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Lithium Occlusion/Release Material, Electrode, Lithium Ion Secondary Battery, And Method For Manufacturing Lithium Occlusion/Release Material

A technology for releasing materials and manufacturing methods, which is applied in secondary batteries, nanotechnology for materials and surface science, battery electrodes, etc. problem, to achieve the effect of excellent charge/discharge characteristics

Inactive Publication Date: 2018-05-08
JNC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the case of using Si alone as the negative electrode material, the Si phase is micronized due to the repetition of expansion when it is alloyed with lithium during charging and shrinkage when it is dealloyed with lithium during discharge, which may cause in-use There are problems such as the Si phase falling off from the electrode substrate or the electrical conductivity between the Si phases cannot be obtained, so there is a problem that the life of the power storage device is extremely short
[0009] Furthermore, Si has poorer conductivity than carbon-based materials and metal-based materials, and the efficient movement of electrons accompanying charge and discharge is restricted. Therefore, it is used as a negative electrode material in combination with a material that compensates for conductivity, such as carbon-based materials. However, even in this case In particular, there are problems in the initial charge and discharge, and high-efficiency charge and discharge characteristics.

Method used

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  • Lithium Occlusion/Release Material, Electrode, Lithium Ion Secondary Battery, And Method For Manufacturing Lithium Occlusion/Release Material
  • Lithium Occlusion/Release Material, Electrode, Lithium Ion Secondary Battery, And Method For Manufacturing Lithium Occlusion/Release Material
  • Lithium Occlusion/Release Material, Electrode, Lithium Ion Secondary Battery, And Method For Manufacturing Lithium Occlusion/Release Material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] With respect to 100 kg of new nickel as a nickel source as a raw material, 306.6 kg of silica as a silicon source and 184.0 kg of charcoal as a carbon source are used. figure 2The method described in the production flow chart shown produces a lithium occlusion-release material. The composition of the molten material was managed so that the atomic ratio of Fe to Ni in the lithium storage-release material (Fe / Ni ratio) was 0.063 or less. In other examples and comparative examples, the management of the Fe / Ni ratio of the lithium occlusion-release material was also made the same. Cooling of the molten mass was performed by cooling from the molten state to 50° C. over 3 hours. The average cooling rate in this case was 0.1°C / sec. Thus, a lithium storage-release material having an atomic ratio of silicon to nickel (Si / Ni ratio) of 3.0 was obtained in a yield of 99%.

[0126] (Measurement example 1) X-ray photoelectron spectrum

[0127] The lithium occlusion-release mater...

Embodiment 2

[0150] With respect to 100 kg of new nickel as a nickel source as a raw material, 255.5 kg of silica as a silicon source and 153.2 kg of charcoal as a carbon source are used. figure 2 The method described in the production flow chart shown produces a lithium occlusion-release material. Cooling of the molten mass was performed by cooling from the molten state to 50° C. over 3 hours. The average cooling rate in this case was 0.1°C / sec. Thus, a lithium storage-release material having an atomic ratio of silicon to nickel (Si / Ni ratio) of 2.5 was obtained in a yield of 99%.

Embodiment 3

[0152] Using 408.9 kg of silica as a silicon source and 245.3 kg of charcoal as a carbon source with respect to 100 kg of new nickel as a nickel source as a raw material, use figure 2 The method described in the production flow chart shown produces a lithium occlusion-release material. Cooling of the molten mass was performed by cooling from the molten state to 50° C. over 3 hours. The average cooling rate in this case was 0.1°C / sec. Thus, a lithium storage-release material having an atomic ratio of silicon to nickel (Si / Ni ratio) of 4.0 was obtained in a yield of 99%. The size of the Si phase measured in the same manner as in Measurement Example 3 was 84 nm.

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Abstract

Disclosed is a lithium occlusion / release material which can be applied as an electrode material of a lithium ion secondary battery which stably has excellent charge and discharge characteristics without requiring high-speed cooling in the manufacturing process. The lithium occlusion / release material is characterize din that the material contains Si and Ni, and has a Si phase and a NiSi2 phase. According to a peak of Si in the X-ray diffraction spectrum of the lithium occlusion-release material according to Scherrer's equation, and the average diameter of the calculated crystals is 100 nm or less.

Description

technical field [0001] The invention relates to a lithium storage and release material, an electrode, a lithium ion secondary battery and a manufacturing method of the lithium storage and release material. Background technique [0002] In recent years, with the rapid development of electronic equipment, communication equipment, etc., and the development of miniaturization technology, various portable equipments are spreading. Furthermore, as a power source for these portable devices, there is a strong demand for the development of secondary batteries with high capacity and excellent life characteristics from the viewpoint of economy, size reduction and weight reduction of the devices. [0003] As such a small, lightweight, and high-capacity secondary battery, rocking-chair lithium-ion batteries are being developed, put into practical use, and widely used. The rocking-chair lithium-ion batteries release lithium ions from between layers A lithium intercalation compound is use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525B82Y30/00C22C1/02C22C19/03
CPCH01M4/386H01M10/0525C22C1/023C22C19/03B82Y30/00Y02E60/10
Inventor 儿岛健志河村荣木崎哲朗高野义人
Owner JNC CORP
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