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A kind of high safety electrolyte and lithium ion battery

A lithium-ion battery, high-safety technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of reducing battery energy density, increasing battery volume, weight, etc., to improve battery safety, The effect of reducing reduction reactions and side reactions

Active Publication Date: 2021-10-08
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Whether it is a coating type or a blended material, it increases the volume and weight of the battery and reduces the energy density of the battery

Method used

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  • A kind of high safety electrolyte and lithium ion battery
  • A kind of high safety electrolyte and lithium ion battery
  • A kind of high safety electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A high-safety electrolyte, which includes 3% reagent I (n=4), 3:7 EC and EMC, 1.15M LiPF 6 , 2% VC and 1% lithium difluorophosphate.

[0042] A high-safety lithium-ion battery includes a positive pole, a negative pole, a diaphragm and the electrolyte.

[0043] The pre-charging temperature of the electrolyte is 10-100°C; the thickness of the SEI film after pre-charging is more than or equal to 40nm.

[0044] The preparation method of the described high-safety lithium-ion battery comprises the steps of:

[0045] (1) Positive electrode: Dissolve 95.5% nickel-cobalt lithium manganese oxide, 2.5% conductive agent and 2% polyvinylidene fluoride in N-methyl-2-pyrrolidone to make positive electrode slurry. Coat the slurry on aluminum foil, dry, roll, and die cut into 232*189mm;

[0046] (2) Negative electrode: Dissolve 95.5% graphite, 1% conductive agent, 1.5% CMC and 2% SBR in deionized water to make negative electrode slurry, coat the slurry on aluminum foil, dry, roll, mo...

Embodiment 2

[0051] A high-safety electrolyte, which includes 4% reagent I (n=10), 3:7 EC and EMC, 1.15M LiPF 6 , 2% VC and 1% lithium difluorophosphate.

[0052] A high-safety lithium-ion battery includes a positive pole, a negative pole, a diaphragm and the electrolyte.

[0053] The pre-charging temperature of the electrolyte is 10-100°C; the thickness of the SEI film after pre-charging is more than or equal to 40nm.

[0054] The preparation method of the described high-safety lithium-ion battery comprises the steps of:

[0055] (1) Positive electrode: Dissolve 95.5% nickel-cobalt lithium manganese oxide, 2.5% conductive agent and 2% polyvinylidene fluoride in N-methyl-2-pyrrolidone to make positive electrode slurry. Coat the slurry on aluminum foil, dry, roll, and die cut into 232*189mm;

[0056] (2) Negative electrode: Dissolve 95.5% graphite, 1% conductive agent, 1.5% CMC and 2% SBR in deionized water to make negative electrode slurry, coat the slurry on aluminum foil, dry, roll, m...

Embodiment 3

[0061] A high-safety electrolyte, which includes 3% reagent II (n=3), 3:7 EC and EMC, 1.15M LiPF 6 , 2% VC and 1% lithium difluorophosphate.

[0062] A high-safety lithium-ion battery includes a positive pole, a negative pole, a diaphragm and the electrolyte.

[0063] The pre-charging temperature of the electrolyte is 10-100°C; the thickness of the SEI film after pre-charging is more than or equal to 40nm.

[0064] The preparation method of the described high-safety lithium-ion battery comprises the steps of:

[0065] (1) Positive electrode: Dissolve 95.5% nickel-cobalt lithium manganese oxide, 2.5% conductive agent and 2% polyvinylidene fluoride in N-methyl-2-pyrrolidone to make positive electrode slurry. Coat the slurry on aluminum foil, dry, roll, and die cut into 232*189mm;

[0066] (2) Negative electrode: Dissolve 95.5% graphite, 1% conductive agent, 1.5% CMC and 2% SBR in deionized water to make negative electrode slurry, coat the slurry on aluminum foil, dry, roll, m...

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Abstract

The invention provides a high-safety electrolyte and a lithium-ion battery thereof. The high-safety electrolyte includes a film-forming agent; the film-forming agent is at least one of Additive I or Additive II. The electrolyte used in the lithium-ion battery of the present invention contains an inorganic film-forming agent and a long-chain organic film-forming agent. By controlling the molecular structure of the film-forming agent and matching a suitable pre-charging system, a graphite-thin inorganic SEI film is formed. ‑The method of loose and thick organic SEI film increases the electronic impedance of the negative electrode and improves the safety of the battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a high-safety electrolyte and lithium ion batteries. Background technique [0002] As the energy density of lithium-ion batteries increases, the thickness of the diaphragm becomes thinner and thinner, and the probability of internal short circuits caused by burrs increases significantly. At the same time, the thinning of the separator leads to the deterioration of the thermal stability of the separator, and the thermal shrinkage of the separator increases when the battery is heated, resulting in the risk of short circuit between the positive electrode and the negative electrode. [0003] In terms of mechanical abuse, lithium-ion batteries may encounter accidents such as punctures and extrusions during use, which may cause serious internal short circuits. [0004] The root cause of the internal short circuit fire is the contact between the aluminum foil and the negative elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 张越超秘军林董晶李硕硕高秀玲
Owner TIANJIN ENERGIES
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