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Metal conductive agent and lithium ion battery using conductive agent

A lithium-ion battery, metal conductive technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve problems such as insufficient battery performance, improve practicality, and large irreversible capacity loss, and achieve maintenance cycle life, The effect of maintaining conductivity and suppressing dislocation and peeling

Inactive Publication Date: 2016-01-13
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method: when the proportion of oxygen is high, the volume change can be effectively reduced, but the irreversible capacity loss is large due to excessive reduction and decomposition reactions; the volume change cannot be suppressed when the proportion of oxygen is low
Disadvantages of this method: the ultrafine materials are violently agglomerated during the cycle, which is not enough to improve the performance of the battery to be practical

Method used

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  • Metal conductive agent and lithium ion battery using conductive agent
  • Metal conductive agent and lithium ion battery using conductive agent
  • Metal conductive agent and lithium ion battery using conductive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of negative electrode: Dissolve 0.035kg of CMC in deionized water to make glue. 0.23kg of spring-like copper (D50=1.0um) and 0.012kg of CNT were made into dispersions respectively. Stir CMC glue, copper powder dispersion, CNT dispersion, 2.00kg of silicon oxide / graphite composite material, SBR glue (SBR solid mass 0.035kg), and appropriate amount of deionized water 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. During rolling, the porosity of the negative electrode is controlled at 23.0%±0.5%.

[0048] Preparation of positive electrode: Dissolve 0.062g PVDF in NMP to make glue. Stir PVDF glue, 4.00kg lithium cobaltate, 0.062kg SP, and an appropriate amount of NMP evenly to make positive electrode slurry. Coat the slurry on an aluminum foil, dry, roll, cut into a size of 51.5×548mm, and weld an aluminum tab at one end.

[0049]Electrolyte preparation: Mix EC,...

Embodiment 2

[0052] Preparation of negative electrode: Dissolve 0.039kg of CMC in deionized water to make glue. 0.50kg of spring-like copper (D50=1.0um) and 0.012kg of CNT were respectively made into dispersion liquids. Stir CMC glue, copper powder dispersion, CNT dispersion, 2.00kg silicon oxide / graphite composite material, SBR glue (SBR solid mass 0.039kg), and appropriate amount of deionized water to make negative electrode slurry. Coat the slurry on a non-woven fabric separator, dry, roll, cut into a size of 53×550 cm, and stick a nickel tab on one end. During rolling, the porosity of the negative electrode is controlled at 23.0%±0.5%.

[0053] The positive electrode, electrolyte, and battery manufacturing process are the same as in Example 1.

Embodiment 3

[0055] Preparation of negative electrode: Dissolve 0.035kg of CMC in deionized water to make glue. 0.25kg of spring-like copper (D50=1.0um) was made into a dispersion. Stir the CMC glue, copper powder dispersion, 2.00kg of silicon oxide / graphite composite material, SBR glue (SBR solid mass 0.039kg), and appropriate amount of deionized water to make negative electrode slurry. Coat the slurry on the copper foil, dry it, roll it, cut it into a size of 53×550cm, and stick a nickel tab on one end. During rolling, the porosity of the negative electrode is controlled at 23.0%±0.5%.

[0056] The positive electrode, electrolyte, and battery manufacturing process are the same as in Example 1.

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Abstract

The invention relates to a metal conductive agent and a lithium ion battery using the conductive agent. The metal conductive agent is made of metal which has stable properties under a negative pole potential, such as silver, copper, nickel, stainless steel, nickel-plated silver or nickel-plated copper; and the metal conductive agent has a powder shape or spring shape or hollow semispherical shape or other hollow shapes. In a negative pole, the hollow metal conductive agent is used; by controlling the compaction density of a pole piece, the conductive agent keeps a certain hollow structure after being ground; when a silicon-containing negative pole is charged and expanded, the metal conductive agent is deformed along the expansion direction of negative pole particles to form a certain space, so that the staggering and stripping of the negative pole particles are inhibited to a certain extent; and meanwhile, the contact area of metal and the negative pole particles keeps unchanged or is relatively large when the negative pole particles are extruded and enough conductivity is kept, so that the cycling service life is maintained.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a metal conductive agent applied to lithium ion batteries and a battery using the conductive agent. Background technique [0002] A variety of alloy phases can be obtained by the reaction of lithium and silicon, so that silicon has a high theoretical capacity (4200mAh / g) and a certain cycle performance, and can be used as an ideal lithium-ion battery negative electrode material. However, the alloy formed by silicon and lithium will cause a volume expansion of 300% during the charge and discharge process, resulting in the pulverization and peeling of the active material, resulting in a rapid decline in capacity. [0003] For silicon materials, there are currently two main ways to solve the problem of volume expansion: [0004] One is to use oxides as precursors. During the charging and discharging process, the oxides first undergo reduction and decomposition reactions to form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M4/13
CPCH01M4/13H01M4/624H01M4/626H01M10/0525Y02E60/10
Inventor 张越超张敏李兴旺高秀玲王立仕王驰伟
Owner TIANJIN ENERGIES
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