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High-energy lithium-battery anode pulp and preparation method thereof

A negative electrode slurry and lithium battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrode material powdering and falling off, high crystallinity, and high brittleness, and achieve low swelling rate, high content, and maintenance good form effect

Active Publication Date: 2018-10-23
辽宁九夷锂能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF has no functional straight chain structure, and can only be combined with the negative electrode material by van der Waals force. It has high crystallinity and poor shape retention. It cannot provide sufficient bonding force for silicon-based materials with severe volume changes, resulting in electrode materials that are easy to change from The current collector is pulverized and falls off, so the battery cycle performance is unstable and the capacity decays rapidly; the chemical bonding force between CMC and Si surface makes CMC / SBR have better stability for nano-Si / C electrodes, but CMC is generally viscous and brittle , Poor flexibility, the pole piece is easy to crack when charging and discharging

Method used

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  • High-energy lithium-battery anode pulp and preparation method thereof
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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 A kind of high-energy lithium battery negative electrode slurry

[0024] (1) The formula quantity is: 100 parts of silicon carbon active material (coated with silica graphite, silicon content 15%), 2 parts of conductive agent (carbon black), 7 parts of sodium alginate, crosslinking agent (containing Ca 2+ aqueous solution) 5 parts, buffer solution 15 parts, deionized water 15 parts; the buffer solution has a pH value of 3.

[0025] (2) Preparation method:

[0026] 1) Add 7 parts of sodium alginate to 15 parts of buffer solution and stir for 1 hour to obtain mixture A.

[0027] 2) Dissolve 5 parts of cross-linking agent into 15 parts of deionized water to obtain solution B.

[0028] 3) Take 100 parts of silicon carbon active material and 2 parts of conductive agent and dry mix for 30 minutes, add 70% mixture A, stir for 45 minutes, add the remaining mixture A, stir for 2 hours, add solution B and stir for 1 hour, add water to adjust the viscosity , to obt...

Embodiment 2

[0030] Embodiment 2 A kind of high-energy lithium battery negative electrode slurry

[0031] (1) The formula quantity is: 100 parts of silicon carbon active material (coated with silica graphite, silicon content 15%), 0.5 part of conductive agent (carbon black), 2 parts of sodium alginate, crosslinking agent (containing Sr 2+ aqueous solution) 3 parts, buffer solution 15 parts, deionized water 15 parts; the buffer solution has a pH value of 2.

[0032] (2) Preparation method:

[0033] 1) Add 2 parts of sodium alginate to 7 parts of buffer solution and stir for 1 hour to obtain mixture A.

[0034] 2) Dissolve 3 parts of cross-linking agent into 10 parts of deionized water to obtain solution B.

[0035] 3) Take 100 parts of silicon carbon active material and 0.5 part of conductive agent and dry mix for 30 minutes, add 70% of mixture A, stir for 45 minutes, add the remaining mixture A, stir for 2 hours, add solution B and stir for 1 hour, add water to adjust the viscosity , to...

Embodiment 3

[0036] Embodiment 3 A kind of high-energy lithium battery negative electrode slurry

[0037] (1) The formula quantity is: 100 parts of silicon carbon active material (coated with silica graphite, silicon content 15%), 5 parts of conductive agent (carbon nanotube), 10 parts of sodium alginate, crosslinking agent (containing Ca 2+ aqueous solution) 8 parts, buffer solution 25 parts, deionized water 20 parts; the buffer solution has a pH value of 4.

[0038] (2) Preparation method:

[0039] 1) Add 10 parts of sodium alginate to 25 parts of buffer solution and stir for 1 hour to obtain mixture A.

[0040] 2) Dissolve 8 parts of cross-linking agent into 20 parts of deionized water to obtain solution B.

[0041]3) Take 100 parts of silicon carbon active material and 5 parts of conductive agent and dry mix for 30 minutes, add 70% mixture A, stir for 45 minutes, add the remaining mixture A, stir for 2 hours, add solution B and stir for 1 hour, add water to adjust the viscosity , to...

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Abstract

The invention discloses high-energy lithium-battery anode pulp and a preparation method thereof. The high-energy lithium-battery anode pulp is prepared from the following components in parts by weight: 40-100 parts of silicon-carbon active substance, 0.5-10 parts of conducting agent, 1-10 parts of binding agent, 0.1-5 parts of crosslinking agent, 5-25 parts of buffer solution and 5-25 parts of deionized water, wherein the binding agent is sodium alginate, the crosslinking agent is aqueous solution containing divalent metal cations and the pH value of the buffer solution is 2-5. The high-energylithium-battery anode pulp disclosed by the invention has the beneficial effect that the problems of pulverization and energy attenuation of the silicon-carbon anode material due to volume change inthe circulation process of charging and discharging are effectively improved. In addition, the high-energy lithium-battery anode pulp has the advantages of simple preparation method, low production cost, environment-friendly effect and continuous production and the like, and has the possibility of industrial production.

Description

technical field [0001] The invention relates to the technical field of high-energy lithium batteries, in particular to a high-energy lithium battery negative electrode slurry and a preparation method thereof. Background technique [0002] With the advantages of high energy density, high working voltage, low self-discharge rate, long service life, no memory effect, environmental friendliness, and high safety, lithium-ion batteries have been widely used in power supplies and grid energy storage systems. In recent years, in the face of higher requirements in the aerospace industry, high-end military equipment, long-range electric vehicles, portable electronic products and other application fields, high-performance and low-cost lithium-ion batteries have become a research and development hotspot. High specific capacity positive and negative electrode materials are the key factors to improve the energy density of lithium-ion batteries. [0003] Carbon-based anode materials for t...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 李晓峰
Owner 辽宁九夷锂能股份有限公司
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