Silicate positive electrode material for lithium ion power battery, preparation method thereof and lithium ion power battery

A technology for power batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of complex liquid phase synthesis process, uneven mixing, difficult positive electrode materials, etc., and achieve good battery processing performance and high Safety performance, the effect of high compaction density

Active Publication Date: 2009-12-16
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid-phase synthesis method is complicated in process and high in cost, and it is difficult to achieve industrialization. The traditional solid-

Method used

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  • Silicate positive electrode material for lithium ion power battery, preparation method thereof and lithium ion power battery
  • Silicate positive electrode material for lithium ion power battery, preparation method thereof and lithium ion power battery
  • Silicate positive electrode material for lithium ion power battery, preparation method thereof and lithium ion power battery

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preparation example Construction

[0025] The preparation method of lithium ion power battery silicate cathode material of the present invention comprises the following steps:

[0026] 1. Lithium in the lithium source compound: transition metal element: silicon in the silicon source compound is mixed in a molar ratio of 1.9 to 2.1:1:1, and carbon or carbon source compound is added at the same time, and silicon element and carbon or carbon source compound are decomposed to form The carbon molar ratio 1: greater than 0 to 2 forms a raw material mixture.

[0027] The lithium source compound is lithium hydroxide, lithium carbonate, lithium acetate, lithium chloride, lithium sulfate, lithium nitrate, lithium iodide, lithium tert-butoxide, lithium benzoate, lithium formate, lithium fluoride, lithium chromate, Lithium citrate tetrahydrate, lithium tetrachloroaluminate, lithium bromide, lithium tetrafluoroborate, lithium oxalate, or a mixture of two or more in any molar ratio.

[0028] The transition metal element ado...

Embodiment 1

[0040] Example 1: Lithium in lithium hydroxide: manganese element in manganese nitrate: silicon in tetraethylorthosilicate 2: 1: 1 is mixed in molar ratio, add glucose simultaneously, the carbon mole that silicon element and glucose decompose generate The ratio is 1:1 to form a raw material mixture. Disperse the raw material mixture in water, the mass ratio of solid to water is 1:1, and then perform nano-processing in a nano-material preparation device, with a rotation speed of 100r / min, and grind and disperse for 40 hours to prepare the precursor of the silicate cathode material slurry. Put the precursor slurry into the storage tank and let it stand for 0.5h, then ultra-fine grinding, 1000r / min, time 2h, enter another storage tank and let it stand for 0.5h, then enter the dryer for drying treatment, and dry it in the gas phase at 100°C , to obtain a dispersed powder. The dispersed powder was heat-treated at a temperature increase rate of 1°C / min and within a temperature ran...

Embodiment 2

[0043] Example 2: Lithium in lithium carbonate: manganese element in manganese carbonate: silicon in silicon monoxide 1.9: 1: 1 is mixed in molar ratio, polyvinyl alcohol is added simultaneously, the carbon that silicon element and polyvinyl alcohol decompose generates The molar ratio is 1:2 to form a raw material mixture. Disperse the raw material mixture in ethanol, the mass ratio of solid to ethanol is 1.5:1, and then perform nano-processing in a nano-material preparation device at a speed of 500r / min, grind and disperse for 2 hours, and prepare the precursor of the silicate positive electrode material body slurry. Put the precursor slurry into the storage tank and let it stand for 1 hour, then ultra-finely grind it at 2000r / min for 1 hour, enter another storage tank and let it stand for 1 hour, then enter the dryer for drying treatment, and dry it in the gas phase at 200°C to obtain Disperse powder. The dispersed powder was heat-treated at a heating rate of 8°C / min and w...

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Abstract

The invention discloses a silicate positive electrode material for a lithium ion power battery, a preparation method thereof and the lithium ion power battery, and aims to solve the technical problems of improving the electric conductivity and cycle life of the positive electrode material. The positive electrode material of the invention uses LinMSiO4 as the matrix, a carbon material particle layer is wrapped outside the matrix, and the thickness of the carbon material particle layer is between 0.5 and 50 nanometers. The preparation method for the positive electrode material comprises the following steps: preparing precursor slurry by lithium, transition metal elements, silicon and carbon, and performing standing, superfine grinding, standing again, drying, thermal treating and fusion treating on the precursor slurry. The lithium ion power battery is characterized in that the positive electrode material uses LinMSiO4 as the matrix, a carbon material particle layer is wrapped outside the matrix, and the thickness of the carbon material particle layer is between 0.5 and 50 nanometers. Compared with the prior art, the positive electrode material has the advantages of high stacking density, high specific volume amount and good battery processing property; and the power battery made of the positive electrode material has high safety performance, magnification performance and cycle performance.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery and a preparation method thereof, a lithium ion battery, in particular to a positive electrode material for a lithium ion power battery and a preparation method thereof, and a lithium ion battery using the material. Background technique [0002] In recent years, the development of lithium-ion power batteries is in full swing, and the global sales of lithium iron phosphate, a cathode material for power batteries, have grown steadily, which will be of strategic significance to the development of lithium-ion power batteries. As one of the core components of lithium-ion power batteries, the development of cathode materials affects the development of the entire lithium-ion battery industry to a certain extent. Lithium-ion battery cathode materials are mainly divided into three categories: one-dimensional structure, such as olivine-type lithium iron phosphate, two-dimensional st...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04H01M10/36
CPCY02E60/12Y02E60/10
Inventor 岳敏梅佳梁奇贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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