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Negative electrode active material, mixed negative electrode active material material and preparation method of negative electrode active material

A negative electrode active material and carbon material technology, which is applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of electrolyte consumption and easy degradation of battery cycle characteristics, and achieve high-capacity cycle characteristics and good cycle characteristics.

Active Publication Date: 2022-06-07
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, since the decomposition reaction of the electrolyte solution occurs on the newly formed surface, and a film of decomposition products of the electrolyte solution is formed on the newly formed surface, the electrolyte solution is consumed.
Therefore, the cycle characteristics of the battery tend to decrease

Method used

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  • Negative electrode active material, mixed negative electrode active material material and preparation method of negative electrode active material
  • Negative electrode active material, mixed negative electrode active material material and preparation method of negative electrode active material
  • Negative electrode active material, mixed negative electrode active material material and preparation method of negative electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0125] Make the following steps figure 2 A laminated film type lithium ion secondary battery 20 is shown.

[0126] The positive electrode was initially made. Mixed positive electrode active material, namely LiNi as lithium nickel cobalt composite oxide 0.7 Co 0.25 Al 0.05 O (lithium nickel cobalt aluminum composite oxide: NCA) 95 mass %, positive electrode conductive aid 2.5 mass %, positive electrode binder (polyvinylidene fluoride: PVDF) 2.5 weight %, and the positive electrode mixture was prepared. Next, the positive electrode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone: NMP) to prepare a paste-like slurry. Next, the slurry was applied to both surfaces of the positive electrode current collector by using a coating device having a die, and was dried by a hot-air drying device. At this time, a positive electrode current collector with a thickness of 15 μm was used. Finally, compression molding is performed using a roll press.

[0127] Subsequen...

Embodiment 1-2

[0144] The second step was carried out in the same manner as in Example 1-1, except that the temperature of the precipitation chamber was set to 750° C., the degree of vacuum was set to 0.3 Pa, and the film-forming rate of the silicon compound film on the adsorption plate was set to 15 g per hour. The battery was manufactured, and the cycle retention rate was calculated. As described above, in Example 1-2, by changing the temperature of the precipitation chamber, the degree of vacuum, and the film formation rate, the crystallinity of the silicon compound particles was changed, so that the 29 The shape of the Si-MAS-NMR spectrum changes.

[0145] Here, the silicon compound particles prepared in Example 1-2 were 29 The Si-MAS-NMR spectrum is shown in Figure 4 . of the silicon compound particles in Examples 1-2 29 In the Si-MAS-NMR spectrum, the following peaks appeared, respectively: -70 ppm peak derived from Si region with long period regularity; -80 ppm peak derived from ...

Embodiment 2-1～2-2 and comparative example 2-1、2-2

[0164] Production of a secondary battery was carried out in the same manner as in Example 1-1, except that the amount of oxygen in the silicon compound bulk was adjusted. At this time, the amount of oxygen is adjusted by changing the ratio of metal silicon to silicon dioxide in the raw material of the silicon compound and the heating temperature. Table 2 shows the SiO in Examples 2-1, 2-2 and Comparative Examples 2-1, 2-2 x The x-value of the silicon compound represented.

[0165] [Table 2]

[0166] SiOx D 50 =8μm, graphite (natural graphite:artificial graphite=5:5) D 50 =20μm

[0167] SiOx ratio 10% by mass, carbon material average thickness 50nm

[0168] Half-value width 2.257°, ​​crystallite 3.77nm

[0169]

[0170] As shown in Table 2, in SiO x In the represented silicon compound, when the value of x is outside the range of 0.5≤x≤1.6, the battery characteristics deteriorate. For example, as shown in Comparative Example 2-1, when oxygen was insufficient (x=0.3), ...

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Abstract

The present invention is a kind of negative pole active material, and it contains negative pole active material particle, is characterized in that, described negative pole active material particle contains silicon compound particle, and this silicon compound particle comprises silicon compound (SiO x : 0.5≤x≤1.6), in the passage of the silicon compound particles 29 In the spectrum obtained by Si-MAS-NMR, the silicon compound particles have three or more peaks in the range of chemical shift values ​​from -40ppm to -120ppm, and have no peaks in the range of chemical shift values ​​of -65±3ppm. peak. Accordingly, there is provided a negative electrode active material capable of improving cycle characteristics when used as a negative electrode active material of a secondary battery.

Description

technical field [0001] The invention relates to a negative electrode active material, a mixed negative electrode active material material and a preparation method of the negative electrode active material. Background technique [0002] In recent years, small electronic devices represented by mobile terminals and the like have been widely spread, and further reduction in size, weight, and lifespan is strongly demanded. In response to such market demands, development of a secondary battery that is particularly small and lightweight and that can obtain a high energy density has been advanced. The application of the secondary battery is not limited to small electronic devices, and applications to large electronic devices such as automobiles and power storage systems such as houses are also being studied. [0003] Among them, lithium-ion secondary batteries are expected to be easily reduced in size and capacity, and can obtain higher energy density than lead batteries and nickel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/36
CPCH01M10/0525H01M4/386H01M4/625H01M2004/021H01M4/483H01M4/364Y02E60/10H01M4/366C01B33/113C01P2002/86C01P2006/12H01M4/133H01M4/134H01M4/583H01M2004/027
Inventor 广濑贵一高桥广太松野拓史酒井玲子大泽祐介
Owner SHIN ETSU CHEM CO LTD
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