Closed lithium ion battery positive electrode based on oxyanion oxidation/reduction, and preparation method of closed lithium ion battery positive electrode

A lithium-ion battery and oxygen anion technology, applied in the field of electrochemistry, can solve the problems of complex lithium-air battery structure and implementation difficulties, and achieve the effects of high-quality specific capacity, large capacity, and high reversibility

Pending Publication Date: 2020-07-31
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This further complicates the structure of lithium-air batteries, making it difficult to realize

Method used

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  • Closed lithium ion battery positive electrode based on oxyanion oxidation/reduction, and preparation method of closed lithium ion battery positive electrode
  • Closed lithium ion battery positive electrode based on oxyanion oxidation/reduction, and preparation method of closed lithium ion battery positive electrode
  • Closed lithium ion battery positive electrode based on oxyanion oxidation/reduction, and preparation method of closed lithium ion battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 30 mg of iridium chloride, 192 mg of citric acid, and 10 mg of graphene oxide, add them into 24 ml of benzyl alcohol, mix them in a closed container, and ultrasonicate for 1 hour. The uniformly mixed solution was transferred to a high-pressure reactor, and the temperature was raised to 160° C. at a constant speed, kept for 5 hours and then cooled naturally, and the solution was continuously stirred during the whole process. The resulting jelly was centrifuged and washed and dried with a mixed solvent of ethanol and acetone to obtain an elemental iridium / graphene composite material. Thermogravimetric analysis showed that the loading of elemental iridium was 66.73%.

[0030] Weigh 15 mg of elemental iridium / graphene composite material and 35 mg of lithium oxide, and mix the elemental iridium / graphene catalyst and lithium oxide active material in an inert gas atmosphere by mechanical ball milling. The ratio of catalyst to active material is 3:7. The inert gas is ni...

Embodiment 2

[0038] The positive electrode prepared in Example 1 and the lithium-silicon alloy negative electrode were assembled into a battery, specifically:

[0039]The silicon negative plate was prepared by coating film method. Weigh silicon powder, conductive carbon black super P and sodium alginate binder according to the mass ratio of 60:20:20, add an appropriate amount of deionized water, and mix and stir to obtain a uniform slurry. The mixed slurry was coated on a copper foil current collector, and vacuum-dried at 80° C. to obtain a silicon negative electrode. Cut the silicon electrodes into discs with a tablet press. In a glove box with an argon atmosphere, use an R2032 button battery, and first package the silicon negative electrode in the order of negative electrode shell, spring leaf, gasket, metal lithium, separator, silicon electrode, and positive electrode shell. Use the current density of 0.05C (1C=4200mAh / g) to pretreat the silicon negative electrode for 3 cycles, and th...

Embodiment 3

[0043] The simple iridium / graphene composite material was prepared according to the method in Example 1.

[0044] During the preparation of the electrode, the active material was replaced with lithium peroxide. Weigh 10 mg of elemental iridium / graphene composite material and 40 mg of lithium peroxide, and mix the elemental iridium / graphene catalyst and lithium peroxide active material in an inert gas atmosphere by mechanical ball milling. The ratio of catalyst to active material is 1:4. The inert gas is nitrogen or argon. The ball milling time was 125 hours. Finally, the positive electrode active powder is obtained.

[0045] Transfer the positive electrode active powder to an argon atmosphere, grind and mix the positive electrode active powder and binder evenly at a mass ratio of 8:2, add an appropriate amount of N-methylpyrrolidone, stir evenly, and coat on the aluminum foil current collector . The electrodes were dried under vacuum conditions to obtain a closed lithium-...

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Abstract

The invention discloses an oxygen anion oxidation/reduction-based closed lithium ion battery positive electrode and a preparation method thereof. The positive electrode takes lithium oxide as an active material and is converted between lithium oxide and lithium peroxide or lithium superoxide under the action of a catalyst, wherein the process is carried out in a solid phase state, the active material is lithium oxide under a full discharge condition, the active material is lithium peroxide or the lithium superoxide under a full charge condition, and the catalyst is a noble metal simple substance/oxide, a transition metal oxide or a carbon/noble metal alloy. Compared with the prior art, the oxygen anion oxidation/reduction-based closed lithium ion battery positive electrode has the following advantages that (1) high mass specific capacity is achieved by utilizing redox of an oxygen element with relatively small stoichiometry, and a stable battery working environment is ensured by adopting a closed battery structure; and (2) the positive electrode of the battery is large in capacity and high in reversibility.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a novel lithium ion battery positive electrode, in particular to a closed lithium ion battery positive electrode based on oxygen anion oxidation / reduction and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries are limited by the electrode materials themselves, and their energy density has gradually encountered a bottleneck in the development in recent years. Lithium-air battery is an emerging battery system in recent years. Thanks to its use of oxygen that is not stored inside the battery (from the air) at the positive electrode, and the use of high specific energy (3860mAh / g) and low operating voltage (0V vs. Li / Li + ) metal lithium as the negative electrode, lithium-air batteries are expected to become a power system capable of driving electric vehicles. However, lithium-air batteries are a semi-open system, and oxygen is cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/483H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 周豪慎乔羽江克柱邓瀚
Owner NANJING UNIV
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