Lithium ion battery and preparation method thereof

A lithium-ion battery and ionic liquid technology, applied in the field of lithium-ion batteries and their preparation, can solve the problems of low electronic conductivity and ion diffusion rate, low initial charge and discharge efficiency, and inability to meet high voltage, etc., and achieve a wide electrochemical window , excellent charging and discharging platform, good cycle performance effect

Active Publication Date: 2012-05-23
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, LiNiO 2 The theoretical capacity is relatively high (275mAh / g), but the thermal stability is poor, the preparation is difficult, side reactions are prone to occur, and the generated products affect the capacity and cycle performance of the battery; while LiMn 2 o 4 Poor cycle performance and low specific capacity (theoretical specific capacity is only about 148mAh / g), which is mainly due to the 3+ Prone to disproportionation reactions and Jahn-Telle distortion effects
LiMPO with olivine structure 4 (M=Fe, Co, Mn, Ni, V, etc.) polyanionic compounds have the advantages of better stability and safety, especially Co, Mn, Ni, V systems have higher working voltage, It has attracted much attention in improving the energy density of lithium-ion batteries, but its special structure makes this type of material extremely low in electronic conductivity and ion diffusion rate.
[0004] Most commercial lithium-ion battery anode materials use graphite materials. This type of material has obvious disadvantages: lithium dendrites are precipitated, the first charge and discharge efficiency is low, and it interacts with the electrolyte, and there is a voltage hysteresis.
Due to the low window voltage, the current lithium-ion battery electrolyte can no longer meet the requirements of high voltage (>5V)

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0034] The embodiment of the present invention also provides the preparation method of above-mentioned lithium ion battery, see figure 1 and figure 2 shown, including the following steps:

[0035] S1. Preparation of positive electrode sheet 21: preparation of LiMPO 4 - graphene composite, then the LiMPO 4 -The positive electrode coating solution prepared by mixing the graphene composite with the conductive agent and the binder is coated on the positive electrode substrate to form the positive electrode sheet 21, wherein M is at least one of Fe, Co, Mn, Ni, V in one kind;

[0036] S2. Preparation of the negative electrode sheet 22: obtaining Li 4 Ti 5 o 12 and graphene oxide solution, and then the Li 4 Ti 5 o 12 After the precursor is mixed with the graphene oxide solution, followed by drying, roasting under anaerobic conditions, and cooling to obtain the Li 4 Ti 5 o 12 - graphene composite, then the Li 4 Ti 5 o 12 -The negative electrode coating solution prepar...

Embodiment 1

[0061] Lithium-ion battery structure such as figure 1 As shown, the lithium-ion battery includes a casing 1 , a cell 2 wrapped in the casing 1 , and an ionic liquid electrolyte 3 , and the electrolyte 3 is distributed around the cell 2 . The battery cell 2 includes a positive pole piece 21, a negative pole piece 22 and a diaphragm 23. The polypropylene diaphragm 23 separates the positive pole piece 21 from the negative pole piece 22, and the positive pole tab 24 and the negative pole tab 25 are respectively drawn from the positive pole piece 21 and the negative pole piece 22. , one end of the positive pole tab 24 and one end of the negative pole tab 25 extend out of the casing 1; the positive pole sheet 21 comprises aluminum foil and a positive coating bonded on the surface of the aluminum foil, the positive coating is LiFePO by mass ratio 4 -Graphene composite: acetylene black: polyvinylidene fluoride (PVDF) is a mixture of 84:8:8, the thickness of the positive electrode coat...

Embodiment 2

[0075] Lithium-ion battery structure is the same as embodiment 1, and wherein, positive electrode coating thickness is 50 μ m, and negative electrode coating thickness is 50 μ m, and ionic liquid electrolyte solution 3 is the N that concentration is 1mol / L, N-diethyl-N-methyl- N-methoxyethyl tetrafluoroborate solution. see details figure 1 shown.

[0076] The lithium-ion battery is assembled and left to stand for 12 hours to be tested. The test method is the same as in Example 1, and its performance is similar Figure 5 shown.

[0077] Among them, the cathode material is LiMnPO 4 / Preparation of graphene:

[0078] (1) LiMnPO 4 Preparation: 1moL of NH 4 h 2 PO 4 and 1moL of MnSO 4 Dissolve in deionized water to form a uniformly dispersed mixture with a concentration of 0.5mol / L. Slowly add 1moL of LiOH solution to the mixture under stirring, and pass in nitrogen as a protective gas to prevent the oxidation of ferrous iron to obtain pale gray Precipitate, continue to s...

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Abstract

The invention discloses a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a shell, ionic liquid electrolyte, positive plates, negative plates and diaphragms, wherein the ionic liquid electrolyte, the positive plates, the negative plates and the diaphragms are coated in the shell; the diaphragms are used for dividing the positive plates from the negative plates; each positive plate comprises a positive substrate and a positive coating which is combined on the surface of the positive substrate; the positive coating comprises a LiMPO4-graphene composite, wherein M is at least one of Fe, Co, Mn, Ni and V; each negative plate comprises a negative substrate and a negative coating which is combined on the surface of the negative substrate; and the negative coating comprises a Li4Ti5O12-graphene composite. The invention also discloses a preparation method for the Li4Ti5O12-graphene composite. The lithium ion battery has high energy density, high power density, better circulation performance and stable performance. The preparation method for the Li4Ti5O12-graphene composite is a simple in process and has high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Since Andre K. Geim (Andre K.Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004. Due to its unique structure and optoelectronic properties, it has attracted extensive attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity and low thermal expansion coefficient. In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale structural properties of monomolecular layers can be widely used in electrode materials. Therefore, graphene materials are used as electrode materials for supercapacitors and lithium-ion batteries. [0003] In 1990, Japan's SONY company successfully launched a commerci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M10/0564H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 周明杰王要兵潘军
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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