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Negative electrode active material for non-aqueous electrolyte secondary cell, negative electrode for non-aqueous electrolyte secondary cell, non-aqueous electrolyte secondary cell, and method for manufacturing negative electrode active material particles

一种负极活性物质、非水电解质的技术，应用在非水电解质蓄电池、活性物质电极、二次电池等方向，能够解决耗费电解液、循环特性降低等问题，达到抑制分解、抑制导电性下降、提高容量维持率的效果

Active Publication Date: 2018-01-26
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 the decomposition product of the electrolyte solution, that is, a film, is formed on the newly formed surface, thereby consuming the electrolyte solution.
Therefore, cycle characteristics tend to degrade

Method used

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  • Negative electrode active material for non-aqueous electrolyte secondary cell, negative electrode for non-aqueous electrolyte secondary cell, non-aqueous electrolyte secondary cell, and method for manufacturing negative electrode active material particles
  • Negative electrode active material for non-aqueous electrolyte secondary cell, negative electrode for non-aqueous electrolyte secondary cell, non-aqueous electrolyte secondary cell, and method for manufacturing negative electrode active material particles
  • Negative electrode active material for non-aqueous electrolyte secondary cell, negative electrode for non-aqueous electrolyte secondary cell, non-aqueous electrolyte secondary cell, and method for manufacturing negative electrode active material particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0195] According to the following sequence, make as image 3 A laminated film type secondary battery 30 is shown.

[0196] Make the positive electrode first. The positive electrode active material is a mixed lithium-cobalt composite oxide, namely LiCoO 2 95 parts by mass, 2.5 parts by mass of positive electrode conductive aid, and 2.5 parts by mass of positive electrode binder (polyvinylidene fluoride, PVDF) to prepare a 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.

[0197] Next, make the negative electrode. In order to make the negative electrode, the raw material (als...

Embodiment 1-2～1-5

[0204] (Examples 1-2 to 1-5, Comparative Example 1-1, Comparative Example 1-2)

[0205] 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. At this time, the amount of oxygen is adjusted by changing the ratio and temperature of the vaporized starting material. Table 1 shows x values ​​of silicon compounds represented by SiOx in Examples 1-1 to 1-5, Comparative Example 1-1, and Comparative Example 1-2.

[0206] After checking the cycle characteristics (maintenance rate %) and the initial charge and discharge characteristics (initial efficiency %) 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. the results shown.

[0207]The cycle characteristics were checked as follows. First, in order to stabilize the battery, charge and discharge were performed twice in an environment of 25°C, a...

Embodiment 2-1～ Embodiment 2-6、 comparative example 2-1

[0218] A secondary battery was manufactured basically in the same manner as in Examples 1-3, but in the silicon compound represented by SiOx, the conditions of lithium doping treatment (in-bulk modification), that is, the treatment conditions of lithium doping, were changed to Change the type of lithium compound included. After examining the cycle characteristics and initial charge and discharge characteristics of the secondary batteries of Examples 2-1 to 2-6 and Comparative Example 2-1, the results shown in Table 2 were obtained.

[0219] [Table 2]

[0220] SiOx (x=0.9); D 50 =5.2μm; XRD half value width 2θ=1.85°; Si(111) crystallite 4.62nm; I1330 / I1580=1.2;

[0221] Carbon content: 5% by mass; carbon layer thickness: 100nm; carbon layer coverage: 80%;

[0222] Phosphorus content: 2000 mass ppm; boron content: 0 mass ppm; sodium content: 20 mass ppm; potassium content: 30 mass ppm; magnesium content: 25 mass ppm; calcium content: 30 mass ppm; aluminum content: 250 mass pp...

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Abstract

The present invention provides a negative electrode active material for a non-aqueous electrolyte secondary cell having negative electrode active material particles, the negative electrode active material particles having a silicon compound (SiOx; where 0.5 <= x <= 1.6) containing a Li compound, wherein the negative electrode active material for a non-aqueous electrolyte secondary cell is characterized in that: the silicon compound has a carbon coating formed at least partially thereon; the negative electrode active material particles include a coating comprising a compound having a boron-fluorine bond and / or a compound having a phosphorus-fluorine bond on at least a part of the surface of the silicon compound, the carbon coating, or both; and the negative electrode active material particles contain elemental boron or elemental phosphorus in a range of 10 mass ppm to 10,000 mass ppm in relation to the total amount of the negative electrode active material particles. A negative electrode active material for a non-aqueous electrolyte secondary cell with which it is possible to increase cell capacity and improve cycle characteristics and initial cell efficiency is thereby provided.

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 a negative electrode 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 that can achieve 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. [0003] Among ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/131H01M4/36H01M4/58
CPCH01M4/0459H01M4/1391H01M4/625H01M10/052H01M2220/30H01M4/583H01M4/366H01M4/483H01M2004/027Y02E60/10C01B32/05C01B33/113H01M4/485H01M4/587H01M4/62H01M10/0525H01M4/5825H01M2004/021
Inventor 松野拓史加茂博道广瀬贵一吉川博树
Owner SHIN ETSU CHEM CO LTD
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