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Modified CMC and gel battery thereof

A gel battery and modification technology, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of lower hardness of the battery core, decreased electrical performance, and non-bonding, etc., and achieves simple manufacturing process, Good affinity and excellent battery performance

Active Publication Date: 2015-05-06
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This has caused the following hidden dangers: (1) The separator and the negative electrode are not bonded, and it is easier to accumulate the gas generated by charging and discharging, resulting in a decrease in electrical performance; (2) The separator and the negative electrode are not bonded, and the electrolyte is easily separated between the separator and the negative electrode. Uneven distribution, resulting in a decrease in electrical performance; (3) The hardness of the battery core becomes lower, and the consistency of hardness between batches decreases

Method used

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  • Modified CMC and gel battery thereof
  • Modified CMC and gel battery thereof
  • Modified CMC and gel battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1—1

[0050] Preparation of positive electrode: Dissolve 0.041g of PVDF in NMP to make glue; mix 2.00kg of lithium cobaltate, 0.031kg of carbon black conductive agent, prepared PVDF glue, and appropriate amount of NMP (about 1kg) to make positive electrode slurry . Coat the slurry on an aluminum foil, dry, roll, cut into a size of 51×551mm, and weld an aluminum tab at one end.

[0051]Preparation of negative electrode: 0.016kg CMC1 was dissolved in deionized water to make glue, 1.00kg graphite, 0.010kg carbon black conductive agent, prepared CMC1 glue, SBR (solid mass 0.016kg), appropriate amount of deionized water ( 0.3kg or so) and stirred evenly to make negative electrode slurry. Coat the slurry on the copper foil, dry, roll, cut into a size of 53×550cm, and weld a nickel tab at one end.

[0052] Electrolyte preparation: Mix EC, PC, and EMC at a volume ratio of 35:5:60, and add LiPF at a lithium salt concentration of 1.0M 6 , respectively adding 1% mass fraction of VC and 1% m...

Embodiment 1-2

[0054] Example 1-2: The positive electrode, negative electrode, electrolyte, and battery manufacturing process are the same as in Example 1-1. Variable: hot pressing temperature 70°C.

Embodiment 1-3

[0055] Embodiment 1-3: The positive electrode, negative electrode, electrolyte solution, and battery manufacturing process are the same as in Embodiment 1-1. Variable: hot pressing temperature 80°C.

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Abstract

The invention relates to a modified CMC and a gel battery. The modified CMC is used for improving the bonding strength of a negative electrode and a diaphragm of the aqueous gel battery. The gel battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte. In the preparation of the negative electrode, a used binder is a combination of the modified CMC and SBR, and a solvent is deionized water. The gel battery technology is applied to an aqueous battery, the advantages of the gel battery and the aqueous battery are combined, and the research and the practical significances are important. The modified CMC provided by the invention has good affinity with a P(VDF-HFP) coating of the diaphragm, the aqueous negative electrode can strongly bonded to the diaphragm by hot and cold pressing, the production process is simple, and the battery performance is excellent.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a modified CMC and a gel battery thereof. Background technique [0002] Advantages of water-based negative electrode batteries: (1) Using water as a solvent has low cost and little pollution. (2) The resistance of water-based negative electrode binders (CMC and SBR) is greater than that of oil-based binders (PVDF). Negative higher safety performance. [0003] The advantages of the gel battery: (1) The gel battery sticks the pole piece and the diaphragm together, so that the interface between the pole piece and the diaphragm is tighter and more uniform, and the lithium ion transmission path is smoother; the electrolyte is distributed very evenly, and the electrolysis The consumption of liquid in different areas of the battery is also more even, so the electrical performance, especially the consistency of cycle performance, is excellent. (2) Due to the good liquid retention performance o...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/058H01M10/0565
CPCH01M4/622H01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 张越超曹建坤高秀玲王立仕
Owner TIANJIN ENERGIES