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Anode of nickel-metal hydride battery and preparation method of anode

A nickel-metal hydride battery and positive electrode technology, applied in battery electrodes, alkaline battery electrodes, circuits, etc., can solve the problems of low utilization rate of active materials and large internal resistance, and achieve improved performance and high current discharge capacity. The effect of expansion and improvement of utilization rate

Inactive Publication Date: 2012-09-19
SHANGHAI YAOYU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used binders are CMC and PTFE, because CMC is a hydrophilic binder, and PTFE is a hydrophobic binder. The combination of the two can overcome their respective shortcomings and achieve complementary advantages, but there is still activity. The disadvantages of low material utilization rate and large internal resistance

Method used

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  • Anode of nickel-metal hydride battery and preparation method of anode
  • Anode of nickel-metal hydride battery and preparation method of anode
  • Anode of nickel-metal hydride battery and preparation method of anode

Examples

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Embodiment 1

[0032] The positive electrode of the nickel-metal hydride battery of this embodiment includes a current collector and a positive electrode material filled and coated on the current collector. The positive electrode material includes a binder with a mass percentage content of 2% and 90% Mg-doped β-Ni. (OH) 2 and 8% nickel powder. The specific preparation method is as follows:

[0033] 1) Preparation of Mg-doped β-Ni(OH) by homogeneous complexation co-precipitation method 2 : Sodium hydroxide is added in the mixed solution of magnesium sulfate and nickel sulfate, react to generate crystallization; Wash after solid-liquid separation, dry, obtain the β-Ni(OH) doped with Mg 2 ; The mol ratio of the nickel salt, magnesium sulfate and sodium hydroxide added is 2:0.1:2;

[0034] 2), the Mg-doped β-Ni(OH) prepared in step 1) 2 After mixing evenly with 90% by mass percentage and 8% by mass of nickel powder, add 2% by mass of binder (HPMC and PTFE with a mass ratio of 1:1) and stir e...

Embodiment 2

[0037] The positive electrode of the nickel-metal hydride battery of this embodiment includes a current collector and a positive electrode material filled and coated on the current collector. (OH) 2 and 15% nickel powder. The specific preparation method is as follows:

[0038] 1) Preparation of Mg-doped β-Ni(OH) by homogeneous complexation co-precipitation method 2 : Sodium hydroxide is added in the mixed solution of magnesium sulfate and nickel nitrate, reacted to generate crystallization; Wash after solid-liquid separation, dry, obtain the β-Ni(OH) doped with Mg 2 ; The mol ratio of the nickel nitrate, magnesium sulfate and sodium hydroxide added is 2:0.3:3;

[0039] 2), the Mg-doped β-Ni(OH) prepared in step 1) 2 After mixing 80% by mass with 15% by mass of nickel powder, add 5% by mass of binder (HPMC and PTFE with a mass ratio of 1:1.5) and stir evenly to form a slurry, scrape coating into the collector;

[0040] 3) After drying at 110°C, press molding.

Embodiment 3

[0042]The positive electrode of the nickel-metal hydride battery of this embodiment includes a current collector and a positive electrode material filled and coated on the current collector. The positive electrode material includes a binder with a mass percent content of 3%, and 85% Mg-doped β-Ni. (OH) 2 and 12% nickel powder. The specific preparation method is as follows:

[0043] 1) Preparation of Mg-doped β-Ni(OH) by homogeneous complexation co-precipitation method 2 : Sodium hydroxide is added in the mixed solution of magnesium sulfate and nickel sulfate, react to generate crystallization; Wash after solid-liquid separation, dry, obtain the β-Ni(OH) doped with Mg 2 ; The mol ratio of the nickel sulfate, magnesium sulfate and sodium hydroxide that adds is 2:0.2:2.5;

[0044] 2), the Mg-doped β-Ni(OH) prepared in step 1) 2 After mixing evenly with 85% by mass percent and 12% by mass of nickel powder, add 3% by mass of binder (HPMC and PTFE with a mass ratio of 1:1.2) and...

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Abstract

The invention discloses an anode of a nickel-metal hydride battery and a preparation method of the anode. The anode comprises a current collector and an anode material filled and coated on the current collector, wherein the anode material comprises 2-5wt% of bonding agent, 80-90wt% of Mg-doped beta-Ni(OH)2 and 8-15wt% of nickel powder. Compared with the prior art, the invention has the advantages that the doping of Mg is favorable for increasing the utilization rate of nickel electroactive materials, increasing the discharge potential of a nickel electrode, prolonging the service life of the nickel electrode and improving the usability and the large-current discharge capacity of the nickel electrode in a wide temperature range; and furthermore, HPMC (Hydroxy Propyl Methyl Cellulose) and PTFE (Polytetrafluoroethylene) are adopted as the bonding agent to form a layer of dense three-dimensional mesh structure on the surface of the anode, so that the expansion of a polar plate in a charge / discharge is inhibited, in addition, the falling of active materials can be reduced, and the cyclic life of the nickel electrode is better prolonged.

Description

technical field [0001] The invention relates to a nickel-hydrogen battery, in particular to a positive electrode of the nickel-hydrogen battery and a preparation method thereof. Background technique [0002] Ni(OH) 2 As a positive electrode active material, it is widely used in Ni / Cd, Ni / Zn, Ni / Fe, Ni / MH and other alkaline batteries. It exists in two crystal structures, α-Ni(OH) 2 and β-Ni(OH) 2 . At present, β-Ni(OH) is mainly used in the battery industry 2 As a cathode material, but pure β-Ni(OH) 2 There are some deficiencies in the electrochemical performance. For example, it is a P-type semiconductor material. There is a large difference between the conductivity and the solid-phase proton diffusion rate during charging and discharging, and the oxidation potential and oxygen evolution potential are relatively close. Overcharging is easy to generate γ-NiOOH with a small density and cause electrode expansion. damage, etc., so use pure Ni(OH) 2 It is difficult for th...

Claims

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Application Information

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IPC IPC(8): H01M4/32H01M4/62H01M4/26
CPCY02E60/124Y02E60/10
Inventor 不公告发明人
Owner SHANGHAI YAOYU INDAL
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