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Water system high-voltage mixed ion secondary battery based on zinc-lithium ferric manganese phosphate

A mixed ion and secondary battery technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of fast decay of capacitance, low capacitance of negative electrode materials, and easy to be affected by oxygen and water, etc., to achieve excellent The effects of rate performance, high capacity, and rechargeable capacity

Inactive Publication Date: 2016-08-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacitance of the negative electrode material is low, and it is easily affected by oxygen and water, and the capacitance decays too quickly during the charge-discharge cycle.

Method used

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  • Water system high-voltage mixed ion secondary battery based on zinc-lithium ferric manganese phosphate
  • Water system high-voltage mixed ion secondary battery based on zinc-lithium ferric manganese phosphate
  • Water system high-voltage mixed ion secondary battery based on zinc-lithium ferric manganese phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] With 21mol / L LiTFSI and 0.5mol / L ZnSO 4The aqueous solution of the electrolyte is used as the electrolyte, and the pH value of the electrolyte is controlled at 7 by adding an appropriate amount of lithium hydroxide (LiOH). The potential window of the electrolyte is as follows figure 1 shown.

[0025] Commercially available lithium manganese iron phosphate (LiFe 0.2 mn 0.8 PO 4 ) as the cathode active material, LiFe 0.2 mn 0.8 PO 4 SEM pictures and XRD spectra such as figure 2 with image 3 shown. LiFe 0.2 mn 0.8 PO 4 , the conductive agent acetylene black and the binder polytetrafluoroethylene are mixed in a mass ratio of 7:2:1, coated on the surface of the current collector graphite film, cut into a certain size, and dried in a vacuum to obtain LiFe 0.2 mn 0.8 PO 4 electrode sheet.

[0026] LiFe 0.2 mn 0.8 PO 4 The electrode sheet is the positive electrode, the zinc sheet with a thickness of 0.15mm is the negative electrode, LiTFSI and ZnSO 4 The mi...

Embodiment 2

[0028] Commercially available lithium manganese iron phosphate (LiFe 0.3 mn 0.7 PO 4 ) is the positive electrode active material. LiFe 0.3 mn 0.7 PO 4 , the conductive agent acetylene black and the binder polytetrafluoroethylene are mixed in a mass ratio of 7:2:1, coated on the surface of the current collector graphite film, cut into a certain size, and dried in a vacuum to obtain LiFe 0.3 mn 0.7 PO 4 electrode sheet.

[0029] LiFe 0.3 mn 0.7 PO 4 The electrode sheet is the positive electrode, the zinc sheet with a thickness of 0.15 mm is the negative electrode, and the mixed aqueous solution prepared in Example 1 is the electrolyte solution to assemble the battery. After testing, the charge-discharge curve of the prepared high-voltage mixed-ion secondary battery under 15mA / g constant current is as follows: Figure 5 shown.

Embodiment 3

[0031] After mixing zinc powder, porous carbon material activated carbon, conductive agent acetylene black, binder polytetrafluoroethylene and corrosion inhibitor indium oxide in a mass ratio of 50:20:20:9:1, press it on the current collector stainless steel mesh , cut to a certain size, and dried in a vacuum to obtain a zinc electrode.

[0032] The zinc electrode is used as the negative electrode, and the quality of the zinc powder is LiFe 0.3 mn 0.7 PO 4 Ten times of quality, with the LiFe that embodiment 2 makes 0.3 mn 0.7 PO 4 The electrode sheet is the positive electrode, and the mixed aqueous solution prepared in Example 1 is the electrolyte solution to assemble the battery. After testing, the charge-discharge curve of the prepared high-voltage mixed-ion secondary battery under 15mA / g constant current is as follows: Image 6 shown.

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Abstract

The invention relates to a water system high-voltage mixed ion secondary battery. A positive pole material of the battery is a high-voltage battery positive pole material, namely zinc-lithium ferric manganese phosphate (LiFe1-xMnxPO4), the element zinc serves as the majority of a negative pole material, and electrolyte is a liquid-state or gel-state material which is formed by lithium bis(trifluoromethane sulfonimide) (LiTFSI) and soluble zinc salt as solute and water as solvent and has ionic conductivity. The battery is based on the energy storage mechanisms of a dissolution-out / deposition reaction of zinc ions (Zn2+) on a negative pole and a reversible embedding / ejection reaction of the zinc ions (Zn2+) on a positive pole, meanwhile, through the water-in-salt electrolyte formed by high-concentration LiTFSI, the electrochemical water decomposition process is inhibited, a potential window of the water system electrolyte is remarkably broadened, the zinc-lithium mixed ion secondary battery has the advantages of being high in capacity, long in cycling life, safe, environmentally friendly, low in cost and the like, and the battery can be applied to the fields such as consumer electronic equipment, electromobiles and large-scale energy storage.

Description

technical field [0001] The invention belongs to the field of secondary batteries, in particular to an aqueous high-voltage mixed-ion secondary battery based on zinc-lithium iron manganese phosphate. Background technique [0002] With the advent of the information age, the role of energy storage devices in today's society is becoming more and more obvious. Existing electrochemical chemical energy storage batteries mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, flow batteries and lithium-ion batteries. However, so far no energy storage system can fully meet the requirements of large-scale energy storage. Lead-acid and nickel-cadmium batteries are highly toxic, which is not conducive to environmental protection. Ni-MH and flow batteries are expensive and their market competitiveness is weak. Lithium-ion batteries have occupied 3 / 4 of the consumer market of secondary batteries in the past two decades, especially in portable devic...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/62H01M10/0525H01M10/0563
CPCH01M4/136H01M4/621H01M10/0525H01M10/0563Y02E60/10
Inventor 崔光磊赵井文董杉木马君王晓刚
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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