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Lithium ion battery positive electrode slurry, positive electrode plate and lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., to achieve the effects of enhanced cycle stability, high utilization rate, and good thermal stability

Pending Publication Date: 2022-07-29
南通赛得能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is the problem of existing lithium ion batteries using iodine positive electrode materials, thereby providing a lithium ion battery positive electrode slurry, positive electrode sheet and lithium ion battery

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  • Lithium ion battery positive electrode slurry, positive electrode plate and lithium ion battery
  • Lithium ion battery positive electrode slurry, positive electrode plate and lithium ion battery

Examples

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Embodiment 1

[0038] This embodiment provides a positive electrode slurry for a lithium ion battery, and the specific preparation method is as follows.

[0039] (1) First prepare the carbon-iodine complex:

[0040] Disperse the activated carbon in deionized water, add iodine, then add NaOH solution to make the solution alkaline, stir at room temperature for 3 days, then add hydrochloric acid to make the solution pH 2, wash with water until the solution is neutral, and dry to obtain the carbon Iodine complex. The content of iodine in the carbon-iodine complex is 80 wt.%.

[0041] (2) Then prepare the positive electrode slurry of lithium ion battery:

[0042] Take 90g of carbon-iodine complex, 2g of Ketjen Black, 2g of dispersant CMC, add deionized water and stir at 2500rpm for 2 hours, then add 15g of binder SBR emulsion (SBR content is 40wt.%), stir at 300rpm for 30 minutes to obtain In the positive electrode slurry, the solid content of the slurry is 30 wt.%.

[0043] This embodiment a...

Embodiment 2

[0051] This embodiment provides a lithium-ion battery cathode slurry, and the specific preparation method is as follows:

[0052] (1) First prepare the carbon-iodine complex:

[0053] Disperse the activated carbon in deionized water, add iodine, then add NaOH solution to make the solution alkaline, stir at room temperature for 3 days, then add hydrochloric acid to make the solution pH 2, wash with water until the solution is neutral, and dry to obtain the carbon Iodine complex. The content of iodine in the carbon-iodine complex is 80 wt.%.

[0054] (2) Then prepare the positive electrode slurry of lithium ion battery:

[0055] Take 92g of carbon-iodine complex, 2g of Ketjen Black, 1g of dispersant CMC, add deionized water and stir at 2000rpm for 2 hours, then add 25g of acrylate copolymer aqueous solution (acrylate copolymer content 20wt.%), at 2000rpm The positive electrode slurry was obtained by stirring for 2 hours, and the solid content of the slurry was 35 wt.%.

[00...

Embodiment 3

[0064] This embodiment provides a lithium-ion battery cathode slurry, and the specific preparation method is as follows:

[0065] (1) First prepare the carbon-iodine complex:

[0066] Disperse the activated carbon in deionized water, add iodine, then add NaOH solution to make the solution alkaline, stir at room temperature for 3 days, then add hydrochloric acid to make the solution pH 2, wash with water until the solution is neutral, and dry to obtain the carbon Iodine complex. The content of iodine in the carbon-iodine complex is 80 wt.%.

[0067] (2) Then prepare the positive electrode slurry of lithium ion battery:

[0068] Take 92g of carbon-iodine complex, 1g of Ketjen black, 2g of polyacrylamide, add deionized water and stir at 3000rpm for 3 hours, then add 12.5g of binder SBR emulsion (SBR content 40wt.%), stir at 200rpm for 30 minutes to obtain In the positive electrode slurry, the solid content of the slurry is 35 wt.%.

[0069] This embodiment also provides a lit...

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Abstract

The invention discloses a lithium ion battery positive electrode slurry, which comprises the following raw materials in specific parts by mass: a carbon-iodine compound, a water-based dispersant, conductive carbon and a binder, and the carbon-iodine compound is a compound obtained by adsorbing elemental iodine with activated carbon. The invention also provides a preparation method of the positive electrode slurry, and a positive electrode plate and a lithium ion battery which are obtained by adopting the positive electrode slurry. According to the lithium ion battery positive electrode slurry provided by the invention, the carbon-iodine compound is adopted, the characteristic of low solubility of iodine in an aqueous solution is utilized, and the aqueous binder is adopted, so that the slurry preparation process is simple, the energy consumption is low, and the slurry is safe and environment-friendly. When the obtained positive electrode slurry is applied to the lithium ion battery, the finally obtained lithium ion battery has very high active substance utilization rate, and the prepared battery has the advantages of good rate and low-temperature performance; meanwhile, discharging is carried out before formation, an active iodine positive electrode material is converted into lithium iodide, and loss of active substances caused by contact of lithium iodide and water is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive electrode slurry, a positive electrode pole piece and a lithium ion battery. Background technique [0002] With the proposed carbon neutrality goal, the demand for energy storage or power battery products represented by lithium-ion batteries is increasing, and its application scenarios are becoming more and more extensive. While people pay attention to the energy density, cycle life, and safety of lithium-ion batteries, they also put forward higher requirements for their applications in special environments, such as high temperature, low temperature long-term storage or cycling, and high-power mobile electrical equipment. The development of high-power and low-temperature resistant lithium-ion batteries requires new materials and technological breakthroughs. [0003] The charge-discharge of lithium-iodine batteries is based on reversib...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M4/13H01M4/133H01M10/0525
CPCH01M4/362H01M4/388H01M4/583H01M4/621H01M4/625H01M4/133H01M4/13H01M10/0525H01M2004/028
Inventor 周行周浩朱文俊韩振
Owner 南通赛得能源有限公司
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