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A lithium ion secondary battery

A secondary battery, lithium ion technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of reducing cycle performance, reducing battery mass specific capacity, etc. The effect of capacity

Active Publication Date: 2016-01-20
JIANGSU TENPOWER LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the positive electrode of lithium-ion batteries, most of the current lithium-ion batteries will pay the price of reducing the mass-specific capacity of the battery and reducing the cycle performance after satisfying the high-rate discharge performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention will be described in detail below by way of examples.

[0020] For the negative electrode, it is made by the following steps:

[0021] The first step, adding 100 parts by weight of raw material silicon and 200 parts by weight of raw material copper into the ball mill tank of the ball mill, wherein the weight ratio of the weight of the ball mill to the raw material is 12:1, the ball mill tank is closed and the air is extracted and filled with nitrogen. Perform ball milling for 30 hours to obtain the negative active material;

[0022] In the second step, 100 grams of negative electrode active material and 10 grams of polyvinyl alcohol are added into 150 grams of water, and then stirred in a vacuum mixer to form a uniform slurry. Coat the entire slurry on a 1 μm copper foil, dry it at 70°C for 15 hours, and roll the dried pole piece under a pressure of 2 MPa for 3 seconds;

[0023] In the third step, the calendered negative electrode is cut into the...

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Abstract

The invention discloses a lithium ion secondary battery. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece, and a diaphragm and electrolyte arranged between the positive pole piece and the negative pole piece; a negative pole comprises a current collector and a discontinuous layer; the discontinuous layer comprises silicon and an active material I; a positive pole comprises a conductive base body, a conductive agent, an anode active material and a bonding agent; the conductive agent comprises a modified multi-wall carbon nano tube and a conductive agent I. According to the lithium ion secondary battery, the mass specific capacity of the lithium ion battery is improved and the cycling performance of the battery is not reduced.

Description

technical field [0001] The invention relates to batteries, in particular to a lithium ion secondary battery. Background technique [0002] Since the promotion of commercialization, lithium-ion batteries have been widely used as a variety of portable electronic devices due to their high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design of size and shape according to actual needs. The power supply of electrical appliances, these broad application fields and various practical needs have greatly promoted the development of lithium-ion batteries. For the positive electrode of lithium-ion batteries, most of the current lithium-ion batteries will pay the price of reducing the mass-specific capacity of the battery and reducing the cycle performance after satisfying the high-rate discharge performance. For the negative electrode of lithium-ion batteries, in recent years, silicon has been widely and meticulous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/134
CPCH01M4/134H01M4/364H01M4/38H01M4/386H01M4/42H01M4/624H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 陈璇钱国珠沈春平黄满湘秦丽苏乐乐
Owner JIANGSU TENPOWER LITHIUM