技术水平表现出更高的比能量/功率密度。SL的3D-Li阳极提供了一种轻质、机械坚固的、涂覆有Li的多孔支架，这增加了重量/体积能量密度，并通过降低局部电流密度使得能够安全使用高反应性Li。作为一种平台解决方案，SL的创新电池技术可应用于多种电池化学品。SL目前正在与Gen 2Carbon合作，优化碳纤维支架的成分，以提高电池性能，同时利用回收的碳纤维材料制造可持续产品，否则这些材料将被填埋。