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Lithium ion battery negative pole piece, making method thereof, and lithium ion battery

A technology of lithium ion battery and negative electrode sheet, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of easy piercing of lithium dendrites, battery short-circuit, danger, etc.

Inactive Publication Date: 2014-01-01
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] During the multiple cycles of the lithium-ion battery, the SEI film of the negative electrode gradually thickens, and the impedance of the negative electrode gradually increases. At this time, due to the low lithium intercalation potential of the negative electrode, in the case of high-current charging or the failure of the external protection circuit of the battery, the negative electrode Charging will reduce the lithium potential to below 0V, and electrons will be enriched at the negative electrode. Lithium ions will combine with electrons on the surface of the negative electrode before they can be embedded in the negative electrode surface, and then precipitate elemental lithium on the surface of the negative electrode. The precipitated elemental lithium may accumulate on the surface of the negative electrode. Lithium dendrites, the lithium dendrites are in contact with the separator, and the sharp lithium dendrites can easily pierce the separator, causing a short circuit in the battery and causing danger

Method used

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  • Lithium ion battery negative pole piece, making method thereof, and lithium ion battery
  • Lithium ion battery negative pole piece, making method thereof, and lithium ion battery

Examples

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Embodiment 1

[0022] see figure 1 As shown, this embodiment provides a negative electrode sheet for a lithium ion battery, which mainly includes: a metal current collector 101 , a carbon layer 102 and a lithium hypovanadate (ie LiVO2 ) layer 103 .

[0023] Wherein the carbon layer 102 is coated on the surface of the metal current collector 101 layer, and the LiVO2 layer 103 is coated on the surface of the carbon layer 102. The negative electrode can be a single-sided pole piece, or both sides have a carbon layer 102 and a LiVO2 layer 103 double-sided pole pieces.

[0024] The carbon layer 102 may be a soft carbon material layer, or a hard carbon material layer, or a graphite layer.

[0025] The sheet-making process of the negative electrode sheet can be as follows: use sodium carboxymethyl cellulose as a thickener, styrene-butadiene rubber as a binder and carbon materials in a predetermined ratio, stir fully, dissolve in water to obtain negative electrode slurry, The carbon slurry is coat...

Embodiment 2

[0028] see figure 2 As shown, this embodiment provides a lithium ion battery, which includes a separator 202, a positive electrode sheet 201, and a negative electrode sheet 203, and the separator 202 is evenly spaced between any positive electrode sheet 201 and negative electrode sheet 203.

[0029] Wherein the structure of the negative plate 203 is as follows figure 1 And shown in embodiment 1. The negative electrode sheet 203 can be a double-sided coating structure or a single-sided coating structure.

[0030] The positive electrode sheet 201 is composed of a metal current collector and a positive electrode active material coated on its surface, which can be either a single-sided coating structure or a double-sided coating structure. The positive electrode active material on the positive electrode sheet 201 can be LiCoO2, LiMn2O4, LiNiCo 1-xO2, LiNixCoyMn 1-x-yO2, LixFey(PO4)z, LixVy(PO4)z One or more mixtures, positive electrode activity The material is mixed and stirre...

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Abstract

The utility model relates to the lithium ion battery field, and discloses a cathode piece for a lithium ion battery and the lithium ion battery. The cathode piece comprises a metal current collector, a carbon layer is coated on the surface of the metal current collector, and a lithium hypovanadate layer is coated on the surface of the carbon layer. By means of the cathode piece, the avoidance of diaphragm piercing is facilitated, and the internal short-circuit rate of the lithium ion battery is reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a negative electrode sheet for lithium ion batteries, a preparation method and the lithium ion battery. Background technique [0002] Lithium secondary battery is a new type of chemical power source, which is mainly composed of positive electrode, battery separator, negative electrode, electrolyte and shell. When a lithium-ion battery is working, lithium ions can be intercalated and deintercalated between the positive active material and the negative active material. [0003] Due to the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect and low environmental pollution, lithium secondary batteries are widely used in communication equipment, mobile electronic equipment, electric tools, electric toys and aircraft models. It has been rapidly applied and popularized. In recent years, power lithium secondar...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/131H01M4/1393H01M4/1391H01M10/0525
CPCY02E60/122H01M4/13H01M4/139H01M4/366H01M4/383H01M4/5825H01M10/0525Y02E60/10
Inventor 曾纪术唐道平郭永兴陶芝勇曾坚义
Owner SHENZHEN HAIYING TECH
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