Lithium ion battery cathode material and preparation method

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., to achieve the effects of reduced consumption, wide range of raw materials, and easy mass production

Inactive Publication Date: 2009-09-16
UNIV OF SCI & TECH OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of further improving the overall capacity of the battery, the p

Method used

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  • Lithium ion battery cathode material and preparation method
  • Lithium ion battery cathode material and preparation method
  • Lithium ion battery cathode material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] see figure 1 , respectively take 2.068g of lithium nitrate LiNO 3 and 12.12g of iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 O (that is, the molar ratio of Li:Fe is 1:1), fully dissolved in 75ml of water by stirring, then add 25ml of acrylic acid, after mixing evenly, a mixed aqueous solution is obtained, take 5ml of the mixed aqueous solution and heat and polymerize at 180°C until drying (approximately 4 hours), to obtain black xerogel, then grind to obtain xerogel powder, this xerogel powder is added in remaining 95ml mixed aqueous solution, after standing at room temperature for 5 hours, mixed aqueous solution forms gel, see figure 2 , then heated to 450°C to decompose the organic matter in the gel, and sintered for 10 hours to obtain ferric oxide / lithium ferrite / lithium oxide Fe 3 o 4 -LiFeO 2 -Li 2 O composite powder.

[0033] With the ferric oxide / lithium ferrite / lithium oxide Fe that embodiment 1 makes 3 o 4 -LiFeO 2 -Li 2 O composite powder is used as ...

Embodiment 2

[0036] Take 1.034g of lithium nitrate LiNO respectively 3 and 3.03g of iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 O (i.e. the molar ratio of Li:Fe is 2:1), stirred and dissolved in 75ml of water, then added 25ml of acrylic acid, after mixing evenly, a mixed aqueous solution was obtained, and 5ml of the mixed aqueous solution was heated and polymerized at 120°C until dried. Obtain black dry gel, then grind to obtain dry gel powder, add this dry gel powder to the remaining 95ml mixed aqueous solution, after 5 hours, mix the aqueous solution to form a gel, then heat to 750°C to decompose the organic matter in the gel, Sintering for 10 hours to obtain ferric oxide / lithium ferrite / lithium oxide Fe 3 o 4 -LiFeO 2 -Li 2 O composite powder, using the powder as negative electrode, the measured discharge specific capacity is greater than 1000mAh / g.

Embodiment 3

[0038] Take 0.207g of lithium nitrate LiNO respectively 3 and 12.12g of iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 O (i.e. the molar ratio of Li:Fe is 1:10), stirred and dissolved in 75ml of water, then added 25ml of acrylic acid, after mixing evenly, a mixed aqueous solution was obtained, and 5ml of the mixed aqueous solution was heated and polymerized at 220°C until drying to obtain Black dry gel, then grind to obtain dry gel powder, add the dry gel powder to the remaining 95ml mixed aqueous solution, after 5 hours, mix the aqueous solution to form a gel, then heat to 300°C to decompose the organic matter in the gel, and sinter 10 hours, obtain ferric oxide / lithium ferrite / lithium oxide Fe 3 o 4 -LiFeO 2 -Li 2 O composite powder, using the powder as negative electrode, the measured discharge specific capacity is greater than 1000mAh / g.

[0039] With the Fe that embodiment 3 makes 3 o 4 -LiFeO 2 -Li 2 O composite powder and graphite are mixed at 3:1 and 1:10 to make...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method, and solves problem of further increasing integral capacity of battery. The lithium ion battery cathode material of the invention is ferroferric oxide/lithium ferrate/lithium oxide composite powder, which is prepared by adding prefabricated xerogel powder into solution to initiate polymer monomer polymerization to obtain macromolecular gel, and carrying out thermal decomposition of the obtained gel to obtain the composite powder with uniformly distributed particle size and stable performance. The lithium ion battery cathode can be prepared from the composite powder or mixture of the composite powder and graphite. The invention has high specific capacity which is more than 1000mAh/g and is about three times of that of existing graphite cathode (theoretical capacity is 372mAh/g, and practical capacity is 340mAh/g), and simple method, is easy for large scale production, can form gel at room temperature, and can initiate polymerization without additional initiator, heat source and radiation source.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to negative electrode materials and preparation methods of lithium ion batteries. Background technique [0002] The rapid development and wide application of electric vehicles, wind power and solar power have put forward higher requirements on the performance of chemical power sources, especially lithium-ion batteries. At present, most commercialized lithium-ion batteries use graphite as the negative electrode material. The low theoretical capacity of graphite (372mAh / g) greatly limits the further improvement of the overall capacity of the battery. It is urgent to develop advanced high-capacity negative electrode materials. As a potential alternative anode material with high specific capacity, metal oxides have attracted the attention of scientists and researchers, and have become a research hotspot in recent years. [0003] Among metal oxides, iron-based ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M4/48H01M4/38H01M4/04
CPCY02E60/12Y02E60/10
Inventor 陈春华岳国强王佩春汪颖许瑞赵丰刚陈卫
Owner UNIV OF SCI & TECH OF CHINA
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