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High-capacity lithium-ion electrolyte, battery and preparation method of battery

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of unstable structure of high-Ni materials, reduced cycle performance, safety hazards, etc., and improve the charging and discharging efficiency. , Improve the storage time, inhibit the effect of decomposition

Active Publication Date: 2010-07-07
JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cathode materials with high Ni content have become the most promising cathode materials for lithium-ion batteries due to their advantages of abundant resources, low price, non-toxicity, high specific capacity, and fast high-voltage charging and discharging. However, the structure of high-Ni materials is unstable and easily leads to structural deformation. , reduce the cycle performance, especially when stored under high temperature conditions, the capacity decay is more serious, and a large amount of gas is generated, which brings great safety hazards

Method used

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  • High-capacity lithium-ion electrolyte, battery and preparation method of battery
  • High-capacity lithium-ion electrolyte, battery and preparation method of battery
  • High-capacity lithium-ion electrolyte, battery and preparation method of battery

Examples

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Embodiment 1

[0026] The present invention will be further described in detail below with reference to the examples and drawings, but the implementation of the present invention is not limited thereto.

[0027]The battery of the electrolyte of the present invention comprises a positive pole, a negative pole, a diaphragm, an aluminum-plastic composite film packaging bag, positive and negative pole ears, and an electrolyte; wherein the positive pole of the battery is 93% to 96% of the positive active material, 1% to 3% Conductive agent, 2% to 4% binder; the negative electrode of the battery is 94% to 97% of negative electrode active material, 0% to 2% conductive agent, 2% to 4% binder; wherein the positive electrode active material is selected from LiNi x co 1-x o 2 、LiNi x mn y co 1-x-y o 2 One or several amorphous mixtures or / with LiCoO 2 Combination in any ratio, where x≥0.5, where LiNi x co 1-x o 2 x is preferably 0.8 to 0.7, where LiNi x mn y co 1-x-y o 2 In x≥0.5, y≤0.3, th...

Embodiment 1～5

[0034] The preparation method is the same as that of Comparative Example 1, except that the preparation of the positive electrode has the following changes:

[0035]

[0036] The prepared battery was also tested for its capacity and cycle performance according to "GB / T18287-2000 General Specification for Lithium-ion Batteries for Cellular Phones".

Embodiment 6

[0040] LiBF4 and LiPF as lithium salts 6 Soluble in ethylene carbonate (EC) / propylene carbonate (PC) / ethyl methyl carbonate (EMC) / diethyl carbonate (DEC) / ethyl butyrate (EB) (mass ratio 20 / 10 / 10 / 40 Obtain solution in the mixed solvent of / 20), wherein the concentration of LiBF4 is 0.2M, LiPF 6 The concentration is 1M. Then in this solution, add vinylene carbonate (VC) by 1% of the total weight of the electrolyte, add ethylene carbonate (VEC) by 0.5% of the total weight of the electrolyte, add 1 by 5% of the total weight of the electrolyte, For 3-propiolactone sulfonate (1,3-PS), ethanolamine is added at 0.1% of the total weight of the electrolyte, and biphenyl is added at 5% of the total weight of the electrolyte to obtain the electrolyte. Add the electrolyte solution into the battery of Example 1 and test its capacity and cycle performance according to "GB / T18287-2000 General Specification for Lithium-ion Batteries for Cellular Phones".

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Abstract

The invention relates to a high-capacity lithium-ion electrolyte, a battery and a preparation method of a battery, in particular to the high-capacity lithium-ion electrolyte and the battery using the high-capacity lithium-ion electrolyte and the preparation method of the battery. The electrolyte disclosed by the invention comprises lithium salt and non-aqueous organic solvent, and also consists of the following components in weight percent in terms of the total weight of the electrolyte: 0.5-7% of film-forming additive, 0-15% of flame-retardant additive, 2-10% of antiovefill additive, 0.01-2% of stabilizer and 0.01-1% of wetting agent; the electrolyte can enable the anode with high Ni content to work stably, and reduce the battery cost; the high-capacity lithium-ion battery can perform high ratio capacity and excellent safety and high temperature property and cyclic life fully due to the addition and synergetic functions of various functional additives.

Description

technical field [0001] The invention relates to a lithium ion electrolyte and a battery, in particular to a high-capacity lithium ion electrolyte, a battery using the electrolyte and a method for preparing the battery. Background technique [0002] There are four types of batteries commonly used at present: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are generally considered to have the following advantages: large specific energy; high specific power; small self-discharge; no memory effect; good cycle characteristics; fast discharge and high efficiency; wide operating temperature range; no environmental pollution, etc. It is expected to enter the ranks of the best power supply in the 21st century. [0003] The performance of a lithium-ion battery depends primarily on the structure and properties of the materials used inside the battery. These battery internal materials include positive elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/62
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 蒋灵刘建生张利萍李钊李永坤
Owner JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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