Nickel-hydrogen power battery

A power battery and nickel-metal hydride technology, which is applied in the field of high-power battery preparation, can solve the problems of high output power, high temperature resistance, low temperature resistance of the battery, which have not been reported, the battery high-power discharge performance is reduced, and can not work, etc. The effect of small expansion, avoiding internal short circuit and excellent performance

Inactive Publication Date: 2005-11-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods generally require the use of complex battery electrode fabrication techniques, such as surface treatment, high temperature heating, etc., and there are no reports on the high output power, high temperature resistance, and low temperature resistance of the battery.
When the Ni-MH battery is working at high temperature or low temperature, the negative electrode is easy to precipitate hydrogen, resulting in a significant decline in the high-power discharge performance of the battery, or even failure to work.

Method used

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Embodiment 1

[0025] Positive electrode active material spherical Ni(OH) 2 Preparation of composites with additives. The present invention adopts chemical precipitation crystal growth method to prepare spherical Ni(OH) 2 , and join as Y 2 o 3 , CeO 2 , CoO, ZnO, TiO 2 , Yb 2 o 3 and other additives to make positive composite active materials. Spherical Ni(OH) 2 Low-density Ni(OH) with irregular shape 2 Compared with, it has relatively high density and good filling fluidity. Therefore, using spherical Ni(OH) 2 As an active material, it can increase the filling capacity per unit volume of the electrode, thus increasing the electrode capacity accordingly.

[0026]add Y 2 o 3 , CoO and Yb 2 o 3 (mass ratio 1:1:1) spherical Ni(OH) 2 , the mass ratio of its additive addition is 4%.

[0027] In the preparation process, nickel sulfate, sodium hydroxide, ammonia water and metered additives are generally used as raw materials; NiSO 4 The relative density of the solution is controlle...

Embodiment 2

[0029] AB 3 Preparation of novel hydrogen storage alloys. AB 3 type alloy structure containing AB 5 and AB 2 units such as AB 5 +2AB 2 = 3AB 3 . LaCaMgNi 6 mn 2 Al 1 For example, its X-ray diffraction analysis with silicon powder such as figure 2 as shown, figure 2 for AB 3 X-ray diffraction analysis of new hydrogen storage alloy and silicon powder. due to AB 3 The c-axis of the alloy lattice is longer, and it can contain Mm, Ca, Mg, Ti on the A side, so the theoretical hydrogen storage capacity can reach 500mAh / g, and the actual measurement can generally reach 360-420mAh / g, and the price is relatively It is inexpensive and has a good cycle life. In the alloy preparation process, the volatile metals Ca and Mg are first melted with Al to obtain a master alloy, and then other components are added in a vacuum induction furnace (1200°C) for induction melting, and the alloy is melted in a water-cooled copper crucible. cast into alloy ingots. Under the protection ...

Embodiment 3

[0032] MmCaMgNi 6 co 1 mn 1 Al 1 alloy electrodes. See embodiment 2 for specific operation steps. add C 60 , BN and Y 2 o 3 (mass ratio 1:1:1) of MmCaMgNi 6 co 1 mn 1 Al 1 In the alloy electrode, the mass ratio of the additive is 4%. The prepared electrode has excellent charge and discharge performance, see image 3 , image 3 C added for 4% 60 , BN and Y 2 o 3 MmCaMgNi 6 co 1 mn 1 Al 1 Electrode charge-discharge curve.

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Abstract

The battery consists of anode, diaphragm, electrolyte and cathode. The active material of the anode is composed of spherical Ni(OH)2 grains and oxide additive of transition metal. The active material of the cathode is composed of the additive C60, BN or transition metal oxide and AB3 type hydrogen stored alloy. In formula AB3, A includes at least two elements among mixed rare earths Mm, Ca, Mg, Ti, and B includes at least three elements among Ni, Co, Mn, Cu and Al. spherical Ni (OH) 2 anode material with small expansion, high temperature resistant and high utilization ratio is prepared by using the crystal growth method of chemical deposition. The hydrogen stored alloy with high capacity, large hydrogen diffusion coefficient as well as antioxidant and anticorrosion, low self-discharge and long service life. The battery is suitable for large scale of production.

Description

technical field [0001] The invention relates to the preparation of a high-power battery, which is a nickel-metal hydride power battery. Background technique [0002] The research and development of new high-energy batteries has been recognized as the driving force for the rapid development of high-tech industries such as information technology, new energy, new materials, and environmental protection in the 21st century. It has become a priority technology and has formed a huge military-civilian dual-use market. . In the field of new high-energy batteries, high-power, high-temperature-resistant, and low-temperature-resistant Ni-MH power batteries have become a new bright spot. This is because Ni-MH power batteries can better meet high-power starting and wide operating temperature ranges in terms of comprehensive performance. Wait for the request. [0003] At present, the development of high-power nickel-metal hydride power batteries is a research hotspot at home and abroad....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/24H01M4/28H01M4/30
CPCY02E60/124Y02E60/10
Inventor 陈军李锁龙陶占良
Owner NANKAI UNIV
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