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Secondary battery

A secondary battery and voltage technology, applied to secondary batteries, battery electrodes, circuits, etc., can solve the problems of serious expansion of silicon-based materials, deterioration of battery cycle performance, and restrictions on the application of silicon-based materials, etc., and achieve good Coulombic efficiency for the first time , the effect of high energy density

Active Publication Date: 2021-12-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, silicon-based materials have serious swelling problems during use, which leads to deterioration of battery cycle performance, which greatly limits the application of silicon-based materials in commercial products

Method used

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Embodiment 1

[0089] 1) Preparation of positive electrode sheet

[0090] The cathode active material LiNi 0.8 mn 0.1 co 0.1 o 2 (NMC811), conductive agent SP, and binder PVDF are fully stirred and mixed in an appropriate amount of NMP at a weight ratio of 95:1.5:3.5 to form a uniform positive electrode slurry; apply the positive electrode slurry to the aluminum foil of the positive electrode current collector After drying and cold pressing, the positive electrode sheet is obtained.

[0091] 2) Preparation of negative electrode sheet

[0092] The negative electrode active material shown in Table 1, the conductive agent SP and CNT, and the binder polyacrylate sodium (PAAS) are fully stirred and mixed in an appropriate amount of deionized water according to a certain weight ratio (see Table 1 for details), so that it forms a uniform Negative electrode slurry: apply the negative electrode slurry on the copper foil of the negative electrode collector, dry and cold press to obtain the negati...

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Abstract

The application discloses a secondary battery, including a positive pole piece, a negative pole piece, a separator, and an electrolyte. The positive active material of the secondary battery includes lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide. One or more, the negative electrode active material includes silicon oxide compound and graphite; the negative electrode sheet and the lithium metal sheet are prepared into a button battery, and the lithium is inserted at a constant current rate of 0.1C to a voltage of 0.005V, and then constant at a rate of 0.05C Flow intercalation of lithium to a voltage of 0.005V, and then constant current delithiation at a rate of 0.1C to a voltage of 1.2V. The delithiation capacity A of the negative electrode diaphragm in the voltage range from 0.005V to the delithiation platform voltage is the same as that of the negative electrode diaphragm during delithiation. The delithiation capacity B in the voltage range from the platform voltage to 1.2V satisfies 1≤A / B≤2; and when the secondary battery is discharged to a voltage of 2.5V, the voltage U of the negative pole piece relative to the lithium metal reference electrode 0.5V≤U≤0.7V. The secondary battery of the present application can simultaneously take into account higher energy density, first coulombic efficiency and better cycle performance.

Description

technical field [0001] The present application belongs to the technical field of energy storage devices, and in particular relates to a secondary battery. Background technique [0002] As environmental protection issues are paid more and more attention, environmentally friendly secondary batteries are gradually being applied to consumer electronics and electric vehicles. Among them, the energy density and cycle life of batteries are increasingly valued by end consumers. Compared with traditional carbon-based materials, silicon-based materials have extremely high theoretical gram capacity, which is about ten times that of carbon-based materials. Therefore, silicon-based materials have been widely studied. [0003] However, silicon-based materials have serious swelling problems during use, which leads to deterioration of battery cycle performance, which greatly limits the application of silicon-based materials in commercial products. Contents of the invention [0004] In v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/48H01M4/587H01M4/505H01M4/525H01M10/058
CPCH01M10/0525H01M4/362H01M4/483H01M4/587H01M4/505H01M4/525H01M10/058H01M2004/021H01M2004/027Y02E60/10Y02P70/50H01M4/485H01M4/131H01M4/1391H01M4/0404H01M4/364H01M4/1393H01M4/133
Inventor 官英杰赵玉珍温严黄起森刘欣
Owner CONTEMPORARY AMPEREX TECH CO