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12Â¥2016-12-27 13:51:47
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godsdream09

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13Â¥2016-12-27 18:42:06
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song995777

½ð³æ (ÕýʽдÊÖ)

To be No.1

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ÒýÓûØÌû:
2Â¥: Originally posted by ywuweizi at 2016-12-26 16:46:56
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14Â¥2016-12-29 16:34:01
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xmq135828

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

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ywuweizi: ½ð±Ò+5, ºÜÓÐÒâÒå 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.
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15Â¥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.
16Â¥2017-01-11 15:18:39
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ywuweizi

°æÖ÷ (ÖøÃûдÊÖ)

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.
17Â¥2017-01-11 15:19:00
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linger9285

ľ³æ (СÓÐÃûÆø)

¡ï
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ÒýÓûØÌû:
16Â¥: 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 ...

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18Â¥2017-02-24 13:43:24
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ywuweizi

°æÖ÷ (ÖøÃûдÊÖ)

ÎÄÏ×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
19Â¥2017-02-24 14:41:02
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ÒýÓûØÌû:
19Â¥: Originally posted by ywuweizi at 2017-02-24 14:41:02
ÎÄÏ×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

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20Â¥2017-02-28 16:02:15
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