Active substance, electrode, secondary battery, battery pack, and electric vehicle

A secondary battery and active material technology, applied in the direction of active material electrodes, secondary batteries, electric vehicles, etc., can solve the problem of reducing battery characteristics and achieve the effect of excellent battery characteristics

Active Publication Date: 2014-09-10
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a decomposition reaction of the electrolyte solution occurs on the newly formed surface, and the electrolyte solution is consumed to form a coating originating from the electrolyte solution on the newly formed surface, and therefore, battery characteristics are easily degraded

Method used

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  • Active substance, electrode, secondary battery, battery pack, and electric vehicle
  • Active substance, electrode, secondary battery, battery pack, and electric vehicle
  • Active substance, electrode, secondary battery, battery pack, and electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-8

[0261] Manufactured in the following process Figure 9 and Figure 10 The laminated film type lithium ion secondary battery shown in .

[0262] When manufacturing the positive electrode 53, first, 91 parts by mass of the positive electrode active material (LiCoO 2 ), 6 parts by mass of a positive electrode conductor (graphite) and 3 parts by mass of a positive electrode binder (polyvinylidene fluoride: PVDF) were mixed to obtain a positive electrode mixture. Subsequently, the cathode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone: NMP) to obtain paste cathode mixture slurry. Subsequently, both surfaces of the positive electrode current collector 53A (a strip-shaped aluminum foil having a thickness of 12 μm) were uniformly coated with the positive electrode mixture slurry using a coating device, and the coated positive electrode mixture slurry was dried to form a positive electrode active material layer 53B. Finally, the cathode active material layer 53...

Embodiment 2-1 to 2-11

[0279] Through a procedure similar to that of Example 1-1, secondary batteries were manufactured, but as shown in Table 2, the ratio D1 / D2 and the ratio D1 / D3 were changed, and various characteristics were examined. In these examples, the ratio D1 / D2 and the ratio D1 were adjusted by changing conditions such as the ratio between methane gas and acetylene gas, the heating temperature, and the type of auxiliary gas in the step of forming the covering portion by the thermal decomposition CVD method. / D3.

[0280] 【Table 2】

[0281]

[0282] In the case where specific ions are detected by the positive ion analysis of the covering part, when the ratio D1 / D2 is equal to or greater than 1.25, a high initial efficiency equal to or greater than 70% and a high capacity retention ratio equal to or greater than 80% are obtained, and The case where the ratio D1 / D2 is less than 1.25 is different. When the ratio D1 / D2 is equal to or greater than 50, the initial efficiency and the capaci...

Embodiment 3-1 to 3-9

[0284] Through a procedure similar to that of Example 1-1, secondary batteries were manufactured, but as shown in Table 3, the average thickness and average coverage of the covering portion were changed, and various characteristics were examined. In these examples, in the step of forming the covered part, the average thickness is adjusted by changing conditions such as deposition rate and deposition time, and the average coverage is adjusted by changing conditions such as input power and deposition time.

[0285] 【table 3】

[0286]

[0287] High initial efficiency and high capacity retention ratio are obtained independently of the average thickness of the covering. However, in the case where the average thickness is greater than 500 nm, since the formation amount of the covering portion is too large, the battery capacity decreases. Therefore, in the case where the average thickness is equal to or less than 500 nm, high initial efficiency and high capacity retention ratio a...

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Abstract

The present invention relates to an active substance, an electrode, a secondary battery, a battery pack, and an electric vehicle. The secondary battery comprises a positive electrode; a negative electrode comprising the active substance; and electrolyte, wherein the active substance comprises a central portion, and a covering portion which is located on the surface of the central portion, the central portion comprises silicon (Si) as a component, the covering portion comprises carbon (C) and hydrogen (H) as components, and kation analysis is carried out using a time of flight second ion mass spectroscopy method to detect one or more kinds of kation represented by CxHy (wherein x and y satisfy 2<=x<=6, and 3<=y<=9).

Description

[0001] Cross reference to related applications [0002] This application claims the benefit of a prior Japanese patent application JP2013-44020 filed on March 6, 2013, which is hereby incorporated by reference in its entirety. technical field [0003] This technology relates to active materials including silicon (Si) as a constituent element, to electrodes and secondary batteries using active materials, and to battery packs, electric vehicles, power storage systems, electric tools, and electronic equipment using secondary batteries . Background technique [0004] In recent years, various electronic devices, such as mobile phones and personal digital assistants (PDAs), have been widely used, and it is required to further reduce the size and weight of the electronic devices, and to achieve a long lifespan thereof. Accordingly, as a power supply source for electronic devices, a battery, particularly a small and lightweight secondary battery capable of providing high energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/02
CPCY02T10/7005Y02T10/7011Y02E60/122H01M4/131H01M4/366H01M4/485H01M4/625H01M10/052Y02E60/10Y02T10/70H01M4/38H01M4/386H01M4/60H01M10/0525H01M2220/20
Inventor 广濑贵一川濑贤一西寿朗小泉公
Owner MURATA MFG CO LTD
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