Supercharge Your Innovation With Domain-Expert AI Agents!

Negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and method for producing negative electrode active material

A technology of negative electrode active material and silicon compound, which is applied in the direction of active material electrode, negative electrode, battery electrode, etc., can solve the problem of insufficient stability of aqueous negative electrode slurry, and achieve the effect of good initial charge and discharge characteristics.

Pending Publication Date: 2021-06-18
SHIN ETSU CHEM IND CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the aqueous negative electrode slurry is stored at a high temperature, gas generation, etc. are observed, and the stability of the aqueous negative electrode slurry is not sufficient.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and method for producing negative electrode active material
  • Negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and method for producing negative electrode active material
  • Negative electrode active material, mixed negative electrode active material, aqueous negative electrode slurry composition, and method for producing negative electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0196] Through the following steps, make Figure 4 A laminated film type lithium ion secondary battery 20 is shown.

[0197] First, make the positive electrode. Mixed positive electrode active material, 95% by mass of LiNi as lithium nickel cobalt composite oxide 0.7 co 0.25 Al 0.05 O, 2.5% by mass of the positive electrode conductive aid and 2.5% by mass of the positive electrode binder (polyvinylidene fluoride: PVDF) to make the positive electrode mixture. 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 using a coating device having a die, and dried using a hot-air drying device. At this time, a positive electrode current collector having a thickness of 15 μm was used. Finally, compression molding is performed using a roller press.

[0198] Subsequently, a negative electrode was fabricated. Fi...

Embodiment 1-2～ Embodiment 1-3

[0211] (Example 1-2 to Example 1-3, Comparative Examples 1-1, 1-2)

[0212] Production of a secondary battery was performed in the same manner as in Example 1-1 except for adjusting the amount of oxygen in the bulk silicon compound. At this time, the amount of oxygen is adjusted by changing the ratio of metal silicon to silicon dioxide in the silicon compound raw material or by changing the heating temperature. Table 1 shows SiO in Examples 1-1 to 1-3 and Comparative Examples 1-1 and 1-2 x The x-values ​​of the indicated silicon compounds.

[0213] In this case, the silicon-based active material particles of Examples 1-1 to 1-3 and Comparative Examples 1-1 and 1-2 had the following properties. The interior of the silicon compound particles in the negative electrode active material particles contains Li 2 SiO 3 and Li 2 Si 2 o 5 . In addition, the half width (2θ) of the diffraction peak derived from the Si(220) crystal plane obtained by X-ray diffraction of the silicon ...

Embodiment 2-1、 Embodiment 2-2

[0221] Except for changing the type of lithium silicate contained in the silicon compound particles to that shown in Table 2, secondary batteries were produced under the same conditions as in Example 1-2, and the cycle characteristics and initial efficiency were evaluated.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

A negative electrode active material for nonaqueous electrolyte secondary batteries, which contains a phosphoric acid salt and negative electrode active material particles that contain silicon compound particles containing a silicon compound (SiOx wherein 0.5 <= x <= 1.6), said silicon compound particles containing at least one of Li2SiO3 and Li2Si2O5, and which is configured such that: the negative electrode active material particles contain lithium element in the surfaces; and the ratio of the molar quantity mp of the phosphorus element contained in unit mass of the negative electrode active material particles to the molar quantity ml of the lithium element contained in unit mass of the negative electrode active material particles and present in the surfaces of the negative electrode active material particles satisfies the relational expression 0.02 <= mp / ml <= 3. Consequently, this negative electrode active material for nonaqueous electrolyte secondary batteries is able to stabilize an aqueous negative electrode slurry, and is capable of improving the initial charge and discharge characteristics if 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, a water-based negative electrode slurry composition 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 used, and further miniaturization, weight reduction, and long life are strongly demanded. In response to such market demands, the development of a particularly small and lightweight secondary battery capable of achieving high energy density has been advanced. The application of this secondary battery is not limited to small electronic devices, and its application to large electronic devices represented by automobiles and power storage systems represented by houses and the like is also being studied. [0003] Among them, lithium-ion secondary batteries are expected to be easy to miniaturize and inc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/139H01M4/1393H01M4/36H01M4/58H01M4/587
CPCH01M4/587H01M4/131H01M4/485H01M4/386Y02E60/10H01M4/366H01M4/364H01M4/483H01M4/5825H01M4/62H01M4/628H01M4/625H01M4/1391H01M10/052H01M2004/027H01M4/133H01M4/139H01M2004/021
Inventor 松野拓史粟野英和广濑贵一高桥广太大泽祐介
Owner SHIN ETSU CHEM IND CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com