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Lithium ion selenium battery with long service life

A lithium-ion battery and electrolyte technology, applied in the field of electrochemical power supply, can solve problems such as corrosion, battery short circuit, and potential safety hazards, and achieve the effects of good safety, long life and high specific capacity

Active Publication Date: 2014-04-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of battery design still cannot avoid many problems existing in batteries that use metal lithium as the negative electrode in the traditional sense. First, the lithium negative electrode is easy to form lithium dendrites during the charging and discharging process, causing short circuit and explosion of the battery, which brings safety hazards.
Secondly, during the charging and discharging process of lithium-selenium batteries, polyselenides dissolve in the electrolyte, and polyselenides migrate to the lithium negative electrode and react with them, causing uneven dissolution and corrosion of the lithium negative electrode, which affects the cycle performance of the battery.

Method used

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  • Lithium ion selenium battery with long service life
  • Lithium ion selenium battery with long service life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. Assembly of ternary positive electrode / selenium micro-mesoporous carbon composite negative electrode full battery and its electrochemical performance test

[0024] 1-1 Preparation of positive electrode

[0025] According to the ternary cathode material (LiCo 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 ): carbon black: polyvinylidene fluoride = 8:1:1 ratio (mass ratio) mixed, mixed evenly, coated on the current collector, vacuum dried, sliced ​​to obtain a ternary positive electrode.

[0026] 1-2 Preparation of negative electrode

[0027] Mix according to the ratio (mass ratio) of selenium micro-mesoporous carbon composite: Ketjen black: sodium carboxymethyl cellulose / styrene-butadiene rubber = 8:1:1, after mixing evenly, coat it on the current collector, and vacuum After drying and slicing, the selenium micro-mesoporous carbon negative electrode is obtained.

[0028] 1-3 full battery assembly

[0029] Insert a glass fiber membrane (Whatman, UK) between the positive and negati...

Embodiment 2

[0040] Example 2. Assembly of ternary positive electrode / selenium-porous titanium dioxide composite negative electrode full battery and its electrochemical performance test

[0041] 2-1 Preparation of positive electrode

[0042] According to the ternary cathode material (LiCo 0.2 Ni 0.4 mn 0.4 o 2 ): carbon black: polytetrafluoroethylene = 8:1:1 ratio (mass ratio) mixed, mixed evenly, coated on the current collector, dried in vacuum and sliced ​​to obtain a ternary positive electrode.

[0043] 2-2 Preparation of negative electrode

[0044] According to the ratio (mass ratio) of selenium-porous titanium dioxide composite: Ketjen black: cyclodextrin = 8:1:1 (mass ratio), mix evenly, coat on the current collector, vacuum dry and slice to obtain selenium- Porous titanium dioxide composite negative electrode.

[0045] Assembly of 2-3 full cells

[0046] Insert a glass fiber membrane (Whatman, UK) between the positive and negative electrodes as a separator, add carbonate elec...

Embodiment 3

[0049] Example 3. Assembly of ternary positive electrode / selenium-polythiophene composite negative electrode full battery and its electrochemical performance test

[0050] 3-1 Preparation of positive electrode

[0051] According to the ternary cathode material (LiCo 0.2 Ni 0.5 mn 0.3 o 2 ): carbon black: polyvinylpyrrolidone = 8:1:1 ratio (mass ratio) mixed, mixed evenly, coated on the current collector, dried in vacuum and sliced ​​to obtain a ternary positive electrode.

[0052] 3-2 Preparation of negative electrode

[0053] Mix according to the ratio (mass ratio) of selenium-polythiophene composite: carbon black: gelatin = 8:1:1, mix evenly, coat on the current collector, vacuum dry and slice to obtain selenium-polythiophene composite negative electrode.

[0054] 3-3 Assembly of full battery

[0055] A glass fiber membrane (Whatman, UK) was inserted between the positive and negative electrodes as a separator, and an ether electrolyte [1M LiTFSI TEG / DME (mass ratio 1:...

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Abstract

The invention discloses a novel lithium ion battery system with long service life. A lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the negative electrode comprises elemental selenium or a composite thereof and an adhesive; the adhesive comprises a water-soluble adhesive. The lithium ion battery provided by the invention has the characteristics of high safety, high specific capacity and circulating stability.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, in particular to a long-life lithium ion battery and a selenium battery. Background technique [0002] The currently commercialized lithium-ion battery anode materials are generally carbon materials, such as graphite, soft carbon (such as coke, etc.) and hard carbon. However, the carbon negative electrode will form a passivation layer (SEI layer) in the electrolyte, causing an irreversible loss of initial capacity; and the electrode potential of carbon is very close to that of metal lithium (100mV vs Li + / Li), which may lead to overcharging or low-temperature charging process to precipitate metal lithium on the surface of the carbon electrode to form lithium dendrites and cause a short circuit; secondly, at high temperatures, the decomposition of the protective layer on the carbon negative electrode will cause the battery to catch fire; During the charge and discharge process, the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/058
CPCH01M4/362H01M4/38H01M4/621H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 郭玉国叶欢殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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