Negative-electrode active material, and method for production of negative-electrode active material

A technology of active materials and negative electrodes, applied in the field of preparation of negative electrode active materials, can solve the problems of low initial charge and discharge efficiency, improve charge and discharge efficiency and discharge capacity, and prevent irreversible reactions

Active Publication Date: 2014-02-26
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, even when negative electrode active materials as disclosed in JP6-325765A are used, the problem of low initial charge and discharge efficiency cannot be solved

Method used

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  • Negative-electrode active material, and method for production of negative-electrode active material
  • Negative-electrode active material, and method for production of negative-electrode active material
  • Negative-electrode active material, and method for production of negative-electrode active material

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preparation example Construction

[0056] The preparation method of the negative electrode active material of the present invention is not particularly limited. Examples of methods include physically mixing silicon oxide SiO x Chemically mix silicon oxide SiO with silicate compound (1) and heat treatment x Mixed with silicate compounds (1) and electrochemically mixed silicon oxide SiO x With silicate compound (1). It is preferable to use the preparation method of the negative electrode active material of the present embodiment described below.

[0057] [Preparation method of negative electrode active material] The preparation method of the negative electrode active material of the present embodiment includes mixing SiO y (0<y<2) represents the mixing step of silicon oxide and metal oxide and the heat treatment step of heat-treating the mixture obtained in the mixing step in a non-oxidizing atmosphere. The negative absolute value of the standard Gibbs energy of the oxidation reaction of the metal oxide at the heati...

Embodiment 3

[0107] (Example 3) A negative electrode active material was obtained in the same manner as in Example 2, except that the reaction temperature was changed to 700°C.

Embodiment 4

[0108] (Example 4) A negative electrode active material was obtained in the same manner as in Example 2, except that the reaction temperature was changed to 800°C. The form of the negative electrode active material was observed under a scanning transmission electron microscope (STEM). Figure 3 to Figure 5 A dark field STEM image (DF-STEM) is shown in. The gray area is SiO, the white area is Fe 2 SiO 4 . STEM observation and energy dispersive X-ray spectrometry (EXD) were performed on this negative electrode active material to observe the distribution of O, Si, and Fe. The results are shown in Figure 6A to 6D in. Figure 6A It is a DF-STEM image. Figure 6B The whitish area shows the distribution of O (oxygen), Figure 6C The whitish area shows the distribution of Si (silicon), Figure 6D The whitish area shows the distribution of Fe. The image in Fig. 6 indicates the presence of Fe compounds on the surface of the SiO phase. Figure 3 to Figure 6D The image in shows that in ...

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Abstract

A negative-electrode active material characterized by containing a silicon oxide represented by a general formula SiOx (0 aSibOc-m(OH)-n(H20), and a method for the production of a negative-electrode active material which includes a mixing step of mixing a silicon oxide that is represented by a general formula SiOy (0 < y < 2) and a metal oxide, and a heat treatment step of performing a heat treatment on the mixture that is obtained in the mixing step in a non-oxidizing atmosphere and in which the negative absolute value of the standard Gibbs energy of the oxidation reaction of the metal oxide at the heating temperature in the heat treatment step is smaller than the negative absolute value of the standard Gibbs energy of the oxidation reaction of Si at the heating temperature in the heat treatment step.

Description

Technical field [0001] The invention relates to a negative electrode active material and a method for preparing the negative electrode active material. Background technique [0002] With the recent rapid popularity of information and communication devices such as personal computers, video cameras, and portable phones, the development of batteries used as power sources for the devices is considered important. In the automotive industry, high-output and high-capacity batteries for electric vehicles or hybrid vehicles are under development. Among various types of batteries, lithium batteries have attracted attention due to their high energy density and high output. [0003] Lithium batteries generally include a positive electrode active material layer including a positive electrode active material, a negative electrode active material layer including a negative electrode active material, and an electrolyte layer interposed between the electrode active material layers, and optionally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/04H01M4/131H01M4/1391H01M4/36H01M4/136H01M4/1397
CPCH01M2004/027H01M4/5825H01M4/0471Y02E60/122H01M4/131H01M4/483H01M4/366H01M4/1397H01M4/364H01M4/136H01M4/1391Y02E60/10C01B33/20H01M4/36H01M4/362H01M4/48H01M4/02H01M4/38H01M4/381H01M4/386Y02P70/50
Inventor 山村英行
Owner TOYOTA JIDOSHA KK
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