Flexible package lithium ion battery silicon negative pole and manufacturing method thereof
A lithium-ion battery, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of short battery cycle life, and achieve the effect of improving cycle stability and initial charge-discharge efficiency.
Active Publication Date: 2015-01-14
WANXIANG 123 CO LTD
9 Cites 21 Cited by
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The invention relates to a flexible package lithium ion battery silicon negative pole. The flexible package lithium ion battery silicon negative pole consists of a current collector and an active substance layer coating the surface of the current collector, wherein the active substance layer consists of the following substances in percentage by mass: 10-92 percent of silicon-carbon composite material, 2-70 percent of a conductive agent and 5-20 percent of an adhesive; the adhesive refers to polyimide; the porosity of the active substance layer is 30-65 percent, and the compaction density is 1.1-2.0g/cm<3>. Polyimide is dispersed by adopting a proper solvent, and the adhesive subjected to high-temperature polyacylation treatment has extremely high adhesive force, so that the prepared silicon negative pole piece has ultra-strong tension stress, the structure is kept stable in the repeated lithium-ion embedding and separating process, the first charge-discharge efficiency of the silicon negative pole can be obviously improved, and the cycling stability is improved.
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Property | Measurement | Unit |
Compaction density | 1.1 ~ 2.0 | g/cm³ |
Thickness | 8.0 ~ 25.0 | µm |
Compaction density | 0.0 ~ 2.0 | g/cm³ |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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