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Sodium-ion battery

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Sodium-ion battery

Sodium-ion batteries are a type of reusable battery that uses sodium-ions as its charge carriers. The sodium salts used to prepare these battery materials are highly abundant, coming from more renewable sources than those of equivalent lithium salts, making them both cheap and easily obtainable. This type of battery is in a developmental phase, but may prove to be a cheaper way to store energy than commonly used lithium-ion batteries.[1] As of 2014, one company, Aquion Energy, has a commercially available sodium-ion battery with cost/kWh capacity similar to a nickel-iron battery. In addition UK-based Faradion has developed a wide range of novel, low-cost Sodium-ion materials, which are a drop-in replacement for established Lithium-ion technology and which they are now licensing.[2] Unlike sodium-sulfur batteries,[3] sodium ion batteries can be made portable and can function at room temperature (approx. 25˚C). Sodium-ion also offers enhanced safety and transportation features, particularly over lithium-ion.

Energy Storage

Like all batteries, the sodium ion battery stores energy in chemical bonds in its anode. When the battery is charging Na+ ions de-intercalate and migrate towards the anode. Meanwhile charge balancing electrons pass from the cathode through the external circuit containing the charger and into the anode of the battery. During discharge the process reverses. Once a circuit is completed electrons pass back from the anode to the cathode and the Na+ ions travel back to the cathode.[4] Sodium is much more abundant than the lithium that makes up 2013's highest performing rechargeable batteries,[1] creating the potential for lower cost solutions.

Sodium ion cells have been reported with a voltage of 3.6 volts, able to maintain 115 Ah/kg after 50 cycles, relating to a cathode-specific energy of approximately 400 Wh/kg[5] The demonstration of acceptable cycling performance will be necessary to establish non-aqueous Na-ion batteries as a credible alternative to commercial Li-ion cells. Data from Faradion have indicated a far better capacity fade performance in full Na-ion pouch cells using a layered oxide cathode material.[6]

Anode

Using NaxC6 as the anode, the average voltage on the low potential plateau was higher on Na cells compared to Li cells. Unlike traditional Li cells, which make use of an intercalated graphitic anode with a fully lithiated stoichiometry of LiC6, Na cells do not have that capability to reversibly bind graphite. This is in part due to the larger ionic radius of the Na+ ion compared to the Li+ ion, which renders the expansion of the graphite galleries unfavorable. For this reason, carbon based anodes rely on amorphous carbon consisting of spatially disoriented graphene sheets, defects, and interstitial pores. These amorphous types of carbon can be categorized into a dichotomy of hard and soft. Hard carbons cannot be transformed into graphite through annealing at high temperatures, while soft carbons can be. The hard carbon materials can be derived from a variety of feedstock such as: sugar, starch, fiber, and certain polymers.[7]

In addition to carbon anodes, alloying different types of anode with additives such as Antimony (Sb), Tin (Sn), Phosphorus (P), Germanium (Ge) and Lead (Pb) can also yield results. As opposed to carbon anodes, which merely provide organic complexes for the storage of Na+ ions, alloyed anodes form inorganic complexes with the Na+ ions such as Na3Sb, Na3Sn and Na3P. This capability gives alloying type anodes a much greater theoretical capacity that traditional carbon based ones. Whereas amorphous based carbon anodes have shown capacity between 300-400 mAh g−1, a Na3P anode has a theoretical capacity of 2596 mAh g−1. Though this capacity represents a large increase, alloying type anodes do have some other significant problem. The alloying process causes an extremely large volume change, sometimes nearing 400%, in the anode. This large volume change results in the fracturing and displacement of the alloying material which causes it to passivate and effectively be turned into 'dead weight', as it cannot restructure itself with sodium ions once it has been passivated. If left unchecked, these large volume changes are very detrimental to the cycle life of the battery. For this reason, much of the research conducted in the area of anode alloys focuses on mitigating the volume changes that happen upon sodiation, as well as reducing their negative effects.

Tin-coated wood anodes can replace stiff anode bases that are too brittle to withstand the swelling and shrinking that happens as ions move to and from the anode. Wood fibers are supple enough withstand more than 400 charging cycles. After hundreds of times, the wood ended up wrinkled but intact. Computer models showed that that the wrinkles effectively relax the stress in the battery during charging and recharging, so that the battery can survive many cycles. Na ions move via the fiberous cell walls and by diffusion at the tin (Sn) film surface.[8][9]

Cathode

Tests of Na2FePO4F and Li2FePO4F cathode materials indicated that the sodium iron phosphate cathode easily replaces a lithium iron phosphate in a Li cell.[5] The combined lithium-ion and sodium-ion make up would lower the overall price of the battery.[5]

The electrode material P2-Na2/3[FeMn1/2]O2 delivers 190  Ah/kg of reversible capacity in sodium cells using the electrochemically active Fe3+/Fe4+ redox at room temperature.[10] Triclinic Na2FeP2O7 has been examined as rechargeable sodium ion batteries by glass-ceramics method. The precursor glass, also made of Na2FeP2O7, was prepared by melt-quenching method. Na2FeP2O7 exhibits 2.9 V, 88 Ah/kg.[11]

Separately, chromium cathodes employed the reaction:

NaF + (1−x)VPO4 + xCrPO4 → NaV1−xCrxPO4F
These cathodes retained more capacity through cycles of charge and discharge. The effects of Cr doping on cathode performance materials was analyzed in terms of crystal structure, charge/discharge curves and cycle performance and indicated that the Cr-doped materials expressed better cycle stability. The initial reversible capacity was 83.3 Ah/kg and the first charge/discharge efficiency is about 90.3%. The reversible capacity retention of the material was 91.4% after the 20th cycles.[5][12]
Cathode materials The first charge capacity (Ah/kg) The first discharge capacity (Ah/kg) Capacity loss in the first cycle (Ah/kg) Reversible efficiency in the first cycle (%) The discharge capacity at the 20th (Ah/kg) The capacity retention ratio at the 20th (%)
NaV0.92Cr0.08PO4F 83.3 75.2 8.1 90.3 68.8 91.4
NaV0.96Cr0.04PO4F 93.3 82.6 10.7 88.5 67.9 82.2
NaVPO4F 106.9 87.7 19.2 82.0 64.5 73.5

Paper Electrode

An Indian-origin researcher has discovered a way to use MoS2/graphene composite paper as an electrode.[13][14][15]

See also

Aquion Energy

References

  1. ^ a b Kevin Bullis, "Sodium-Ion Cells for Cheap Energy Storage", Technology Review, Published by MIT,Wednesday December 2, 2009
  2. ^ "[1]"http://www.faradion.co.uk/products/sodium-technology/
  3. ^ "About Sodium-Sulfur (NaS) Batteries" The Energy Blog, January 18, 2006,
  4. ^ Steven S. Zumdahl "Chemical Principles, 6th Edition" Cengage Learning 2009 p.495
  5. ^ a b c d Ellis, B. L.; Makahnouk, W. R. M.; Makimura, Y.; Toghill, K.; Nazar, L. F. (2007). "A multifunctional 3.5V iron-based phosphate cathode for rechargeable batteries". Nature Materials 6 (10): 749–53.  
  6. ^ http://www.faradion.co.uk/wpcms/wp-content/uploads/2014/04/Faradion-Limited-Na-ion-Presentation-Website-Version.pdf. 
  7. ^ Stevens, D. A.; Dahn, J. R. (2000). "High Capacity Anode Materials for Rechargeable Sodium-Ion Batteries". Journal of The Electrochemical Society 147 (4): 1271–3.  
  8. ^ "A battery made of wood: long-lasting, efficient, environmentally friendly". KurzweilAI. Retrieved 2013-06-25. 
  9. ^ Zhu, H.; Jia, Z.; Chen, Y.; Weadock, N.; Wan, J.; Vaaland, O.; Han, X.; Li, T.; Hu, L. (2013). "Tin Anode for Sodium-Ion Batteries Using Natural Wood Fiber as a Mechanical Buffer and Electrolyte Reservoir". Nano Letters 13 (7): 3093–100.  
  10. ^ Yabuuchi, N.; Kajiyama, M.; Iwatate, J.; Nishikawa, H.; Hitomi, S.; Okuyama, R.; Usui, R.; Yamada, Y.; Komaba, S. (2012). "P2-type Nax[Fe1/2Mn1/2]O2 made from earth-abundant elements for rechargeable Na batteries". Nature Materials 11 (6): 512–7.  
  11. ^ Honma, T.; Togashi, T.; Ito, N.; Komatsu, T. (2012). glass-ceramics for sodium ion battery"7O2FeP2"Fabrication of Na (pdf). Journal of the Ceramic Society of Japan 120 (1404): 344–6.  
  12. ^ Zhuo, H.; Wang, X.; Tang, A.; Liu, Z.; Gamboa, S.; Sebastian, P. J. (2006). "The preparation of NaV1−xCrxPO4F cathode materials for sodium-ion battery". Journal of Power Sources 160 (1): 698–703.  
  13. ^ Indian-origin develops paper electrode for sodium-ion battery, The Economist Times, 30 January 2014
  14. ^ David, L.; Bhandavat, R.; Singh, G. (2014). "MoS2/Graphene Composite Paper for Sodium-Ion Battery Electrodes". ACS Nano 8 (2): 1759–70.  
  15. ^ Johnson, D. (31 Jan 2014). "Graphene Composite Offers Critical Fix for Sodium-ion Batteries". IEEE Spectrum Nanoclast. 
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