A kind of cobalt-free lithium-rich manganese-based positive electrode material and its preparation method and application

A cobalt-rich lithium-manganese-based, positive electrode material technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low cycle times, small battery specific capacity, poor performance, etc., and achieve complete crystal structure, The effect of many cycles and stable performance

Active Publication Date: 2016-08-17
湘乡绿锂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-rich manganese-based cathode material particles synthesized by the existing sol-gel method are relatively dispersed, the size cannot reach the nanometer level, and the crystal structure is relatively incomplete. The resulting battery has a small specific capacity, fewer cycles, and poor performance.

Method used

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  • A kind of cobalt-free lithium-rich manganese-based positive electrode material and its preparation method and application
  • A kind of cobalt-free lithium-rich manganese-based positive electrode material and its preparation method and application
  • A kind of cobalt-free lithium-rich manganese-based positive electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]1) Dissolve 0.6mol of lithium acetate, 0.2mol of nickel nitrate and 0.2mol of manganese acetate in absolute ethanol, stir well and add polyethylene glycol with a molecular weight of 400 (ie, PEG 400 ), the resulting solution was stirred at 80°C at a stirring speed of 600r / min for 12h to obtain a green gel;

[0031] 2) The green gel is pretreated at low temperature in the furnace to obtain a brown-black loose substance, and then the brown-black loose substance is ball-milled for 2 hours to make it uniform, and then high-temperature treatment is carried out in the furnace; finally, the obtained The material is ground and sieved to obtain a cobalt-free lithium-rich manganese-based positive electrode material;

[0032] Among them, the low-temperature pretreatment process is as follows: the green gel is heated to 400°C at a heating rate of 3°C / min in an air atmosphere, kept for 60 minutes, and then cooled to room temperature with the furnace;

[0033] The high-temperature tr...

Embodiment 2

[0042] 1) Dissolve 0.6 mol of lithium acetate, 0.1 mol of nickel acetate and 0.3 mol of manganese acetate in deionized water, stir well and add polyethylene glycol with molecular weight of 1000 (ie PEG 1000 ), the resulting solution was stirred at 80°C at a stirring speed of 700r / min for 12h to obtain a green gel;

[0043] 2) The green gel is pretreated at low temperature in the furnace to obtain a brown-black loose substance, and then the brown-black loose substance is ball-milled for 5 hours to make it uniform, and then high-temperature treatment is carried out in the furnace; finally, the obtained material after high-temperature treatment Grinding and sieving to obtain a cobalt-free lithium-rich manganese-based positive electrode material;

[0044] Among them, the low-temperature pretreatment process is as follows: the green gel is heated to 500°C at a heating rate of 5°C / min in an air atmosphere, kept for 30 minutes, and then cooled to room temperature with the furnace;

...

Embodiment 3

[0053] 1) Dissolve 0.6 mol of lithium nitrate, 0.2 mol of nickel nitrate and 0.2 mol of manganese nitrate in absolute ethanol, stir well and add polyethylene glycol with a molecular weight of 10000 (i.e. PEG 10000 ), the resulting solution was stirred at 80°C for 12 hours at a stirring speed of 800r / min to obtain a green gel;

[0054] 2) The green gel is pretreated at low temperature in the furnace to obtain a brown-black loose substance, and then the brown-black loose substance is ball-milled for 5 hours to make it uniform, and then high-temperature treatment is carried out in the furnace; finally, the obtained material after high-temperature treatment Grinding and sieving to obtain a cobalt-free lithium-rich manganese-based positive electrode material;

[0055] Among them, the low-temperature pretreatment process is as follows: the green gel is heated to 400°C at a heating rate of 5°C / min in an air atmosphere, kept for 60 minutes, and then cooled to room temperature with the...

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Abstract

The invention discloses a cobalt-free lithium-rich manganese-based cathode material as well as a preparation method and application thereof. The cathode material has a chemical formula Li[1+x]Ni[y]Mn[0.8-y]O2 (x is more than 0 and less than 1 / 3 and y is more than 0 and less than 0.8). The preparation method comprises the following steps: preparing a precursor in an ethanol or de-ionized water solvent by adopting a sol-gel method, pre-sintering at the low temperature, performing ball-milling, and performing high-temperature solid-phase sintering to obtain the cathode material. The cathode material prepared by adopting the method is applied to lithium ion batteries, is high in specific discharge capacity (278mAh / g) and energy density, is expected to replace commercialized mainstream products-LiCoO2 cathode materials and lithium iron phosphate power batteries, and becomes a novel material of high-specific-capacity cathode materials for electric vehicles at present.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a cobalt-free lithium-rich manganese-based positive electrode material and a preparation method and application thereof. Background technique [0002] Energy shortage and environmental pollution are one of the problems that countries in the world are facing urgently. According to the statistics of relevant experts, the exhaust gas emitted by automobiles accounts for 30%-60% of the air pollution. With the increase of the use of automobiles, the pollution of automobile exhaust gas is becoming more and more serious, which has caused great harm to people's physical and mental health and living environment. On the other hand, these non-renewable petrochemical resources that humans rely on will be exhausted day by day, and it is difficult to be recycled. Electric vehicles have the advantages of energy saving, environmental protection an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 柳永宁严武卫
Owner 湘乡绿锂新材料科技有限公司
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