a secondary battery

A secondary battery and electrolyte technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of battery capacity decline and shortened cycle life, and achieve long cycle life, high Coulomb efficiency, and low chemical reaction activity. Effect
CN103972582BActive Publication Date: 2016-03-30NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Publication Date
2016-03-30

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Abstract

The invention provides a secondary battery. The secondary battery comprises a positive electrode, a negative electrode, and an isolating membrane and electrolyte which are arranged between the positive electrode and the negative electrode; the positive electrode comprises a divalent metal ion iron cyanide complex; the secondary battery adopts the divalent metal ion iron cyanide complex as an positive electrode active material; the divalent metal ion iron cyanide complex is of a rhombohedral structure, belongs to the R-3c space group, and uses (Fe(CN)6) as a structural unit so that a three-dimensional frame network with a special pore passage structure is formed. positive ions can be rapidly embedded into and released from pore passages in a three-dimensional frame, and the three-dimensional frame is stable during embedding and releasing of the positive ions; the secondary battery adopting the divalent metal ion iron cyanide complex as the positive electrode active material has the high coulombic efficiency and the long cycle life; the divalent metal ion iron cyanide complex has the low reaction activity and the prepared battery is difficult to explode.
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Description

technical field

[0001] The invention belongs to the field of batteries, in particular to a secondary battery. Background technique

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be activated by charging the active material after the battery is discharged and continue to be used. The secondary battery realizes the conversion between electrical energy and chemical energy through the insertion and extraction of metal ions between the positive and negative electrodes. When charging, the metal ions are extracted from the positive electrode and embedded in the negative electrode. positive electrode.

[0003] Due to its high energy density and long service life, lithium-ion secondary batteries have been widely used, but due to the high chemical reactivity and low melting point of metallic lithium, it is difficult to withstand accidents or abuse. Lithium metal is prone to violent reactions with electrolyte and a...

Claims

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