Lithium ion battery negative electrode, preparing method of lithium ion battery negative electrode and lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied in the field of lithium-ion battery negative electrodes and its preparation, can solve problems such as battery failure and potential safety hazards, and achieve the effects of easy operation, guaranteed service life and safety performance, and simple process

Active Publication Date: 2014-10-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problem that the lithium-ion battery in the prior art has the problem of over-discharge, or even the battery fails due to the over-discharge cycle, or there are potential safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The present invention also provides a preparation method for the negative electrode of the lithium ion battery, comprising the following steps:

[0023] S10, mixing the perovskite-type solid electrolyte with a binder and a solvent to prepare an electrolyte slurry; coating the electrolyte slurry on the surface of the negative electrode current collector, drying and rolling to obtain a current collector with an electrolyte coating on the surface ;

[0024] S20, coating the negative electrode slurry corresponding to the negative electrode material layer on the surface of the current collector with the electrolyte coating on the surface obtained in step S10, drying and rolling to obtain the negative electrode of the lithium ion battery. The preparation method of the negative pole of the lithium ion battery provided by the invention has simple process and easy operation.

[0025] Specifically, according to the method of the present invention, the electrolyte slurry containi...

Embodiment 1

[0032] The perovskite solid electrolyte material is Li 0.5 La 0.5 TiO 3 , the median particle size is 0.2 μm, the negative electrode active material is modified artificial graphite, and the median particle size is 15 μm.

[0033] (1) With water as solvent, CMC and SBR as binder, according to Li 0.5 La 0.5 TiO 3 : CMC: SBR: water = 100: 5: 5: 200 weight ratio to prepare the electrolyte slurry; put 2L of the electrolyte slurry in the slit coating equipment, adjust the distance between the blades of the coating machine to 30 μm, and the electrolyte slurry The material is evenly and intermittently coated on both sides of copper foil (copper foil size: width 160mm, thickness 16μm), dried at 120°C, and processed in a roller press under a pressure of 5MPa to obtain a surface with a thickness of 1 μm electrolyte-coated copper foil current collector.

[0034] (2) Add 940 grams of negative electrode active material artificial graphite (94wt%), 30 grams of binder CMC (3wt%) and 30 ...

Embodiment 2

[0037] The lithium-ion battery negative electrode J2 and lithium-ion battery A2 of this example were prepared in the same steps as in Example 1, the difference being:

[0038] In step (1), Li with a median particle size of 0.2 μm was used 0.32 La 0.56 Nb 2 o 6 As the perovskite solid electrolyte material of the present embodiment to replace the Li 0.5 La 0.5 TiO 3 .

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Abstract

The invention provides a lithium ion battery negative electrode, which comprises a current collector, a negative electrode material layer and an electrolyte coating, wherein the electrolyte coating is positioned between the negative electrode material layer and the current collector and consists of perovskite type solid electrolytes and bonding agents, and the chemical formula of the perovskite type solid electrolytes is A<x>B<y>TiO<3>, A<x>B<y>Ta<2>O<6>, A<x>B<y>Nb<2>O<6> or A<h>M<k>D<n>Ti<w>O<3>. The invention also provides a preparing method of the lithium ion battery negative electrode and a lithium ion battery adopting the lithium ion battery negative electrode. The lithium ion battery adopting the lithium ion battery negative electrode provided by the invention can withstand multi-time over discharging cycles, and the service life and the safety performance of the battery are ensured. Meanwhile, the preparing method of the lithium ion battery negative electrode provided by the invention has the advantages that the process is simple, and the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode, a preparation method thereof, and a lithium ion battery using the lithium ion battery negative electrode. Background technique [0002] Lithium-ion batteries have a wide range of applications due to their high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no pollution, and light weight. At present, the negative electrode of lithium-ion batteries generally adopts a single-layer active material layer. Specifically, the active material such as graphite is uniformly mixed with a binder, a solvent, etc. to make a slurry, and then coated on a copper foil current collector to form a negative electrode. electrode. The negative electrode, positive electrode, separator, etc. are wound or laminated to form a battery cell, and then the battery cell is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/42
CPCY02E60/122H01M4/13H01M4/139H01M10/0525H01M10/0562Y02E60/10
Inventor 马永军苟容郭姿珠
Owner BYD CO LTD
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