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Double-cathode material and water-based secondary battery

A cathode material and cathode active material technology, which is applied in the field of dual cathode materials and aqueous secondary batteries, can solve problems such as small specific capacity, and achieve the effects of low cost, broad application prospects and high capacity.

Active Publication Date: 2016-05-25
中国人民解放军军事科学院防化研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy storage mechanism of manganese dioxide mainly relies on the reversible oxidation-reduction reaction between manganese (IV) and manganese (III) to store charges, and its theoretical specific capacity can reach 308mAh / g, but the manganese dioxide prepared by the prior art is actually The specific capacity is much smaller than the theoretical value

Method used

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  • Double-cathode material and water-based secondary battery
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  • Double-cathode material and water-based secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The molar ratio of Na:Mn is 0.55:1, sodium carbonate (0.055mol) and manganese carbonate (0.1mol) are used as raw materials, blended by ball milling, put into a ceramic boat, and placed in a muffle furnace at 5°C min -1 Heat up to 500°C for 2h, then 2°C·min -1 Raise the temperature to 800°C and sinter for 16 hours to obtain Na 0.44 MnO 2 . The above synthesized Na 0.44 MnO 2 As the active material of the electrode, it is mixed according to the ratio of active material: acetylene black: binder polytetrafluoroethylene at 85:10:5, rolled into a sheet, dried in an oven at 120°C for 12 hours, and cut into 1×1cm 2 , the active substance loading is about 5mg / cm 2 Left and right, the electrodes are made by pressing on the stainless steel mesh with a pressure of 10MPa on the hydraulic press. Na 0.44 MnO 2 The electrode is used as the positive electrode, the zinc sheet with a large excess of active material is used as the negative electrode, and the electrolyte is 0.5molL ...

Embodiment 2

[0033] Using commercial LiMn 2 o 4 As the active material of the electrode, it is mixed according to the ratio of active material: acetylene black: binder of 85:10:5, rolled into a sheet, dried in an oven at 120°C for 12 hours, and cut into 1×1cm 2 , the active substance loading is about 5mg / cm 2 Left and right, the electrodes are made by pressing on the stainless steel mesh with a pressure of 10MPa on the hydraulic press. LiMn 2 o 4 The electrode is used as the positive electrode, the zinc sheet is used as the negative electrode, and the electrolyte is 1molL -1 Li 2 SO4+0.5molL -1 ZnSO4+0.05molL -1 The MnSO4 mixed aqueous solution is assembled into a battery, which is denoted as the second battery Cell2. The second battery Cell2 is at 100mAg -1 (calculate the specific capacity and charge-discharge current density based on the mass of the positive active material) the charge-discharge curve under constant current is as follows image 3 shown. Calculated by the mass ...

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Abstract

The invention relates to a double-cathode material and a water-based secondary battery. An active material of the double-cathode material is simultaneously from a cathode and an electrolyte solution, wherein the cathode comprises a cathode active material; the cathode active material is a compound, into which bivalent zinc ions can be extracted and inserted; the electrolyte solution comprises an electrolyte and a solvent; the electrolyte comprises a soluble zinc salt and a soluble manganese salt; and the solvent is water. When the charging voltage of the double-cathode material is greater than 1.8V (vs.Zn / Zn<2+>), manganese ions are subjected to electrochemical oxidation-reduction process when zinc ions and the manganese ions in the electrolyte solution synergistically act; and high specific capacity and cycling stability of the cathode material are achieved, so that the capacity of the double-cathode material is greater than 200mAhg<-1>; the double-cathode material has the outstanding characteristics of being low in cost, long in lifetime, friendly to environment and the like, can be quickly charged and discharged, and is wide in application prospect as the cathode material for the water-based secondary battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a double positive electrode material and a water-based secondary battery. Background technique [0002] In today's society, the insufficient supply of fossil energy has become the bottleneck of global economic development. At the same time, the environmental pollution caused by the use of fossil energy is becoming more and more serious. Actively developing and utilizing renewable new energy and large-scale power storage technology and building a smart grid are the only ways to reduce human dependence on fossil energy and purify the environment. Battery-based chemical power storage technology is the premise and basis for realizing renewable energy power generation, and its demand is urgent. Existing chemical energy storage batteries mainly include lead-acid batteries, nickel-metal hydride batteries, flow batteries, and lithium-ion batteries with organic medi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/0568
CPCH01M4/505H01M4/525H01M10/0525H01M10/0568Y02E60/10
Inventor 文越华程杰申亚举徐良赵鹏程徐艳曹高萍杨裕生
Owner 中国人民解放军军事科学院防化研究院
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