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Design method of high-specific-energy lithium ion battery with both electrochemical performance and safety performance

A lithium-ion battery, safety performance technology, applied in electrochemical generators, material electrochemical variables, non-aqueous electrolyte storage batteries, etc., can solve problems such as difficult electrochemical performance and safety performance, and low development efficiency

Active Publication Date: 2021-11-16
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is: to overcome the low efficiency of lithium-ion battery development in the prior art, difficult to balance the electrochemical performance and safety performance

Method used

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  • Design method of high-specific-energy lithium ion battery with both electrochemical performance and safety performance
  • Design method of high-specific-energy lithium ion battery with both electrochemical performance and safety performance
  • Design method of high-specific-energy lithium ion battery with both electrochemical performance and safety performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Selecting: Select the material having an oxidative reducing activity under high voltage, the molecular formula is a layered structure of LINI x CO y M (1-x-y) O 2 Where x is greater than or equal to 0.8 less than 1, y <0.1, m is manganese Mn, vanadium V, ruthenium Ru and molybdenum moles, etc., with redox activity at high voltages, or has a certain interpretation capacity. If manganese-rich high-nickel material has a certain anion oxidation reduction reaction in a high voltage under feature, and molybdenum has a higher oxidative value.

[0032] Preparation: Prepare a lithium ion buckle battery, and activate 2-3 shampoo has stable electrochemical properties;

[0033] Evaluation: Verify the lithium ion buckle battery, evaluate the oxidative capacity and electrochemical properties of the materials to be evaluated:

[0034] Lithium ion buckle batteries are over 6V at room temperature or high temperature 45-80 ° C;

[0035] Collect voltage V - time T curve to obtain differential...

Embodiment 2

[0044] The present example includes:

[0045] Selection: Select the positive material A (LINI) required to evaluate 0.8 CO 0.05 M 0.15 O 2 ), Under normal temperature conditions, have an oxidative capacity of anion oxygen under high pressure, and a sample positive material B (Lini 0.8 CO 0.1 Al 0.1 O 2 ) Basically, there is no high voltage redox capacity. At high temperatures, the oxygen activity of both is enhanced, and the known sample is also reflected. Both are high-nickel materials, and the nickel content is greater than 80%, with similar and higher specific capacity and similar crystal structures; it is known that both electrochemical properties on all-batteries are similar, electrochemical performance is excellent, two The loop life curve is as follows figure 1 Indicated.

[0046] The battery is prepared as follows: Preparation of the diaphragm polyethylene PE or polypropylene PP for the buckle battery is 16 microns; the electrolyte group is a certain proportion of vinyl ca...

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Abstract

The invention discloses a design method of a high-specific-energy lithium ion battery with both electrochemical performance and safety performance. The design method comprises the steps of selecting materials, specifically, selecting materials with oxidation-reduction activity under high voltage as materials to be evaluated; conducting preparation, specifically, preparing a lithium ion button battery taking the to-be-evaluated material as a positive electrode; performing evaluation, specifically, verifying the button battery, and evaluating the oxidation capacity and electrochemical performance of the to-be-evaluated material; and conducting material selection, specifically, preferably selecting from the multiple to-be-evaluated materials to obtain the positive electrode material with both electrochemical performance and safety performance. According to the method disclosed by the invention, the positive electrode of the battery is screened by utilizing the high-voltage oxidation-reduction activity and gas production behavior of the positive electrode material, so that the overcharge temperature rise is controlled within a certain range, and the overcharge safety performance of the lithium battery is improved; and meanwhile, the overcharge safety performance of the positive electrode material can be rapidly evaluated, the research and development efficiency is improved, and the development cost is saved.

Description

Technical field [0001] The present invention relates to the field of lithium batteries, and more particularly to the design of a lithium battery. Background technique [0002] As the nickel content is increasing, the energy density of the lithium battery is rapidly improved, but the safety problem such as thermal out of control is also highlighted. The positive electrode material, especially the high nickel positive material, is unstable under high potential high-de-lithium state, and it is easy to release oxygen and generate heat. The positive electrode material is easy to discharge a large amount of heat with a severe sub-reaction of the organic electrolyte, causing the battery temperature rise rapidly. The rise in temperature will further promote the decomposition of the positive electrode material, exacerbate the exothermic side reaction, and eventually cause thermal out of control. Especially under electrical abuse conditions, such as excessive charge, the battery is extreme...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525G01R31/385G01N27/26
CPCH01M10/058H01M10/0525G01R31/3865G01N27/26Y02P70/50Y02E60/10
Inventor 赵南南李国华喻碧永孙新科李东亮
Owner SHENZHEN BAK POWER BATTERY CO LTD
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