Power and energy storage lithium-ion battery and preparation method thereof

A lithium-ion battery and energy storage technology, applied in the field of lithium-ion batteries, can solve the problems of low overall battery capacity, low initial efficiency, difficult to exert excellent performance, etc., to achieve overall capacity and initial efficiency improvement, improve energy density, good safety Effects of Features

Active Publication Date: 2013-12-11
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, soft carbon and hard carbon have a certain disordered structure in their internal structure, which leads to their initial efficiency lower than that of graphite materials. The capacity design of the existing battery preparation method is adopted, that is, the positive and negative active materials are processed by reversible specific capacity. Battery design will lead to low overall capacity of the battery, making it difficult to exert excellent performance

Method used

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  • Power and energy storage lithium-ion battery and preparation method thereof
  • Power and energy storage lithium-ion battery and preparation method thereof
  • Power and energy storage lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The model of the prepared battery is P85120190 / 14Ah. The cells are laminated and packaged with aluminum-plastic film to form a soft pack power and energy storage lithium battery. The physical and chemical indicators of the negative active material soft carbon are shown in Table 1. The gram capacity of the positive and negative active materials is designed according to the gram capacity of the first delithiation and the first lithium intercalation, respectively, and the capacity matching design of the positive and negative electrodes is designed according to the ratio of the negative electrode capacity to the positive electrode capacity of 108%. The specific design method is shown in Table 2.

[0046] (1) Mix 94.5wt% soft carbon, 2.0wt% carbon black, 1.5wt% carboxymethyl cellulose, 2.0wt% styrene-butadiene rubber and solvent water to form a slurry, and evenly coat it on the copper foil Above, the coating surface density is 140g / m on both sides 2 , after baking, rolling, ...

Embodiment 2

[0065] The battery was prepared by the same method as in Example 1, except that the capacity matching design of the positive and negative electrodes was designed according to the ratio of the capacity of the negative electrode to the capacity of the positive electrode as 100%.

[0066] After capacity analysis, the actual 1C capacity of the battery is more than 14.8Ah, the energy density of the battery cell is more than 150Wh / Kg, the 1C gram capacity of the positive electrode active material is 158mAh / g or more, and the 1C gram capacity of the negative electrode active material is 258mAh / g or more. The first discharge efficiency is over 85%.

[0067] Then, the battery was subjected to a charge-discharge cycle performance test at room temperature at 5C. After testing, the capacity retention rate of the battery after 1000 cycles was 86.7%.

[0068] After putting the battery at -40°C for 8 hours, discharge it at 1C, and the discharge capacity is greater than 53%.

[0069] After t...

Embodiment 3

[0072] The battery was prepared by the same method as in Example 1, except that the capacity matching design of the positive and negative electrodes was designed according to the ratio of the capacity of the negative electrode to the capacity of the positive electrode at 150%.

[0073]After capacity analysis, the actual 1C capacity of the battery is more than 13.2Ah, the 1C gram capacity of the positive electrode active material is more than 142mAh / g, the 1C gram capacity of the negative electrode active material is more than 237mAh / g, and the first charge and discharge efficiency is 81.6%.

[0074] Then, the battery was subjected to a charge-discharge cycle performance test at room temperature at 5C. After testing, the capacity retention rate of the battery was 84.7% after 1000 cycles.

[0075] After the battery is fully charged and overcharged at 3C / 12V, the battery has no fire or explosion, and the highest temperature on the battery surface is 42°C.

[0076] The voltage ran...

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Abstract

The invention relates to a preparation method of a power and energy storage lithium-ion battery. A negative active substance of the power and energy storage lithium-ion battery comprises soft carbon, hard carbon, a mixed material of soft carbon and graphite and a mixed material of hard carbon and graphite. The designing method of the battery comprises the steps of designing the gram volume of the negative active substance as the primary lithium-embedding gram volume, designing the gram volume of the positive active substance as the primary lithium-removal gram volume, designing the ratio of the capacity of the positive electrode and the capacity of the negative electrode to be (1: 1) to (1.5: 1). By adopting the designing method, the capacity and comprehensive performance of the battery can be remarkably improved, and excellent lithium-embedding and lithium-removal capacity of the soft carbon material and the hard carbon material can be adequately exerted. Compared with the existing lithium battery technology, the prepared power lithium battery has long service life, high multiplying power, high safety performance and excellent low-temperature performance and can be widely applied to the fields such as electric tools, various portable devices, spaceflight, starting power supply and the like.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular, the invention relates to a power and energy storage lithium ion battery and a preparation method thereof. Background technique [0002] With the continuous development of the new energy industry, in the field of power and energy storage batteries, lithium-ion batteries, as green and environmentally friendly new energy batteries, have developed extremely rapidly. With the expansion of the application field of lithium batteries, higher requirements are put forward for the energy density, rate performance, cycle performance, high and low temperature performance and safety performance of the battery. [0003] In the existing lithium-ion batteries, graphite is the most widely used battery with the negative electrode system. However, graphite has poor compatibility with existing organic electrolyte systems due to its high degree of graphitization and a highly oriented layered structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 岳敏刘成陈春天闫慧青黄友元任建国
Owner BTR NEW MATERIAL GRP CO LTD
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