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Asymmetric electrochemical supercapacitor and method of manufacture thereof

A super capacitor, asymmetric technology, applied in the direction of electrolytic capacitors, capacitors, hybrid capacitor electrodes, etc., can solve problems such as high cost, achieve high discharge rate, high cycle life, and good working temperature.

Inactive Publication Date: 2011-03-23
美国纳米股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material still remains relatively costly, especially compared to other supercapacitor materials that offer comparable performance such as activated carbon

Method used

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  • Asymmetric electrochemical supercapacitor and method of manufacture thereof
  • Asymmetric electrochemical supercapacitor and method of manufacture thereof
  • Asymmetric electrochemical supercapacitor and method of manufacture thereof

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Embodiment

[0064] Layered double hydroxide (LDH) active materials were synthesized by co-precipitation at constant pH (8–10) and simultaneous addition / mixing of metal nitrate and alkaline solutions (NaOH+Na 2 CO 3 ) and prepared. The resulting product was then aged and crystallized overnight (75°C) in the synthesis solution, then isolated by centrifugation / sedimentation and washed Na-free + . The material was dried and ground with a mortar and pestle. A series of layered double hydroxide composites were prepared, see Table 1.

[0065] Table 1

[0066]

[0067] [Co 0.36 Ni 0.24 Al 0.4 (OH) 2 ](CO 3 ) 0.2 The samples were made into electrodes by mixing with 20% by weight of multi-walled carbon nanotubes (MWNT) and 3% by weight of PTFE (Dupont type 6C). The material is mixed with a mortar and pestle and rolled into sheets. Electrodes of 12 mm diameter were punched from this sheet and pressed onto nickel mesh current collectors. The double hydroxides thus prepared were subjec...

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Abstract

The disclosure relates to asymmetric supercapacitors containing: a positive electrode comprising a current collector and a first active material selected from a layered double hydroxide of formula [M2+1-xMx3+(OH)2]An-x / n.mH2O where M2+ is at least one divalent metal, M3+ is at least one trivalent metal and A is an anion of charge n-, where x is greater than zero and less than 1, n is 1, 2, 3 or 4 and m is 0 to 10; LiCoO2; LiCoxNiyO2 where x and y are greater than zero and less than 1; LiCoxNiyMn(1-x-y)O2 where x and y are greater than zero and less than 1; CoSx where x is from 1 to 1.5; MoS; Zn; activated carbon and graphite; a negative electrode containing a material selected from a carbonaceous active material, MoO3 and Li1xMoO6-x / 2; an aqueous electrolyte solution or a non-aqueous ionic conducting electrolyte solution containing a salt and a salt and a non-aqueous solution; and a separator plate. Alternatively, the electrolyte can be a solid electrolyte.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation of, and claims priority to, U.S. Patent Application No. 11 / 711,376, filed February 27, 2007, which was a U.S. Patent Application filed June 9, 2000 A continuation of, and claiming priority from, Ser. No. 09 / 590,496, which claims priority to U.S. Provisional Application No. 60 / 138,857, filed June 11, 1999, the contents of which are hereby incorporated by reference The entire text is incorporated herein. [0003] Statement of Government Interests [0004] This invention was made with Government support under Contract NAS 3-99054 awarded by NASA. The government has certain rights in this invention. technical field [0005] The present invention relates to electrochemical capacitors. In particular, the present invention relates to asymmetric electrochemical capacitors and methods of improving their energy and power densities. Background technique [0006] Electrochemical capacitors (...

Claims

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Application Information

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IPC IPC(8): H01G9/058H01G9/155H01G11/30
CPCY02E60/13
Inventor 史蒂芬・M・利普卡约翰・R・米勒肖东三代金祥
Owner 美国纳米股份有限公司
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