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Modified electrochemical hydrogen storage alloy having increased capacity, rate capability and catalytic activity

A hydrogen storage alloy and electrochemical technology, applied in the field of modified VTiZrNiCrMn alloy, can solve the problems of reducing the amount of surface area formation, the alloy has no catalytic surface, and the surface area of ​​the electrode is low.

Inactive Publication Date: 2001-09-19
OVONIC BATTERY CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the hydrogen-bonding strength may increase in dependence on temperature, thereby reducing the effective voltage and effective capacity during low-temperature discharge
(2) It is believed that the combination of Mn and Fe may result in a lower electrode surface area, the metallurgical rationale being that the amount of surface area formed during activation is reduced due to the increased ductility of the alloy
[0038] Finally, state-of-the-art alloys with high electrochemical storage capacity do not have very high catalytic surface
Some prior art alloys have a catalytic surface, but it is limited

Method used

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  • Modified electrochemical hydrogen storage alloy having increased capacity, rate capability and catalytic activity
  • Modified electrochemical hydrogen storage alloy having increased capacity, rate capability and catalytic activity
  • Modified electrochemical hydrogen storage alloy having increased capacity, rate capability and catalytic activity

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Comparison scheme
Effect test

Embodiment 1

[0064] Sn, Co, Al and Fe are considered as basic AB 2alloy additions. The 16 different chemical formulas were designed based on the orthogonal arrays used in the Tagage method in order to minimize the total number of alloys required to complete the design matrix. Each element has 4 different levels namely Sn(0.4,0.6,0.8,1.0), Co(0,0.5,1.0,1.5), Al(0,0.4,0.8,1.2), Fe(0,0.4,0.8 ,1.2), as shown in Table 1 (all values ​​are expressed in atomic percent). Alloy-01 is the basic formula (for comparison), which only contains Sn from one of the original materials at a content of 0.4% (zirconium tin alloy is used to replace zirconium), thereby reducing the cost of raw materials.

[0065] Alloy

#

Element concentration (atomic%)

capacity

(mAh / g)

sn

co

Al

Fe

V

Ti

Zr

Ni

Cr

mn

01

0.4

0.0

0.0

0.0

5.0

9.0

26.6

38.0

5.0

16.0

390

02

0.4...

Embodiment

[0073] The two electrodes using Alloy-01 and Alloy-12 are both made into equiprismatic batteries for electric vehicle applications (90Ah is determined according to the design). The test results of these batteries are summarized in Figure 3a , 3b and 3c. The two cells reached their design capacities and powers after heat treatment at 60°C for 5 days and different minimum cycles required for electricity generation. Batteries using Alloy-12 show little advantage in both capacity and power. But the most important finding was that the minimum number of cycles required to achieve maximum power was dramatically reduced from 39 (alloy-01) to 9 (alloy-12), a considerable drop in both capital equipment and electrical costs.

[0074] Electrogenesis was further studied. To make full use of the advantages of Alloy-12. Utilization of Alloy-12 enables the overall generation process to be reduced to 12 hours instead of the typical 37 hours required for electrogenesis of Alloy-01. The fi...

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Abstract

A modified Ti-V-Zr-Ni-Mn-Cr electrochemical hydrogen storage alloy which has at least one of the following characteristics: 1) an increased charge / discharge rate capability over that the base Ti-V-Zr-Ni-Mn-Cr electrochemical hydrogen storage alloy; 2) a formation cycling requirement which is reduced to one tenth that of the base Ti-V-Zr-Ni-Mn-Cr electrochemical hydrogen storage alloy; or 3) an oxide surface layer having a higher electrochemical hydrogen storage catalytic activity than the base Ti-V-Zr-Ni-Mn-Cr electrochemical hydrogen storage alloy.

Description

field of invention [0001] This invention relates to electrochemical hydrogen storage alloys, and more specifically to modified VTiZrNiCrMn alloys. More precisely, the present invention encompasses a modified VTiZrNiCrMn alloy having at least one of the following properties, 1) an increased charge / discharge rate capability compared to the charge / discharge rate performance of the base VTiZrNiCrMn electrochemical hydrogen storage alloy Rate performance, 2) a generation cycle requirement that reduces the number of generation cycles to 1 / 10 of that of the basic VTiZrNiCrMn electrochemical hydrogen storage alloy, 3) one layer has a higher than basic Ti-V-Zr-Ni-Mn The electrochemical hydrogen storage catalytic activity of the -Cr electrochemical hydrogen storage alloy is higher than the oxide surface layer. Background of the invention [0002] In rechargeable alkaline batteries, weight and portability are important criteria. Having a long operating life and not requiring regular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/02B22F5/00C01B3/00C22C14/00C22C16/00C22C19/00C22C27/02C22C27/06H01M4/38
CPCC22C16/00Y02E60/124C22C27/06Y10S420/90Y02E60/327Y02E60/12H01M4/383C22C27/025C01B3/0031C22C14/00Y02E60/10Y02E60/32Y10T428/12104
Inventor M·A·菲岑科K·杨S·R·奥弗辛斯基B·雷希曼J·科克W·梅斯
Owner OVONIC BATTERY CO INC