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Silicate electrode material and preparation method thereof

A technology of silicate and carbon materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult breakthroughs in conductivity and lithium ion diffusion performance, and achieve excellent electrochemical activity, enhanced transport performance, The effect of simple preparation method

Active Publication Date: 2016-11-23
未名电池科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the silicate Li 2 MSiO 4 Cathode materials have outstanding advantages such as high specific capacity and high stability as a power battery, but it is still difficult to make breakthroughs in conductivity and lithium ion diffusion performance, which greatly limits the development of silicate Li 2 MSiO 4 Application of Cathode Materials

Method used

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  • Silicate electrode material and preparation method thereof
  • Silicate electrode material and preparation method thereof
  • Silicate electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] This example uses lithium hydroxide, ferric nitrate and tetraethyl orthosilicate to prepare silicate Li 2 FeSiO 4 , the highly conductive carbon material uses graphene, as follows:

[0039] The lithium hydroxide that takes by weighing 2.1g is dissolved in the deionized water of 50ml; The ferric nitrate Fe (NO 3 ) 3 , it was dissolved in 50ml of ethylene glycol, and 0.5g of ascorbic acid was added.

[0040] Lithium hydroxide aqueous solution, iron nitrate ethylene glycol solution and 2.8 g of tetraethyl orthosilicate were poured into a 150 ml reaction kettle, and reacted at 200° C. for 4 days to obtain a one-dimensional lithium ferrous silicate nanorod material.

[0041] Disperse the prepared one-dimensional lithium ferrous silicate nanorod material in an aqueous solution containing 1.0 g of PVP, add graphene, stir for 30 min, freeze-dry for 2 days, and then raise the temperature at a rate of 2 °C / min to 600°C for 10 hours to obtain a two-dimensional sandwich structu...

Embodiment 2

[0052] This example adopts lithium hydroxide, manganese nitrate and tetraethyl orthosilicate to prepare silicate Li 2 MnSiO 4 , the highly conductive carbon material uses nitrogen-doped graphene, as follows:

[0053] Weigh 2.6g of lithium hydroxide, dissolve it in 40ml of deionized water; weigh 3.8g of manganese nitrate, dissolve it in 60ml of ethylene glycol, and add 1.5g of ascorbic acid.

[0054] Lithium hydroxide aqueous solution, manganese nitrate ethylene glycol solution and 3.2 g of tetraethyl orthosilicate were poured into a 150 ml reaction kettle, and reacted at 180° C. for 8 days to obtain a one-dimensional lithium manganese silicate nanorod material.

[0055] Disperse the prepared one-dimensional lithium manganese silicate nanorod material in an aqueous solution containing 2.5 g of citric acid, add nitrogen-doped graphene, stir for 50 min, freeze-dry for 2 days, and then under nitrogen atmosphere, at 2 °C / min The temperature was raised to 650°C and kept for 7 hour...

Embodiment 3

[0065] This example adopts lithium hydroxide, cobalt nitrate and tetraethyl orthosilicate to prepare silicate Li 2 CoSiO 4 , the highly conductive carbon material uses graphene quantum dots, as follows:

[0066] Weigh 2.8g of lithium hydroxide, dissolve it in 50ml of deionized water; weigh 3.1g of cobalt nitrate, dissolve it in 50ml of ethylene glycol, and add 1.0g of ascorbic acid.

[0067] Lithium hydroxide aqueous solution, cobalt nitrate ethylene glycol solution and 3.8 g tetraethyl orthosilicate were poured into a 150 ml reaction kettle, and reacted at 210° C. for 6 days to obtain a one-dimensional cobalt lithium silicate nanorod material.

[0068] Disperse the prepared one-dimensional lithium cobalt silicate nanorod material in an aqueous solution containing 1.5 g of glucose, add graphene quantum dots, stir for 40 min, freeze-dry for 2 days, and then under nitrogen atmosphere, at a speed of 2 °C / min The temperature was raised to 650° C. and kept for 8 hours to obtain a...

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Abstract

The present invention discloses a silicate composite electrode material and a preparation method thereof. According to the silicate composite electrode material provided by the present invention, a silicate Li2MSiO4 material and a high-conductivity carbon material are connected through chemical bonding to form a high-activity composite electrode material, wherein M is Fe, Co, Mn or Ni. According to the silicate electrode material provided by the present invention, the lithium ion / electron transmission performance of the silicate electrode material is enhanced through a chemical bonding function, so that the silicate electrode material has excellent electrochemical activity when serving as a positive pole or negative pole of a lithium ion battery; meanwhile, use of a carbon material further enhances the conductivity of the silicate electrode material; and therefore, a foundation is laid for preparation of a lithium ion battery with high rate performance. The silicate electrode material provided by the present invention is simple in preparation method and low in production cost and therefore is very suitable for large-scale industrial production.

Description

technical field [0001] The present application relates to the field of lithium-ion battery electrode materials, in particular to a silicate composite electrode material and a preparation method thereof. Background technique [0002] The performance of lithium-ion batteries is mainly limited by the performance of the cathode material. At present, lithium cobalt oxide is a well-researched positive electrode material, but due to its poor safety, it is only used as a positive electrode material for conventional small and medium-capacity batteries, and cannot be used as a positive electrode material for large-capacity and high-power power batteries. The most promising cathode materials for power lithium-ion batteries are mainly spinel lithium manganese oxide LiMn 2 o 4 , layered nickel-cobalt-manganese ternary material Li(Ni,Co,Mn)O 2 , and polyanionic materials, mainly LiFePO 4 . However, the theoretical capacity of spinel lithium manganese oxide is low, only about 148mAh / g...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/133H01M4/1397H01M4/1393
CPCY02E60/10
Inventor 杨金龙潘锋
Owner 未名电池科技(深圳)有限公司
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