Low-temperature type lithium ion secondary battery
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A secondary battery and lithium-ion technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve problems such as increased viscosity of organic electrolytes, difficulty in lithium ion migration, and failure of lithium-ion batteries to achieve broadened Range of use, large migration rate, effect of lowering melting point
Active Publication Date: 2015-03-11
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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[0004] But, because the negative electrode of the disclosed lithium ion secondary battery of above-mentioned patent all adopts graphite as electroactive material, because the lithium intercalation potential of graphite is about 0.1 volt, very close to the deposition potential 0 volt of lithium ion (relative to Li/Li + )
At low temperature, the viscosity of the organic electrolyte increases, the migration of lithium ions is difficult, and the polarization increases. If a lithium-ion battery with a lithium-ion graphite negative electrode system is charged at a low temperature
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Embodiment 1
[0048] A low-temperature lithium-ion secondary battery, the positive electrode contains 2 parts of Super P, 1 part of carbon nanotubes, 2 parts of polyvinylidene fluoride, 95 parts of spinel lithium manganate, and its thickness is 60 microns, of which manganese acid The median diameter of lithium is 7.2 microns. The negative electrode contains 4 parts of Super P, 1 part of carbon nanotube, 2 parts of polyvinylidene fluoride, and 93 parts of spinel lithium titanate. The thickness is 50 microns, and the median diameter of lithium titanate is 120 nanometers. LiPF with a solute concentration of 1.0mol / L in the electrolyte 6 , the solvent is 10% PC, 20% DMC, 65% DEC and 5% EA.
Embodiment 2
[0050] A low-temperature lithium-ion secondary battery, the positive electrode contains 2 parts of Super P, 2 parts of KS6, 3 parts of polyvinylidene fluoride, 93 parts of spinel lithium manganese oxide, and its thickness is 80 microns, wherein the lithium manganate The bit diameter is 8.3 microns. The negative electrode contains 4 parts of Super P, 2 parts of Vapor-grown carbon fiber (VGCF for short), 2 parts of polyvinylidene fluoride, and 92 parts of spinel lithium titanate, with a thickness of 65 microns, of which titanate The median diameter of lithium is 150 nm. LiPF with a solute concentration of 1.1mol / L in the electrolyte 6 , The solvent is 15% PC, 50% EMC, 15% DMC and 20% EA.
Embodiment 3
[0052] A low-temperature lithium-ion secondary battery, the positive electrode contains 3 parts of Super P, 2 parts of KS6, 4 parts of polyvinylidene fluoride, 91 parts of spinel lithium manganese oxide, and its thickness is 95 microns, wherein the lithium manganate The bit diameter is 9.1 microns. The negative electrode contains 6 parts of Super P, 1 part of VGCF, 3 parts of polyvinylidene fluoride, and 90 parts of spinel lithium titanate. The thickness is 75 microns, and the median diameter of lithium titanate is 200 nanometers. LiPF with a solute concentration of 1.0mol / L in the electrolyte 6 , the solvent is 60% DEC, 10% DMC, 25% EA and 5% PC.
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Abstract
The invention discloses a low-temperature type lithium ion secondary battery. The low-temperature type lithium ion secondary battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode is prepared from the following components including a positive electrode electroactive substance, a positive electrode conductive agent and a positive electrode adhesive; the positive electrode electroactive substance is spinel type lithium manganate, the positive electrode conductive agent is arbitrary more than two of superconductive carbon black, Super-P, KS-6, VGCF or a carbon nano tube, the positive electrode adhesive is polyvinylidene fluoride; the negative electrode is prepared from the following components including a negative electrode electroactive substance, a negative electrode conductive agent and a negative electrode adhesive; the negative electrode electroactive substance is spinel type lithium titanate, the negative electrode conductive agent is arbitrary one or more of the superconductive carbon black, the Super-P, the VGCF or the carbon nano tube, the negative electrode adhesive is the polyvinylidene fluoride; a solvent of the electrolyte is three or more of DMC, EMC, DEC, PC and EA but at least contains the PC and the EA, a solute of the solvent is lithium hexafluorophosphate, the melting point of the electrolyte is smaller than 40 DEG C below zero, and the viscosity is smaller than 3cP. The low temperature type lithium ion secondary battery can be safely charged under the low-temperature condition and is excellent in the charging and discharging cycle performance at low temperature.
Description
technical field [0001] The invention belongs to the technical field of low-temperature lithium-ion secondary batteries, and relates to a lithium-ion secondary battery, more specifically, to a lithium-ion secondary battery capable of being charged at low temperature and cyclically charged and discharged at low temperature. Background technique [0002] Since lithium-ion secondary batteries were commercialized in the early 1990s, with the continuous emergence of new materials and the gradual application of new technologies, lithium-ion secondary battery technology has made many progresses and its application fields have been further expanded. The main performance is that the energy density and power density are improved, the cycle life is increased, the safety performance is improved, and the low temperature -40°C or even low temperature -50°C has discharge capability. On the other hand, with the expansion of the field of human science and technology research and the change of...
Claims
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