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Negative electrode active material for non-aqueous electrolyte secondary batteries, negative electrode for non-aqueous electrolyte secondary batteries, non-aqueous electrolyte secondary battery, and method for producing negative electrode active material for non-aqueous electrolyte secondary batteries

A negative electrode active material and non-aqueous electrolyte technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of electrolyte consumption and easy degradation of cycle characteristics

Active Publication Date: 2018-08-31
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, on the newly formed surface, the electrolyte solution undergoes a decomposition reaction, and a decomposition product of the electrolyte solution, that is, a film, is formed on the newly formed surface, thereby consuming the electrolyte solution.
Therefore, the cycle characteristics become easy to degrade

Method used

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  • Negative electrode active material for non-aqueous electrolyte secondary batteries, negative electrode for non-aqueous electrolyte secondary batteries, non-aqueous electrolyte secondary battery, and method for producing negative electrode active material for non-aqueous electrolyte secondary batteries
  • Negative electrode active material for non-aqueous electrolyte secondary batteries, negative electrode for non-aqueous electrolyte secondary batteries, non-aqueous electrolyte secondary battery, and method for producing negative electrode active material for non-aqueous electrolyte secondary batteries
  • Negative electrode active material for non-aqueous electrolyte secondary batteries, negative electrode for non-aqueous electrolyte secondary batteries, non-aqueous electrolyte secondary battery, and method for producing negative electrode active material for non-aqueous electrolyte secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0197] According to the following sequence, make as image 3 A laminated film type secondary battery 30 is shown.

[0198] Make the positive electrode first. The positive active material is 95 parts by mass of lithium-cobalt composite oxide, namely LiCoO 2 , 2.5 parts by mass of the positive electrode conductive aid, and 2.5 parts by mass of the positive electrode binder (polyvinylidene fluoride, PVDF) are mixed to make the positive electrode mixture. Next, the positive electrode mixture is dispersed in an organic solvent (N-methyl-2-pyrrolidone, NMP) to form a pasty slurry. Next, the slurry was coated on both sides of the positive electrode current collector with a coating device having a die, and dried with a hot air drying device. At this time, the thickness of the positive electrode current collector was 15 μm. Finally, compression molding is performed by rolling.

[0199] Next, create a negative electrode. In order to make the negative electrode active material, the...

Embodiment 1-2～1-5

[0208] (Examples 1-2 to 1-5, Comparative Example 1-1, Comparative Example 1-2)

[0209]A secondary battery was produced in the same manner as in Example 1-1 except for adjusting the amount of oxygen in the bulk of the silicon compound particles. At this time, the amount of oxygen is adjusted by changing the ratio and temperature of the vaporized starting materials. In Examples 1-1 to 1-5, Comparative Example 1-1, and Comparative Example 1-2, SiO x The x values ​​of the silicon compounds represented are shown in Table 1.

[0210] After checking the initial charge and discharge characteristics (initial efficiency (%)) and cycle characteristics (maintenance rate (%)) of the secondary batteries of Examples 1-1 to 1-5, Comparative Example 1-1, and Comparative Example 1-2, The results shown in Table 1 were obtained.

[0211] The cycle characteristics were checked as follows. First, in order to stabilize the battery, charge and discharge were performed twice in an environment of ...

Embodiment 2-1～ Embodiment 2-4、 comparative example 2-1～ comparative example 2-3

[0224] Basically carry out the manufacture of secondary battery in the same manner as in Example 1-3, but in the silicon compound represented by SiOx, by changing the positional relationship between the vaporization starting material and the precipitation plate, the carbon dioxide in the negative electrode active material powder is The mass fraction of silicon particles, the presence or absence of composite secondary particles, and the presence or absence of silicon compound particles in composite secondary particles were changed as shown in Table 2. After examining the initial charge-discharge characteristics and cycle characteristics of the secondary batteries of Example 2-1 to Example 2-4 and Comparative Example 2-1 to Comparative Example 2-3, the results shown in Table 2 were obtained.

[0225] [Table 2]

[0226] SiOx(x=0.9); d50=5.4μm; XRD half value width 2θ=1.85; Si(111) crystallite: 4.72nm; Ib / Ia=1.95;

[0227] I 1330 / I 1580 = 1.2; carbon content: 5% by mass; carbo...

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Abstract

The present invention provides a negative electrode active material for non-aqueous electrolyte secondary batteries which includes negative electrode active material particles, and which is characterized in that: the negative electrode active material particles include silicon compound particles which include a silicon compound (SiOx:0.5<=x<=1.6) and have a carbon coating formed on at least some of the surfaces; and the negative electrode active material includes not more than 2 mass% of silicon dioxide particles, and includes silicon dioxide-carbon composite secondary particles which includea plurality of the silicon dioxide particles and carbon. Accordingly, provided is a negative electrode active material for non-aqueous electrolyte secondary batteries which is capable of increasing battery capacity, and improving cycle characteristics and initial battery efficiency.

Description

technical field [0001] The present invention relates to a negative electrode active material for a nonaqueous electrolyte secondary battery, a negative electrode for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery, and a method for manufacturing the negative electrode active material for a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, small electronic devices such as mobile terminals have been widely used, and further miniaturization, weight reduction, and longevity are urgently required. In response to such market demands, the development of a secondary battery that is particularly small and lightweight and capable of obtaining high energy density has been advanced. The application of this secondary battery is not limited to small electronic devices, and application to large electronic devices represented by automobiles and power storage systems represented by houses is also being studied. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01B33/113H01M4/13H01M4/133H01M4/36
CPCC01B33/113H01M4/134H01M10/0525H01M4/133H01M4/366H01M4/386H01M4/485Y02E60/10C01B32/05H01M4/587H01M4/625H01M4/483H01M10/052
Inventor 松野拓史广瀬贵一高桥广太古屋昌浩
Owner SHIN ETSU CHEM CO LTD
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