Positive electrode and high-safety and high-cyclicity lithium metal solid-state battery

A solid-state battery, lithium metal technology, used in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as temperature rise, aggravate thermal runaway of cells, and affect battery cycle stability, so as to ensure cycle performance and cycle stability. Longevity, improvement of interfacial contact problems, effect of reducing the possibility of spontaneous combustion
CN114373884APending Publication Date: 2022-04-19ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
Publication Date
2022-04-19

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Abstract

The invention discloses a positive electrode and a lithium metal solid-state battery with high safety and high cyclicity, and belongs to the field of lithium metal solid-state batteries, the positive electrode of the lithium metal solid-state battery comprises an active substance, the bond energy of elements and oxygen in the active substance is greater than 390 kJ / mol, and the decomposition temperature of the active substance is greater than 250 DEG C. The proper active substance is screened out through the bond energy of the chemical bond and the decomposition temperature to serve as the positive electrode of the lithium metal solid-state battery, the active substance with large binding energy of elements and oxygen is selected, and the oxygen evolution reaction of the active substance in the charging process can be effectively reduced, so that the spontaneous combustion possibility of the lithium metal solid-state battery is reduced; the safety of the lithium metal solid-state battery is greatly improved; meanwhile, the selection of the active substance needs to meet the charging cut-off voltage for stabilizing the electrolyte, and the cycling stability of the battery is ensured.
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Description

technical field

[0001] The invention relates to the field of batteries, in particular to a positive electrode and a lithium metal solid-state battery with high safety and high cycle performance. Background technique

[0002] Lithium metal solid-state batteries are widely used in the field of electronic products as renewable clean energy storage devices, which can meet the stringent requirements of emerging industries such as new energy vehicles, and are one of the most promising next-generation high-energy density storage devices.

[0003] However, the safety issues and poor cycling performance of lithium metal solid-state batteries have always limited its practical use. After long-term research by the applicant of this patent, it was accidentally found that in the lithium metal solid-state battery, at the end of charging, the deposition of lithium on the negative electrode is about to end, and micron and nanoscale whiskers or small crystal grains will be formed on the initi...

Claims

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