Mixed electrolyte aqueous rechargeable nickel sodium/lithium battery and preparation method thereof

An electrolyte and lithium battery technology, applied in the field of electrochemistry, can solve the problem of high price of nickel-hydrogen batteries, and achieve the effects of being beneficial to mass production, reducing production costs and being easy to obtain.

Inactive Publication Date: 2018-05-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, elements A are generally transition metal elements or rare earth metal elements, such as: Zr, Ti, La, V, and cerium-rich mixed rare earth Mm, etc., due

Method used

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  • Mixed electrolyte aqueous rechargeable nickel sodium/lithium battery and preparation method thereof
  • Mixed electrolyte aqueous rechargeable nickel sodium/lithium battery and preparation method thereof
  • Mixed electrolyte aqueous rechargeable nickel sodium/lithium battery and preparation method thereof

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Example Embodiment

[0025] Such as Figure 1 to Figure 3 As shown, the present invention provides a method for preparing a mixed electrolyte water-based rechargeable nickel sodium / lithium battery. The water-based neutral system and the water-based alkaline system battery’s electrolyte are mixed, and Ni(OH) 2 As cathode material, NaTi 2 (PO 4 ) 3 Is a negative electrode material; the preparation method includes the following steps:

[0026] Step 1. Preparation of cathode material: mix 30ml 1.6mol / L NaOH with 30ml 0.8mol / L NiSO 4 ·6H 2 O is mixed uniformly and stirred for 1 hour, then transferred to a stainless steel reactor and kept at 150°C-200°C for 12-24 hours. The resulting solution is centrifuged and cleaned and then freeze-dried to obtain the cathode material Ni(OH) 2 .

[0027] Step 2. Preparation of negative electrode material: 3.4mL of tetrabutyl titanate (C 16 H 36 O 4 Ti) was added dropwise to containing 30-40mL ethylene glycol (C 2 H 6 O 2 ) And 10mL ammonia (NH 3 ·H 2 O(28wt.%)), after cont...

Example Embodiment

[0031] Example 1

[0032] Ni(OH) 2 -NaTi 2 (PO 4 ) 3 / C system

[0033] The positive electrode uses synthetic Ni(OH) 2 , The negative electrode adopts NaTi 2 (PO 4 ) 3 / C, according to the mass ratio of active material: acetylene black: binder = 8:1:1, mix it evenly, and coat it on the current collector (the positive electrode current collector is titanium mesh, the negative electrode current collector is stainless steel mesh), after drying , Were pressed into a positive electrode film and a negative electrode film. Using non-woven fabric as the diaphragm, NaOH and Na 2 SO 4 The mixed aqueous solution is used as an electrolyte to assemble a full battery. The results show that the charge and discharge voltage is stable at about 1.40V and 1.10V, at 0.5Ag -1 The charging capacity is 35mAh g at current density -1 ,,The discharge capacity is 24mAh g -1 . At 1Ag -1 Under the current density, the charging specific capacity is 25mAh g -1 ,The specific discharge capacity is 15mAh g -1 .

Example Embodiment

[0034] Example 2

[0035] Ni(OH) 2 -NaTi 2 (PO 4 ) 3 / C system

[0036] The cathode uses commercial spherical Ni(OH) 2 , The negative electrode adopts NaTi 2 (PO 4 ) 3 / C, according to the mass ratio of active material: acetylene black: binder = 8:1:1, mix it evenly, and coat it on the current collector (the positive electrode current collector is titanium mesh, the negative electrode current collector is stainless steel mesh), after drying , Were pressed into a positive electrode film and a negative electrode film. Using non-woven fabric as the diaphragm, NaOH and Na 2 SO 4 The mixed aqueous solution is used as an electrolyte to assemble a full battery. The results show that the charging and discharging voltage is stable at about 1.40V and 1.10V, at 1Ag -1 Under the current density, the charging specific capacity is 23mAh g -1 , The discharge specific capacity is 17mAh g -1 .

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Abstract

The invention discloses a mixed electrolyte aqueous rechargeable nickel sodium/lithium battery and a preparation method thereof. The preparation method comprises the following steps of 1, taking metaloxide or hydroxide as a positive electrode material; 2, taking positive ion de-intercalation material as a negative electrode material; 3, performing uniform mixing on the positive and negative electrode active materials, acetylene black and 1% of PTFE at the mass ratio of 8 to 1 to 1 and then uniformly coating a current collector to be used as a working electrode, taking a platinum sheet electrode of 10*10*0.1mm as a counter electrode, and taking a mercury/mercuric oxide electrode as a reference electrode, performing a charging-discharging test in a mixed water solution of alkali salt and neutral salt; and 4, performing positive and negative electrode material matching according to the actual capacity of the material, performing uniform mixing on the active material, a conductive agent and a binder, uniformly coating the current collector, and performing drying, and then pressing into a positive electrode membrane and a negative electrode membrane, and assembling into a total batteryto perform the charging-discharging test. The preparation method is simple, relatively low in cost and environment friendly.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a mixed electrolyte water system in which an alkaline mixed aqueous solution is used as an electrolyte, metal oxides or hydroxides are used as positive electrodes, and intercalation compounds of metal ions such as lithium ions and sodium ions are used as negative electrodes. Rechargeable battery and method of making same. Background technique [0002] As a kind of alkaline secondary battery, nickel-cadmium battery was earlier used in the battery types of mobile phones, ultra-tech and other equipment, because nickel-cadmium batteries have good high-current discharge characteristics, strong ability to withstand overcharge and discharge, and easy maintenance Etc. However, nickel-cadmium batteries have a memory effect, that is, before the battery is charged, the battery power is not completely exhausted, which will cause a decrease in battery capacity over time....

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/26H01M10/30
CPCH01M10/04H01M10/26H01M10/30Y02E60/10Y02P70/50
Inventor 米常焕唐晟阳张校刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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