Negative electrode active material for electrical equipment and electrical equipment using same

A technology for negative active materials and electrical equipment, applied in the direction of active material electrodes, negative electrodes, electrical components, etc., can solve the problems of reduced electrode cycle life, large expansion and contraction of negative electrodes, etc., achieve reduced expansion and contraction, and improve cycle durability and hardness and the effect of excellent electrical conductivity

Active Publication Date: 2019-10-01
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, lithium-ion secondary batteries in which a material alloyed with Li is used for the negative electrode have large expansion and contraction of the negative electrode during charge and discharge.
For example, graphite material expands about 1.2 times in terms of volume expansion when Li ions are occluded, while Si material transforms from an amorphous state to a crystalline state when Si and Li are alloyed. A large volume change (about 4 times) occurs, so there is a problem that the cycle life of the electrode is reduced
In addition, in the case of the Si negative electrode active material, the capacity and the cycle durability show a trade-off relationship, and there is a problem that it is difficult to improve the cycle durability while exhibiting a high capacity.

Method used

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  • Negative electrode active material for electrical equipment and electrical equipment using same
  • Negative electrode active material for electrical equipment and electrical equipment using same
  • Negative electrode active material for electrical equipment and electrical equipment using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0066] figure 1 It is a schematic cross-sectional view schematically showing the overall structure of a flat (laminated type) lithium ion secondary battery (hereinafter also simply referred to as "laminated battery"), which is a representative embodiment of the electric device of the present invention.

[0067] like figure 1 As shown, the laminated battery 10 of the present embodiment has a structure in which a substantially rectangular power generating element 21 that actually undergoes charge and discharge reactions is sealed inside a laminated sheet 29 serving as an outer package. Here, the power generating element 21 has a structure in which a positive electrode having a positive electrode active material layer 15 disposed on both surfaces of a positive electrode current collector 12, an electrolyte layer 17, and a negative electrode current collector 11 having a negative electrode active material layer 13 disposed on both surfaces thereof are configured. The negative e...

Embodiment 2～4

[0193] Si 60 sn 20 Ti 20 (comparative example 1)

[0194] Matrix / precipitated phase: Liquid / TiSi 2 、Si(diamond_A4)

[0195] (crystallization in liquid phase)

[0196] Nuclear growth model: Simplified (simplified)

[0197] Nucleation site: bulk (bulk) (also denoted as TiSi 2 , Si(dia))

[0198] Surface Energy: Use the value inferred from the Thermodynamics DB

[0199] Phase boundaries / mobility: using data from Kinetics DB

[0200] Volume of parent phase / precipitated phase: both 1E-4 (1×10 -4 )m 3 .

[0201] here, Figure 21 The temperature curve of is obtained as follows. Figure 19 It is a drawing showing the state of observation of the temperature of the quenched ribbon alloy obtained by the apparatus used for the liquid chill roll solidification method using an infrared temperature recorder. Specifically, the master alloys (master alloys of Examples 1 to 4) were sprayed on a Cu On the roll, the temperature of the thin strip-shaped alloy continuously formed hor...

Embodiment 1

[0292] [Manufacture of silicon-containing alloy]

[0293] Set alloy type to Si 65 sn 5 Ti 30 , made by liquid quenching and solidification method. The details will be described below. Specifically, Si alloys (65% by mass of Si, 5% by Sn of % by mass, Ti is 30% by mass) ingot alloy. The ingot alloy is pulverized so that it can be easily thrown into a quartz nozzle, and is coarsely pulverized to a diameter of about 2 mm.

[0294] Next, using the coarsely pulverized ingot alloy powder as a master alloy, a ribbon-shaped alloy = quenched ribbon alloy is produced as a silicon-containing alloy by a liquid quench solidification method. Specifically, using Nisshin Giken Co., Ltd. NEV-A05 type liquid quenching and solidification apparatus, Si was injected into a quartz nozzle installed in a chamber decompressed to gauge pressure -0.03 MPa after Ar replacement. 65 sn 5 Ti30 The master alloy is melted by high-frequency induction heating. Thereafter, it was sprayed onto a Cu roll ...

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Abstract

[Problem] The present invention provides a means capable of improving the cycle durability of electric devices such as lithium ion secondary batteries. [Solution] Use a negative electrode active material formed of a silicon-containing alloy having a ternary system represented by Si-Sn-M (M is one or more transition metal elements) for electrical equipment Alloy composition, and has the following structure: the microstructure has a first phase mainly composed of transition metal silicide (silicide), and a second phase mainly composed of amorphous or low-crystallinity Si that partially contains Sn , and further, a part is a plurality of independent first phases and a part is a eutectic structure formed by the first phase and the second phase.

Description

technical field [0001] The present invention relates to a negative electrode active material for electric equipment and an electric equipment using the same. The negative electrode active material for electrical equipment of the present invention and electrical equipment using the same can be used, for example, in the form of secondary batteries, capacitors, etc., as power sources for driving engines of vehicles such as electric vehicles, fuel cell vehicles, and hybrid electric vehicles. ,Auxiliary power. Background technique [0002] In recent years, there has been an urgent need to reduce the amount of carbon dioxide in order to cope with air pollution and global warming. In the automotive industry, the introduction of electric vehicles (EVs) and hybrid electric vehicles (HEVs) is expected to reduce carbon dioxide emissions, and the development of electrical equipment such as secondary batteries for driving engines, which is the key to their practical application, is in v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38C01B33/06
CPCC01B33/06H01M4/362B22F2009/048B22F2998/10H01M4/386C22C30/04C22F1/002Y02E60/10B22F1/07H01M2220/20B22F9/04H01M4/364H01M2004/027
Inventor 千叶启贵吉冈洋一芜木智裕渡边学荒井诚也
Owner NISSAN MOTOR CO LTD
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