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Battery

<2017> Lithium Ion Battery Separator Technology Trend and Market Forecast
  • Publishing Date : 2016-12-22
  • Published cycle : Special
  • Page :  135p
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The global separator market has grown at a CAGR of 29.7% over last three years.

In recent years, the secondary battery market is extending into the ESS and EV market in the small IT application market, and demand for the secondary battery separator market is also expected to increase accordingly.

Asahi Kasei in Japan has been traditionally strong in lithium-ion secondary battery separator market, and it is expected to strengthen its influence due to the acquisition of Celgard (Polypore), which was ranked fifth in market share last year. Asahi Kasei is followed by SK Innovation in Korea, Toray, Ube, and Sumitomo in Japan. As the China battery market has grown, the market share of separator companies in China has increased as well.

 

Three countries such as Korea, China and Japan are leading the global separator market, and Japanese companies are coping with material superiority of China low price based on their advanced technology and patent advantages. SK Innovation and W-scope (foreign-funded companies) in Korea have been aggressively winning market share. The leading companies in secondary battery separator market are preparing for market demand growth through expanding production capacity.

 

In the lithium-ion secondary battery, separator materials are generally classified into wet and dry type. Asahi Kasei, Toray, and SK Innovation have mainly adopted the wet type. In contrast, Celgard, Ube have mainly adopted the dry type. In the meantime, separator of wet type has been widely used in the separator market for small IT devices. In case of separator of dry method, dry type has relatively better heat resistance than wet type. For this reason, recently a lot of secondary battery companies are currently reviewing dry type as automotive secondary battery separator. Therefore, demand is expected to increase. Additionally, it is expected to greatly increase demand for application of organic / inorganic / polymer coating separator, and composite separator into battery of the electronic car, where the safety is even more important instead of focusing on existing PE and PP when it comes to separator material. 

 

In this report, we have looked through the overall functions and technology of the separator that determines the safety of the lithium-ion secondary battery. Thus, the latest heat resistance separator and coating separator products that have newly emerged have been covered. In addition, it includes production status and patent status by separator companies, market status of separator products, and forecasts for future expected market.

 

< Key points of this report >

- Report - focus on overall separator technology

Development trends of latest separator (heat resistance separator, coating separator)

- Separator development trends of separator companies

- Separator market forecast and related patents




< Contents >

1. Introduction to separators for LIB.

2. Classification of separators

2.1. Microporous membranes

2.2. Nonwovens

2.3. Composite membranes

2.4. Ion exchange membranes

3. Separators for lithium-ion rechargeable batteries.

3.1. Separator preparation

3.1.1. Dry process

3.1.2. Wet Process

3.2. Separator properties 22

3.2.1. Thickness 22

3.2.2. Air permeability 22

3.2.3. Porosity / Pore size 23

3.2.4. Ionic conductivity 25

3.2.5. MacMullin number 25

3.2.6. Electrical/electrochemical stability 25

3.2.7. Oxidation stability 26

3.2.8. Wettability 26

3.2.9. Tensile strength 28

3.2.10. Puncture strength 28

3.2.11. Mix penetration strength 29

3.2.12. Thermal shrinkage 29

3.2.13. Mechanical integrity (or Melt-down) 33

3.2.14. Skew 34

3.2.15. Defects 35

3.2.16. Cell Assembly 35

3.3. Relationship between separators and cells 37

3.3.1. Cell performances 37

3.3.2. Cell safeties 39

4. Nonwoven separators 44

4.1. Nonwoven preparation 45

4.1.1. Dry-laid 47

4.1.2. Wet-laid 48

4.1.3. Spun-bond 50

4.1.4. Melt-blown 51

4.1.5. Web bonding 53

4.2. Nonwoven properties and cell application 57

5. Heat Resistant Separators 59

5.1. Multi-layer structure separators 60

5.2. Nonwoven separators 61

5.3. Inorganic-introduced high-stability separators 61

5.3.1. Non-aqueous inorganic coating separators 62

5.3.2. Aqueous inorganic coating separators 65

5.3.3. Binder-Free separators 66

5.4. Polymer coating separators 70

5.5. Coated separators incorporating heat-resistant and inorganic polymer 73

5.5.1. An inorganic coating separators using a heat resistant polymer as a binder 73

5.5.2. Inorganic / heat-resistant polymer coated separator 74

6. Recent developments in separators 76

6.1. Co-extrusion 77

6.2. Nonwovens 77

6.3. Inorganic composites 78

6.4. Surface modification 81

7. Leading manufactures of separators 83

7.1. Asahi Kasei 84

7.2. Toray (Exxon Mobil) 87

7.3. Celgard 90

7.4. SK Innovation 93

7.5. W-scope Korea 96

7.6. Ube 98

7.7. Senior 101

7.8. Teijin 104

7.9. Foshan Yingbolai 106

7.10. Cangzhou mingzhu (CZMZ) 109

7.11. Sumitomo 112

7.12. Entek 115

7.13. Manufactures of separators in China 117

7.14. Others 121

8. Patent regarding Separator Surface 123

9. MARKET TREND 127

9.1. Market Share of separator and production capacity forecast 127

9.2. Separator market forecast (2014~2020) 131

9.3. The forecast and present condition of cost 133

10. SUMMARY 134

11. REFERENCE LIST 135

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