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Incombustible sodium secondary battery, electrolyte thereof and application of incombustible sodium secondary battery

A sodium secondary battery and electrolyte technology, which is applied in the field of electrochemical and chemical power supply products, can solve the problems of unused sodium ion batteries and achieve high safety effects

Inactive Publication Date: 2016-06-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Phosphate ester compounds have been studied as non-flammable solvents for lithium-ion batteries, but they have not been used in sodium-ion batteries so far.

Method used

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  • Incombustible sodium secondary battery, electrolyte thereof and application of incombustible sodium secondary battery
  • Incombustible sodium secondary battery, electrolyte thereof and application of incombustible sodium secondary battery
  • Incombustible sodium secondary battery, electrolyte thereof and application of incombustible sodium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a glove box filled with argon gas, a non-flammable electrolyte was prepared using a non-flammable phosphate ester, and the sodium salt used was NaPF 6 , NaPF in nonflammable electrolyte 6 The concentration is 0.8M; the film-forming agent used is FEC, and the addition amount in the non-flammable electrolyte is 10wt%; the non-flammable phosphate used is trimethyl phosphate (TMP) and triethyl phosphate (TEP). In addition, the composition of conventional carbonate electrolyte is 1MNaPF 6 EC / DEC (1:1), and add 5wt% FEC as a film-forming additive.

[0028] The prepared non-flammable phosphate electrolyte is ignited and tested, taking TMP electrolyte as an example, the results are as follows figure 1 shown, from figure 1 It can be seen that the carbonate electrolyte is extremely flammable, while the TMP electrolyte is completely non-flammable and has high safety.

[0029] In order to evaluate the charging and discharging performance of the sodium secondary battery, the ...

Embodiment 2

[0031] The negative electrode materials used are hard carbon, Sb / C antimony-based composite materials and NaTi 2 (PO 4 ) 3 , Sn / C tin-based composite material; the positive electrode material is NaFePO 4 , Na 3 V 2 (PO 4 ) 3 ,NaNi 0.35 mn 0.35 Fe 0.3 o 2 , the production method of the electrode pole piece is as follows:

[0032] Negative electrode sheet: mix hard carbon negative electrode or antimony-based negative electrode, 10wt% polyacrylic acid (PAA) aqueous solution, and acetylene black or SuperP at a mass ratio of 80:10:10, stir and mix thoroughly with a micro ball mill, and then pour it on the copper foil for coating. After vacuum drying, punch out the corresponding size (about 0.5cm 2 ) of the negative electrode film, compacted under 20Mpa, weighed and set aside.

[0033] Positive electrode sheet: the positive electrode material (NaFePO 4 、Na 3 V 2 (PO 4 )3 or NaNi 0.35 mn 0.35 Fe 0.3 o 2 ), the methylpyrrolidone (NMP) solution containing 4wt% polyv...

Embodiment 3

[0035] Assemble Sb / Na2016 button cells in a glove box filled with argon, using the TMP non-flammable electrolyte and TEP non-flammable electrolyte prepared in Example 1, using constant current charge and discharge mode, the working voltage range is 0.01 ~ 2V, The current density was 50 mA / g. see test results figure 2 , the results showed that the Sb / C negative electrode showed good electrochemical activity in the two kinds of phosphate non-flammable electrolytes. It showed high cycle stability, and the capacity retention rates after 80 weeks were 97% and 108%, respectively. This extends the application of nonflammable phosphate ester electrolytes in alloy anodes.

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Abstract

The invention discloses a high-safety incombustible sodium secondary battery system. Incombustible phosphate ester and sodium salt are used as electrolyte of the high-safety incombustible sodium secondary battery system. Incombustible phosphate ester solvents are structurally characterized in that an R<1>, an R<2> or an R<3> in a formula of R<1>OP(O)OR<2>OR<3> represent alkylaryl, halogen-substituted alkyl or aryl and the like and can be symmetric, asymmetric and circular, and halogen can be partially substituted or completely substituted and is F, Cl or Br and the like; cathodes are made of hard carbon, alloy and NaTi<2>(PO<4>)<3> cathode materials, and the alloy cathodes comprise antimonic, tin bases, compounds of the antimonic and the tin bases and the like; anode materials comprise NaFePO<4>, Na<3>V<2>(PO<4>)<3>, NaNi<0.35>Mn<0.35>Fe<0.3>O<2> and the like. The high-safety incombustible sodium secondary battery system has the advantages that the sodium secondary battery system is incombustible, is high in safety and excellent in cycle performance and has high specific energy.

Description

technical field [0001] The invention relates to a high-safety sodium secondary battery system, in particular to a system in which an electrolyte containing non-flammable phosphate ester as a solvent is applied to an alloy negative electrode, and belongs to the technical field of electrochemical and chemical power supply products. Background technique [0002] Due to the high abundance, wide distribution and low price of sodium on the earth, sodium-ion batteries as a large-scale energy storage power source have attracted widespread attention from researchers at home and abroad, and may become a promising energy storage system after lithium-ion batteries. New battery technology. However, for Na-ion batteries, in addition to the low-cost and long-life electrode materials, safety concerns are also particularly prominent, mainly due to the fact that Na has a higher chemical activity than Li, resulting in a stronger reactivity with the electrolyte. and fire and explosion hazards....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M10/0569H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/054H01M10/0569Y02E60/10
Inventor 曹余良杨汉西曾子琪艾新平
Owner WUHAN UNIV