Electrochemical surface passivation of LiCoO(2) particles at ultrahigh voltage and its applications in lithium-based batteries.
Electrochemical surface passivation of LiCoO(2) particles at ultrahigh voltage and its applications in lithium-based batteries.
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DOI：
10.1038/s41467-018-07296-6
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发表时间：
2018-11-21
影响因子：
16.6
通讯作者：
Lu Y
中科院分区：
文献类型：
--
作者：
Qian J;Liu L;Yang J;Li S;Wang X;Zhuang HL;Lu Y
锂钴氧化物作为便携式设备中流行的阴极，在商业锂离子电池中仅提供其理论容量的一半。当增加截止电压以释放更多容量时，电解质中钴的溶解和锂钴氧化物颗粒的结构紊乱是严重的，导致容量快速衰减和有限的循环寿命。在这里，我们展示了一类三元锂，铝，氟改性的锂钴氧化物，其具有稳定的导电层，使用简单且可扩展的水热辅助混合表面处理。这种表面处理阻碍了液体电解质和锂钴氧化物颗粒之间的直接接触，这减少了活性钴的损失。它还形成由锂-铝-钴-氧化物-氟固溶体组成的薄掺杂层，当在>4.55 V的电压下操作时，该掺杂层抑制锂钴氧化物的相变。LiCoO 2是广泛用于锂离子电池的阴极材料，但是当电压增加以释放更多容量时，其遭受钴的溶解和结构紊乱。在这里，作者展示了三元Li，Al和F改性的LiCoO 2和电池单元，其在4.55 V以上具有稳定的循环行为。
Lithium cobalt oxide, as a popular cathode in portable devices, delivers only half of its theoretical capacity in commercial lithium-ion batteries. When increasing the cut-off voltage to release more capacity, solubilization of cobalt in the electrolyte and structural disorders of lithium cobalt oxide particles are severe, leading to rapid capacity fading and limited cycle life. Here, we show a class of ternary lithium, aluminum, fluorine-modified lithium cobalt oxide with a stable and conductive layer using a facile and scalable hydrothermal-assisted, hybrid surface treatment. Such surface treatment hinders direct contact between liquid electrolytes and lithium cobalt oxide particles, which reduces the loss of active cobalt. It also forms a thin doping layer that consists of a lithium-aluminum-cobalt-oxide-fluorine solid solution, which suppresses the phase transition of lithium cobalt oxide when operated at voltages >4.55 V. LiCoO2 is a cathode material widely used in lithium-ion batteries but suffers from solubilization of cobalt and structural disorder when the voltage is increased to release more capacity. Here the authors show a ternary Li, Al and F-modified LiCoO2 and battery cells with stable cycling behavior over 4.55 V.
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