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首页> 外文期刊>Journal of Energy Storage >Fast-charging to a partial state of charge in lithium-ion batteries: A comparative ageing study
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Fast-charging to a partial state of charge in lithium-ion batteries: A comparative ageing study

机译：锂离子电池快速充电至部分充电状态：比较老化研究

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摘要

At electric vehicle fast-charging stations, it is generally recommended to avoid charging beyond ∼80% State-of-Charge (SOC) since topping-off to full capacity disproportionately increases the charging time. This necessitates studying its long-term impact compared to slower rate charging to full capacity typical of home or residential charging. Here we present the long-term ageing effects on commercial 18650 NMC-LMO/graphite cell cycled between 2.6-4.2 V at three different charging protocols: 1.5 C-rate fast-partial charging (to 82.5% SOC), 0.5 C-rate slow standard charging without or with a constant-voltage step (to 93% or 100% SOC). Quantitative discharge-curve and postmortem analyses are used to evaluate ageing. The results show that ageing rate increases in the order: fast-partial charging < standard charging < standard charging with constant-voltage period, indicating that higher SOC-range near full capacity is more detrimental to battery life than fast-charging. The capacity fade is totally dominated by cyclable-lithium loss. The ∼8% NMC-LMO active material loss has negligible impact on the cell capacity fade due to the electrodes excess material in the fresh cell and its moderate loss rate with ageing compared to the cyclable-lithium. Similar ageing modes in terms of capacity fade and impedance rise are found irrespective of the charging protocol.
机译：在电动汽车快速充电站，通常建议避免充电超过〜80％的充电状态（SOC），因为从顶到满容量会不成比例地增加充电时间。与慢速充电到家庭或住宅充电的典型满容量相比，有必要研究其长期影响。在这里，我们介绍了在三种不同的充电协议下，在2.6-4.2 V之间循环的商用18650 NMC-LMO /石墨电池的长期老化效应：1.5 C速率快速部分充电（至82.5％SOC），0.5 C速率缓慢标准充电，不带或带有恒定电压阶跃（至93％或100％SOC）。定量放电曲线和事后分析用于评估老化。结果表明，老化率按以下顺序增加：快速部分充电<标准充电<恒定电压时段的标准充电，这表明接近全容量的较高SOC范围比快速充电更不利于电池寿命。容量衰减完全受可循环锂损耗的支配。约8％的NMC-LMO活性材料损耗对电池容量衰减的影响微不足道，这是由于新鲜电池中的电极过量材料及其与可循环锂相比老化时损耗率适中。不论充电方案如何，在容量衰减和阻抗上升方面都可以找到相似的老化模式。

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