High-energy-density lithium ion battery and preparation method thereof

A lithium-ion battery, high energy density technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problem of excluding transition metal oxides, etc., to improve rate performance, reduce contact resistance, and improve cycle. The effect of stability

Inactive Publication Date: 2014-07-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positive electrode material for lithium-ion batteries proposed by it is a composite electrode composed of at least two positive electrode active materials, and the selected negative electrode material does not include transition metal oxides based on the transformation reaction mechanism to realize the lithium storage function.

Method used

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  • High-energy-density lithium ion battery and preparation method thereof
  • High-energy-density lithium ion battery and preparation method thereof
  • High-energy-density lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment prepares high-energy-density lithium-ion batteries according to the following steps:

[0033] 1. Preparation of positive electrode sheet: lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 Positive electrode active material (its XRD figure is as shown in figure 1 shown), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 80:10:10, and the mixture is prepared into a slurry with 1-methyl-2-pyrrolidone (NMP). coated on an aluminum foil current collector with a thickness of 20 μm, dried at 65° C., and sliced ​​to obtain a positive electrode sheet.

[0034] In order to test the performance of the obtained positive electrode sheet, the positive electrode sheet and the lithium sheet were assembled into a half-cell, and its electrochemical performance and cycle performance were tested at different rates. The results are as follows: figure 2 shown. Its charge-discharge curves at diffe...

Embodiment 2

[0041] This embodiment prepares high-energy-density lithium-ion batteries according to the following steps:

[0042] 1. Preparation of positive electrode sheet: LiNi 0.5 mn 1.5 o 4 The positive electrode active material, conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 80:10:10, and the mixture is prepared into a slurry with 1-methyl-2-pyrrolidone (NMP). coated on an aluminum foil current collector with a thickness of 20 μm, dried at 65° C., and sliced ​​to obtain a positive electrode sheet.

[0043] 2. Preparation of the negative electrode sheet: Clean the base of the foamed nickel metal current collector, then put it into a 40mL aqueous solution containing 1mmol / L NiSO4 and 10mmolurea, react for 6h under hydrothermal conditions at 100°C, wash and dry, Calcined at 300°C for 6h in air to obtain NiO thin film.

[0044] 3. Battery assembly: Assemble the battery core in the order of positive electrode sheet-d...

Embodiment 3

[0047] This embodiment prepares high-energy-density lithium-ion batteries according to the following steps:

[0048] 1. Preparation of positive electrode sheet: 0.5Li 2 MnO 3 0.5LiMO 2 The positive electrode active material, conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 75:15:10, and the mixture is prepared into a slurry with 1-methyl-2-pyrrolidone (NMP). coated on an aluminum foil current collector with a thickness of 20 μm, dried at 65° C., and sliced ​​to obtain a positive electrode sheet.

[0049] 2. Preparation of the negative electrode sheet: clean the base of the foamed nickel metal current collector, and then put 40mL of 0.1mol / L Cu(NO 3 ) 2 In the aqueous solution, add 3 mL of 0.5 mol / L NH 3 ·H 2 O aqueous solution was reacted in a water bath at 60° C. for 4 h, washed and dried to obtain a CuO nanosheet film.

[0050] 3. Battery assembly: Assemble the battery core in the order of positive el...

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Abstract

The invention discloses a high-energy-density lithium ion battery and a preparation method thereof. The high-energy-density lithium ion battery comprises a battery shell, a battery cell which is arranged in the battery shell and electrolyte which fills the battery shell, wherein the battery cell comprises a positive pole piece, a negative pole piece and a diaphragm. The high-energy-density lithium ion battery is characterized in that a high-voltage lithium nickel manganate material or a high-specific-capacity lithium-rich manganese-based material is used as an active material of the positive pole piece; a transitional metal oxide film growing on a metal current collector substrate is used as the negative pole piece. According to the method, the transitional metal oxide film is not activated to form the lithium ion battery directly with the positive electrode, lithium ions which are released out of the positive material and cannot be embedded back into the positive material or a minority of positive capacity which is sacrificed is used as a lithium source needed by the transitional metal oxide negative electrode when an SEI film is formed in the primary discharging process, so that the production process of the lithium ion battery is simplified, and the lithium ion battery can have high energy density.

Description

technical field [0001] The invention relates to a lithium-ion battery with high energy density and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] The next-generation lithium-ion power battery, which is mainly used in electric vehicles and grid energy storage, requires higher energy density under the basic conditions of safety, environmental protection, cost, and service life. There are two ways to increase the energy density of the battery: one is to increase the specific capacity of the positive and negative electrode materials. The second is to increase the working voltage of the material. High-voltage lithium nickel manganese oxide and its modified materials and lithium-rich manganese-based materials with high specific capacity are considered to be ideal candidates for the anode materials of next-generation lithium-ion batteries. At present, the commercialized negative electrode is graphite material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/131H01M10/058
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 张卫新马国杨则恒王强谷和云曾晖陆剑波陈公德张颖朦
Owner HEFEI UNIV OF TECH
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