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小木虫论坛-学术科研互动平台 » 化学化工区 » 电化学 » 化学电源 » 高镍三元正极材料在高压电解液的衰减原因是什么？
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songfoo

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ywuweizi: 金币+1 2017-01-11 15:11:04
高镍的氧化性较高，材料与电解液形成的固液界面发生反应。
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11楼2016-12-27 13:50:57
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ppxoxo

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这个主题很好，坐听高手回答

发自小木虫Android客户端
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12楼2016-12-27 13:51:47
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godsdream09

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氧和镍的能级重叠，与电解液反应失去氧形成岩盐相NiO，导致性能衰减。

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心若在，梦若在。
13楼2016-12-27 18:42:06
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song995777

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To be No.1
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引用回帖:
2楼: Originally posted by ywuweizi at 2016-12-26 16:46:56
明显地发现，在4.5V以上，三元材料的过渡金属原子急剧溶解在电解液中，然后通过隔膜迁移到负极石墨，导致电池的阻抗增大，引起循环性能恶化。

怎么发现的？
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时不我待，天道酬勤！
14楼2016-12-29 16:34:01
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xmq135828

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ywuweizi: 金币+5, 很有意义 2017-01-01 10:29:47
Highly reactive Ni4+ will be predominant at the end of charge leading to undesired side reactions with the electrolyte solution. This will eventually lead to a consumption of active material, gas evolution and capacity fading. Furthermore, the high temperature stability of the material will decrease with higher nickel contents leading to serious safety concerns
Just like in pure LNO high nickel contents in NCM will lead to a Li/Ni cation mixing. This will lead to a spinel formation on the surface and eventually to the formation of the inactive Fm(-)3m phase and capacity fade.
Starting with NCM811 a prolonged cycling will lead to cracks in the secondary particles along the grain boundaries. This leads to a continuous increase in surface area and hence more active sites for parasitic reactions.
我只是文献的搬运工
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15楼2017-01-01 09:43:28
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ywuweizi

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It is well known that Li[NixCoyMnz]O2, especially with x > 0.6,readily reacts with air, resulting in the formation of Li2CO3 and LiOH on the cathode surface [18,19]. The formed LiOH reacts with LiPF6
and generates acidic HF in the electrolyte. In addition, Li2CO3 gives rise to severe swelling upon storage at high temperatures, especially in the charged state [20]. Table 2 exhibits the total residual
lithium amounts (LiOH and Li2CO3) on the cathode surfaces. The total residual lithium amount increased with increasing Ni content in Li[NixCoyMnz]O2 and increased drastically at Ni contents (x)
above 0.7.
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16楼2017-01-11 15:18:39
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ywuweizi

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Increasing Ni content appears to favor the spinel-like transformation of the primary particles, leading to the gradual deterioration of the discharge capacity. It is also noted that the particle size which almost proportionally decreased with the Ni content may have also contributed to the structural stability of the Li[Ni1/3Co1/3Mn1/3]O2 electrode.
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17楼2017-01-11 15:19:00
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linger9285

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引用回帖:
16楼: Originally posted by ywuweizi at 2017-01-11 15:18:39
It is well known that LiO2, especially with x > 0.6,readily reacts with air, resulting in the formation of Li2CO3 and LiOH on the cathode surface . The formed LiOH reacts with LiPF6
and generates ...

楼主，这是哪一篇文献？刚接触三元正极，求指教
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18楼2017-02-24 13:43:24
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ywuweizi

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文献Comparison of the structural and electrochemical properties of layered Li[NixCoyMnz]O2 (x ¼ 1/3, 0.5, 0.6, 0.7, 0.8 and 0.85) cathode material for lithium-ion batteries
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19楼2017-02-24 14:41:02
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日月即是明

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引用回帖:
19楼: Originally posted by ywuweizi at 2017-02-24 14:41:02
文献Comparison of the structural and electrochemical properties of layered LiO2 (x ¼ 1/3, 0.5, 0.6, 0.7, 0.8 and 0.85) cathode material for lithium-ion batteries

厉害
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20楼2017-02-28 16:02:15
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