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Lithium ion battery

A lithium-ion battery and particle technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased oxidation activity of positive electrode materials, rapid consumption of electrolyte, and reduced battery safety, etc., to improve cycle performance, inhibit The occurrence of side reactions, the effect of preventing consumption and loss of capacity

Active Publication Date: 2019-10-22
NINGDE AMPEREX TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the working voltage of commercial lithium-ion batteries is low. If the battery is under high voltage, the oxidation activity of the positive electrode material will increase and the structure will be easily destroyed. At the same time, the electrolyte is also prone to decomposition under high voltage, especially in the The electrochemical oxidation reaction occurs on the surface of the positive electrode, which leads to an increase in the impedance of the positive electrode, rapid consumption of the electrolyte, flatulence, deterioration of battery cycle performance, and also reduces the safety of the battery.

Method used

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Examples

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Effect test

Embodiment 1

[0066] 1. Preparation of positive electrode sheet

[0067] Stir the positive electrode material, conductive agent Super P, and binder polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) solvent to make positive electrode slurry, in which the particles containing lithium compounds in the positive electrode material are LiCoO 2 , the element contained in the inorganic compound is Zr, and based on the total mass of the positive electrode material, the mass percentage of Zr is 0.5%. The solid content in the positive electrode slurry was 77wt%, and the mass ratio of the positive electrode material, conductive agent Super P and PVDF in the solid component was 97.8:1:1.2. The positive electrode slurry is evenly coated on the current collector aluminum foil with 90% of the negative electrode capacity; after drying at 85°C, it is cold-pressed; then trimmed, cut into pieces, and divided into strips, and baked under vacuum conditions at 85°C Dry for 4 hours to make a lithium-ion...

Embodiment 2～6、31～32

[0076] The preparation method is consistent with that of Example 1, except that the inorganic compound contains the types and contents of elements, and the changes of the types and contents refer to Table 1.

Embodiment 7～10、33～34

[0078] The preparation method is consistent with that of Example 1, except that the content of organic matter 31 changes, and its content changes refer to Table 1. Examples 11-13, 35-36

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Abstract

The present invention provides a lithium ion battery. The lithium ion battery comprises: a cathode comprising a cathode material, wherein the cathode material comprise particles containing a lithium compound and inorganic compounds arranged at the surfaces of the particles; an anode; an isolating membrane; and an electrolyte comprising ethylene sulfate and nitrile compound. Through combination andcooperative effect of the cathode material and the electrolyte, under a high voltage, the damaging of the cathode material structure and the oxygenolysis of the electrolyte can be effectively inhibited, and the cycle performance and the safety performance of the lithium ion battery can be obviously improved in the high voltage.

Description

technical field [0001] The present application relates to the field of energy technology, in particular, to lithium-ion batteries. Background technique [0002] With technological advancements and market developments in smartphones, drones, and electric vehicles, demands on battery performance are increasing. Lithium-ion batteries have become the mainstream batteries used in the above fields due to their advantages such as high energy density, long cycle life, and no memory effect. At present, improving energy density and safety performance are the two main research directions of high-performance lithium-ion batteries. Improving the operating voltage and using new materials with high energy density are effective ways to increase the energy density of lithium-ion batteries. Although new high-energy-density lithium-ion battery materials have been widely studied, they are still in the basic research stage, and increasing the working voltage is still an important way to increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M4/505H01M4/525H01M4/628H01M2004/028Y02E60/10
Inventor 马娟唐超刘俊飞薄祥昆
Owner NINGDE AMPEREX TECH
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