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Negative electrode active substance material

一种负极活性物质、杂质的技术，应用在活性物质电极、负电极、电池电极等方向，能够解决负极活性物质材料困难等问题

Inactive Publication Date: 2015-07-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, there are doubts about whether the method disclosed in Patent Document 1 can sufficiently improve the charge-discharge cycle characteristics of lithium-ion secondary batteries.
In the final analysis, it is considered to be extremely difficult to actually manufacture the negative electrode active material material proposed in Patent Document 1

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0118] The powdery negative electrode active material, negative electrode, and coin cell of Invention Example 1 to Invention Example 13 and Comparative Example 1 were produced by the following method. Subsequently, changes in the crystal structure caused by charge and discharge of the negative electrode active material material were confirmed. Furthermore, the discharge capacity (discharge capacity per unit volume) and cycle characteristics of the battery were investigated.

[0119] [Example 1 of the present invention]

[0120] [Manufacture of negative electrode active material]

[0121] The chemical composition of the powdery negative electrode active material was Cu-15.5 atomic % Sn, that is, the chemical composition of the negative electrode active material contained 15.5 atomic % of Sn and the balance was Cu and impurities. Specifically, a mixture of 22.34 g of copper and 7.66 g of tin was high frequency melted to produce a melt. The melt was cast to produce an ingot ha...

Embodiment 2

[0235] In the same manner as in Example 1, negative electrode active material materials, negative electrodes, and button batteries of Examples 14 to 53 of the present invention were produced. Further, negative electrode active material materials, negative electrodes, and button batteries of Comparative Examples 2 to 4 were produced. Subsequently, the crystal structures of the examples of the present invention and the comparative examples were specified, and the discharge capacities (mhA / cm 3 ). The results are shown in Table 5.

[0236] [table 5]

[0237] table 5

[0238]

[0239] First time: Use the value of the 1st - 4th internal cycle where the capacity starts to stabilize

[0240] About each invention example and a comparative example, it demonstrates referring Table 5.

[0241] [For Example 14 of the present invention]

[0242] A mixture of Cu and Sn was prepared. In the same manner as in Examples 2 to 13 of the present invention, the prepared mixture was high-f...

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Abstract

Provided is a negative electrode active material that can improve the capacity per volume and charge-discharge cycle characteristics of a nonaqueous electrolyte secondary battery represented by a lithium ion secondary battery. The negative electrode active material according to the present embodiment contains an alloy phase. The alloy phase undergoes thermoelastic diffusionless transformation when releasing or occluding metal ions. The negative electrode active material of the present embodiment is used in a nonaqueous electrolyte secondary battery. Thermoelastic diffusionless transformation refers to so-called thermoelastic martensitic transformation.

Description

technical field [0001] The present invention relates to electrode active material materials, and more specifically, to negative electrode active material materials. Background technique [0002] In recent years, the popularity of small electronic devices such as home video cameras, notebook computers, and smartphones has advanced, and increasing the capacity and life of batteries has become a technical issue. [0003] In order to further popularize hybrid electric vehicles, plug-in hybrid electric vehicles, and electric vehicles, the miniaturization of batteries has also become a technical issue. [0004] Currently, graphite-based negative electrode active material materials are used in lithium ion batteries. However, the graphite-based negative electrode active material has the above-mentioned technical problems. [0005] Here, alloy-based negative-electrode active material materials with higher capacity than graphite-based negative-electrode active material materials are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C22C9/02
CPCC22C19/03H01M2220/30H01M2220/20H01M2004/027C22C9/04C22C30/02C22C9/02H01M4/38C22C30/06C22C19/007C22C30/04Y02E60/10H01M4/387H01M4/134H01M10/0525
Inventor 山本祐義祢宜教之永田辰夫森口晃治米村光治掛下知行寺井智之福田隆
Owner NIPPON STEEL CORP
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