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A high-voltage high-energy-density lithium-ion battery
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A lithium-ion battery and high energy density technology, applied in the field of lithium-ion batteries, can solve the problems of shortened battery life, poor high-temperature performance, and mass production of the electrolyte, and achieve simple manufacturing process, chemical performance and safety performance Good, high energy density and high discharge platform effect
Inactive Publication Date: 2016-01-27
SHENZHEN WISEWOD TECH +1
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[0003] As the charging voltage increases, the side reactions between the electrodes and the electrolyte increase, which will adversely affect the cycle performance and high temperature performance of the battery, and the service life of the battery will be shortened; most of the current high-voltage lithium-ion batteries are designed for high-potential Spinel lithium manganese nickel oxide and its modified materials are used to design the process to make pole pieces, but the high temperature performance of this type of material is not good, and the matching electrolyte has not been mass-produced, which restricts the development of this material. large-scale industrial production
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Embodiment 1
[0048] Take the production process of a 1630mAh soft-pack lithium-ion battery model 495148AR as an example to illustrate. The production method of the battery is as follows:
[0049] 1. Preparation of positive electrode active materials
[0050] Will NH 4 h 2 PO 4 with LiNO 3 Mix and stir evenly according to the molar ratio of 1:3, add lithium cobaltate particles, and continuously stir to make Li 3 PO 4 Evenly coated on the surface of lithium cobalt oxide. The mass percentage of coating and lithium cobaltate is 1.0wt.%. After being dried, it is sintered at 400-700° C. for 1-5 hours to obtain a positive electrode active material of the modified lithium cobaltate. The particle size D50 of the modified lithium cobaltate is 10-14μm, and the specific surface area is 0.2-0.4㎡ / g.
[0051] 2. Preparation of positive electrode sheet
[0052] First, PVDF was fully dissolved in N-dimethylpyrrolidone (NMP) solvent to make a 4wt.% solution, and then modified lithium cobaltate and ...
Embodiment 2
[0060] Taking the manufacturing process of a 3100mAh aluminum case lithium-ion battery with a model number of 535672AR as an example to illustrate, the manufacturing method of the battery is implemented as follows:
[0061] 1. Preparation of positive electrode sheet
[0062] Wherein, the preparation of the positive electrode active material is the same as that of Example 1, and will not be repeated here.
[0063] First, PVDF was fully dissolved in N-dimethylpyrrolidone (NMP) solvent to make a 4wt.% solution, and then modified lithium cobaltate and super conductive carbon black (SUP-P) were added to it several times. The ratio is LiCoO 2 : SUP-P: PVDF=96:1.5:2.5, after 4-6 hours, stir at a high speed, then vacuum defoam for 0.5 hours, control the viscosity of the pulp at 3000-10000cP, and the solid content at 65%-75%. Finally, use an aluminum foil with a thickness of 16 μm as a current collector, and evenly coat the prepared slurry on both sides of the aluminum foil, reserve ...
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Abstract
The invention discloses a lithium-ion battery with high voltage and high energy density, which comprises a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte and a casing, the positive electrode sheet includes a positive electrode active material, a conductive agent, a binder and a current collector, the positive electrode active material, The mass percentages of the conductive agent and the binder are 92-97%: 2-3.5%: 1-6% respectively; The mass percentage of the agent is 90-96%: 1-5%: 4-10%; the lithium ion battery specifically uses modified lithium cobaltate LiCoO2 as the positive electrode active material, uses artificial graphite or natural graphite as the negative electrode material, and is equipped with It is made of corresponding ceramic diaphragm, high-voltage electrolyte, binder and conductive agent. The lithium-ion battery not only has high energy density and high discharge platform, but also has good chemical properties and safety performance, and is suitable for large-scale commercial process production.
Description
technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with high voltage and high energy density. Background technique [0002] At present, lithium-ion batteries, as a new generation of secondary batteries, have rapidly occupied the electronic product market by virtue of their high energy density, long cycle life, small self-discharge, no memory effect, and no environmental pollution, especially in mobile phones, computers, cameras , DVD, MP3 and other digital products. With the continuous improvement of people's consumption awareness, the requirements for the miniaturization, intelligence, and multi-function of various electronic products are getting higher and higher, and this requires high-capacity, high-energy-density lithium-ion batteries as rigid support conditions. Increasing the charging and discharging voltage range of the battery can effectively increase the energy density of the battery...
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