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High-nickel ternary positive electrode material coated with lithium aluminum titanium phosphate and preparation method thereof

A technology of lithium aluminum titanate phosphate and cathode material, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problem that the battery cycle performance cannot be effectively improved, so as to improve the capacity retention rate, inhibit micro-cracks, and inhibit the capacity. the effect of decay

Inactive Publication Date: 2019-08-09
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, people mainly use surface coating to improve the performance of ternary high-nickel materials. Common coating materials include metal oxides, fluorides, phosphates, etc., but the cycle performance of batteries after coating cannot be effectively improved. improvement

Method used

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  • High-nickel ternary positive electrode material coated with lithium aluminum titanium phosphate and preparation method thereof
  • High-nickel ternary positive electrode material coated with lithium aluminum titanium phosphate and preparation method thereof
  • High-nickel ternary positive electrode material coated with lithium aluminum titanium phosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a high-nickel ternary positive electrode material coated with titanium aluminum phosphate, comprising the steps of:

[0022] (1) Preparation of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating solution: Weigh 0.013mol LiNO according to the number of moles 3 , 0.003mol Al(NO 3 ) 3 9H 2 O, 0.017mol tetrabutyl titanate and 0.03mol tributyl phosphate; the above LiNO 3 , Al(NO 3 ) 3 9H 2O. Tetrabutyl titanate and tributyl phosphate were added to 30 mL of ethanol and mixed evenly, heated at 80° C. and stirred for 30 min to obtain the first mixed solution; 0.016 mol ethylenediamine tetraacetic acid and 0.0224 mol citric acid were weighed by moles, and EDTA and citric acid were added to 10ml ethanol and mixed uniformly to obtain a second mixed solution; the second mixed solution was poured into the first mixed solution and stirred to obtain 52.6gLi 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating solution, where Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The number of...

Embodiment 2

[0026] A preparation method of a high-nickel ternary positive electrode material coated with titanium aluminum phosphate, comprising the steps of:

[0027] (1) Preparation of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating solution: Weigh 0.013mol LiNO according to the number of moles 3 , 0.003mol Al(NO 3 ) 3 9H 2 O, 0.017mol tetrabutyl titanate and 0.03mol tributyl phosphate; the above LiNO 3 , Al(NO 3 ) 3 9H 2 O. Tetrabutyl titanate and tributyl phosphate were added to 30 mL of ethanol and mixed evenly, heated at 80° C. and stirred for 30 min to obtain the first mixed solution; 0.016 mol ethylenediamine tetraacetic acid and 0.0224 mol citric acid were weighed by moles, and EDTA and citric acid were added to 10ml of ethanol and mixed uniformly to obtain a second mixed solution; the second mixed solution was poured into the first mixed solution and stirred to obtain 53.1g Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating fluid.

[0028] (2) Preparation of Li[Ni 0.90 co 0.05 mn ...

Embodiment 3

[0031] A preparation method of a high-nickel ternary positive electrode material coated with titanium aluminum phosphate, comprising the steps of:

[0032] (1) Preparation of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating solution: Weigh 0.013mol LiNO according to the number of moles 3 , 0.003mol Al(NO 3 ) 3 9H 2 O, 0.017mol tetrabutyl titanate and 0.03mol tributyl phosphate; the above LiNO 3 , Al(NO 3 ) 3 9H 2 O. Tetrabutyl titanate and tributyl phosphate were added to 30 mL of ethanol and mixed evenly, heated at 80° C. and stirred for 30 min to obtain the first mixed solution; 0.016 mol ethylenediamine tetraacetic acid and 0.0224 mol citric acid were weighed by moles, and EDTA and citric acid were added to 10ml ethanol and mixed uniformly to obtain a second mixed solution; the second mixed solution was poured into the first mixed solution and stirred to obtain 55.2gLi 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 Coating fluid.

[0033] (2) Preparation of Li[Ni 0.90 co 0.05 mn 0.0...

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Abstract

The invention relates to the field of positive electrode materials for lithium-ion batteries and particularly relates to a high-nickel ternary positive electrode material coated with lithium aluminumtitanium phosphate and a preparation method thereof. The method comprises the steps of (1) preparing a lithium aluminum titanium phosphate coating solution including the steps of uniformly mixing LiNO3, Al(NO3)3-9H2O, tetrabutyl titanate and tributyl phosphate in ethanol, then slowly adding ethylenediaminetetraacetic acid and citric acid, and uniformly stirring to obtain the lithium aluminum titanium phosphate coating solution, and (2) coating including the steps of adding the high-nickel ternary positive electrode material into the lithium aluminum titanium phosphate coating solution, uniformly stirring, and orderly performing drying and calcination steps to obtain the high-nickel ternary positive electrode material coated with the lithium aluminum titanium phosphate. The high-nickel ternary positive electrode material is coated with a lithium aluminum titanium phosphate material with high structural stability, since the high structural stability of the lithium aluminum titanium phosphate facilitates the suppression of the side reaction of a high nickel material, therefore, the occurrence of micro cracks is suppressed, the attenuation of the capacity is suppressed, and the capacity retention rate is improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a high-nickel ternary positive electrode material coated with lithium titanium aluminum phosphate and a preparation method thereof. Background technique [0002] In recent years, the high-nickel ternary cathode material (NCM) of ternary materials has been considered as one of the most promising cathode materials due to its advantages of high energy density, good cycle performance, and high safety performance. [0003] However, the capacity of high-nickel NCM materials is prone to rapid fading, which is mainly attributed to the unstable Ni 4+ The presence. During the charging process of NCM cathode materials, microcracks will undergo anisotropic volume change, which will damage the mechanical stability of the cathode and aggravate the chemical degradation due to electrolyte erosion; in addition, the Ni in the transition metal layer 2+ Occupyi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 杨志远王聪张天赐
Owner 湖北锂诺新能源科技有限公司
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