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Anion/cation dual-ion rocking chair-type secondary battery and preparation method thereof

A secondary battery and dual-ion technology, applied in the field of electrochemical storage, to achieve high electrochemical specific capacity, increase the limit capacity, and improve the effect of specific capacity

Active Publication Date: 2018-10-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no battery in which the positive electrode can realize the reversible depletion of anions and cations at the same time.

Method used

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  • Anion/cation dual-ion rocking chair-type secondary battery and preparation method thereof
  • Anion/cation dual-ion rocking chair-type secondary battery and preparation method thereof
  • Anion/cation dual-ion rocking chair-type secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] (1) Cathode material: In terms of mass fraction, it includes 75% transition metal oxide Na 0.5 Ni 0.25 mn 0.75 o 2 , 20% acetylene black conductive agent, 5% polyvinylidene fluoride binder.

[0065] Negative electrode material: metal sodium sheet.

[0066] Battery separator: glass fiber membrane.

[0067] Electrolyte: 1mol L -1 NaClO 4 Propylene carbonate solution.

[0068] The positive electrode material, conductive agent and binder are mixed and coated on copper foil or aluminum foil as the positive electrode. The above electrodes were cut into discs with a diameter of 12 mm, and the glass fiber membrane was cut into discs with a diameter of 19 mm.

[0069] (2) Assemble the CR2032 button battery in an argon glove box, and the related accessories of the battery case (negative electrode case, shrapnel, gasket, positive electrode case) are all made of stainless steel. Assemble the above battery materials in the following order: negative electrode casing, shrapne...

Embodiment 2

[0075] Replace the transition metal oxide in step (1) with Na 0.67 co 0.33 mn 0.67 o 2 , the electrolyte volume in step (2) was replaced by 0.5mL, according to the method of steps (1)-(2) in Example 1, an anion-cation dual-ion rocking-chair secondary battery was produced.

Embodiment 3

[0077] Replace the transition metal oxide in step (1) with NaCoO 2 According to the method of steps (1)-(2) in Example 1, an anion-cation double-ion rocking-chair secondary battery was produced.

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Abstract

The invention relates to an anion / cation dual-ion rocking chair-type secondary battery including an cathode, an anode, a diaphragm and an electrolyte, wherein a cathode material includes a transitionmetal oxide with a general formula being AxMyOz, wherein A is Li, Na or K, M is one or more of Cr, Mn, Ni, Co, Fe and Cu, 0.1 < x < 2, 0.01 < y < 3, and 1 < z < 7. The invention also provides a preparation method for the anion / cation dual-ion rocking chair-type secondary battery, which includes the steps of: processing the cathode material, an anode material and the diaphragm into sheets; placingthe diaphragm between the cathode and the anode and adding the electrolyte. The anion / cation dual-ion rocking chair-type secondary battery can achieve reversible de-intercalation of the anion and cation in the oxide cathode material simultaneously, thereby largely increasing the capacity of the battery.

Description

technical field [0001] The invention relates to the field of electrochemical storage, in particular to an anion-cation double-ion rocking chair secondary battery and a preparation method thereof. Background technique [0002] Traditional "rocking chair" secondary batteries, such as lithium-ion batteries, sodium-ion batteries, and potassium-ion batteries, use alkali metal cations as charge carriers to reversibly deintercalate between positive and negative electrode materials to achieve charge and discharge. The theoretical capacity of this battery is determined by the number of alkali metal cations that are deintercalated, and this limit capacity value has always limited the development of the battery industry. Although it has been reported in the literature that carbon materials can achieve anion deintercalation, it has not been reported whether commercial transition metal oxide cathodes can achieve anion deintercalation. If the anion and cation can be deintercalated at the...

Claims

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Application Information

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IPC IPC(8): H01M10/054H01M4/505H01M4/525H01M10/058
CPCH01M4/505H01M4/525H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 郭少华周豪慎李琪乔羽
Owner NANJING UNIV
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