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Negative electrode active material for lithium-ion battery, negative electrode for lithium-ion battery and lithium-ion battery

A negative electrode active material, lithium-ion battery technology, applied in the direction of active material electrode, battery electrode, lithium battery, etc., can solve the problems of initial discharge capacity or initial coulombic efficiency decrease, Li path characteristics are not high enough, and it is difficult to reach Si equivalent, Achieve the effect of improving initial discharge capacity and initial coulombic efficiency

Active Publication Date: 2020-08-14
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the anode active material obtained by alloying Si, the Li storage capacity of the Si compound phase, that is, the Li path characteristic is not high enough.
Therefore, in the case of miniaturization, Li ions diffuse and move in the Si compound phase, making it difficult to reach the Si phase. As a result, there is a problem that the initial discharge capacity and the initial coulombic efficiency decrease.

Method used

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  • Negative electrode active material for lithium-ion battery, negative electrode for lithium-ion battery and lithium-ion battery
  • Negative electrode active material for lithium-ion battery, negative electrode for lithium-ion battery and lithium-ion battery
  • Negative electrode active material for lithium-ion battery, negative electrode for lithium-ion battery and lithium-ion battery

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Embodiment

[0054] Hereinafter, the present invention will be described more specifically by using examples. Here, unless otherwise specified, the unit % of the alloy composition is mass %.

[0055] 1. Manufacture of negative electrode active materials

[0056] Each raw material was weighed so as to have the alloy composition shown in Table 1 below. Molten alloys are prepared by heating and dissolving each weighed raw material using a high-frequency induction furnace. Each of the obtained molten alloys was quenched by using a single-roll quenching method to obtain quenched alloy ribbons. The roll peripheral speed was 42 m / s and the nozzle distance was 3 mm. Each of the obtained quenched alloy ribbons was mechanically pulverized using a mortar to produce a powdery negative electrode active material. In addition, miniaturization treatment is performed by using a planetary ball mill so that the target size of the Si phase can be obtained as needed.

[0057]

[0058] 2. Structural obs...

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Abstract

The present invention relates to a negative electrode active material for a lithium-ion battery, containing a Si phase, a Si-Zr compound phase, and a Sn-X compound phase in which X is at least one element selected from the group consisting of Cu, Ti, Co, Fe, Ni, and Zr, the Sn-X compound phase has a proportion of 0.1 mass % to 18 mass % to the whole, and the Si phase has a proportion of 10 mass %to 80 mass % to the whole. The invention also relates to a negative electrode for a lithium-ion battery and a lithium-ion battery.

Description

technical field [0001] The invention relates to negative electrode active materials for lithium ion batteries, negative electrodes for lithium ion batteries and lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantage of being able to be miniaturized with high capacity and high voltage, and are widely used as power sources for mobile phones, notebook computers, and the like. In recent years, lithium-ion batteries have also attracted attention as power sources for electric power applications in electric vehicles, hybrid vehicles, and the like, and research and development of lithium-ion batteries has been actively promoted. [0003] In a lithium ion battery, lithium ions (hereinafter also referred to as Li ions) move between positive and negative electrodes to initiate charge and discharge. During charge, Li ions are stored in the negative electrode active material on the negative electrode side, and during discharge, Li ions are released...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/386H01M4/62H01M4/628H01M4/134H01M10/0525Y02E60/10H01M4/387H01M4/364H01M4/621H01M4/661H01M10/052H01M2004/027
Inventor 木村优太宫本宽幸
Owner DAIDO STEEL CO LTD