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Negative electrode with double conductive agents for power lithium ion battery

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant effect and increased cost, and achieve the effect of solving low-temperature charging difficulties

Inactive Publication Date: 2016-11-23
BEIJING BOSTON POWER BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as increased cost and inconspicuous effect, which only alleviate the problem, but fail to solve it effectively
These technologies mainly alleviate the problem from the external heating of the battery system, and there is no fundamental solution to the problem from the inside of the battery

Method used

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  • Negative electrode with double conductive agents for power lithium ion battery
  • Negative electrode with double conductive agents for power lithium ion battery
  • Negative electrode with double conductive agents for power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The dual conductive agent negative electrode for power lithium ion battery in the present embodiment is made of the following components by weight:

[0024]

[0025] In this embodiment, the conductive agent without lithium storage function is conductive carbon black SP; the conductive agent with lithium storage function is flake graphite KS-6; the binder is SBR (Styrene-butadiene rubber, styrene-butadiene rubber) bonding agent; thickener is CMC (sodium carboxymethylcellulose) thickener.

[0026] That is, SP:KS-6:SBR:CMC:C=1.5:0.5:2.5:1:94.5.

[0027] In order to test the negative electrode of this embodiment, the positive electrode material used in combination is NCM:SP:KS6:PVDF=94:1.5:1:3.5, and the material of the original negative electrode to be compared is C:SP:SBR:CMC=95 :1.5:2.5:1, 10Ah flexible packaging battery was prepared for comparison under the condition that the electrode and battery preparation process remained unchanged.

[0028] figure 1 It is the...

Embodiment 2

[0032] The weight ratio of each component in the present embodiment is:

[0033] SP: KS-6: SBR: CMC: C = 1: 1.5: 2: 0.8: 94.7.

Embodiment 3

[0035] The weight ratio of each component in the present embodiment is:

[0036] SP: KS-6: SBR: CMC: C=3:2:3:1.5:90.5.

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PUM

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Abstract

The invention provides a negative electrode with double conductive agents for a power lithium ion battery. The negative electrode is composed of the following components in parts by weight: 1-3 parts of a conductive agent without a lithium storage function, 0.5-2 parts of a conductive agent with the lithium storage function, 2-3 parts of a binding agent, 0.8-1.5 parts of a thickening agent and the balance of carbon, wherein the sum of all components in parts by weight is 100. Based on breakthrough of a traditional thinking model and modification of a negative electrode, a system of double conductive agents is adopted, so that the problems that low-temperature charging is difficult and low-temperature service life decay is quick are effectively solved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, gasoline-electric hybrid vehicles or energy storage power supply systems, in particular to a dual-conductive-agent negative electrode for a power lithium-ion battery. Background technique [0002] At present, electric vehicles have the practical problems of difficult charging and fast life decay in low temperature environments. How to make electric vehicles adapt to the temperature range of all climates is of great significance. To solve this problem, it is crucial to improve the performance of lithium-ion batteries, its core components. At present, the traditional solution is to improve the ionic and electronic conductivity of the electrode and increase the ion conductivity of the electrolyte. In terms of electronic conductivity, the graphite negative electrode has good conductivity, so it is only necessary to improve the ionic conductivity, while the positive electrode has weak elect...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587
CPCH01M4/587H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 安富强王浩然
Owner BEIJING BOSTON POWER BATTERY