Negative electrode composite material of lithium ion battery and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the field of lithium-ion battery negative electrode composite materials and its preparation, can solve problems such as poor cycle stability, electrode powdering, and damage to the coating layer, and achieve powdering prevention, simple process, and improved The effect of cycle stability

Active Publication Date: 2018-01-23
SUZHOU GINET NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution has the following disadvantages: elemental silicon and silicon oxide are simply mixed physically, and the final particles are all in the micron size, and then mixed with graphite and then coated with amorphous carbon
Due to the large particles of the material itself, the volume expansion during charging and discharging will destroy the previous coating layer, resulting in electrode pulverization and poor cycle stability.

Method used

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  • Negative electrode composite material of lithium ion battery and preparation method thereof
  • Negative electrode composite material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) Add 500g of methyltrimethoxysilane to a 20Kg aqueous solution containing 20g of HEC, 80g of PVA and 50g of DISPEBYK-2012, stir and react for 10min, add 1Kg (D50 is 50-100nm) nano silicon powder, stir for 30min, and control the temperature at 60 ℃. Nitric acid was added dropwise, the pH was controlled at 3 to 4, and the reaction was allowed to stand at room temperature (25°C) for 2 hours to obtain the intermediate (Si / SiO x ), D50=800nm.

[0051] (2) 1Kg of graphite with D50=10um was added to the suspension system and stirred for 1 hour, then spray-dried. The inlet temperature of the spray dryer was set at 300°C, and the outlet temperature was set at 120°C to obtain spherical materials.

[0052] (3) Redox reaction and carbonization treatment are carried out on the above-mentioned spherical material in a carbonization furnace under an argon atmosphere, the temperature is set at 1200° C., and the temperature is kept for 4 hours.

Embodiment 2

[0054] (1) Add 400g of methyltrimethoxysilane to a 20Kg aqueous solution containing 10g of HEC, 40g of PVA and 30g of DISPEBYK-2012, stir and react for 10min, add 1Kg (D50 is 50-100nm) nano silicon powder, stir for 30min, and control the temperature at 60 ℃. Nitric acid was added dropwise, the pH was controlled at 3 to 4, and the reaction was allowed to stand at room temperature (25°C) for 2 hours to obtain the intermediate (Si / SiO x ), D50=600nm.

[0055] (2) 1Kg D50=10um graphite was added to the suspension system and stirred for 1 hour, then spray-dried. The inlet temperature of the spray dryer was set at 280°C, and the outlet temperature was set at 110°C to obtain spherical materials.

[0056] (3) Redox reaction and carbonization treatment are carried out on the above-mentioned spherical material in a carbonization furnace under an argon atmosphere, the temperature is set at 1200° C., and the temperature is kept for 4 hours.

Embodiment 3

[0058] (1) Add 600g of methyltrimethoxysilane to a 20Kg aqueous solution containing 20g of HEC, 80g of PVA and 30g of DISPEBYK-2012, stir and react for 10min, add 1Kg (D50 is 50-100nm) nano silicon powder, stir for 30min, and control the temperature at 60 ℃. Nitric acid was added dropwise, the pH was controlled at 3 to 4, and the reaction was allowed to stand at room temperature (25°C) for 2 hours to obtain the intermediate (Si / SiO x ), D50=1um.

[0059] (2) 900g of graphite with D50=1um was added to the suspension system and stirred for 1h, then spray-dried, the inlet temperature of the spray dryer was set at 280°C, and the outlet temperature was set at 100°C to obtain spherical materials.

[0060] (3) Redox reaction and carbonization treatment are carried out on the above-mentioned spherical material in a carbonization furnace under an argon atmosphere, the temperature is set at 1000° C., and the temperature is kept for 8 hours to obtain the product.

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Abstract

The invention relates to a negative electrode composite material of a lithium ion battery. The material comprises a core body, an intermediate layer that is coated outside the core body and has pores,and an outer layer coated outside the intermediate layer, wherein the core body is nano silicon, the intermediate layer is silicon monoxide compounded with graphite, and the outer layer is amorphouscarbon. According to the scheme of the invention, a negative electrode composite material with a novel structure is obtained through the improvement of a preparation method, the negative electrode composite material can control the volume expansion of silicon in a certain space, effectively prevent silicon electrodes from being pulverized, and improve the cycling stability, and can be used as a negative electrode material of a high-capacity lithium battery. The preparation method has a simple process and is suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode composite material and a preparation method thereof. Background technique [0002] As an important part of lithium-ion batteries, negative electrode materials have a variety of research objects, which can be summarized into two categories: the first category is carbon materials, including graphitized carbon materials and amorphous carbon materials; the second category is non-carbon materials. Materials mainly include silicon-based materials, tin-based materials, transition metal oxides, metal nitrides and other alloy anode materials. [0003] An ideal lithium-ion battery anode material should meet the following requirements: [0004] 1. It should have a lower oxidation-reduction potential to ensure a higher output voltage for lithium-ion batteries; [0005] 2. It can allow a large number of lithium ions to be reversibly intercalated and extracted, and has a high energy density; [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 沈晓燕陈林黄勇峰刘利人
Owner SUZHOU GINET NEW MATERIAL TECH CO LTD
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