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Lithium ion battery

A lithium-ion battery and battery positive electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of excessive gas production

Pending Publication Date: 2021-07-16
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a lithium-ion battery for the problem of excessive gas production during the battery formation process of the existing ternary nickel-cobalt-manganese and nickel-cobalt-aluminum battery positive electrode material systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 1) Preparation of nonaqueous electrolyte

[0084] Ethylene carbonate (EC), diethyl carbonate (DEC) and methyl carbonate (EMC) were mixed by mass DEC: DEC: EMC = 3: 5: 5: 2, then hexafluorophosphate (LIPF 6 The molar concentration was 1 mol / L, and then the total mass of the nonaqueous electrolytic solution was 1% 1% of Compound 1 and 0.3% of Compound 12 shown in Table 1.

[0085] 2) Preparation of the positive plate

[0086] Press 93: 4: 3 quality than mixed positive electrode active material lithium nickel-cobalt manganese oxide Lini 0.8 CO 0.1 Mn 0.1 The active material is doped or coated with an aluminum compound, and the mass ratio of aluminum nickel is 2.5% conductive carbon black super-p and binder polyvinylidene fluoride (PVDF), and then mix them in N-A Census-2-pyrrolidone (NMP) is obtained by a positive electrode slurry. The node slurry is evenly applied to both surfaces of the aluminum foil, dried, caulced, and vacuum dry, and welded to the aluminum lead by the u...

Embodiment 2～9

[0096] As in the process of Example 1, the difference is:

[0097] In the preparation step of the nonaqueous electrolytic solution, the mass percentage of the mass shown in Table 1 in Table 1 is added in Table 1 in Table 1 in Table 1 in Table 1, in the preparation of the nonaqueous electrolyte. Component.

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Abstract

The invention belongs to the technical field of new energy, and particularly relates to a lithium ion battery, which comprises a battery positive electrode, a battery negative electrode and a non-aqueous electrolyte, wherein the battery positive electrode comprises a nickel-containing positive electrode active material, the nickel-containing positive electrode active material is doped with an aluminum metal element, the mass of nickel in the nickel-containing positive electrode active material is x, the mass of aluminum is y, x is greater than 0, and y / x is no smaller than 0 but smaller than 5%; the non-aqueous electrolyte comprises compounds as shown in a structural formula 1 and a structural formula 2, the two compounds are combined to react, the process of disproportionation reaction between the structural formula 1 is prevented, gas production of the battery in the formation stage is reduced, battery bulging is reduced, and a disulfate long-chain structure generated by combination of the two compounds has high stability, and the structure is not easy to decompose under high-temperature conditions, and the high-temperature storage and cycle performance of the battery can be improved.

Description

Technical field [0001] The invention belongs to the field of new energy technologies, and more particularly to a lithium ion battery. Background technique [0002] The lithium-ion battery has a high operating voltage, and the highest voltage of the lithium lithium phosphate system can reach 3.65V, the three yuan, and the lithium cobalt-based system can reach 4.5V. Moreover, because it does not contain heavy metal environment, reversible circulating life is long, it has become an important passage of alternative oil and coal and other fossil fuels. The development route dominated by lithium-ion batteries is rising to the national strategic level. At present, Europe and the United States Japan and South Korea will further follow up. Since the 1990s, lithium-ion batteries have been widely used in the 3C system, which is very mature. In the new energy vehicle field, it is also a sudden rise in the past ten years. [0003] In a nonaqueous lithium-ion battery, nonaqueous electrolyte is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0567
CPCH01M10/0525H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0567H01M2300/0025H01M4/62Y02E60/10
Inventor 钱韫娴员晓刚邓永红胡时光刘伟新
Owner SHENZHEN CAPCHEM TECH CO LTD
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