Composite positive electrode material, preparation method thereof and aqueous secondary battery

A composite positive electrode material and mixture technology, applied in the field of energy storage, can solve the problems of volume shrinkage, volume expansion, poor cycle life, etc., achieve the effects of volume expansion and shrinkage reduction, increase energy density, and increase compaction density
CN111477859AInactive Publication Date: 2020-07-31NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
Publication Date
2020-07-31
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a composite positive electrode material capable of being used for a long-cycle lithium ion battery. The composite positive electrode material comprises modified lithium manganate and modified lithium cobalt oxide, and aluminum hydroxide and neodymium oxide which coat the surfaces of the modified lithium mangnate and the modified lithium cobalt oxide. Wherein the modified lithium manganate is doped with aluminum and cobalt elements; wherein the modified lithium cobalt oxide is doped with a magnesium element. The invention also discloses a preparation method of the composite positive electrode material and an aqueous secondary battery. According to the composite positive electrode material, the composite positive electrode material is synthesized by adopting a high-temperature solid-phase method, so that double modification of material doping and coating is realized, the technological process is greatly simplified, the compaction density of an electrode plate in the battery preparation process and the cycling stability in the battery cycling process are improved, and large-scale production is facilitated.
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Description

Technical field

[0001] The application relates to a composite positive electrode material, a preparation method thereof and an aqueous secondary battery, belonging to the field of energy storage. Background technique

[0002] Currently, the most widely used cathode material for water-based secondary batteries is lithium manganate material, but there are still major problems in electrochemical performance. Lithium manganate is considered to be the most promising cathode material for water-based batteries due to its wide range of raw materials, low price and high specific capacity. However, during charging and discharging, the manganese ions in the crystal lattice are prone to disproportionation reaction and dissolve in the aqueous solution. Therefore, it will cause serious capacity degradation during the cycle. The structure of lithium manganate changes during the charge and discharge process, the volume shrinks during the charging process, and the volume expands during the discha...

Claims

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