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Improved lithium mangnese oxide-based active material

An active material, lithium oxide technology, applied in thin material processing, electrochemical generators, alkaline battery electrodes, etc., can solve the problems of difficulty in obtaining capacity loss, large manganese oxide lithium-based electrode materials, low capacity, etc.

Inactive Publication Date: 2002-03-13
VALENCE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nagaura's LiMn 2 o 4 The compound is a spinel electrode that is not completely crystallized, and has the disadvantage of very low capacity
Despite the above methods, it is still difficult to obtain basic spinel LixMn containing high capacity 2 o 4 Manganese oxide-lithium-based electrode materials without the disadvantage of large capacity loss in subsequent cycles with intercalation compounds

Method used

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  • Improved lithium mangnese oxide-based active material
  • Improved lithium mangnese oxide-based active material
  • Improved lithium mangnese oxide-based active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: use the LMO: LiAlCl that is 96: 4 by weight ratio 4 to prepare

[0052] In this example, the treated lithium manganese oxide was prepared using a lithium aluminum chloride compound. The nominal molecular formula Li of lithium manganese oxide in the present embodiment 1.08 mn 1.92 o 4 , and purchased from Japan Energy Corporation. The molecular formula of lithium aluminum chloride is LiAlCl 4 . It was purchased from Aldrich Chemical Company. This lithium aluminum chloride is known to be hygroscopic. Therefore, the lithium aluminum chloride powder needs to be ground to the desired particle size under argon atmosphere. Finely ground lithium aluminum chloride and lithium manganese oxide powders were mixed and then milled together to obtain a well mixed mixture. The purpose of this is to get as homogeneous a mixture as possible. In this example, the mixture consisted of 4% by weight lithium aluminum tetrachloride and 96% by weight lithium manganese ox...

Embodiment 2

[0059] Example 2: 97:3 LMO:LiAlCl 4

[0060] According to the method described in Example 1, the difference is that the weight percentages of lithium manganese oxide and lithium aluminum chloride are changed. In this example, 3% by weight of lithium aluminum tetrachloride and 97% by weight of lithium manganese oxide were used. As shown in Table 2, this example provided a slightly higher amount of lithium, but essentially no change in cell parameters and peaks. In this example, the cycle performance was also good.

Embodiment 3

[0061] Example 3: 98:2 LMO:LiAlCl 4

[0062] According to the method described in Example 1, the difference is that 2% by weight of lithium aluminum tetrachloride is mixed with 98% lithium manganese oxide, and then heat treatment is carried out according to the method described in Example 1. As can be seen from Table 2, since a smaller amount of metal compound is used, the number of lithium atoms in the product is slightly increased compared with the above examples.

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Abstract

The invention provides an electrochemically active material comprising particles of spinel lithium manganese oxide having on the surface of each particle cationic metal species bound to the spinel at anionic sites of the particle surface; where the cationic metal species includes a metal selected from the group consisting of transition metals, non-transition metals having a +3 valence state, and mixtures thereof. The active material is characterized by a reduced surface area and increased capacity expressed in milliamp hour per gram as compared to the spinel alone.

Description

field of invention [0001] This invention relates to electrochemical cells and batteries, and more particularly to improved electrode active materials and novel synthesis methods for these cells. Background of the invention [0002] Lithium batteries are made from one or more lithium electrochemical cells containing electrochemically active (electroactive) materials. Such batteries generally include an anode (negative electrode), a cathode (positive electrode), and an electrolyte disposed between the positive and negative electrodes spaced apart. Batteries incorporating lithium metal anodes and active materials containing metal chalcogenide cathodes are known. Electrolytes typically contain lithium salts dissolved in one or more solvents, typically non-aqueous (aprotic) organic solvents. Other electrolytes are solid electrolytes. A solid electrolyte is generally a polymer matrix containing an ionically conductive medium (typically a metal powder or salt) mixed with a polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/505H01M10/0525H01M10/36
CPCY02E60/122H01M4/366H01M10/0525H01M4/505Y10T428/2991Y02E60/10H01M4/50
Inventor T·E·凯利P·H·米切尔C·A·斯科迪利斯-凯利
Owner VALENCE TECH INC
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