Silicate anodal material for lithium ion battery and preparation method thereof

A lithium-ion battery and positive electrode material technology, applied in the field of lithium-ion battery positive electrode materials and its preparation, can solve the problems of low energy density, low voltage platform, poor conductivity, etc., achieve high volume specific capacity, uniform distribution, and improved The effect of conductivity

Active Publication Date: 2010-01-27
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three materials have different defects: ① layered excessive metal oxide has poor overcharge resistance; ② olivine-type lithium iron phosphate has a low voltage platform, low energy density, and poor conductivity; ③ spinel-type Lithium manganese oxide has poor high temperature performance
However, the silicate cathode material also has the problem of poor conductivity, which makes it difficult to charge and discharge at a high rate. From the existing research results, researchers basically use a solid-phase method to dope different forms of carbon on the surface of the material to improve The conductivity of the material is difficult to guarantee the uniformity of modifier dispersion by using the solid phase method.

Method used

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  • Silicate anodal material for lithium ion battery and preparation method thereof
  • Silicate anodal material for lithium ion battery and preparation method thereof
  • Silicate anodal material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Example 1, the tetrabutyl titanate modifier source accounting for 5.0% of the mass of the positive electrode material was dissolved in ethanol at a concentration of 100 g / l, the stirring speed was 50 r / min, and the time was 0.5 h to obtain a tetrabutyl titanate solution. Will Li 2 mn 0.5 Fe 0.5 SiO 4 Slowly put into the modifier source solution, the stirring speed is 300r / min, and the time is 3.0h to obtain the mixture. The mixture was gas-phase-dried and granulated under the condition of 100° C. to obtain a dispersed powder. The dispersed powder is heat-treated in the temperature range of 200°C for 40 hours at a heating rate of 1°C / min, and naturally cooled to below 150°C, during which air is introduced. Fusion treatment after pulverization, rotating speed 500r / min, time 300 minutes, sieve, obtain the silicate cathode material Li 2 mn 0.5 Fe 0.5 SiO 4 / TiO 2 . tested and analyzed as figure 1 As shown, the surface of the positive electrode material is coated ...

Embodiment 2

[0045] Example 2, the tetrabutyl titanate modifier source accounting for 0.1% of the mass of the positive electrode material was dissolved in absolute ethanol, the concentration was 50g / l, the stirring speed was 300r / min, and the time was 2.5h to obtain tetrabutyl titanate source solution. Silicate cathode material active material Li 2 FeSiO 4 Slowly put into the tetrabutyl titanate source solution, the stirring speed is 500r / min, and the time is 5h to obtain the mixture. The mixture was gas-phase-dried and granulated under the condition of 200° C. to obtain a dispersed powder. The dispersed powder was heat-treated at 450°C for 4 hours at a heating rate of 10°C / min, and then naturally cooled to below 150°C, during which air was introduced. Fusion treatment after pulverization, rotating speed 800r / min, time 15 minutes, sieve, obtain the silicate cathode material Li 2 FeSiO 4 / TiO 2 . After testing and analysis, the surface of the positive electrode material is covered wi...

Embodiment 3

[0047] Example 3, the zirconate modifier source accounting for 10% of the mass of the positive electrode material was dissolved in acetone at a concentration of 0.1 g / l, the stirring speed was 50 r / min, and the time was 5.0 h to obtain a tetrabutyl titanate source solution. Silicate cathode material active material Li 2 MnSiO 4 Slowly put into the zirconate source solution, the stirring speed is 50r / min, and the time is 0.5h to obtain the mixture. The mixture was gas-phase-dried and granulated under the condition of 350° C. to obtain a dispersed powder. The dispersed powder was heat-treated at 600°C for 10 hours at a heating rate of 15°C / min, and then naturally cooled to below 150°C, during which time oxygen was introduced. Fusion treatment after pulverization, rotating speed 700r / min, time 150 minutes, sieve, obtain the silicate cathode material Li 2 MnSiO 4 / ZrO 2 . After testing and analysis, the surface of the positive electrode material is covered with a layer of un...

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Abstract

The invention discloses a silicate anodal material for lithium ion batteries and a preparation method thereof to solve the technical problem of the enhancement of the material density of the silicate anodal material. The general formula of the anodal material is Li2MSiO4 / D, wherein the Li2MSiO4 is the active substance of the silicate anodal material, D is a modifying agent doped and covered on the surface of the Li2MSiO4. The preparation method comprises the following steps: preparing a modifying agent source solution; putting the Li2MSiO4 into the solution to obtain a mixture; and carrying out spraying, drying, hot processing and fusion processing on the mixture. Compared with the prior art, the invention utilizes a liquid-phase method to cover, modify and fuse the silicate anodal material so as to ensure that the silicate anodal material has the characteristics of high stacking density, high compacted density, high volume specific capacity, favorable processing performance of batteries and low cost. Batteries produced by the silicate anodal material have higher safety performance, magnification performance and cyclic performance.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery and a preparation method thereof, in particular to a silicate positive electrode material and a preparation method thereof. Background technique [0002] The increasingly prominent energy problems and the deteriorating environmental problems have prompted governments of various countries to continue to devote themselves to the development of new energy sources. Lithium-ion battery is one of the most promising new energy sources. It not only has the advantages of high energy density and long cycle life, but also is friendly to the environment. The source of power. Cathode materials that have been applied to power batteries, including layered transition metal oxide LiMO 2 , Olivine lithium iron phosphate LiFePO 4 and spinel lithium manganese oxide LiMn 2 o 4 . The above three materials have different defects: ① layered excessive metal oxide has poor overcharge resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/62H01M4/04H01M10/36
CPCY02E60/12Y02E60/10
Inventor 岳敏贺雪琴程林梁奇
Owner BTR NEW MATERIAL GRP CO LTD
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