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High-voltage lithium nickel manganese oxide/graphite lithium ion battery and manufacturing method thereof

A lithium-ion battery, lithium nickel manganese oxide technology, applied in the field of high-voltage lithium nickel manganese oxide/graphite lithium ion battery production, can solve the problems of capacity decay, no use value, etc., to increase the capacity value and improve the specific capacity of the battery Play and optimize the effect of the ratio

Active Publication Date: 2016-11-23
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that the main reason for restricting its commercial large-scale application is that after being assembled into a full battery, the capacity will decline significantly with the cycle, and there is almost no use value.

Method used

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  • High-voltage lithium nickel manganese oxide/graphite lithium ion battery and manufacturing method thereof
  • High-voltage lithium nickel manganese oxide/graphite lithium ion battery and manufacturing method thereof
  • High-voltage lithium nickel manganese oxide/graphite lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 (comparative example)

[0047] A preparation method of a lithium ion battery, comprising the steps:

[0048] (1) Preparation of negative electrode plate: According to the conventional negative electrode slurry preparation method, the negative electrode material, conductive agent and binder are mixed and dissolved in deionized water according to the ratio of 90:2.5:2.5, and after full stirring, adjust the negative electrode aqueous slurry The viscosity of 3500mPa.s, the solid content of 32%. After the baking and filming process, the thickness is 0.166mm, and the surface density of one side of the negative electrode is 105g / m 2 The conventional negative pole piece;

[0049] (2) Preparation of positive electrode plate: According to the conventional method of preparing negative electrode plate, the positive electrode LNMO material, the binder PVDF, and the conductive agent AB are mixed uniformly and then added to the organic solvent NMP to prepare the positive e...

Embodiment 2

[0053] A preparation method of high-voltage nickel manganate / graphite lithium-ion battery, comprising the steps:

[0054] (1) Preparation of negative electrode slurry: the method is the same as that of Example 1, and the negative electrode slurry is prepared;

[0055] (2) Preparation of negative electrode sheet containing initial SEI film: After the negative electrode slurry is fully mixed and uniform, 3 wt% organic acid is added to prepare negative electrode slurry containing initial SEI film. A negative electrode sheet containing an initial SEI film was prepared, with a thickness of 0.166 mm and an areal density of 105 g / m on one side of the negative electrode. 2 ;

[0056] (3) Preparation of positive electrode plate: According to the conventional method for preparing negative electrode plate, the positive electrode LNMO material, the binder PVDF, and the conductive agent AB are mixed uniformly and then added to the organic solvent NMP to prepare the positive electrode slur...

Embodiment 3

[0060] A preparation method of high-voltage nickel manganate / graphite lithium-ion battery, comprising the steps:

[0061] (1) The previous steps were the same as those in Example 2, and a negative pole piece containing an initial SEI film was prepared;

[0062] (2) Preparation of 2wt% LTO-coated LNMO cathode electrode:

[0063] First, a 2wt% LTO-coated LNMO composite cathode material was prepared:

[0064] Dissolve 1.6g of LNMO cathode material in deionized water, add 0.02g of surfactant F127 and mix to obtain solution A;

[0065] Weigh 0.096g of titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in 50ml of deionized water, and urea was added as a precipitating agent. According to the titanium sulfate / urea molar ratio of 1:2, a 0.5mol / l titanium sulfate aqueous solution was prepared to obtain B liquid. The amount of titanium sulfate added should ensure that TiO 2 is 2wt% of the mass of LNMO;

[0066] Slowly add liquid B into liquid A which is constantly stirring, and after sti...

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Abstract

The invention discloses a lithium nickel manganese oxide (LNMO) / graphite lithium ion battery and a manufacturing method thereof. The surface of a negative electrode is modified through an organic acid ester and components of an SEI (Solid-Electrolyte Interface) film are changed; the stability of an electrolyte and electrode interface is enhanced, so that the sharp attenuation of a capacity is effectively stopped. By optimizing electrolyte and adding a functional additive into traditional organic electrolyte, the first-time efficiency of the battery is improved, the self discharge of the battery is inhibited, the specific capacity of the battery is improved, and the battery with a high specific capacity and a long cycle is realized. In order to further stabilize efficient running of the LNMO / graphite lithium ion battery with the high specific capacity and the long cycle and improve the stability of the battery, the invention further provides modification in the aspect of a positive electrode. An LNMO@LTO positive electrode material is prepared by covering LNMO by Li4Ti5O12 so that a covering layer can effectively avoid direct contact between the electrolyte and an active material body, the overflowing of Mn from the positive electrode material is reduced and the further catalysis effect on the SEI film by the Mn is reduced, and furthermore, the system becomes relatively stable.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a manufacturing method of a high-voltage lithium nickel manganate / graphite lithium ion battery. Background technique [0002] As a new type of energy storage device, lithium-ion batteries have the advantages of higher energy density and operating voltage, long service life and low environmental pollution compared with traditional secondary batteries, and with the development of lithium-ion battery technology, The application market of lithium-ion batteries will be wider and deeper. However, relative to the rapid development of modernization and industry needs, the performance of lithium batteries needs to be further improved. According to the goals mentioned in the "Energy Conservation and New Energy Vehicle Industry Development Plan (2012-2020)" promulgated by the State Council, the energy density of the power battery module will reach 300Wh / kg by 2020 (the corres...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M4/133H01M4/1393H01M4/131H01M4/1391H01M4/62H01M10/0567
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/62H01M10/0525H01M10/0567H01M10/058H01M2220/20H01M2300/0025Y02E60/10Y02P70/50
Inventor 李庆余解雪松王红强黄有国赖飞燕顾慈兵孙铭雪朱传奇
Owner GUANGXI NORMAL UNIV
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