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Carbon doped lithium-rich manganese based solid solution composite and preparation method thereof

A carbon-lithium-rich manganese-based and lithium-rich manganese-based technology is applied in the field of carbon-doped lithium-rich manganese-based solid solution composite materials and their preparation, which can solve the problems of poor rate performance and achieve short cycle times, high efficiency, and improved rate performance. Effect

Inactive Publication Date: 2015-01-21
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect of poor rate performance of lithium-rich manganese-based solid solution as the positive electrode material of lithium ion batteries, and prepare lithium ion battery positive electrode materials with higher rate discharge specific capacity and excellent high rate cycle performance

Method used

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Embodiment 1

[0020] A carbon-doped lithium-rich manganese-based solid solution composite material, wherein the composite material is characterized in that the general formula of the lithium-rich manganese-based solid solution structure is xLi 2 MnO 3 ·(1-x)LiMO 2 , wherein M is Cr, x=0.5; it is characterized in that the lithium-rich manganese-based solid solution is dispersed in the interlayer of layered graphene in the form of particles; the size of the lithium-rich manganese-based solid solution dispersed between the graphene layers is about 2 μm, The layered graphene thickness is about 26 nm.

[0021] The preparation of the carbon-doped lithium-rich manganese-based solid solution composite material of the present invention can be prepared by the following method, which includes the following steps:

[0022] (1) Prepare the precursor by the coprecipitation method, add the mixed solution containing the salt of M and Mn, the NaOH solution as the precipitating agent and the ammonia soluti...

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Abstract

The invention provides a carbon doped lithium-rich manganese based solid solution composite and a preparation method thereof, suitable for the technical field of energy materials. A general structural formula of a carbon doped lithium-rich manganese based solid solution is xLi2MnO3.(1-x)LiMO2, wherein M is Cr, and x is greater than 0 and smaller than 1. The carbon doped lithium-rich manganese based solid solution composite is characterized in that the carbon doped lithium-rich manganese based solid solution is dispersed in the interlayer of layered graphene in a particle mode. The carbon doped lithium-rich manganese based solid solution composite can be used as an anode material of a lithium ion battery and is capable of effectively improving the electrical conductivity of a lithium-rich manganese based solid solution. The preparation method has the characteristics of being simple in process, low in cost and suitable for mass production.

Description

technical field [0001] The invention relates to a carbon-doped lithium-rich manganese-based solid solution composite material and a preparation method thereof, belonging to the technical field of electrochemistry and material synthesis. Background technique [0002] Lithium-rich manganese-based solid solution cathode material xLi with layered structure 2 MnO 3 ·(1-x)LiMO 2 (where M is a transition metal, 0<x<1) the theoretical specific capacity exceeds 300mAh g -1 , the actual available capacity is greater than 250mAh·g -1 , which is about twice the actual capacity of the currently used positive electrode material; 2 and LiNi1 / 3Mn1 / 3Co1 / 3O 2 Compared with it, it also has the advantages of low cost, good safety, and environmental friendliness. Therefore, xLi 2 MnO 3 ·(1-x)LiMO 2 It is regarded as an ideal choice for the cathode material of the next generation of lithium-ion batteries. However, its poor rate performance limits its further development in commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505
CPCH01M4/366H01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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