| abstract |
The present invention relates to a secondary battery and a secondary battery system, comprising: a liquid anode including a sodium-containing solution and a cathode current impregnated in the sodium-containing solution; A negative electrode part including a liquid organic electrolyte, a negative electrode current collector impregnated in the liquid organic electrolyte, and a negative electrode active material layer positioned on the surface of the negative electrode current collector; And a solid electrolyte disposed between the anode and the cathode. |