Modified ferrous lithium phosphate as anode material for lithium ion batteries and its production

A technology for lithium ion batteries and cathode materials, which is applied in the field of modified lithium ferrous phosphate cathode materials for lithium ion batteries, can solve the problems of low specific capacity, difficult industrial production, poor discharge capacity and cycle performance, etc.

Inactive Publication Date: 2005-02-23
GOLDEN DRAGON PRECISE COPPER TUBE GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercialized LiCoO 2 and the widely studied LiNiO 2 with LiMn 2 o 4 Cathode materials have their own advantages, but the synthesis of LiNiO2 is difficult, it is not easy to industrialize production, the actual specific capacity of LiMn2O4 is low, the cycle performance is poor, the cobalt of LiCoO2 is expe

Method used

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  • Modified ferrous lithium phosphate as anode material for lithium ion batteries and its production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] 1. Lithium carbonate, ferrous salt, chromium salt (containing chromium oxide), conductive agent and other materials with the atomic ratio of lithium, iron and M, namely Li / (Fe+M)=1.02, are mixed for 2 hours evenly.

[0007] 2. The powder material obtained in the first processing step is kept at a lower temperature of 400 degrees in an inert atmosphere for 15 hours, and cooled naturally.

[0008] 3. Mix the powder pre-calcined in the second processing step evenly again, then keep it warm at a higher temperature of 650 degrees in an inert atmosphere for 24 hours, cool and ball mill it through a 300-mesh sieve for use.

Embodiment 2

[0010] 1. Lithium carbonate, ferrous salt, chromium salt (containing chromium oxide), conductive agent and other materials with the atomic ratio of lithium, iron and M, namely Li / (Fe+M)=1.04, are mixed for 2 hours evenly.

[0011] 2. The powder material obtained in the first processing step is kept at a lower temperature of 400 degrees in an inert atmosphere for 14 hours, and cooled naturally.

[0012] 3. Mix the powder pre-calcined in the second processing step evenly again, then keep it warm at a higher temperature of 650 degrees in an inert atmosphere for 24 hours, cool and ball mill it through a 300-mesh sieve for use.

Embodiment 3

[0014] 1. Lithium carbonate, ferrous salt, chromium salt (containing chromium oxide), conductive agent and other materials with the atomic ratio of lithium, iron and M, namely Li / (Fe+M)=1.06, are mixed for 2 hours evenly.

[0015] 2. The powder material obtained in the first processing step is kept at a lower temperature of 400 degrees in an inert atmosphere for 18 hours, and cooled naturally.

[0016] 3. Mix the powder pre-calcined in the second processing step evenly again, then keep it warm at a higher temperature of 650 degrees in an inert atmosphere for 24 hours, cool and ball mill it through a 300-mesh sieve for use.

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Abstract

The invention is to supply a positive pole material for the lithium ion battery with the property of excellent performance and low cost, apply the olivine type modification lithium ferrous phosphate as positive material, its molecular formula is presented as LiFl-xMxPO4, in which the M is one or two of the elements as below: Cr, Co Mn, Mg, Ni, La. The producing method mixes the lithium iron modification element M with the phosphor after warming-up and igloss processing in the inert gases, the modification lithium ferrous phosphate with stable structure is produced.

Description

Technical field: [0001] The invention relates to a battery, in particular to a modified lithium iron phosphate cathode material for a lithium ion battery and a production method thereof. Background technique: [0002] The superior performance and non-pollution of lithium-ion batteries have been widely used. The cathode material of lithium-ion batteries is the bottleneck restricting the development of lithium-ion batteries, which determines the performance, price and development of lithium-ion batteries. Commercialized LiCoO 2 and the widely studied LiNiO 2 with LiMn 2 o 4 Cathode materials have their own advantages, but LiNiO2 is difficult to synthesize and not easy to industrialize. LiMn2O4 has low actual specific capacity and poor cycle performance. The cobalt of LiCoO2 is expensive and has few resources, so its development is limited. It has been reported in the literature that the lithium iron phosphate cathode material is synthesized by high temperature solid phase...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01G1/02C01G49/00H01M4/04H01M4/48H01M4/58H01M10/36
CPCH01M4/5825Y02E60/122H01M10/0525Y02E60/10
Inventor 赵丽崔成伟孙科王涛杨书廷赵娜红
Owner GOLDEN DRAGON PRECISE COPPER TUBE GROUP
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