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A kind of polymer composite binder and its application and lithium-ion battery negative electrode material prepared based on it and preparation method

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limiting the practical application of silicon materials, poor electrode cycle stability, decreased cycle specific capacity, etc., and achieve cycle stability performance. Good, low equipment requirements, long battery life effect

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the condition of highly deintercalated lithium, silicon materials have a serious volume effect, which can easily lead to the collapse of structural materials, resulting in poor cycle stability of the electrode, easy pulverization and peeling, and serious damage to the electrode structure, resulting in The rapid decline in its cycle specific capacity limits the practical application of silicon materials in lithium-ion batteries

Method used

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  • A kind of polymer composite binder and its application and lithium-ion battery negative electrode material prepared based on it and preparation method
  • A kind of polymer composite binder and its application and lithium-ion battery negative electrode material prepared based on it and preparation method
  • A kind of polymer composite binder and its application and lithium-ion battery negative electrode material prepared based on it and preparation method

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preparation example Construction

[0037] The preparation method of silicon negative pole material of lithium ion battery comprises the following steps:

[0038] Step 1: configuring the linear polymer and sheet polymer composite into a 0.5-2wt% aqueous solution;

[0039] Step 2: Put the active material and conductive agent in a mortar and grind for 5-10 minutes;

[0040] Step 3: Add the composite binder prepared in step 1 dropwise to the mixture in step 2, and grind until the binder is evenly mixed with the active material and the conductive agent;

[0041] Step 4: Add deionized water dropwise to the colloidal mixture with a certain viscosity obtained in step 3, and then fully grind for 20-30 minutes;

[0042] Step 5: Pour the mixture obtained in Step 4 onto the Cu sheet and spread evenly;

[0043] Step 6: The copper sheet obtained in step 5 is rapidly blown and dried to remove solvent water to obtain a pole piece, and the pole piece is vacuum-dried;

[0044] Step 7: After weighing the vacuum-dried electrode...

Embodiment 1

[0047] Firstly, guar gum (GG) and fulvic acid complex (GG / HA) were configured into a 0.5wt% aqueous solution, wherein the mass ratio of guar gum and fulvic acid was 4:1. Weigh 60.0 mg of nano-Si and 30.0 mg of acetylene black and place them in a mortar, grind for 10 minutes, and then dropwise add 2.0 g of 0.5 wt % guar gum and fulvic acid complex aqueous solution. Grind for 5 minutes until the binder is evenly mixed with silicon powder and carbon powder, then add 1mL of deionized water dropwise, and then grind thoroughly for 15-10 minutes. Place the pasty mixture on a Cu sheet, spread it evenly with a 100 μm spatula, quickly place it in a blast drying oven at 60° C., and take it out after five minutes. Then put the electrode piece into a vacuum drying oven, and vacuum dry at a constant temperature of 80° C. for 6 hours. After weighing the vacuum-dried electrode pieces, assemble them in the glove box in the 2032 battery case, use the lithium sheet as the positive electrode, us...

Embodiment 2

[0049] Firstly, the xanthan gum and fulvic acid complex (XG / HA) were formulated into a 2.0 wt% aqueous solution, wherein the mass ratio of xanthan gum and fulvic acid was 6:1. Weigh 70.0 mg of nano-Si and 10.0 mg of acetylene black in a mortar, grind for 10 minutes, and then add 1.0 g of 2.0 wt % xanthan gum and fulvic acid complex aqueous solution dropwise. Grind for 5 minutes until the binder is evenly mixed with Si powder and carbon powder, then add 1mL of deionized water dropwise, and then fully grind for 15-10 minutes. Place the pasty mixture on a Cu sheet, spread it evenly with a 100 μm spatula, quickly place it in a blast drying oven at 60° C., and take it out after five minutes. Then put the electrode piece into a vacuum drying oven, and vacuum dry at a constant temperature of 80° C. for 6 hours. After weighing the vacuum-dried electrode pieces, assemble them in the glove box in the 2032 battery case, use the lithium sheet as the positive electrode, use the polyethyle...

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Abstract

The invention discloses a polymer composite adhesive, an application thereof, a lithium ion battery anode material prepared based on the polymer composite adhesive and a preparation method, and belongs to the technical field of electrochemistry and new energy materials. The adhesive is dissolved in a dispersion medium to form a solution with concentration of 0.5%-2.0%, wherein the dispersion medium is deionized water, and the mass ratio of a linear polymer to a lamellar polymer is (6-16): (1-4). The lithium ion battery anode slurry using the composite adhesive is prepared from an active material, a conductive agent and the adhesive in a mass ratio of (50-80): (10-30): (10-20). The adhesive is composited from the linear polymer and the lamellar polymer, the polymer composite adhesive can construct a cross-linked three-dimensional network structure around silicon particles, the silicon particles are effectively prevented from irreversible slippage, volume change is buffered, and electrical connection and integrity of electrodes are maintained. The composite adhesive adopts widely sourced raw materials and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and new energy materials, and in particular relates to a polymer composite adhesive and its application, and a lithium ion battery negative electrode material prepared based on the same and a preparation method. Background technique [0002] As the anode material of lithium-ion batteries, silicon has a theoretical specific capacity as high as 4200mAh / g, which has important research and application value. However, under the condition of highly deintercalated lithium, silicon materials have a serious volume effect, which can easily lead to the collapse of structural materials, resulting in poor cycle stability of the electrode, easy pulverization and peeling, and serious damage to the electrode structure, resulting in The rapid decline in its cycle specific capacity limits the practical application of silicon materials in lithium-ion batteries. [0003] To solve this problem, the binder be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/36H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 宋洁柯如媛牛育华阮欢费贵强
Owner SHAANXI UNIV OF SCI & TECH
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