Granular composite for manufacturing negative electrode of lithium-ion secondary cell
A composite material, secondary battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of increased power consumption of portable electronic devices, and achieve the effects of improving Coulombic efficiency, reducing resistance, and increasing energy density
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Embodiment 1
[0148] Si particles (D v90 Below 200nm, D of secondary particles n50 0.45 g of carbon nanotubes (CNT: produced by vapor phase growth method; fiber diameter ranges from 10 nm to 15 nm, and aspect ratio The range is more than 300 and less than 450, and the BET specific surface area is 260m 2 / g, the oxidation start temperature is 500℃, 0.8g / cm 3 0.18 g of compacted resistivity under pressure (0.019 Ω·cm), 0.18 g of carboxymethylcellulose (CMC, product number 1380, manufactured by Daicel Corporation, 1% by mass, viscosity of 25°C aqueous solution is 1380 mPa·s), 0.45 g of graphite particles (SCMG (registered trademark), manufactured by Showa Denko Co., Ltd.; the median of the number-based cumulative distribution of the aspect ratio is 1.56) 3.42 g and 30 ml of water were treated for 5 minutes to obtain Si particles, CNT, CMC, and SCMG The complex gel (1) formed (Table 1).
[0149] Next, the composite gel (1) was dried under vacuum at 80°C overnight. Afterwards, the dried pro...
Embodiment 2
[0168]Carboxymethylcellulose (CMC, product number 1380, manufactured by Daicel Corporation) was replaced with hydroxyethyl cellulose (HEC, product number SP850, manufactured by Daicel Corporation, 1% by mass, viscosity of 25° C. aqueous solution was 2600 mPa·s), In addition, utilize the method identical with embodiment 1 to obtain D v50 21 μm granular composite material B. The BET specific surface area of granular composite B based on nitrogen adsorption is 2.59m 2 / g, tap density is 0.61g / cm 3 (Table 1).
[0169] Except that the granular composite material A was replaced by the granular composite material B, a half-cell was produced by the same method as in Example 1, and aging and cycle tests were performed. The apparent density of the electrode is 1.64g / cm 3 . The results are shown in Table 2. SEM images of electrode cross-sections and Figure 1~3 The images shown are the same. Coulombic efficiency when aging treatment was performed was 87.9%. The IR drop is 0.01...
Embodiment 3
[0200] Replace Si particles with Sn particles (D v90 Below 200nm, D n50 D of 80nm, secondary particles n50 120nm, and there are more than 95% in 10-400nm in the number standard particle size distribution), except that, the same method as in Example 1 was used to obtain D v50 It is 21μm granular composite material I. The BET specific surface area based on nitrogen adsorption of granular composite I is 2.31m 2 / g, tap density is 0.58g / cm 3 (table 3).
[0201] Except that the granular composite material A was replaced by the granular composite material I, a half-cell was produced by the same method as in Example 1, and aging and cycle tests were performed. The apparent density of the electrode is 1.63g / cm 3 . The results are shown in Table 4. Coulombic efficiency when aging treatment was performed was 87.9%. The IR drop is 0.019V.
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