Preparation method for improving positive electrode material LiCoO2 electrical performance

A technology of positive electrode material and electrical performance, which is applied in the field of preparation of lithium cobalt oxide conductivity modification for lithium ion battery positive electrode material, can solve the problems of low capacity, inability to realize high-rate charge and discharge, poor conductivity, etc., and achieve high capacity, Superior rate charge and discharge performance, excellent processing performance

Inactive Publication Date: 2013-04-17
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, with the high progress of aerospace technology and military technology, electronic information equipment is increasingly developing in the direction of lightweight, miniaturization and portability. Poor, low capacity, unable to achieve high rate charge and discharge

Method used

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  • Preparation method for improving positive electrode material LiCoO2 electrical performance
  • Preparation method for improving positive electrode material LiCoO2 electrical performance
  • Preparation method for improving positive electrode material LiCoO2 electrical performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: An improved cathode material LiCoO 2 The preparation method of electrical properties is characterized in that: it is completed according to the following steps:

[0022] 1) Select battery-grade lithium carbonate from Sichuan Tianqi Lithium Industry Co., Ltd. and GB-100 model cobalt tetroxide from Ningbo Kebot Cobalt and Nickel Co., Ltd. as raw materials, and make the ratio according to the molar ratio of lithium to cobalt 1.035:1. Add TiO 2 , ZrO 2 and Nb 2 o 5 As additive T1, where TiO 2 The added weight is 0.12% of the weight of tricobalt tetroxide, ZrO 2 The added weight is 0.1% of the weight of tricobalt tetroxide, Nb 2 o 5 The added weight of is 0.15% of the weight of tricobalt tetroxide. The battery-grade lithium carbonate, GB-100 model cobalt tetroxide, TiO 2 , ZrO 2 and Nb 2 o 5 Perform doping and mixing, and mix well.

[0023] 2) Put the uniformly mixed material obtained in 1) into a refractory sagger, push it into a high-temperature pus...

Embodiment 2

[0028] Example 2: An improved cathode material LiCoO 2 The preparation method of electrical properties is characterized in that: it is completed according to the following steps:

[0029] 1) Select battery-grade lithium carbonate from Sichuan Tianqi Lithium Industry Co., Ltd. and GB-100 model cobalt tetroxide from Ningbo Kebot Cobalt Nickel Co., Ltd. as raw materials, and mix according to the molar ratio of lithium to cobalt 1.045:1. Add TiO 2 , CeO 2 and Nb 2 o 5 As additive T1, where TiO 2 The added weight is 0.12% of the weight of tricobalt tetroxide, ZrO 2 The added weight is 0.1% of the weight of tricobalt tetroxide, Nb 2 o 5 The added weight of is 0.15% of the weight of tricobalt tetroxide. The battery-grade lithium carbonate, GB-100 model cobalt tetroxide, TiO 2 , ZrO 2 and Nb 2 o 5 Perform doping and mixing, and mix well.

[0030] 2) Put the homogeneously mixed material obtained in 1) into a refractory sagger, push it into a high-temperature pusher kiln, k...

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Abstract

The invention discloses a preparation method for improving the positive electrode material LiCoO2 electrical performance. The preparation method for improving the positive electrode material LiCoO2 electrical performance is completed according to the following steps of: mixing cobaltosic oxide and lithium salt (adding an additive T1); pretreating; sintering for the first time at the temperature of 600-11000 DEG C for 6-20 hours; carrying out surface treatment; mixing for the second time; pretreating; sintering in an inert atmosphere at 400-800 DEG C for 5-10 hours, and sintering for the second time at low temperature; and carrying out surface treatment, thereby obtaining the product. Modified lithium cobalt oxides prepared by the method provided by the invention not only have the original properties, but also can achieve high-magnification high-current charge and discharge; a battery prepared from lithium sheets as negative electrode materials tests, the test current magnification is 0.2C, and the voltage range is 2.9V-4.2V; the specific capacity of the tested material is greater than 160mAh / g in circulation for 100 times; the discharge platform retention rate is above 85%; and the capacity retention rate is above 95%.

Description

technical field [0001] The invention relates to a preparation method for modifying the conductivity of lithium cobalt oxide, a cathode material of a lithium ion battery, and belongs to the technical field of new energy and high efficiency and energy saving-new high-efficiency energy conversion and storage technology and related product preparation. Background technique [0002] Lithium cobalt oxide is the positive electrode material of lithium-ion batteries and a key component of lithium-ion batteries, accounting for about one-third of the cost of lithium-ion battery cell materials. Lithium-ion battery cathode material for wide commercial application. Lithium cobaltate, as the mainstream positive electrode material of lithium-ion batteries, is widely used in the batteries of small mobile electronic products such as mobile phones, laptop computers, cameras, etc. Generally, these fields belong to small current discharge. Nowadays, with the high progress of aerospace technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62C01G51/00
CPCY02E60/10
Inventor 陈军黄兵
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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